Medtronic Puritan Bennett 520 Service Manual
The Medtronic Puritan Bennett 520 is a ventilator designed for use by trained professionals. It offers a range of ventilation features, including volume target, leak compensation, and circuit detection and management. The device can be configured for invasive or non-invasive ventilation, allowing for various patient settings. Its safety features include alarms that alert users to potential issues, such as low oxygen levels or pressure problems. The 520 features an internal battery for portability and can be connected to a range of accessories.
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Service Manual Puritan Bennett 520 Ventilator TM Copyright information COVIDIEN, COVIDIEN with logo, the Covidien logo and positive results for life are U.S. and internationally registered trademarks of Covidien AG. All other brands are trademarks of a Covidien company. © 2012, 2014, 2015, 2017 Covidien. The information contained in this manual is the sole property of Covidien and may not be duplicated without permission. This manual may be revised or replaced by Covidien at any time and without notice. You should ensure that you have the most current applicable version of this manual; if in doubt, contact Covidien's Technical Support department or visit the Covidien product manual web page at: http://www.covidien.com/rms/sales-support/product-manuals While the information set forth herein is believed to be accurate, it is not a substitute for the exercise of professional judgment. The ventilator should be operated and serviced only by trained professionals. Covidien’s sole responsibility with respect to the ventilator, and its use, is as stated in the limited warranty provided. Nothing in this manual shall limit or restrict in any way Covidien’s right to revise or otherwise change or modify the equipment (including its software) described herein, without notice. In the absence of an express, written agreement to the contrary, Covidien has no obligation to furnish any such revisions, changes, or modifications to the owner or user of the equipment (including software changes) described herein. Preface About This Manual This manual provides information needed to service the Puritan Bennett™ 520 Ventilator. This manual is intended for use by factory-trained biomedical engineering technicians or personnel with equivalent experience and training in servicing this type of equipment. It is recommended that the user complete the Puritan Bennett™ 520 Ventilator training class. Note: This manual is written assuming English (US) language is selected in ventilator SETUP (Section 2.12). Ventilator messages will be different depending upon the language selected. While this manual covers the ventilator configurations currently supported by Covidien, it may not be all-inclusive and may not be applicable to your ventilator. You should ensure you have the most current applicable version of this manual; if in doubt, contact Puritan Bennett LLC or visit the Covidien product manual web page at: http://www.covidien.com/rms/sales-support/product-manuals. Contact your local representative for questions regarding the applicability of the information. Qualification of Personnel Installation and maintenance of the device must be made by authorized and trained personnel. In particular, training for the handling of products sensitive to electrostatic discharges must include the use of Electrostatic Discharge (ESD) protection devices and knowledge of the following symbol’s meaning: . Electromagnetic Susceptibility The Puritan Bennett™ 520 Ventilator complies with the requirements of IEC 60601-1-2:2007 (EMC Collateral Standard), including the E-field susceptibility requirements at a level of 10 volts per meter at frequencies up to 1 GHz, and 10 volts per meter at frequencies between 1 GHz and 2.5 GHz, and the ESD requirements of this standard. However, even at this level of device immunity, certain transmitting devices (cellular phones, walkie-talkies, cordless phones, paging transmitters, etc.) emit radio frequencies that could interrupt ventilator operation if located in a range too close to the ventilator. It is difficult to determine when the field strength of these devices becomes excessive. Practitioners should be aware that radio frequency emissions are additive, and that the ventilator must be located a sufficient distance from transmitting devices to avoid interruption. Do not operate or store the ventilator in the presence of strong electromagnetic fields such as a magnetic resonance imaging (MRI) environment. Chapter 4 describes possible ventilator alarms and what to do if they occur. Contact an authorized service representative or you local durable medical equipment (DME) representative in case of interrupted ventilator operation and before relocating any life support equipment. Service Manual P-1 Preface WARNING Accessory equipment connected to the power receptacle, analog, and digital interfaces must be certified according to IEC 60601-1. Furthermore, all configurations shall comply with the system standard IEC 60601-1-1. Any person who connects additional equipment to the power receptacle, signal input part, or signal output part of the Puritan Bennett™ 520 Ventilator configures a medical system, and is therefore responsible for ensuring that the system complies with the requirements of the system standard IEC 60601-1-1. If in doubt, consult Puritan Bennett Technical Support at 1.800.255.6774 or your local representative. Warranty Information regarding your product warranty is available from your sales representative or Covidien. Extended Service The Puritan Bennett™ 520 Ventilator offers extended service contracts/warranties for purchase when the ventilator is purchased. Please contact your local Covidien sales or service representative for additional information. Customer Assistance For online technical support, visit the SolvITSM Center Knowledge Base by clicking the link at www.medtronic.com/covidien/support/solvitcenter-knowledge-base/. Here, you will find answers to frequently asked questions about the Puritan Bennett™ 520 Ventilator, and other Puritan Bennett products 24 hours a day, 7 days a week. For troubleshooting help or to obtain service for your ventilator, call your local Puritan Bennett Technical Support center. If you require further assistance, contact your local Puritan Bennett representative. Year of Manufacture The year of manufacture for ventilators is indicated on the bottom of the ventilator as shown here. 2007 Manufacturer The manufacturer and authorized representative are shown below|. Covidien llc, 15 Hampshire Street, Mansfield, MA 02048 USA. Covidien lreland Limited, IDA Business & Technology Park, Tullamore. P-2 Service Manual Service Centers Service Centers The following table provides the addresses and phone numbers for the Covidien International Service Centers. Table 1-1. Covidien International Service Centers Covidien Argentina Covidien Asia Covidien Australia Vedia 3616 Singapore Regional Service Centre 52A Huntingwood Drive 15 Pioneer Hub, #06-04 Europaring F09402 Buenos Aires, Argentina Covidien Austria GmbH Campus21 Tel: 5411 4863 5300 Singapore 627753 Huntingwood, NSW 2148 Fax: 5411 4863 4142 Tel: 65 6578 5288 Australia A-2345 Österreich Fax: 65 6515 5260 Tel: +61 1800 350702 Tel: +43 1 20609 1143 Fax: +61 2967 18118 Fax: +43 1 20609 2457 Covidien Brazil Covidien Canada Covidien Chile 19600 Clark Graham Lo Boza 107 Pudahuel 2800 Mechelen Praça Agrícola La Paz Tristante, 121 Osasco – São Paulo / CEP 06276-035 Belgium São Paulo, SP Tel: +32 220 08260 Fax: +32 270 06690 Covidien Belgium BVBA/SPRL. Generaal De Wittelaan 9/5 Baie d'Urfe, QC, H9X 3R8 Brunn am Gebrige Santiago Canada Chile Brasil Tel:1 877 664 8926 (option 2) Tel: 562 2739 3000 Tel: +55 11 2187 6543 Fax: 1 514 695 7534 Fax: 562 783 3149 Fax: 5511 2187-6380 Covidien China Covidien Colombia Covidien Costa Rica Covidien ECE s.r.o. 1st Floor, Covidien Plaza, Building 14 Edificio Prados de la Morea Global Park, Parkway 50 organizační složka No. 99 Tian Zhou Rd Carretera Central Del Norte La Auroa de Heredia 40104 (Cra 7a)Kilometro 18, Costa Rica Tel: +420 241 095 735 Chia-Cundinamarca Tel: 506 2293 4854 Fax: +420 239 016 856 Bogota, Colombia Fax: 506 2239 9108 CAOHEJING High Tech Park Xu Hui District Shanghai 200233 P.R. China Tel: +86 400821-6699 Prosek, Prosecká 852/66 190 00 Praha 9 Tel: 571 668 3777 Fax: +86 2154 4511 18 Fax: 571 668 3777 ext. 181 Covidien Danmark A/S Covidien Deutschland GmbH Covidien ECE s.r.o. Covidien Finland Oy Galvaniho 7 / A Rahtitie 3 Langebrogade 6E, 4. sal 82104 Bratislava FI-01530 VANTAA 1411 København K Technisches Service Center Danmark Raffineriestr. 18 Tel: +45 43 68 21 71 93333Neustadt / Donau Fax:+45 43 31 48 99 Slovakia Finland Tel: +421 2 4821 4573 Tel: +358 9725 192 88 Fax: +421 2 4821 4501 Fax: +358 9725 192 89 Germany Tel: + 49 69 51 709670 Fax: + 49 69 29 9571608 Service Manual P-3 Preface Table 1-1. Covidien International Service Centers (Continued) Covidien France SAS Covidien Hong Kong Covidien India Covidien ECE s.r.o. Parc d’affaires Technopolis Unit 12 - 16, 18/F 10th Floor Building No 9B Magyarországi Fióktelepe Bat. Sigma, 3 Avenue du Canada Millennium City 5 DLF Cyber City Phase III Gurgaon Máriassy u.7 Haryana - 122002 Hungary India Tel: + 36 1 880 7975 Tel: + 91 1244 709800 Fax: + 36 1 778 9459 LP 851 Les Ulis 91975 Courtaboeuf Cedex France Tel: +33 1 57 32 35 10 Fax: +33 1 57 32 70 10 BEA Tower 4187 Kwun Tong Road Kwum Tong, Kowloon, Hong Kong Tel: + 852 2574 3251 Fax: + 852 2838 0749 1095 Budapest Fax: + 91 1244 206850 Covidien Ireland Covidien Israel Covidien Italia S.p.A Covidien Japan Inc. Block G, Ground Floor, 5, Shacham St. S. Bovio 3 Cherrywood Technology Park, North Industrial Park Technical Support Center PO Box 3069 20090 S. Felice di Segrate (MI) Loughlinstown Caesarea, Israel Italy 83-1, Takashimadaira 1Chome Dublin 18, Ireland 3088900 Tel: +353 0 1 4073173 Itabashi-ku, Tokyo 1750082 Tel: +972 4 6277388 Tel: +39 02 91483320 (option 3) Fax: +353 0 1 9075668 Fax: +39 02 91294863 Japan Fax:+972 4 6370053 Tel: +81 0 3 6859 0120 Fax: +81 0 3 6859 0142 Covidien Korea Covidien Mexico 5F, Hibrand Living Gwan, #215, Yangjae-Dong, Av. Insurgentes Sur 863, Pisos 15 y 16 Col. Nápoles Seocho-Gu Del. Benito Juarez Seoul, Korea Mexico, D.F. 03810 Mexico Tel: +822 6196 5459 Fax: +822 6196 5498 Tel: 5255 5804 1524 Covidien Nederland BV Covidien New Zealand Hogeweg 105 5301 LL Zaltbommel Cnr Manu Tapu Dr & Joseph Hammond Pl. Nederland Auckland Airport Tel: +31 202061470 New Zealand Fax: +31 707 709229 Tel: + 64 508 489 264 Covidien Portugal Lda. Fax: 5255 5536 1326 Covidien Norge AS Covidien Panama Covidien Polska Postboks 343 Parque Industrial Costa del Esta Al. Jerozolimskie 182 Calle Primera, Edifio # 109 Polska N-1372 Asker. Norway Tel: +47 2415 9887 Fax: +47 2302 4955 Panama City, Panama Tel: 507 264-7337 02-222 Warszawa Tel: +48 22 279 04 05 Fax: +48 22 279 04 03 Estrada do Outeiro de Polima, Lote 10, 1° Piso Abóboda 2785-521 S. Domingos de Rana Portugal Fax: 507 236-7408 Tel: +351 21 761 62 44 Fax: +351 800 781385 P-4 Covidien Puerto Rico Covidien Russia Covidien Saglik A.S. Covidien South Africa Palmas Industrial Park 53 bld. 5 Dubininskaya Corporate Park North Road 869 Km 2.0 Bdlg. #1 Street Moscow Maslak Mahallesi Bilim Sokak No: 5, Sun Plaza Kat: 2-3 Russia 119054 379 Roan Crescent Sisli, Istanbul 34398 Randjespark Midrand, South Africa Turkey Tel: +27 115 429 500 ext. 7222 & 7221 Tel: +90 212 366 20 00 Fax: +27 115 429 624 Fax: 787 993 7234 Fax: +90 212 276 35 25 Cataño, PR 00962 Tel: +70 495 933 64 69 Tel: 787 993 7250 Fax: +70 495 933 64 68 Service Manual Service Centers Table 1-1. Covidien International Service Centers (Continued) Covidien Spain S.L. Covidien Sverige AB Covidien Switzerland Covidien Thailand Servicio Técnico WTC Almeda Park Box 54 Roosstrasse 53 99 Soi Rubia 171 74 Solna Ch-8832 Wollerau Sukhumvit 42 Road Plaça de la Pau, S/N Edif. 7, 3a Planta 08940 Cornellá de Llobregat (Barcelona) Sweden Schweiz Tel: +46 8 517 615 73 Tel: +41 44 511 82 71 13-14 Fl., Berli Jucker Building Fax: + 46 8 502 521 10 Fax: +41 44 511 16 34 Prakanong, Klongtoney Spain Bangkok 10110, Thailand Tel: +34 91 275 48 54 (option 3) Tel: +66 2 207 3 100 Fax: +66 2 657 6325 Fax: +34 91 276 89 33 Covidien UK Covidien USA Unit 2, Talisman Business Park 2101 Faraday Ave London Road, Bicester OX26 6HR, United Kingdom Phone: 1 800 255 6774 (option 4) Carlsbad, CA 92008 Email: [email protected] Tel: +44 20 3027 1757 Fax: +44 20 3684 8869 Service Manual P-5 Preface This page intentionally blank P-6 Service Manual Contents 1 Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Qualification of Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electromagnetic Susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extended Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Customer Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Year of Manufacture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1 P-1 P-1 P-1 P-2 P-2 P-2 P-2 P-2 P-3 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1 1–1 1–1 1.1 1.2 2 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Range, Resolution, and Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compliance and Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.6.1 Manufacturer’s Declaration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tools, Equipment, and Service Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8.1 Preventive Maintenance Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controls, Indicators, and Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Symbols, Abbreviations, and Internal Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ventilator Serial Number and Software Versions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to Configure the Ventilator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 3.2 3.3 3.4 Service Manual Operational Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety Net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ventilator Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pneumatic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.1 Inlet Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.2 Low Pressure Oxygen Inlet/Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.3 Oxygen Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1 2–1 2–2 2–5 2–8 2–14 2–15 2–16 2–22 2–25 2–28 2–29 2–38 2–42 2–42 2–46 3–1 3–1 3–2 3–3 3–4 3–4 3–4 3–4 i Contents 3.5 3.6 4 3–4 3–5 3–5 3–5 3–6 3–7 3–7 3–7 3–7 3–7 3–7 3–8 3–9 3–9 3–9 3–10 3–10 3–11 3–11 3–12 3–12 3–13 3–13 3–13 3–13 3–14 3–14 3–14 3–14 3–15 3–15 3–15 3–15 3–15 3–16 3–16 3–16 3–17 Alarms and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1 4.1 4.2 4.3 ii 3.4.4 Inlet Silencer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.5 Turbine Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.6 Outlet Silencer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.7 Exhalation Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.8 Inspiratory Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.9 Inspiratory Flow Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.10 Proximal Pressure Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.11 Inspiratory Pressure Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.12 Exhalation Valve (Internal Valve) Pressure Sensor. . . . . . . . . . . . . . . . . . . . . . . 3.4.13 Barometric Pressure Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.14 Patient Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.1 Power Management PCBA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.2 AC to DC Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.3 DC Voltage Conversion and Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.4 Internal Battery Charging and Discharging . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.5 Power Source Priority and Switching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.6 USB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.7 Microcontroller Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.8 CPU PCBA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.9 Breath Delivery Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.10 LCD Panel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.11 Power Management PCBA Communication . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.12 Status and Error Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.13 Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.14 Turbine Control PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.15 Buzzer PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.16 Battery Connection PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.17 Internal Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.18 Ventilator Compartment Temperature Sensor. . . . . . . . . . . . . . . . . . . . . . . . 3.5.19 Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ventilation Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.1 Vt Target. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.2 Leak Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.3 Circuit Detection and Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.4 Relative or Absolute Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.5 Invasive or Non-invasive Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.6 FiO2 for Various Oxygen and Ventilator Settings. . . . . . . . . . . . . . . . . . . . . . Alarm Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to Respond to Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.1 How to Pause the Audible Portion of an Alarm . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.2 How to Pause an Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.3 How to Reactivate a Paused Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.4 Alarm Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to Access Stored Ventilator Diagnostic Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3.1 Alarm Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3.2 Technical Fault Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1 4–3 4–3 4–4 4–5 4–6 4–7 4–7 4–7 Service Manual Contents 4.3.3 Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.1 Troubleshooting Technical Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.2 Troubleshooting Ventilation Alarm Messages. . . . . . . . . . . . . . . . . . . . . . . . . 4.4.3 Troubleshooting Miscellaneous Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.4 PCBA Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9 4–9 4–10 4–12 4–33 4–34 Service and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1 5–1 5–2 5–2 5–3 5–3 5–3 5–4 5–4 5–4 5–4 5–5 5–9 5–9 5–9 5–10 5–12 5–13 5–14 5–17 5–17 5–19 5–20 5–24 5–26 5–28 5–29 5–31 5–33 5–34 5–36 5–37 5–39 5–39 5–40 5–44 5–45 5–46 4.4 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 6 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Cables and Pneumatic Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrostatic Discharge Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.1 ESD Procedures and Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacement Part Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Patient System and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6.1 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6.2 Labeling Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6.3 External Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6.4 Measurement Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6.5 Review Technical Fault Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ventilator Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.1 Inlet Air Filter Removal and Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.2 Power Switch Cover Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.3 Adhesive Feet Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.4 Battery Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.5 Housing Disassembly and Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.6 Carrying Handle Removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.7 Keypad Removal and Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.8 Exhalation Solenoid Valve Removal and Replacement . . . . . . . . . . . . . . . . 5.7.9 CPU PCBA Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.10 LCD Panel Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.11 3V Battery Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.12 Inspiratory Block Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.13 Buzzer PCBA Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.14 Oxygen Solenoid Valve Removal and Replacement . . . . . . . . . . . . . . . . . . . 5.7.15 Turbine Assembly Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . 5.7.16 Turbine Control PCBA Removal and Replacement . . . . . . . . . . . . . . . . . . . . 5.7.17 Turbine Foam Pads Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . 5.7.18 Power Management PCBA Removal and Replacement . . . . . . . . . . . . . . . . 5.7.19 Fan Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.20 Battery Connection PCBA Removal and Replacement . . . . . . . . . . . . . . . . . 5.7.21 Remote Alarm (Nurse Call) Cable Removal and Replacement . . . . . . . . . . 5.7.22 Oxygen Connector/Tube Assembly Removal and Replacement . . . . . . . 5.7.23 Lower Housing Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Post-ventilator Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1 6.2 Service Manual Test Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . When to Run Performance Verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1 6–1 6–2 iii Contents 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 6.14 6.15 6.16 6.17 7 Required Materials and Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3.1 PTS 2000 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Safety Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power-on Indicators Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ventilator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.1 Accessing the Setup Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.2 Change Language, Date, Time, or Other Settings . . . . . . . . . . . . . . . . . . . . . . . 6.6.3 Entering Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical Fault Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measurements Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.9.1 Patient Pressure Sensor Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.9.2 Exhalation Valve (Internal Valve) Pressure Sensor Calibration . . . . . . . . . 6.9.3 Inspiration Flow Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Flow Sensor Capacity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.10.1 Turbine Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.10.2 Oxygen Solenoid Functional Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Breath Delivery Accuracy Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.11.1 Test Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.11.2 Pediatric Pressure Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.11.3 Adult Pressure Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC/DC/Battery Power Switching Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alarms Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.14.1 AC Power Disconnection Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.14.2 Patient Disconnect Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.14.3 Power Off While Ventilating Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Set Default Parameters/Time & Date Verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clear Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset Patient Hours. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1 7.1 7.2 7.3 7.4 7.5 7.6 How to Use the Parts Lists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1 Major System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–2 Electrical System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–5 Pneumatic System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–7 Turbine Assembly Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9 Label Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–11 A Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A.1 iv 6–4 6–5 6–6 6–8 6–8 6–8 6–9 6–9 6–10 6–11 6–15 6–15 6–17 6–17 6–19 6–19 6–21 6–23 6–23 6–24 6–25 6–26 6–28 6–31 6–31 6–32 6–32 6–33 6–35 6–35 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1 A–1 Service Manual Figures Figure 2-1. Figure 2-2. Figure 2-3. Figure 2-4. Figure 2-5. Figure 2-6. Figure 2-7. Figure 2-8. Figure 2-9. Figure 2-10. Figure 3-1. Figure 3-2. Figure 3-3. Figure 4-1. Figure 4-2. Figure 4-3. Figure 4-4. Figure 4-5. Figure 4-6. Figure 5-1. Figure 5-2. Figure 5-3. Figure 5-4. Figure 5-5. Figure 5-6. Figure 5-7. Figure 5-8. Figure 5-9. Figure 5-10. Figure 5-11. Figure 5-12. Figure 5-13. Figure 5-14. Figure 5-15. Figure 5-16. Figure 5-17. Figure 5-18. Figure 5-19. Service Manual Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bottom View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Side View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Setup Screen . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance Screen on Puritan Bennett 520 Ventilator . . . . . . . . . . . . . . . Setup 2 Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhalation Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator with Single Limb Circuit . . . . . . . . . . . . . . . . FiO2 for Various Oxygen and Ventilator Settings . . . . . . . . . . . . . . . . . . . . . . Alarm display messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alarm Settings Menu During Audio Paused Period. . . . . . . . . . . . . . . . . . . . . Alarm Settings Menu During Alarm Paused Condition . . . . . . . . . . . . . . . . . Alarm Log Screen (with and without alarms in the log). . . . . . . . . . . . . . . . . Maintenance Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Faults Screen With No faults Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Selecting Measurement Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measurement Check Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Inlet Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Switch Cover, Spring, and Pin Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Switch Cover Spring Position Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing/Replacing the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disconnecting the Keypad Flex Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pneumatic Tubing Connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . CPU PCBA Cables and Tubes (top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CPU PCBA Tubing Connections (underside view) . . . . . . . . . . . . . . . . . . . . . Pneumatic Tubing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the LCD Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LCD Flex Circuit Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the 3V Battery (LCD panel removed) . . . . . . . . . . . . . . . . . . . . . . . Replacing the 3V Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installing the Inspiratory Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Buzzer PCBA and Cable Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–29 2–32 2–33 2–35 2–36 2–38 2–43 2–45 2–45 2–46 3–6 3–8 3–17 4–3 4–4 4–5 4–6 4–8 4–9 5–6 5–6 5–10 5–11 5–12 5–13 5–15 5–16 5–18 5–19 5–21 5–22 5–23 5–25 5–26 5–27 5–28 5–29 5–30 v Figures Figure 5-20. Figure 5-21. Figure 5-22. Figure 5-23. Figure 5-24. Figure 5-25. Figure 5-26. Figure 5-27. Figure 5-28. Figure 5-29. Figure 5-30. Figure 5-31. Figure 5-32. Figure 5-33. Figure 5-34. Figure 6-1. Figure 6-2. Figure 6-3. Figure 6-4. Figure 6-5. Figure 6-6. Figure 6-7. Figure 6-8. Figure 6-9. Figure 6-10. Figure 6-11. Figure 6-12. Figure 6-13. Figure 6-14. Figure 6-15. Figure 6-16. Figure 7-1. Figure 7-2. Figure 7-3. Figure 7-4. Figure 7-5. Figure 7-6. Figure 7-7. Figure A-1. Figure A-2. Figure A-3. vi How to properly set the Buzzer PCBA switch (underside of PCBA shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oxygen Valve Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Management/ Turbine Control Cable Detail. . . . . . . . . . . . . . . . . . . . Turbine Control PCBA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Turbine support pad detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Upper Turbine Pad Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Management PCBA Mounting Screw Locations . . . . . . . . . . . . . . . . Fan Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Battery Connection PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Alarm Cable and Oxygen Tubing Detail . . . . . . . . . . . . . . . . . . . . . . Remote Alarm Harness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aligning the Tab on the Harness Connector With the Notch on the Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Orientation of the Connector and Tightening Locking Nut . . . . . . . . . . . . Remote Alarm Harness Installed Into Ferrite . . . . . . . . . . . . . . . . . . . . . . . . . . Oxygen Connector Properly Oriented . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PTS 2000 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setup Screen on Puritan Bennett 520 Ventilator . . . . . . . . . . . . . . . . . . . . . . . Maintenance Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measurements Check Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pressure Sensor Calibration Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inspiration Flow Calibration Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Setup for Turbine Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Expected Turbine Performance Test Patient Pressure Reading. . . . . . . . . Oxygen Solenoid Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pediatric Pressure Test Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adult Pressure Accuracy Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Switching Test Setup (rear view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Switching Test Setup (front view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Alarm Test Setup (front view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Alarm Test Box Connected to Ventilator (rear view) . . . . . . . . . . . Remote Alarm Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Major System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Major Electrical Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pneumatic Components and Connection Diagram. . . . . . . . . . . . . . . . . . . . . Turbine Assembly Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Panel Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear Panel Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bottom Panel Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pneumatic Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Management PCBA Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhalation Solenoid Valve During Inspiration And Exhalation . . . . . . . . . . 5–31 5–32 5–33 5–35 5–36 5–37 5–38 5–39 5–40 5–41 5–41 5–42 5–42 5–44 5–45 6–5 6–9 6–10 6–11 6–16 6–17 6–20 6–21 6–21 6–24 6–25 6–27 6–27 6–29 6–29 6–30 7–4 7–6 7–8 7–10 7–12 7–13 7–14 A–1 A–2 A–3 Service Manual Tables Table 1-1. Table 2-1. Table 2-2. Table 2-3. Table 2-4. Table 2-5. Table 2-6. Table 2-7. Table 2-8. Table 2-9. Table 2-10. Table 2-11. Table 2-12. Table 2-13. Table 2-14. Table 2-15. Table 2-16. Table 2-17. Table 2-18. Table 2-19. Table 2-20. Table 2-21. Table 2-22. Table 3-1. Table 3-2. Table 4-1. Table 4-2. Table 4-3. Table 4-4. Table 5-1. Table 5-2. Table 6-1. Table 6-2. Table 6-3. Table 6-4. Table 6-5. Table 6-6. Service Manual Covidien International Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . Consumable Parts for the Puritan Bennett 520 Ventilator . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Range, Resolution, and Accuracy . . . . . . . Default Puritan Bennett 520 Ventilator Settings. . . . . . . . . . . . . . . . . . . . . . . Default Puritan Bennett 520 Ventilator Alarm Settings . . . . . . . . . . . . . . . . Default Puritan Bennett 520 Ventilator Preferences (after software download) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ventilator Compliance with Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electromagnetic Emissions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electromagnetic Immunity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electromagnetic Immunity — Conducted and Radiated RF. . . . . . . . . . . . Recommended separation distances Between Portable and Mobile RF Communications Equipment and the Puritan Bennett 520 Ventilator . . Compliant Cables and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tools, Equipment, and Service Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preventive Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preventive Maintenance Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Control Panel Keys and Indicators . . . . . Puritan Bennett 520 Ventilator Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Rear Panel Labels and Markings . . . . . . . Puritan Bennett 520 Ventilator Bottom Panel . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator Side Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . Puritan Bennett 520 Ventilator On-screen Symbols, Abbreviations, and Internal Labels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pneumatic Component Operating Ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power source Switching Priority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alarm Priority Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical Fault Error Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . Ventilation Alarm Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . Miscellaneous Symptom Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . Specifications for Measurement Check Verification . . . . . . . . . . . . . . . . . . . . Testing and Calibration Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Testing and Calibration Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Safety Test Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measurements Check Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Default Ventilator Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Default Alarm Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Default Preferences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 2–2 2–4 2–5 2–9 2–14 2–14 2–14 2–15 2–17 2–18 2–19 2–21 2–22 2–23 2–26 2–28 2–29 2–32 2–33 2–37 2–38 2–39 3–4 3–11 4–2 4–10 4–13 4–33 5–7 5–46 6–2 6–6 6–12 6–34 6–34 6–34 vii Tables Table 7-1. Table 7-2. Table 7-3. Table 7-4. Table 7-5. Table 7-6. Table 7-7. Table 7-8. Table 7-9. viii Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Major System Component Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical system component part numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . Pneumatic System Component Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . Turbine Assembly Component Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . Label Kit, P/N10000561 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Panel Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear Panel Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bottom Panel Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1 7–2 7–5 7–7 7–9 7–11 7–12 7–13 7–14 Service Manual 1 Safety Information 1.1 Definitions This manual uses three indicators to highlight critical information: Warning, Caution, and Note. They are defined as follows: WARNING Indicates a condition that can endanger the patient or the ventilator operator. Caution Indicates a condition that can damage the equipment. Note: Indicates points of particular emphasis, that make operation of the ventilator more efficient or convenient. Please take the time to familiarize yourself with the following caveats as they cover safety considerations, special handling requirements, and regulations that govern the use of the Puritan Bennett™ 520 Ventilator. 1.2 Warnings General Warnings • Not all clinical warnings are included in this service manual. The service manual is not intended for clinical use. Please consult the Puritan Bennett 520 Ventilator Clinician’s Manual for clinicalrelated warnings. Fire Hazard Warnings • To avoid a fire hazard, keep matches, lighted cigarettes, and all other sources of ignition (e.g., flammable anesthetics and/or heaters) away from the ventilator and oxygen hoses. • In case of fire or a burning smell, immediately disconnect the ventilator from the oxygen supply, facility power, and battery. In the event of an oxygen leak, shut down the supply of oxygen at its source. In addition, remove and/or keep any incandescent source away from the device, which may be enriched with oxygen. Circulate fresh air into the room to reduce the oxygen concentration level. 1-1 Safety Information • Do not use oxygen hoses that are worn, frayed, or contaminated by combustible materials such as grease or oils. (Textiles, oils, and other combustibles are easily ignited and burn with great intensity in air enriched with oxygen.) • • The ventilator must not be used with flammable anesthetic substances. Never expose any batteries to direct flame. Warnings for General Repair Safety 1-2 • To ensure proper servicing and avoid the possibility of physical injury, only qualified personnel should attempt to service or make authorized modifications to the ventilator. • To avoid an electrical shock hazard while servicing the ventilator, be sure to remove all power to the ventilator by disconnecting the power source and turning off all ventilator power switches before servicing. Follow accepted safety practices for electrical equipment when testing or making equipment adjustment, or repairs. • When replacing the ventilator's internal battery, the ventilator must be disconnected from all external power supplies and turned off. • When servicing the ventilator, be sure to familiarize yourself with, and adhere to all posted and stated safety warning and caution labels on the ventilator and its components, and on any service equipment and materials used. Failure to adhere to such warnings and cautions at all times may result in injury or property damage. • To prevent personal injury or death, do not attempt any ventilator service while a patient, or other person, is connected to the ventilator. • Never touch the ventilator's internal components, including the battery, and the patient simultaneously. • To ensure proper performance of the ventilator, follow the preventive maintenance schedule listed in Table 2-15. • To prevent possible personal injury, always disconnect the oxygen source from the ventilator before service. • Use all cleaning solutions and products with caution. Read and follow the instructions associated with the cleaning solutions you use to clean your ventilator. Use only those solutions listed in Table 2-14. • Do not clean any gas pathway with a liquid cleaner. Refer to Table 2-14 for allowable cleaning and disinfecting agents for use on other parts of the ventilator. • Use personal protective equipment whenever exposure to toxic fumes, vapor, dust particles, blood pathogens, and other transmittable diseases and hazardous material can be expected. If in doubt, consult an environmental health and safety specialist or an industrial hygienist before servicing the ventilator. Refer to Section 5.6.1 for cleaning procedure. • Chemicals from a broken LCD panel are toxic when ingested. Use caution when handling a ventilator with a broken display panel. • To prevent possible damage to the power supply, remove the battery from the ventilator (Section 5.7.4) during disassembly and reassembly. Service Manual Safety Information Warnings about Reducing Infection • To reduce the risk of infection, wash your hands thoroughly before and after handling the ventilator or its accessories. • Dirty or contaminated equipment is a potential source of infection. Clean the ventilator and its accessories regularly and systematically before and after each use and following any maintenance procedure to reduce the risks of infection. The use of a bacteria filter at the ventilator's inlet is recommended. Refer to the “Cleaning” chapter in the Clinician’s manual. • When handling any part of the ventilator, always follow appropriate infection control guidelines for handling infectious material. • Covidien recognizes that cleaning, sterilization, sanitation, and disinfection practices vary widely among healthcare institutions. It is not possible for Covidien to specify or require specific practices that will meet all needs, or to be responsible for the effectiveness of cleaning, sterilization, and other practices carried out in the patient care setting. • Covidien recommends that users of its products that require cleaning and sterilization/ disinfection consider the National Standards and Recommended Practices for Sterilization published by the Association for the Advancement of Medical Instrumentation (AAMI), as well as the following Center for Disease Control (CDC) publications: Guidelines for Maintenance of In-use Respiratory Therapy Equipment and Guidelines for Prevention of Nosocomial Pneumonia. Warnings Before Using Equipment • • The Puritan Bennett 520 Ventilator is not intended for ventilator-dependent patients. • Ensure the Intentional Vent Stop alarm is set to YES in the Preferences menu to enable alarm tones and an alarm message if the ventilator is voluntarily turned off. If the Intentional Vent Stop alarm is set to OFF, an alarm will not sound, nor will a message appear when the ventilator is turned off in the normal manner. • For a thorough understanding of ventilator operations, be sure to thoroughly read this manual and the Clinician’s manual before attempting to use the ventilator. • • The ventilator must be used only under the responsibility and on the prescription of a doctor. • • • Before activating any part of the ventilator, be sure to check the equipment for proper operation. • • Service Manual Ensure the Apnea Alarm is set to YES in the Preferences menu to enable an alarm tone if apnea occurs. If Apnea Alarm is set to OFF, the ventilator will still supply a backup rate during apnea conditions, but no alarm tone will sound. Check the ventilator periodically as outlined in this manual; do not use if defective. Immediately replace parts that are broken, missing, obviously worn, distorted, or contaminated. To prevent patient injury, do not use a ventilator if it requires repair. If the ventilator is damaged or its external housing is not correctly closed or it behaves in a way that is not described in this manual (excessive noise, heat emission, unusual odor, alarms not triggered during the start-up procedure), the oxygen and power supplies should be disconnected and use of the device stopped immediately. Verify the functionality of the alarms before making ventilator available for patient use. Do not perform ventilator alarm tests while the patient is connected to the ventilator. 1-3 Safety Information • If the ventilator fails any alarm tests, refer to Chapter 5 to service appropriate components. Refer to Table 4-3 to troubleshoot specific alarm messages. • Do not start ventilation until you ensure the device is correctly assembled, the inlet air filter is properly installed and unobstructed, and there is proper clearance all around the unit. Also ensure the patient circuit is correctly connected to both the ventilator and the patient, and the patient circuit, including all hoses, is not damaged or obstructed. • To minimize the risk of damage, you must use the ventilator's factory approved packaging to transport the ventilator. • • • Do not use the ventilator without a properly installed inlet air filter or with a dirty inlet air filter. • The inlet air filter is not reusable. Do not attempt to wash, clean, or reuse it. If you cannot determine the cause of a problem with the ventilator, contact Covidien Technical Support or your local representative. Do not use the ventilator on a patient until the problem has been corrected. To avoid injury and/or possible damage to the ventilator: before using the ventilator, use a flow meter (flow regulator) to regulate the oxygen supply to specifications before connecting the ventilator to the oxygen supply. General Warnings Regarding Use of Equipment 1-4 • • The ventilator must be used only under the responsibility and on the prescription of a doctor. • An alternative source of ventilation should always be available when using the Puritan Bennett 520 Ventilator. • Handle the ventilator with care during and after use, particularly when ambient temperatures are high. Some ventilator surfaces may become hot, even if safety specifications are not exceeded. • • Do not use sharp objects to make selections on the keyboard. • Use all cleaning solutions and products with caution. Read and follow the instructions associated with the cleaning solutions you use to clean your ventilator. Use only those solutions listed in Table 2-14. • The SET UP menu is only accessible if ventilation is stopped and the ventilator is powered on while the ALARM CONTROL key is pressed. • A continuous alarm condition will be activated if the ventilator power is switched off during ventilation. When the power is switched back on, ventilation will resume without having to press the ventilator’s ON/OFF key. Patients on mechanical ventilation should be appropriately monitored by competent medical personnel and suitable monitoring devices. Do not clean any gas pathway (including the patient circuit) with a liquid cleaner. Refer to Table 2-14 for allowable cleaning and disinfecting agents for use on other parts of the ventilator. Service Manual Safety Information Service Manual • Even though the Puritan Bennett 520 Ventilator meets current safety standards and although the internal Lithium-ion battery of the device is considered to be Dangerous Goods for transport in commerce, this device’s lithium battery is below the 100 Wh threshold and is therefore excepted from being a Class 9 – Miscellaneous- Dangerous Goods (DG). As such, the Puritan Bennett 520 Ventilator and/or the associated Lithium-ion battery are subject to some transport conditions under the Dangerous Goods Regulation for air transport (IATA: International Air Transport Association), International Maritime Dangerous Goods code for sea and the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) for Europe. Private individuals who transport the device are excluded from these regulations although for air transport some requirements apply. For air transport; the Puritan Bennett 520 Ventilator is permitted as checked-in or carry-on baggage. Spare batteries may be taken on board as carry-on luggage only. This classification and regulatory requirements may vary depending upon the country and mode of transport. Therefore it is recommended that users verify with the carrier / airline as to which measures to take before the voyage. • To ensure correct and lasting operation of the device, ensure the ventilator is installed and operated in the environmental conditions recommended in Appendix B, “Specifications” of the Clinician’s manual. • To ensure correct and lasting operation of the ventilator, ensure its air circulation holes (main inlet or cooling) are never obstructed. Place the device in an area where air can freely circulate around the ventilator and avoid installing it near floating fabrics, such as curtains. • The ventilator should never be immersed in any liquid, and any liquid on the surface of the device should be wiped away immediately. • If the ventilator has been transported or stored at a temperature that differs more than 20 °C ( 68 °F) from the temperature in which it will be operating, the ventilator should be allowed to stabilize in its operating environment for at least two (2) hours prior to use. • If the ambient temperature is above 104 °F (40 °C), the battery's thermal cut-off circuit may prevent the battery from recharging fully-even if the INTERNAL BAT charging indicator indicates the battery is completely recharged. • The default setting for altitude compensation is YES. Altitude compensation should always be set to YES for accurate volume delivery calculations at all elevations. • If the ventilator is damaged or its external housing is not correctly closed or it behaves in a way that is not described in this manual (excessive noise, heat emission, unusual odor, alarms not triggered during the start-up procedure), the oxygen and power supplies should be disconnected and use of the device stopped immediately. • Do not operate the ventilator in direct sunlight, near heat sources, outdoors, or near installations where liquid may pose a risk without first providing adequate protection for the device. • Avoid using the ventilator, if possible, in dusty environments. Dusty environments may require more vigilant monitoring, cleaning, and/or replacement of air intake and other filters. • Ensure the ventilator’s immediate surroundings allow for the proper operational connection of the device without folding, pinching, or damaging any of the required cables or tubes and the connection of the patient circuit to the patient provides for a secure comfortable fit. • Alarm volume should be adjusted with respect to the ventilator’s operating environment and so that the patient’s caretakers can hear the alarms. The audible alarm vents located at the front of the device should never be obstructed. 1-5 Safety Information • Before starting ventilation, ensure the device is properly assembled, and that the air inlet, cooling vents, and alarm sound diffusion holes are not obstructed. Ensure also that the patient circuit is of the proper configuration, properly connected to the ventilator, and that the circuit hoses are neither damaged or compressed and contain no obstructions or foreign bodies. Warnings Regarding the Environment • For environmental protection, the ventilator and its components, whatever their respective conditions of operation, cannot be disposed of with household waste and must be submitted for suitable selective collection and possible recycling. Observe all applicable regulations when disposing of the ventilator and any of its components. • Follow local governing ordinances and recycling regulations regarding disposal or recycling of batteries and other device components. Warnings Regarding Hoses and Accessories • The ventilator must not use, nor be connected to, any anti-static or electrically conductive hoses, tubing, or conduits. • Resistance of the exhalation valve and accessories (water traps, filters, etc.) must be as low as possible. • The exhalation valve must allow rapid discharge of the circuit pressure. Ensure the exhalation valve is always clean and its evacuation aperture (exhaust port) is never obstructed. • Never use a ventilator or any components or accessories that appear to be damaged. If any signs of damage are evident, contact your equipment supplier or Covidien. • After assembling, cleaning, or reassembling the patient circuit, inspect the hoses and other components to ensure there are no cracks or leaks and that all connections are secure. • The hose connecting the ventilator to the oxygen source must be designed exclusively for use with medical-grade oxygen. Under no circumstances should the oxygen hose be modified by the user. In addition, the hose must be installed without the use of lubricants. Warnings Regarding Electrical Power 1-6 • The maximum recommended shelf life of the internal battery is two (2) years. Do not use a battery that has been stored for two years prior to its first use. • Periodic recharging is important to help maximize useful life of the battery. Do not store the internal battery for extended periods, without recharging, as this may reduce the maximum life. • Due to typical voltage fluctuations that occur during normal power wheelchair use, the wheelchair mains battery should never be used to power the Puritan Bennett 520 Ventilator, nor should the ventilator’s battery be used to power the wheelchair. The ventilator should always be connected to an independent power source (e.g. AC power, extra batteries, or DC power source). • For the AC (“mains”) power cable to be properly secured, the attachment located on the power cable must be fitted into the power cable holder incorporated in the battery access cover and located under the AC (mains) power socket. • The power supply to which the ventilator is connected (both AC and DC) must comply with all applicable standards and provide electrical power corresponding to the voltage characteristics inscribed on the rear of the ventilator and in Table 2-3 to ensure correct operation. Service Manual Safety Information • After replacing the ventilator's internal battery, push on the battery's cover from the rear towards the front to take pressure off the cover mounting brackets, thereby avoiding breakage when the screws are tightened. • • • Do not leave power cables lying on the ground where they may pose a hazard. • To connect the ventilator to an external power source, first ensure the ventilator’s I/O switch is off (O). Then, connect the desired power cable to the ventilator. Finally, connect the power cable to the external power source. • To disconnect the ventilator from an external power source, first power-down the ventilator. Then, disconnect the power cable from the external power source and, finally, the ventilator. Before cleaning the ventilator, first disconnect the ventilator and the patient circuit. Ensure that the AC power cable is in perfect condition and not compressed. The device should not be turned on if the AC power cable is damaged. Warnings Regarding Oxygen • Strictly follow the instructions provided in the Clinician’s manual for connecting the oxygen supply, which include the use of a flow regulator and special coupler. • • The oxygen supply must be regulated using a flow meter connected to the source gas outlet. • Before connecting the oxygen supply, ensure the stud on the oxygen connector is protruding outward. • Inspect the oxygen connector before use to ensure its o-ring is attached and in good condition. Do not use an oxygen connector with a missing, worn, or damaged o-ring. • In the event of an oxygen leak, shut down the supply of oxygen at its source. In addition, remove and/or keep any incandescent source away from the device, which may be enriched with oxygen. Circulate fresh air into the affected room to bring the oxygen level down to normal. • To ensure stability, when the Puritan Bennett 520 Ventilator is mounted on a cart, the weight of the oxygen bottle should not exceed 14 kg (30 lb). • Ensure the oxygen supply pressure to the machine never exceeds 7 psi (50 kPa) or a flow of 15 lpm. • The hose connecting the ventilator to the oxygen source must be designed exclusively for use with medical-grade oxygen. Under no circumstances should the oxygen hose be modified by the user. In addition, the hose must be installed without the use of lubricants. • Ensure the only gas supplied to the ventilator through the dedicated oxygen supply connector is medical-grade oxygen. The oxygen supply must be shut off when ventilation is off. Before disconnecting the oxygen hose, allow the ventilator to continue for a few cycles without oxygen to flush the patient circuit of excess oxygen. Warnings Regarding USB Memory Device • Service Manual Always verify that the serial number of the ventilator is correctly associated with the correct patient before using a USB memory device to transfer data between the ventilator and a PC. 1-7 Safety Information This page intentionally blank 1-8 Service Manual 2 General Information This manual provides information needed to service the Puritan Bennett™ 520 Ventilator. It is intended for use by biomedical engineering technicians or personnel with equivalent experience who have successfully completed Covidien training on this product. This chapter provides introductory information on the Puritan Bennett 520 Ventilator, including: • • • • 2.1 a description of the ventilator, its accessories, and its controls and indicators a preventive maintenance schedule detailed specifications and required and test equipment used for service and repair an outline of the service philosophy. About This Manual COVIDIEN recommends that you become familiar with this manual and the Puritan Bennett 520 Ventilator Clinician’s Manual (for patient circuit setup, operation, and breath delivery information) before attempting to operate or maintain the ventilator. This manual is intended to be a comprehensive guide for servicing the Puritan Bennett 520 Ventilator. Chapter 1 provides safety information. Chapter 2 provides general information as described above. Chapter 3 describes the ventilator’s technical operating theory. Chapter 4 contains alarm, diagnostic, and troubleshooting information, and suggests which components to replace based upon troubleshooting results. Chapter 5 describes pre-service checks and provides step-by-step instructions for disassembling the ventilator, replacing components or assemblies, and reassembling the ventilator. Chapter 6 defines required performance verification tests. Chapter 7 contains parts lists and detailed assembly drawings for ordering replacement parts. 2-1 General Information 2.2 Product Description The Puritan Bennett 520 Ventilator is indicated for the mechanical ventilatory support of patients weighing at least 5 kg (11 lb). It is not intended for ventilator-dependent patients. The servicing of the ventilator is intended to be performed by qualified, trained personnel. The ventilator is applicable for adult and pediatric patients who require the following general types of ventilatory support, as prescribed by an attending physician: • Positive Pressure ventilation • Assist/Control or CPAP modes of ventilation • Pressure Control and Pressure Support (ST) breath types The ventilator is suitable for use in institutional, home, and portable settings. It is not intended for use as an emergency transport ventilator. The Puritan Bennett 520 Ventilator is a microprocessor-controlled ventilator consisting of a low-inertia micro turbine (blower) used for flow generation. A three-way solenoid valve is used to pilot an exhalation valve in the patient circuit. Flow and pressure sensors provide information to a CPU which uses software algorithms to provide closed-loop feedback control for breath delivery. An internal fan provides controlled cooling for electronic and pneumatic ventilator components. The ventilator can be powered via external AC power, an external DC power source, or an internal battery during situations where there is a loss or absence of external power. A power management PCBA determines which power source (AC mains, external DC power source, or internal battery) is the primary supply depending on the availability of each source. Servicing of the ventilator is intended to be performed by qualified, trained personnel and its use is applicable for adult and pediatric patients. Table 2-1 provides a list of accessories that are available for the Puritan Bennett 520 Ventilator. To order parts or accessories, contact your equipment supplier or COVIDIEN representative. WARNING Use only accessories recommended by Covidien. Note: The Puritan Bennett 520 Ventilator is shipped with the following items: clinician’s manual on CD-ROM (multi-language), one set of six (6) inlet air filters, carrying bag, one O2 inlet connector, European power cable, and an adult, single-limb breathing circuit. Table 2-2 lists available breathing circuits and other consumable items. Table 2-1. Puritan Bennett 520 Ventilator Accessories Description 2-2 Part number Carrying bag 3829000 Oxygen inlet connector (x10) 2962799 Carrying belt 3819100 Service Manual General Information Table 2-1. Puritan Bennett 520 Ventilator Accessories (continued) Description Part number Suspension belt 3819200 Backpack, padded suspenders 3819300 Backpack, padded suspenders, Pink 3819300P Dual Bag, Pink 2967200P Dual Bag; includes: 2967200 • • • Backpack padded suspenders, 2 ea. (3819300) Suspension belt (3819200) Carrying belt (3819100) DC power source (external battery, Puritan Bennett™ 500 Series Ventilator Power Pack), includes interconnect cable 4098100 AC (mains) power cable assembly, Australia 2981499 AC (mains) power cable assembly, Canada 2977099 AC (mains) power cable assembly, UK 2971899 AC (mains) power cable assembly, Japan 2972099 AC (mains) power cable assembly, China 2972399 AC (mains) power cable assembly, SAF/India 2972499 AC (mains) power cable assembly, EU 2971799 AC (mains) power cable assembly, Latin America various, contact your local representative 12 V cable (for connection to automobile DC power port) 10094625 RA II, with 1/4-inch jack connector: • • Remote alarm cable, NO (normally open) Remote alarm cable, NC (normally closed) 10003919 10094353 RA II, without 1/4-inch jack connector: • • Service Manual Remote alarm cable, RA Remote alarm cable, RA II 10094626 10000914 USB cable, mini B 10094627 or equivalent Utility Cart 4096800 2-3 General Information Table 2-2. Consumable Parts for the Puritan Bennett 520 Ventilator Description Inlet air combi filter, fine (pack of 6) Part number 10028771 Inspiratory bacteria filter: Barrierbac S Barrierbac S Angled Hygrobac Hygrobac S Hygrobac S Angled Hygroboy Hygroster Hygroster Mini Sterivent Sterivent S Sterivent Mini* 350U5879 350U19006 352U5805 352U5877 352U5996 355U5430 354U5876 354U19028 351U5410 351U5878 351U5979 Single-limb patient circuit with exhalation valve, 180 cm, PVC, non-sterile, ADULT 5093600 Single-limb patient circuit with exhalation valve, 180 cm, PVC, non-sterile, PEDIATRIC 5093500 Single-limb patient circuit without exhalation valve, 180 cm, PVC, non-sterile, ADULT 5093300 Single-limb patient circuit without exhalation valve, 180 cm, PVC, non-sterile, PEDIATRIC 5093100 *Do not use Sterivent Mini filters to test or calibrate the ventilator 2-4 Service Manual General Information 2.3 Specifications Table 2-3 lists the Puritan Bennett™ 520 Ventilator technical specifications. Table 2-3. Puritan Bennett 520 Ventilator Specifications Physical characteristics Weight 9.9 lb (4.5 kg) Dimensions (excluding accessories) 9.3 in wide x 12.4 in deep x 6.0 in high Connectors Inspiratory limb connector: ISO 22 mm (OD) 15 mm (ID) conical (235 mm wide x 315 mm deep x 154 mm high) Oxygen inlet: female connector with valve Exhalation pilot port: accommodates 3.2 mm to 4 mm ID tubing Proximal pressure port: accommodates 5 mm to 6 mm ID tubing Environmental requirements Temperature Operating: 5º to 40º C (41º to 104º F) 20 minutes after conditioning at 23o C Storage: -40º to 70º C (-40º to 158º F) Atmospheric pressure Operating: 450 to 825 mmHg (600 to 1100 hPa; 8.7 to 15.9 psi) Storage: 375 to 825 mmHg (500 to 1100 hPa; 7.3 to 15.9 psi) Altitude Operating/storage: -500 ft to 13,000 ft (-152 m to 3962 m) Humidity Operating/storage: 10% to 95% RH noncondensing Combination temperature and humidity Operating: 113º F (45º C) and 75% RH DC voltage supply -10% to +10% of nominal (12-30 V DC) Pneumatic specifications Turbine Maximum flow: 240 lpm at 24 cmH2O ± 1% Oxygen inlet Pressure: 7 psi max (50 kPa) Maximum pressure: 70 cmH2O at 0 lpm Flow: 15 lpm max Electrical specifications AC input 100 V AC – 240 V AC nominal (84 V AC – 264 V AC) 50 Hz – 60 Hz nominal (47 Hz – 63 Hz) 180 VA max 430 BTUs per hour DC supply Service Manual 12 V DC ± 10%, 8.3 A to 30 V DC ± 10%, 3.3 A max 2-5 General Information Table 2-3. Puritan Bennett 520 Ventilator Specifications (continued) Internal battery (Puritan Bennett 520 Ventilator) Lithium ion 26 V DC (nominal), 2.4 Ah full load capacity Charging current: Standby ventilation: 1.5 A/h (duration: < 6 h) During ventilation: 0.5 A/h (duration: <13 h) Average operating time (- 10%) at 25 ºC (± 5 ºC) with a fully charged battery with less than 50 charge/discharge cycles at the following ventilator settings: 5 h when Vt = 200 mL (± 5 mL), Pi = 10 cmH2O (± 2 cmH2O), Rtot = 20 bpm 4 h when Vt = 300 mL (± 5 mL), Pi = 20 cmH2O (± 2 cmH2O), Rtot = 15 bpm 3 h when Vt = 500 mL (± 5 mL), Pi = 30 cmH2O (± 2 cmH2O), Rtot = 15 bpm 2 h when Vt = 750 mL (± 5 mL), Pi = 45 cmH2O (± 2 cmH2O), Rtot = 20 bpm Shelf life: Installed in ventilator (without recharging): 6 months Not installed in ventilator (spare battery): 24 months WARNING Even though the Puritan Bennett 520 Ventilator meets current safety standards and although the internal Lithium-ion battery of the device is considered to be Dangerous Goods for transport in commerce, this device’s lithium battery is below the 100 Wh threshold and is therefore excepted from being a Class 9 – MiscellaneousDangerous Goods (DG). As such, the Puritan Bennett 520 Ventilator and/or the associated Lithium-ion battery are subject to some transport conditions under the Dangerous Goods Regulation for air transport (IATA: International Air Transport Association), International Maritime Dangerous Goods code for sea and the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) for Europe. Private individuals who transport the device are excluded from these regulations although for air transport some requirements apply. For air transport; the Puritan Bennett 520 Ventilator is permitted as checked-in or carry-on baggage. Spare batteries may be taken on board as carry-on luggage only. This classification and regulatory requirements may vary depending upon the country and mode of transport. Therefore it is recommended that users verify with the carrier / airline as to which measures to take before the voyage. 2-6 Service Manual General Information Table 2-3. Puritan Bennett 520 Ventilator Specifications (continued) Communication capabilities Remote alarm (nurse call) port. Allows alarm conditions to be annunciated at locations away from the ventilator (for example, when the ventilator is in an isolation room). The ventilator signals an alarm using a normally open or a normally closed signal. The ventilator annunciates a remote alarm when there is an active alarm condition, unless the audio paused function is active, and when the ventilator power switch is turned off. The remote alarm port is an 8-pin female connector. Allowable current is 100 mA at 24 V DC (maximum). 4 3 5 2 6 1 8 7 Nurse call pin-out (view from back of ventilator) Pin Signal Remote alarm cable wire color 1 relay common black 2 normally open (NO) brown 3 normally closed (NC) orange 4 not used -- 5 not used -- 6 not used -- 7 not used -- 8 not used -- WARNING To connect the ventilator to a Nurse Call device, contact Covidien to check the ventilator’s compatibility with the Nurse Call device and order a suitable connection cable. Before using the Nurse Call system, ensure that its connections are secure and it operates properly. Do not use Nurse Call devices that operate based on the closure of an electrical circuit, because the devices often do not take into account possible cable disconnection or a total loss of power. Ensure that the Nurse Call device is always connected to the ventilator. PC communication port. Allows communication between the ventilator and a PC. Used for software uploads and data downloads. Service Manual 2-7 General Information Table 2-3. Puritan Bennett 520 Ventilator Specifications (continued) Communication capabilities (cont.) Two Type A USB ports are included on the Puritan Bennett 520 Ventilator for obtaining trended, event, and monitoring information. Alarm volume 65 to 80 dBA ± 10% (as measured per IEC 60601-1-8) Ventilator operating volume 30 dBA + 10% Ventilator airway resistance Inspiratory resistance 1.0 cmH2O at 30 lpm 3.7 cmH2O at 60 lpm Expiratory resistance 0.5 cmH2O at 30 lpm 1.1 cmH2O at 60 lpm Ventilator airway compliance Internal ventilator compliance 0.0001 L/cmH2O Performance specifications Working pressure 5 cmH2O - 55 cmH2O Maximum pressure limit 60 cmH2O Sound pressure level 30 dBA per ISO 17510-1 test conditions Patient circuit inspiratory resistance Inlet air filter specifications Filter type mechanical; foam and fine particle filter Filtration efficiency 99.999982% at 30Lpm (filtering microbes 3.3 μm) Flow resistance 0.06 cmH2O at 24 lpm Inspiratory bacteria filter specifications Maximum allowable flow resistance (pressure drop) 2.4 4 cmH2O at 60 lpm Range, Resolution, and Accuracy Ranges, resolutions, and accuracies, for ventilator settings, alarm settings, and patient data are listed in Table 2-4. Note: Accuracies only apply in monitored patient data values. 2-8 Service Manual General Information Table 2-4. Puritan Bennett 520 Ventilator Range, Resolution, and Accuracy Setting or monitored parameter Range, Resolution, and Accuracy Ventilator settings Apnea Time (available in PSV ST and CPAP) Range: AUTO or 1 - 60 s Resolution: 1 s Default value: AUTO Dependencies: Backup R In PSV ST, Apnea time: AUTO = 60/Backup R s WARNING •In CPAP mode, APNEA TIME only drives the alarm signal — there is no backup rate. • Backup Rate (Backup R) (available in PSV ST) If the user has set Apnea Time to OFF in the SETUP menu, then the patient will receive backup ventilation during an APNEA condition, but will not sound an alarm. Range: 4 - 40 bpm or OFF Resolution: 1 bpm Default value: 13 Dependencies: Low I time Exhalation Sensitivity (Exh Sens) (available in PSV ST) Range: 5% to 95% of peak flow or -95% to -5% of peak flow depending upon E Sens setting selected in SETUP mode; positive or negative) Resolution: 5% Default value: 75% (AUTO) In CPAP Exh Sens is fixed at 25% and is not adjustable. Inspiratory Sensitivity (Insp Sens (available in P A/C, PSV ST) Range: OFF or 0P - 5 (0P indicates a pediatric setting. Autotriggering may result if this setting is used while ventilating an adult patient.) Resolution: 1 Default value: 2 In CPAP, Insp Sens is fixed at 2 and is not adjustable Mode Range: P A/C, PS V ST, CPAP Resolution: N/A Default value: P A/C Service Manual 2-9 General Information Table 2-4. Puritan Bennett 520 Ventilator Range, Resolution, and Accuracy (continued) Setting or monitored parameter Range, Resolution, and Accuracy PEEP (available in P A/C, PSV ST, CPAP) Range: OFF or 1 to 20 cmH2O; OFF corresponds to a 0.5 cmH2O target Resolution: 1 cmH2O Default value: OFF Dependencies: Pi, P Support The minimum PEEP value in CPAP mode is 4 (pressure units chosen by user) and OFF is not available. Inspiratory Pressure (Pi) Range: 5 cmH2O to 55 cmH20 in P A/C in valve configuration or 6 cmH2O to 30 cmH20 in leak configuration (see Section 3.6.5 for the differences between valve and leak configurations) Resolution: 1 cmH2O Default value: 15 cmH2O Dependencies: PEEP Pressure Support P Support (available in PSV ST) Range: OFF or 5 cmH2O to 55 cmH20 in valve configuration or 5 cmH2O to 30 cmH20 in leak configuration (see Section 3.6.5 for the differences between valve and leak configurations) Resolution: 1 cmH2O Default value: 15 cmH2O Dependencies: PEEP Respiratory Rate (R-Rate) (available in P A/C) Range: 1 bpm - 60 bpm in P A/C mode Resolution: 1 bpm Default value: 13 Dependencies: High Rtot Rise Time (available in P A/C and PSV ST) Range: 1-4 (1 is fastest, 4 is slowest) Resolution: 1 Default value: 2 I:E ratio (available in P A/C) Range: 1:4 to 1:1 Resolution: 0.1 Default value: 1:2 I/T ratio (available in P A/C) Range: 20% to 50% Resolution: 1% Default value: 33% Vt target (available in P A/C, PSV ST) Range: 50 mL to 2000 mL; OFF Resolution: 10 mL Default value: OFF (100 mL) Dependencies: Low VTI, High VTI 2-10 Service Manual General Information Table 2-4. Puritan Bennett 520 Ventilator Range, Resolution, and Accuracy (continued) Setting or monitored parameter Range, Resolution, and Accuracy Inspiratory Time (Insp Time) Range: 0.3 s to 6.0 s Resolution: 0.1 s Default value: 1.5 s Depends on: R-rate Low Inspiratory Time (Low I time) Range: AUTO or 0.1 to2.8 s Resolution: 0.1 s Default value: AUTO (Rise time + 300 ms) Dependencies: High I time, Backup R, Rise time High Inspiratory Time (High I time) Range: 0.8 to 3.0 s Resolution: 0.1 s Default value: AUTO (minimum of 3 s or 30/ monitored rate) Dependencies: Low I time, R-Rate Alarm settings (based on breath mode) Pressure A/C mode Low Inspired Tidal Volume (Low VTI) Range: 30 mL to 2000 mL; OFF Resolution: 10 mL Default value: 300 mL Dependencies: High VTI High leak Range: 5 lpm - 200 lpm; OFF Resolution: 5 lpm Default value: OFF To be used in non-invasive ventilation without an exhalation valve High Inspired Tidal Volume (High VTI) Range: 80 mL to 3000 mL; OFF Resolution: 10 mL Default value: 2000 mL Dependencies: Low VTI High Respiratory Rate High Rtot Range: 10 bpm to 70 bpm; OFF Resolution: 1 bpm Default value: OFF Dependencies: R-Rate PSV ST mode Low Inspired Tidal Volume (Low VTI) Range: 30 mL to 2000 mL; OFF Resolution: 10 mL Default value: 300 mL Dependencies: High VTI Service Manual 2-11 General Information Table 2-4. Puritan Bennett 520 Ventilator Range, Resolution, and Accuracy (continued) Setting or monitored parameter Range, Resolution, and Accuracy High Inspired Tidal Volume (High VTI) Range: 80 mL to 3000 mL; OFF Resolution: 10 mL Default value: 2000 mL Dependencies: Low VTI High leak 5 - 200 lpm or OFF Resolution: 5 lpm To be used in non-invasive ventilation without an exhalation valve High Respiratory Rate (High Rtot) Range: 10 bpm to 70 bpm; OFF Resolution: 1 bpm Default value: OFF Dependencies: Backup R CPAP Low Inspired Tidal Volume (Low VTI) Range: 30 mL to 2000 mL; OFF Resolution: 10 mL Default value: 300 Dependencies: High VTI High Inspired Tidal Volume (High VTI) Range: 80 mL to 3000 mL; OFF Resolution: 10 mL Default value: 2000 mL Dependencies: Low VTI High leak Range: 5 to 200 lpm; OFF Resolution: 5 lpm Default value: OFF High Respiratory Rate (High Rtot) Range: 10 bpm to 70 bpm; OFF Resolution: 1 bpm Default value: OFF Monitored patient data Expiratory Time (E time) Resolution: 0.1 s Accuracy: ± (100 ms) I:E Ratio (I:E) Resolution: 0.1 Accuracy: Insp. time ±50 ms and Exh. time ±50 ms or I:E Ratio ±10%, whichever is greater I/T Ratio Resolution: 1% Accuracy: Insp. time ±50 ms and Exh. time ±50 ms or I/T Ratio ±10%, whichever is greater 2-12 Service Manual General Information Table 2-4. Puritan Bennett 520 Ventilator Range, Resolution, and Accuracy (continued) Setting or monitored parameter Inspiratory Tidal Volume (VTI) Range, Resolution, and Accuracy In valve configuration: Resolution: 5 mL Accuracy: ± (10 mL + 10%) and ± (20 mL +20%) in CPAP mode above 200 mL In leak configuration: Resolution: 5 mL Accuracy: ± (20 mL +20%) Service Manual Positive End Expiratory Pressure (PEEP) Resolution: 1 cmH2O Total Respiratory Rate (R tot) Resolution: 1 bpm Leak (displayed only in leak ventilation without exhalation valve) Resolution: 1 lpm % Spontaneous cycles (appears in the ventilation report menu) Resolution: 1% Apnea index (AI) (appears in the ventilation report menu) Resolution: 1 Apnea time (appears in the ventilation report menu) Resolution: 1 Accuracy: ± (2 cmH2O + 8% of reading) Accuracy: ± 1 bpm Accuracy:± (3 lpm + 20%) Accuracy:± (1%) Accuracy:± 1 ev/h Accuracy: ± 1 s 2-13 General Information 2.5 Default Settings Table 2-5 through Table 2-7 lists the default settings of the Puritan Bennett 520 Ventilator. Downloading a new software version to the ventilator is the only way to automatically reset the ventilator’s parameters to these settings. You should, however, manually enter these settings when you are finished servicing the ventilator, if applicable. Table 2-5. Default Puritan Bennett 520 Ventilator Settings Parameter Setting Mode P A/C Pi 15 cmH2O PEEP OFF Rise Time 2 R - Rate 13 I:E 1:2.0 Insp Sens 2 Vt Target OFF Table 2-6. Default Puritan Bennett 520 Ventilator Alarm Settings Alarm Setting VTI (mL) Low 300 mL; High 2000 mL Leak (l/min) Low --; High OFF Rtot (bpm) Low -- ; High OFF Table 2-7. Default Puritan Bennett 520 Ventilator Preferences (after software download) Preference Backlight Setting OFF Contrast Alarm Volume 2-14 Key Sound Accept tone Apnea Alarm YES Disconnection alarm 15s Pediatric Circuit OFF Ventilation Report N/A Service Manual General Information Note: Access the Preferences menu from the main ventilation screen by placing the cursor at the Preferences position and pressing the Enter key. The ventilation report contains average values for a 24-hour period from 8:00 a. m. to 8:00 a.m. The report includes VTI, airway pressure, Rate, Leak, Apnea Index (apneic events per hour), Apnea Time, % Spontaneous cycles, machine hours, and patient hours. 2.6 Compliance and Approvals The Puritan Bennett 520 Ventilator was developed in accordance with pertinent North American and International standards (Table 2-8). The manufacturing facility for this product is certified to EN ISO 13485:2000 (ISO 13485:1996) Quality Systems - Medical Devices - Particular Requirements for the Application of ISO 9001:1994. The ventilator’s IEC 60601-1/EN 60601-1 classification is protection class II internally and mains powered (with detachable power cord), Type BF applied parts, IP31 (protection from ingress of moisture), continuous operation. The device is not suitable for use with flammable anesthetics, and is not suitable for sterilization. Table 2-8. Ventilator Compliance with Standards Standards/Certifications IEC 60601-1 Medical electrical equipment, Part 1: General requirements for safety: 1988 and all its amendments up to 1995 and EN 60601-1:1990 UL 60601-1 Medical electrical equipment, Part 1: General requirements for safety: 2003 IEC/EN 60601-1-2 Medical electrical equipment, Part 1-2: General requirements for safety, Collateral Standard: Electromagnetic compatibility - Requirements and tests: 2007 IEC 60601-1-4 Medical electrical equipment, Part 1: General requirements for safety-2- Collateral Standard: Programmable Electrical Medical Systems: 2000 EN 60601-1-4 Medical electrical equipment, Part 1: General requirements for safety-2- Collateral Standard: Programmable Electrical Medical Systems: 2004 IEC 60601-1-6 Medical electrical equipment, Part 1: General requirements for safety-2- Collateral Standard: Usability: 2006 EN 60601-1-6 Medical electrical equipment, Part 1: General requirements for safety-2- Collateral Standard: Usability: 2007 IEC 60601-1-8 General requirements, tests and guidance for alarm systems in medical electrical equipment and medical electrical systems: 2006 EN 60601-1-8 General requirements, tests and guidance for alarm systems in medical electrical equipment and medical electrical systems: 2007 EN ISO 10651-6 Lung ventilators for Medical Use - Particular Requirements for basic safety and Essential Performance, Part 2: Home Care Ventilators for Ventilator-Dependent Patients: 2009 and Chinese version YY0600.1-2007 CAN/CSA C22.2 No. 601-1-M90 Supplement 1-94 Medical Electrical Equipment, Part 1: General Requirements for Safety: Reaffirmed 2005 Medical Device Directive 93/42/EEC as amended by 2007/47/EC. Directive 2006/66/EC: 2006 Batteries and Accumulators and Waste Batteries and Accumulators Directive 2002/96/EC: 2003 Waste Electrical and Electronic Equipment Service Manual 2-15 General Information Table 2-8. Ventilator Compliance with Standards Standards/Certifications EN ISO 5356-1 Anesthetic and respiratory equipment - Conical connectors - Part 1: Cones and sockets: Part 1 re-issued 2004 EN 50419 Marking of Electrical and Electronic Equipment: 2005 ISO 10651-3: 1997 Sections 21.6a (vibration sinusoidal) 21.6b (random vibration), and 21.6.c (bump test) of Lung Ventilator for Medical Use - Part 3: Particular Requirements for Emergency Transport Ventilators Compatible with drop test according to 10.1.3 d article of draft IEC 60601-1-11: 2008 Medical Electrical Equipment - Part 1-11: General Requirements for Basic Safety and Essential Performance - Collateral Standard: Requirements for Medical Electrical Equipment and Medical Electrical Systems used in the Home Healthcare Environment (document IEC/SC62A 62A/624/CD) RTCA DO-160E: 2007 section 21 (emission of Radio Frequency Energy) of Environmental Conditions and Test Procedures for Airborne Equipment 2.6.1 Manufacturer’s Declaration The following tables contain the manufacturer’s declarations for the Puritan Bennett 520 Ventilator electromagnetic emissions, electromagnetic immunity, recommended separation distances between ventilator and portable and mobile RF communications equipment, and a list of compliant cables. WARNING • Portable and mobile RF communications equipment can affect the performance of the Puritan Bennett 520 Ventilator. Install and use this device according to the information contained in this manual and the Puritan Bennett 520 Ventilator User’s and Clinician’s Manual. • 2-16 The Puritan Bennett 520 Ventilator should not be used adjacent to or stacked with other equipment, except as specified in this manual and the Puritan Bennett 520 Ventilator User’s and Clinician’s manual. If adjacent or stacked use is necessary, the ventilators should be observed to verify normal operation in the configurations in which they will be used. Service Manual General Information Table 2-9. Electromagnetic Emissions The Puritan Bennett 520 Ventilator is intended for use in the electromagnetic environment specified below. The customer or the user of the ventilator should assure that it is used in such an environment. Radiated RF emissions Group 1 CISPR 11 Class B Conducted RF emissions Group 1 CISPR 11 Class B Harmonic emissions Class A IEC 61000-3-2 Voltage fluctuations/ flicker emissions IEC 61000-3-3 Service Manual Complies The Puritan Bennett 520 Ventilator uses RF energy only for its internal functions. Therefore, its RF emissions are very low and are not likely to cause any interference in nearby electronic equipment. The Puritan Bennett 520 Ventilator is suitable for use in all establishments including domestic establishments and those directly connected to the public lowvoltage power supply network that supplies buildings used for domestic purposes. 2-17 General Information Table 2-10. Electromagnetic Immunity The Puritan Bennett 520 Ventilator is intended for use in the electromagnetic environment specified below. The customer or the user of the ventilator should assure that it is used in such an environment. Immunity Test IEC 60601-1-2 Test Level Compliance Level Electrostatic discharge (ESD) ± 6 kV contact ± 6 kV contact IEC 61000-4-2 ± 8 kV air ± 8 kV air Electrical fast transient/burst ± 2 kV for power supply lines ± 2 kV for power supply lines ± 1 kV for input/output lines ± 1 kV for input/output lines ± 1 kV lines/lines ± 1 kV lines/lines ± 2 kV lines/earth ± 2 kV lines/earth IEC 61000-4-4 Surge IEC 61000-4-5 Voltage dips, short interruptions and voltage variations on power supply input lines IEC 61000-4-11 Power frequency (50/60 Hz) magnetic field < 5% UT < 5% UT (> 95% dip in UT for 0.5 cycle) (> 95% dip in UT for 0.5 cycle) 40% UT 40% UT (60% dip in UT for 5 cycles) (60% dip in UT for 5 cycles) 70% UT 70% UT (30% dip in UT for 25 cycles) (30% dip in UT for 25 cycles) < 5% UT < 5% UT (> 95% dip in UT for 5 s) (> 95% dip in UT for 5 s) 3 A/m 3 A/m IEC 61000-4-8 Electromagnetic Environment – Guidance Floors should be wood, concrete, or ceramic tile. If floors are covered with synthetic material, the relative humidity should be at least 30%. Mains power quality should be that of a typical commercial or hospital environment. Mains power quality should be that of a typical commercial or hospital environment. Mains power quality should be that of a typical commercial or hospital environment. If the user of the Puritan Bennett 520 Ventilator requires continued operation during power mains interruptions, it is recommended that the Puritan Bennett 520 Ventilator be powered from an uninterruptible power supply or a battery. Power frequency magnetic fields should be at levels characteristic of a typical location in a typical commercial or hospital environment. Note: UT is the AC mains voltage prior to application of the test level. 2-18 Service Manual General Information Table 2-11. Electromagnetic Immunity — Conducted and Radiated RF The Puritan Bennett 520 Ventilator is intended for use in the electromagnetic environment specified below. The customer or the user of the ventilator should assure that it is used in such an environment. Immunity Test Immunity Test Compliance Level Conducted RF Conducted RF 3 Vrms IEC 61000-4-6 IEC 61000-4-6 150 kHz to 80 MHz outside ISM bands 10 Vrms inside ISM bands Electromagnetic Environment – Guidance Portable and mobile RF communications equipment should be used no closer to any part of the Puritan Bennett 520 Ventilator, including cables, than the recommended separation distance calculated from the equation applicable to the frequency of the transmitter. Recommended separation distance d = 0.35 P d = 1.2 P Radiated RF Radiated RF IEC 61000-4-3 IEC 61000-4-3 10 V/m 80 MHz to 2.5 GHz d = 1.2 P 80 MHz to 800 MHz d = 2.3 P 800 MHz to 2.5 GHz where P is the maximum output power rating of the transmitter in watts (W) according to the Service Manual 2-19 General Information Table 2-11. Electromagnetic Immunity — Conducted and Radiated RF (continued) The Puritan Bennett 520 Ventilator is intended for use in the electromagnetic environment specified below. The customer or the user of the ventilator should assure that it is used in such an environment. Immunity Test Immunity Test Compliance Level Electromagnetic Environment – Guidance transmitter manufacturer and d is the recommended separation distance in meters (m)b. Field strengths from fixed RF transmitters, as determined by an electromagnetic site surveyc, should be less than the compliance level in each frequency ranged. Interference may occur in the vicinity of equipment marked with the following symbol: Note: • • At 80 MHz and 800 MHz, the higher frequency range applies. These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects, and people. a The ISM (industrial, scientific, and medical) bands between 150 kHz and 80 MHz are 6.765 MHz to 6.795 MHz’; 13.553 MHz to 13.567 MHz; 26.957 MHz to 27.283 MHz; and 40.66 MHz to 40.70 MHz. b The compliance levels in the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2.5 GHz are intended to decrease the likelihood that mobile/portable communications equipment could cause interference if it is inadvertently brought into patient areas. For this reason, an additional factor of 10/3 is used in calculating the recommended separation distance for transmitters in these frequency ranges. c Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the Puritan Bennett 520 Ventilator is used exceeds the applicable RF compliance level above, the Puritan Bennett 520 Ventilator should be observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the Puritan Bennett 520 Ventilator. d Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 10 V/m. 2-20 Service Manual General Information Table 2-12. Recommended separation distances Between Portable and Mobile RF Communications Equipment and the Puritan Bennett 520 Ventilator The Puritan Bennett 520 Ventilator is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the Puritan Bennett 520 Ventilator can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the Puritan Bennett 520 Ventilator as recommended below, according to the maximum output power of the communications equipment Rated maximum output power of transmitter (W) Separation distance according to frequency of transmitter (m) 150 kHz to 80 MHz outside ISM bands d = 0.35 P 150 kHz to 80 MHz in ISM bands d = 1.2 P 80 MHz to 800 MHz 800 MHz to 2.5 GHz 0.01 0.035 0.12 0.12 0.23 0.1 0.11 0.38 0.38 0.73 1 .35 1.2 1.2 2.3 10 1.1 3.8 3.8 7.3 100 3.5 12 12 23 d = 2.3 P d = 1.2 P For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m) can be determined using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer. Note: • • Service Manual At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies. The ISM (industrial, scientific, and medical) bands between 150 kHz and 80 MHz are 6.765 MHz to 6.795 MHz; 13.553 MHz to 13.567 MHz; 26.957 MHz to 27.283 MHz; and 40.66 MHz to 40.70 MHz. • An additional factor of 10/3 is used in calculating the recommended separation distance for transmitters in the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2.5 GHz to decrease the likelihood that mobile/portable communications equipment could cause interference if it is inadvertently brought into patient areas. • These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects, and people. 2-21 General Information WARNING The use of accessories and cables other than those specified, with the exception of parts sold by COVIDIEN as replacements for internal components, may result in increased emissions or decreased immunity of the Puritan Bennett 520 Ventilator. Table 2-13. Compliant Cables and Accessories Cable or accessory P/N 2981499 Maximum length 5.74 ft (1.75 m) Mains power cord, Australia P/N 2977099 5.74 ft (1.75 m) Mains power cord, Canada P/N 2971899 5.74 ft (1.75 m) Mains power cord, UK P/N2972099 5.74 ft (1.75 m) Mains power cord, Japan P/N 2972399 5.74 ft (1.75 m) Mains power cord, China P/N 2972499 5.74 ft (1.75 m) Mains power cord, SAF/India P/N 2971799 5.74 ft (1.75 m) Mains power cord, EU P/N various, contact your local representative 5.74 ft (1.75 m) Mains power cord, Latin America P/N 10094626 16.40 ft (5 m) Remote alarm cable P/N 3824600 4.26 ft (1.3 m) 12V cable (for connection to automobile DC power port) 2.7 Tools, Equipment, and Service Materials Table 2-14 lists the tools, equipment, and service materials needed to service the Puritan Bennett 520 Ventilator. NOTE: Part numbers are subject to change. 2-22 Service Manual General Information Table 2-14. Tools, Equipment, and Service Materials Tool Manufacturer/model or COVIDIEN part number Where used Calibration shell S-231702-00B (or equivalent) Performance verification Connector, 22 mm barbed to 22 mm conical 4-018075-00 Performance verification Stopper, no. 1 4-009523-00 Performance verification Coupling, silicone 4-003443-00 Performance verification DC power supply Extech model 382202 or equivalent Performance verification Digital multimeter (DMM) with 3 decimal place resolution Fluke 87 or equivalent Performance verification Disinfectant/cleaner The following cleaners/disinfectants are suitable for use on the exterior surfaces of the Puritan Bennett 520 Ventilator: General cleaning adjustable, 0-18 VDC, 0-3 Amps Mild dishwashing detergent 70% isopropyl alcohol (rubbing alcohol) 10% chlorine bleach (90% tap water) Glutaraldehyde Hospital disinfectant cleaners (phenolic-based: o-Phenylphenol 10.5%, o-Benzyl-p-chlorophenol 5.0%; Amphyl or equivalent) Hydrogen peroxide 15% ammonia (85% tap water) Ammonia based household cleaners Household cleaners (Alkyl Dimethyl Benzyl Ammonium Chloride 0.3%, 409 or equivalent) Service Manual Electrical safety analyzer Fluke ESA 620 or equivalent analyzer capable of performing electrical safety tests for Class II, Type BF equipment. Performance verification Patient lead test cable Supplied with Fluke ESA 620 Performance verification (electrical safety test) Electrical safety test ground cable 10000017 Performance verification (ventilator/safety tester ground connection) 2-23 General Information Table 2-14. Tools, Equipment, and Service Materials (continued) Tool DC test cable Manufacturer/model or COVIDIEN part number 10000021 modified to attach to 12 V power supply Electrostatic shielding bag Where used Performance verification (ventilator/safety tester connection) General servicing of electronics 8 x 5 in. (20.3 x 12.7cm) 4-009803-00 11 x 14 in. (27.9 x 35.5 cm) 4-009800-00 18 x 14 in. (45.7 x 35.6 cm 4-009801-00 External oxygen hose Local supplier Performance verification Flex tube (standard tube), 21.0 in. (53.4 cm) 4-018506-00 Performance verification Bacteria filters (x2) See Table 2-2 for recommended part numbers Performance verification Leak detector solution 4-004489-00 Leak testing oxygen solenoid valve connections Oxygen connector, male 2962700 Performance verification Power cord assembly 2977099 Performance verification Personal computer with USB capability Local supplier Software upload to ventilator Event log download from ventilator Performance verification PTS 2000 Pneumatic Calibration Analyzer 4-076185-00 Performance verification Puritan Bennett™ 500 Series Ventilator Test Software 10059515 Performance verification Remote alarm test box 10000019 (compatible with remote alarm harness 10028752) Performance verification Remote alarm test box 10005329 (compatible with remote alarm harness 10005246) Silicone tubing, 7/32” ID (5 to 6 mm ID), various lengths Local supplier Silicone tubing, 1/8” ID (3.2 to 4 mm ID), various lengths Small Tee connector to fit 1/8” tubing 2-24 Performance verification 4-008578-00 Local supplier Performance verification Service Manual General Information Table 2-14. Tools, Equipment, and Service Materials (continued) Tool Standard tool kit including: Manufacturer/model or COVIDIEN part number Where used Local supplier Service and repair Static-dissipative field service kit (includes wrist strap, static dissipative mat, and ground cord) 4-018149-00 or equivalent General servicing of electronics Test lung, various sizes 4L 4-075578-00 or equivalent Performance verification Test lung, Covidien LNG800P or equivalent Performance verification USB cable, mini type B 10094627 Software upload to ventilator Hexalobular (Torx®) drivers sizes T8, T9, T10, T20 #1 Phillips screwdriver Needle nose pliers Small flat bladed screwdriver Tie wraps Tie-wrap applicator gun Cable cutter Event log download from ventilator USB cable, standard Local supplier Performance verification USB memory device (128 MB minimum memory requirement and formatted in the 32-bit file format) Local supplier Performance verification 2.8 Preventive Maintenance Caution • To prevent component damage due to excessive wear, perform preventive maintenance and replace components at recommended intervals, as indicated in Table 2-15. You may find it convenient to note anticipated replacement dates for all components based on typical usage rates or recommended intervals. • Covidien has determined the Puritan Bennett 520 Ventilator preventive maintenance schedule based on the life expectancies of ventilator parts. Be aware that these parts, listed below, could also require unscheduled corrective maintenance and that other parts, not listed, could also require corrective maintenance during your ventilator’s lifetime. Table 2-15 lists the periodic maintenance activities required for the Puritan Bennett 520 Ventilator. You can find the total machine hours on the welcome screen that appears when you turn on the power switch, in the preferences screen in normal operation, and Service Manual 2-25 General Information also when you enter Maintenance mode (refer to Section 2.12 for information on how to enter Maintenance mode.) Table 2-15. Preventive Maintenance Schedule Frequency Part/Process Maintenance As often as necessary Ventilator external surface Clean and disinfect. Refer to Section 5.6.1 for ventilator cleaning instructions. Ventilator dual bag Clean dual bag regularly (can be machine washed). According to institutional protocol and/or manufacturer recommendation Inspiratory bacteria filter Replace. Patient circuit Replace. With each new patient Inspiratory bacteria filter Replace. Patient circuit Replace. Disinfect ventilator Disinfect using one of the disinfectants listed in Table 2-14. Disinfect inspiratory block Re-calibrate inspiratory flow sensor. See Section 6.9.3 for calibration instructions. Check or replace once per month or more often. Inlet air filter Replace. Note: In particularly dusty environments, replace the inlet air filter more frequently to prevent clogging, even if the preventive maintenance period has not elapsed. Refer to Section 5.7.1 for inlet air filter replacement instructions. 2-26 Service Manual General Information Table 2-15. Preventive Maintenance Schedule (continued) Frequency Part/Process Maintenance Every two years Measurements check and calibration Refer to Section 6.6 and Section 6.7 for measurements check and calibration instructions. Inspiratory block *Clean and disinfect inspiratory block using one of the disinfectants listed in Table 2-14. Inspiratory flow sensor Re-calibrate inspiratory flow sensor. Refer to Section 6.9.3for inspiratory flow sensor calibration instructions. Battery, lithium-ion 2.4 Ah Replace. Refer to Section 5.7.4 for battery removal and replacement instructions. Battery, lithium 3V Replace. Refer to Section 5.7.11 for 3V battery removal and replacement instructions. Buzzer PCBA Replace. Refer to Section 5.7.13 for buzzer PCBA removal and replacement instructions. Oxygen solenoid valve Replace. Refer to Section 5.7.14 for oxygen solenoid valve removal and replacement instructions. Turbine Refer to Section 5.7.16 for turbine removal and replacement instructions. Every 15,000 hours of use Exhalation solenoid valve Replace. Refer to Section 5.7.8 for exhalation solenoid valve removal and replacement instructions. Cooling fan Replace. Refer to Section 5.7.19 for cooling fan removal and replacement instructions. * To prevent cross contamination, both cleaning and disinfection of the inspiratory block and flow sensor calibration should be considered before new patient use in the event that filters were not used at the inspiratory port or proximal Y piece. Service Manual 2-27 General Information 2.8.1 Preventive Maintenance Parts Table 2-16 lists the parts available for Preventive maintenance. Table 2-16. Preventive Maintenance Parts List Part description Part Number Inlet air filter (6 pk) 10028771 Battery, Li-ion 2.4 Ah memory 10000541 Battery, Li-ion 2.4 Ah memory 10087046 Requires minimum revision power management software AL020002 2-28 Battery, lithium, 3V 10022884 Turbine 10028768 Exhalation solenoid valve 3818699 Cooling fan 10028754 Oxygen solenoid valve 10028763 Buzzer PCBA 10108395 Service Manual General Information 2.9 Controls, Indicators, and Interfaces This section lists the Puritan Bennett 520 Ventilator controls, indicators, and interfaces. Figure 2-1. Control Panel Table 2-17. Puritan Bennett 520 Ventilator Control Panel Keys and Indicators Index Figure 2-1 Function 1 Alarm indicators. Red LED indicates an active high priority alarm. Yellow LED indicates active medium priority alarms. 2 .Alarm control key. Press and release once to pause the audio portion of the alarm for 60 s. Press and release twice to activate the alarm paused function. When alarm paused is active, audible and visual alarm signals are suspended. 3 Service Manual Labeling N/A LCD panel. Displays ventilation modes and parameters, alarms, and ventilator configuration information. 2-29 General Information Table 2-17. Puritan Bennett 520 Ventilator Control Panel Keys and Indicators Index Figure 2-1 2-30 Labeling Function 4 Up arrow key. Up arrow key moves the cursor upward in a menu, and increases a setting value when a parameter is selected. 5 Enter key. Accepts a setting or enables selections within a submenu. 6 Down arrow key. Down arrow key moves the cursor downward in a menu and decreases a setting value when a parameter is selected. 7 Menu key. Use this key to switch between the ventilator parameters and alarm settings screens. When a USB memory device is inserted into the USB port, this key activates the USB memory device screen. Service Manual General Information Table 2-17. Puritan Bennett 520 Ventilator Control Panel Keys and Indicators Index Figure 2-1 8 9 Labeling Function Ventilation ON/OFF key. Press and release key to start ventilation. Press and hold key for 3 seconds to stop ventilation. Confirm stop by pressing the Ventilation ON/OFF key again. Ventilator status indicator. When lit, blue LED indicates ventilator is in standby mode, and enables the user to locate the Ventilation ON/OFF key at night. During ventilation, LED is off. 10 AC power indicator. When lit, green LED indicates ventilator is connected to AC power DC power indicator. When lit, green LED indicates ventilator is connected to an external DC power source (e.g., automobile cigarette lighter or power port). Internal battery indicator. When lit, green LED indicates ventilator is operating on internal battery power if no other power source is connected. LED flashes when the internal battery is charging, and turns off when the battery is charged. Service Manual 2-31 General Information Figure 2-2. Puritan Bennett 520 Ventilator Front View Table 2-18. Puritan Bennett 520 Ventilator Front Panel 2-32 Index Figure 2-2 Labeling Function 1 N/A LCD panel. Displays ventilation modes and parameters, alarms, and ventilator configuration information. 2 N/A Ventilator keypad 3 Exhalation valve pilot port. Port used to apply pressure to the exhalation valve diaphragm. 4 To patient port. Gas output port to which patient circuit connects. Service Manual General Information Table 2-18. Puritan Bennett 520 Ventilator Front Panel Index Figure 2-2 Labeling 5 6 Function Proximal pressure port N/A Front air vent. Allows air flow through the ventilator for electronics cooling. Figure 2-3. Puritan Bennett 520 Ventilator Rear View Table 2-19. Puritan Bennett 520 Ventilator Rear Panel Labels and Markings Index Figure 2-3 Labeling 1 2 3 Service Manual Function USB ports. Two Type-A receptacles designed to use a 32-bit formatted USB memory stick. N/A Carrying handle. Handle is integrated into the top housing. PC communication port. One USB Type-B mini receptacle for connection to a personal computer (PC). Used for software uploads and data downloads. 2-33 General Information Table 2-19. Puritan Bennett 520 Ventilator Rear Panel Labels and Markings Index Figure 2-3 Function 4 DC power cord connector. Keyed connector for DC power cord. 5 AC power cord connector. Connector for AC mains power. 6 I/O ON/OFF switch. Applies/removes power to the ventilator. Protective cover prevents accidental switch actuation. 7 N/A Power cord retainer. Prevents inadvertent power cord disconnection. 8 N/A Internal battery cover. Provides access to internal battery. 9 2-34 Labeling Oxygen connector. Connector for low pressure oxygen line. Service Manual General Information Table 2-19. Puritan Bennett 520 Ventilator Rear Panel Labels and Markings Index Figure 2-3 Labeling Function 10 Nurse call connector. Connector for nurse call cable. 11 Air inlet label. Identifies ventilator air inlet. See Table 2-22 for description of individual symbols. Figure 2-4. Top View Service Manual 2-35 General Information Figure 2-5. Bottom View 2-36 Service Manual General Information Table 2-20. Puritan Bennett 520 Ventilator Bottom Panel Index Figure 2-5 Labeling Function 1 Product Identification label: a: Device name/model a b: Serial number b e d c Service Manual c: Storage temperature range d: Manufacturer name and address, country of origin e: Manufacture date (year) 2-37 General Information Figure 2-6. Side View Table 2-21. Puritan Bennett 520 Ventilator Side Panel Index Figure 2-6 Labeling Function 1 N/A Side air vents. Allow air flow through the ventilator for electronics cooling. 2.10 Symbols, Abbreviations, and Internal Labels The following table lists symbols and abbreviations found on the Puritan Bennett 520 Ventilator screens or on the device or its labels, and contains labels not referenced in Figure 2-1 through Figure 2-3. 2-38 Service Manual General Information Table 2-22. Puritan Bennett 520 Ventilator On-screen Symbols, Abbreviations, and Internal Labels Symbol Meaning Symbols found on ventilator screens Pressure rise times. In pressure ventilation modes, you can select one of four rise times: Setting 1 = fastest Setting 2 Setting 3 Setting 4 = slowest Battery capacity indicator. Battery capacity appears as a percentage of full charge. Software lock enabled. Access to ventilator patient settings, preferences menu, alarm settings, and maintenance mode is not permitted. There is access, however, to the ventilation menu, alarm menu, USB menu, alarm memory menu. To lock or unlock the ventilator: With the ventilator in standby or ventilation mode, simultaneously press and hold the UP and DOWN arrow keys for three seconds. Cursor. Shows cursor’s current position. Available parameter. Parameter may be selected when device is not locked. Unavailable parameter. Parameter cannot be changed when device is locked. ± Setting adjust indicator. Appears when you select a parameter for adjustment. Breath trigger indicator. Indicates a patient-initiated inspiration. Exhalation valve presence indicator. Indicates an exhalation valve is present in the patient circuit (valve configuration). Displayed on title line of ventilator screen. Exhalation valve absence indicator. Indicates an exhalation valve is not present in the patient circuit (leakage configuration). Displayed on title line of ventilator screen. Alarm off (Apnea off) indicator. Indicates apnea alarm has been set to OFF in the Preferences menu. Displayed on title line of ventilator screen. Alarm paused indicator. Indicates an alarm paused condition. Displayed on title line of ventilator screen. Service Manual 2-39 General Information Table 2-22. Puritan Bennett 520 Ventilator On-screen Symbols, Abbreviations, and Internal Labels Symbol Meaning Audio paused indicator. Indicates an audio paused condition. Displayed on title line of ventilator screen. Apnea time Time interval after which the ventilator detects an apnea condition. PC (P A/C) Pressure Assist/Control Ventilation mode PSV (ST) Pressure Support Ventilation CPAP Continuous Positive Airway Pressure mode Symbols and markings found on ventilator surfaces or labels Recycle electrical and electronic items with this marking according to local regulations (EN50419). Do not discard with ordinary household waste. This includes the ventilator and the battery. Electrostatic sensitive devices label (IEC 60417-5134). Located on inside of lower housing near Power Management PCBA. Observe necessary precautions when handling devices sensitive to electrostatic discharge (ESD). Type BF applied part (IEC 60417-5333). A regulatory standard classification for protection against electrical shock for the part of the device that contacts the patient. Attention - consult accompanying documents (ISO 7000-0434A). Consult instructions for use (ISO 7000-1641). Insulation class II equipment (IEC 60417-5172). A regulatory standard classification for protection against electric shock. Equipment in which protection against electric shock does not rely on basic insulation only, but in which additional safety precautions such as double insulation or reinforced insulation are provided, there being no provision for protective earthing or reliance upon installation conditions. CSA certification mark that signifies the product has been evaluated to the applicable Underwriters Laboratories Inc. (UL) and CSA standards for use in the US and Canada. 2-40 Service Manual General Information Table 2-22. Puritan Bennett 520 Ventilator On-screen Symbols, Abbreviations, and Internal Labels Symbol Meaning Ingress protection classification. Protected against access to hazardous parts with a tool. Protected against solid foreign objects of 2.5 mm diameter and greater. Protected against vertically falling water drops. Manufacturer (BS EN-980) Manufacture date (ISO 7000-2497). 2009 Storage temperature range (ISO 7000-0632) Mains warning label (located on Power Management PCBA power supply guard) Pneumatic cable routing diagram label (located on inside top housing) Battery installation label (located inside battery cover) Service Manual 2-41 General Information 2.11 Ventilator Serial Number and Software Versions The serial number can be found on the label on the bottom of the ventilator or on the Maintenance mode screen. The CPU and Power Management software versions appear on the welcome screen for approximately 10 seconds after turning the ventilator’s power switch on. When the ventilator is in Maintenance mode, the CPU and Power Management software versions are displayed on the screen (see Section 2.12 for instructions on how to enter Maintenance mode). 2.12 How to Configure the Ventilator The Setup screen allows you to configure the following parameters: • Language: English, English (US), Spanish, French, Italian, Japanese, Korean, Netherlands, Norwegian, Polish, Portuguese, Russian, Finnish, Swedish, Turkish, Chinese, Danish, German • • • • • • • • Date: DD MMM YYYY format Time: HH:MM:SS format Intentional Vent Stop: YES or OFF Pressure unit: cmH2O, mbar, hPa Alarm Tone: Compliant (softer) or Original (louder) Patient hours: XXXXX h XX min Reset hours: YES or OFF Restore Defaults: YES or OFF This parameter allows the user to reset all settings back to the original manufacturer defaults, except for the Language, Date, and Time. • Maintenance • Next Any settings changes are retained in the ventilator’s memory after the ventilator is turned off. To access the Setup screen and Maintenance mode: 1. Ensure the ventilator’s I/O switch is in the OFF (O) position. 2. Press and hold the ALARM CONTROL key while simultaneously switching the ventilator to the ON (I) position. Continue holding the key until the Setup screen appears. 2-42 Service Manual General Information Figure 2-7. Puritan Bennett 520 Ventilator Setup Screen Note: If the ventilator fails to enter SETUP, stop ventilation by pressing the Ventilation ON/OFF key for 3 seconds, and pressing again to confirm stop. Power off the ventilator then repeat steps 1 and 2 above. To change the language, date, time, or other settings: 1. Use the UP or DOWN arrow keys to place the cursor at the desired position and press the ENTER key. 2. Use the UP or DOWN arrow keys to change settings. 3. Press the ENTER key to confirm your selection. Note: • When a parameter contains several setup fields (e.g., Date, Time) after selecting the desired parameter, press the ENTER key to move from one field to the next. • If a change is not confirmed with the ENTER key after seven seconds, the ventilator restores the previous value. To change the alarm tone: 1. Use the UP or DOWN arrows to place the cursor on “Alarm Tone.” 2. Press ENTER. 3. Use the UP or DOWN arrows to select Compliant or Original. The default setting is Compliant. The audible sound of Compliant is softer than the Original tone, and meets the requirements of standard EN 60601-1-8. Original refers to the alarm tone that was shipped with the ventilator from initial release until the LS010101/LS010011 software update. Service Manual 2-43 General Information 4. Press ENTER to confirm the selection. To reset patient hours: 1. Use the UP or DOWN arrow keys to place the cursor at the "Patient Hours" position. 2. Press the ENTER key. The cursor moves to the "Reset Hours “position. 3. Press the ENTER key. "OFF" flashes. 4. Press the UP or DOWN arrow key to change the message to “YES”. 5. Press the ENTER key. "YES" appears continuously, a long "beep" sounds, and the patient counter display resets to 00000 h 00 min and the display shows "Reset Hours: OFF". To restore the default settings: 1. Use the UP or DOWN keys to place the cursor on “Restore Defaults.” 2. Press ENTER. “OFF” flashes. 3. Press UP or DOWN to change “OFF” to “YES.” 4. Press ENTER to reset all settings back to the manufacturer defaults, except for Language, Date, and Time. “OFF” will reappear. To enter Maintenance mode: 1. Press the DOWN arrow key to place the cursor at the “Maintenance” position. 2. Press the ENTER key. The Maintenance screen appears. 3. To go back to the Setup screen, press the UP or DOWN arrow key to place the cursor at the “Back” position and press the ENTER key. Once the ventilator is in Maintenance Mode, a menu appears with the following selections (Figure 2-8): • Faults check • Measurement check • Sensors calibration including a submenu with Patient pressure, Int valve pressure, and Inspiration Flow • Turbine speed • Back 2-44 Service Manual General Information Figure 2-8. Maintenance Screen on Puritan Bennett 520 Ventilator 1 Ventilator software version 2 Power management CPU software version 3 Ventilator serial number To access the Setup 2 menu: 1. Press the UP or DOWN arrows to place the cursor beside “Next.” 2. Press ENTER. The Setup 2 menu is displayed. Figure 2-9. Setup 2 Menu Service Manual 2-45 General Information The parameters in this menu are: • Cycling Mode: I:E or I/T I:E ratio is the ratio of inspiratory time to expiratory time. I/T is the inspiratory time divided by the total breath cycle time expressed as a percentage. The mode that uses this value is P A/C. • Relative Pressure: OFF or YES • E Sens Setting: Positive, Negative • Back The Back parameter allows the user to return to the Setup menu. 2.13 Service Philosophy Field service of the ventilator is limited to the service activities described in this manual. For field service, technical support, or information on technical training, contact your local Covidien representative. Servicing the Puritan Bennett 520 Ventilator consists of a three-step process (Figure 2-10). Figure 2-10. Service Process Troubleshoot ventilator Repair device or perform preventive maintenance Final performance verification 1. Troubleshoot the ventilator (as required) — Determine the cause of the problem and what components or assemblies need to be replaced. Use the information in Chapter 4 to diagnose ventilator malfunctions. 2. Repair the ventilator or perform Preventive Maintenance — See the schedule in Table 2-15 of this chapter for preventive maintenance intervals. Chapter 5 contains step-by-step instructions for disassembly, component repair or replacement, and reassembly. 3. Final performance verification — Calibrate the ventilator’s sensors and check the ventilator’s performance characteristics after servicing as described in Chapter 6 to ensure all problems have been corrected and no new problems have been introduced. 2-46 Service Manual 3 Theory of Operation This chapter contains the theory of operation of the Puritan Bennett™ 520 Ventilator and includes the following information: • overview of ventilator operation and the ventilator’s safety net • description of the ventilator components and their interactions during breath delivery • pneumatic system description • electrical system description. 3.1 Operational Overview When you turn the ventilator on, Power On Self Test (POST) automatically runs during the first 15 seconds. During this period, the ventilator checks the status of AC and internal battery power sources, tests the LEDs and alarms, and checks the integrity of memory. The LCD panel displays device and patient hours, ventilator software version, date, time, and copyright information. If POST fails, the ventilator resorts to a safe state where ventilation is not allowed: the exhalation valve opens, the turbine stops, the alarm sounds continuously, and the ventilation standby LED flashes. When POST passes, the ventilator remains in Standby mode until you press the Ventilation ON/OFF key to start ventilation. When ventilation is started, the software automatically performs a turbine speed test. The keyboard is used to enter breath delivery and patient alarm settings into the ventilator and to enter Maintenance mode — a non-ventilatory mode reserved for sensor calibrations and other performance checks. The keyboard is also used to set a software lock to prevent inadvertent changes to the prescribed settings. (Refer to Section 4.3.2 for instructions on and disable the software lock.) Ventilator and alarm settings are retained in non-volatile memory during periods when the ventilator is turned off. Breath delivery is based on a closed loop control system that adjusts the speed of the turbine. The speed of the turbine is controlled to the patient pressure signal. The turbine speed control algorithms vary according to the ventilation mode, ventilator settings, and whether the ventilator is in an inspiratory or expiratory phase. The speed of the turbine adjusts under software control during the expiratory phase to maintain the set PEEP level. Setting the pressure rise time influences the level of turbine acceleration at the start of inspiration. The transition between the inspiratory and expiratory phase is controlled by a deceleration or braking action proportional to the pressure difference between the two phases. 3-1 Theory of Operation Flow-triggering algorithms, using measurements from an inspiratory flow sensor, detect when inspiration begins and also determine the end of the inspiration phase when the ventilator is in PSV ST mode. When altitude compensation is turned on (default setting), the flow measurement is automatically corrected as a function of the atmospheric pressure measured by the ventilator’s internal barometer, body temperature and pressure saturated (BTPS) reference temperature, and standard pressure and temperature references. The turbine spins continuously throughout the breath, creating flow in the patient circuit. The exhalation valve, located in the inspiratory limb of the single-limb circuit, is fully closed during the inspiratory phase. A three-way solenoid valve on the CPU PCBA controls the pressure to the exhalation valve during the expiratory phase to allow purge and bias flows (created by the spinning turbine) to clear the patient circuit of exhaled gas. Inspiratory volume is reported in BTPS units when altitude compensation is set to YES, and ambient temperature and pressure dry (ATPD) units when altitude compensation is set to OFF. It is recommended to always set altitude compensation to YES. BTPS reference temperature is 37°C, and BTPS reference pressure is 1013 hPa (1033 cmH2O). The various measurement signals used in control and detection are electronically filtered in order to minimize electrical noise and prevent erroneous alarms. Consult the Puritan Bennett 520 Ventilator Clinician’s Manual for a detailed description of breath delivery in each mode. 3.2 Safety Net The ventilator uses software and hardware features to prevent and detect conditions that could adversely affect the patient’s safety or the safety of the device. A multiple priority alarm system is designed into the ventilator that includes operatorselectable low and high limits for breath delivery parameters, and built-in, nonadjustable alarms that can detect and announce unsafe patient conditions and various potential ventilator malfunctions. Alarms are indicated by audible alarm tones, flashing LEDs on the ventilator’s control panel, and current alarm message displays on the ventilator settings and alarm screens. A secondary audio alarm source is available in the event of failure of the primary alarm. The backup alarm can be tested in the Measurements Check menu of Maintenance Mode. Past alarms and technical faults can be viewed from the LCD screen or downloaded to a computer using Puritan Bennett™ 500 Series Ventilator Test Software. The alarm system is explained in detail in Chapter 4. Watchdog monitors exist to ensure correct operation for microprocessors, data acquisition channel integrity, and A/D reference voltage accuracy. Software checks these watchdogs and will trigger alarms if out-of-range values are found. Sensors measure the internal ventilator temperature and turbine temperature and the CPU monitors these temperatures within specified limits. Internal temperatures are also used to control the speed of the fan inside the ventilator. As temperatures rise, the fan’s speed increases. If temperatures go beyond safe limits, the ventilator stops ventilation and sounds an alarm. 3-2 Service Manual Theory of Operation To guard against potential high pressure conditions, software monitors the pressure transducers and will declare a high pressure alarm if any of the following conditions occur: • Inspiratory pressure is higher than the set high Pi limit • Inspiratory pressure is greater than the set inspiratory pressure + 5 cmH2O for pressures less than or equal to 29 cmH2O • Inspiratory pressure is greater than the set inspiratory pressure + 10 cmH2O for pressures from 30 to 60 cmH2O • Inspiratory pressure is greater than 60 cmH2O • Expiratory pressure is greater than the limits described above for longer than 100 ms An internal pressure sensor monitors the pressure at the ventilator outlet to provide a backup for pressure measurements if the proximal pressure tubing becomes disconnected. If a high pressure condition occurs during inspiration, the ventilator immediately switches to exhalation. If the high pressure occurs during exhalation, the exhalation valve is opened fully and the turbine stops. Supplemental oxygen is available via the oxygen inlet connector (maximum 7 psi or 15 lpm). The oxygen inlet connector uses an internal valve to prevent leaks when connecting and disconnecting an oxygen supply. Ventilator parameters and alarm limits are linked to prevent incompatible settings adjustments. Table 2-4 lists the dependencies for each parameter. In the event of a ventilator shutdown, the system is designed so that the exhalation valve remains open and that the patient can breathe room air through the turbine inlet and both limbs of the patient circuit. A software lock is available to prevent inadvertent changes of ventilator settings. (Refer to Section 4.3.2 for instructions on how to enable and disable the software lock.) A power switch cover is provided to prevent the ventilator from accidentally being switched off, and an alarm is present that annunciates if the ventilator is switched off using the power switch instead of stopping ventilation with the keypad first, then turning off power. 3.3 Ventilator Components The Puritan Bennett 520 Ventilator provides positive pressure ventilation using an electronically controlled micro-turbine to deliver air and supplemental oxygen to the patient. The two main systems that comprise the Puritan Bennett 520 Ventilator are the pneumatic system and the electronic system. Service Manual 3-3 Theory of Operation 3.4 Pneumatic System This section describes the components of the pneumatic system.Figure A-1in Appendix A shows a pneumatic block diagram of the Puritan Bennett 520 Ventilator, including the patient circuit. Table 3-1 lists the main pneumatic components and their operating ranges. Table 3-1. Pneumatic Component Operating Ranges Component Operating Range Inspiratory flow sensor 0 to 1000 sccm Proximal pressure sensor -10 to 100 cmH2O ± 1.5 cmH2O Inspiratory pressure sensor -10 to 100 cmH2O ± 1.5 cmH2O Exhalation valve pressure sensor -10 to 100 cmH2O ± 1.5 cmH2O Barometric pressure sensor 600 to 1100 cmH2O ± 10 cmH2O Turbine 50,000 rpm max flow range: 0 to 240 lpm Oxygen valve Inlet pressure: 7 psi, maximum Inlet flow: 15 lpm, maximum 3.4.1 Inlet Air Filter The inlet air filter combines a fine particle filter with a foam backing. The filter traps particles at 3.3 microns with 99.999982% efficiency at 30 lpm flow. 3.4.2 Low Pressure Oxygen Inlet/Valve This female inlet connector includes an internal valve to prevent leakage when connecting and disconnecting an oxygen source. The maximum oxygen source pressure is approximately 7 psi (50 kPa) at 15 lpm flow. A special coupling is provided with the ventilator to connect the oxygen supply hose to the inlet connector. 3.4.3 Oxygen Solenoid Valve The oxygen solenoid valve is a normally closed +24V DC two-way valve that is used to prevent oxygen from accumulating inside the ventilator. It opens when the ventilator is powered on and ventilating, and closes when the ventilator is in Standby or turned off. The CPU PCBA also commands this valve closed if there is an active DEVICE FAULT 6 (turbine overheat) alarm condition. 3.4.4 Inlet Silencer Part of the turbine assembly, the inlet silencer reduces noise from the air inlet side of the turbine. 3-4 Service Manual Theory of Operation 3.4.5 Turbine Assembly The turbine is a low-inertia blower driven by a brushless DC motor that delivers gas by responding to pressure and flow measurements that are processed on the CPU PCBA. The turbine spins at a maximum of 50,000 rpm, and can deliver flows of up to 240 lpm and maximum pressures of 70 cmH2O to 90 cmH2O. A resistive-type temperature sensor resides in the turbine housing. The CPU monitors the temperature and will shut the turbine down if the temperature rises above 70° C while the turbine speed is less than 1000 rpm. 3.4.6 Outlet Silencer Part of the turbine assembly, the outlet silencer reduces noise from the outlet side of the turbine. 3.4.7 Exhalation Solenoid Valve The exhalation solenoid valve is an electromagnetic, three-way proportional valve mounted on the CPU PCBA (Figure 3-1). It is used to control the pressure on the patient circuit exhalation valve diaphragm throughout the breathing cycle. Pressure supplied from the turbine connects to solenoid valve port 1 (Figure A-3). Solenoid valve port 2 directs pressure through the exhalation valve port on the inspiratory block to the patient circuit exhalation valve diaphragm, where the pressure is used to completely or partially close the exhalation valve. The voltage on the exhalation solenoid valve is under closed-loop control on a breath-tobreath basis using measurements from the inspiratory flow sensor. During inspiration, turbine gas flows from port 1 to 2 to apply pressure to the diaphragm to completely close the exhalation valve. At the beginning of exhalation, flow from the turbine is vented from port 2 to port 3, relieving pressure on the exhalation valve diaphragm. This allows an initial purge flow and accompanying bias flow to flush the patient’s exhaled gas from the patient circuit for the duration of exhalation (Figure A-3). During exhalation without PEEP, the flow path from port 2 to 3 is completely open allowing purge and bias flows. During exhalation with PEEP, flow is directed form port 1 to port 2 to apply a partial pressure to the patient circuit exhalation valve, while port 2 and port 3 are partially open simultaneously allowing purge and bias flows. The maximum bias flow does not exceed 40 lpm after a 15 breath-cycle stabilization period. Service Manual 3-5 Theory of Operation Figure 3-1. Exhalation Solenoid Valve 1 Flow from turbine (port 1 in Figure A-3) 2 Tube to tee intersection with inspiratory block, exhalation valve pilot port, and exhalation pressure transducer (port 2 in Figure A-3) 3 Port to atmosphere (port 3 in Figure A-3) Figure A-3 and its accompanying table depict the operation of the exhalation solenoid valve. During inspiration, all flow from port 1 to port 2 is applied to the exhalation valve diaphragm, keeping the valve closed. During exhalation without PEEP, the flow path from port 2-3 is completely open allowing purge and bias flows. During exhalation with PEEP, flow is directed from port 1 to port 2 to apply a partial pressure to the patient circuit exhalation valve, while port 2 and port 3 are partially open simultaneously allowing purge and bias flows. 3.4.8 Inspiratory Block The inspiratory block provides the means for inspiratory flow and pressure measurements. It includes a screen which creates a small pressure drop used to divert a portion of the inspired gas to the inspiratory flow sensor. This gas flows through a port on the upstream side of the screen, through the flow sensor, back into the gas stream through a port on the downstream side of the screen, then out the ventilator’s To Patient port. Pressure ports for inspiratory, proximal, and exhalation pressure measurements are also located in the inspiratory block. 3.4.9 Inspiratory Flow Sensor A mass air flow sensor located on the CPU PCBA measures inspiratory flow. A portion of the inspired flow is measured by the sensor which contains a heated sensing element 3-6 Service Manual Theory of Operation and internal circuitry used to control the turbine and determine the beginning of exhalation (based on the exhalation sensitivity setting). 3.4.10 Proximal Pressure Sensor The proximal pressure sensor, located on the CPU PCBA measures pressure at the patient wye via a tube that connects from the wye to the Proximal pressure port on the inspiratory block. This pressure measurement is used in the feedback loop to control the turbine speed during pressure ventilation modes. 3.4.11 Inspiratory Pressure Sensor The inspiratory pressure sensor, located on the CPU PCBA, measures pressure of the gas as it exits the ventilator. The ventilator substitutes this pressure measurement for the proximal pressure measurement as a safety backup in the event that the proximal pressure tube becomes disconnected. 3.4.12 Exhalation Valve (Internal Valve) Pressure Sensor The exhalation pressure sensor, located on the CPU PCBA, is used as a safety feature to detect the presence and proper operation of the patient circuit exhalation valve. The exhalation valve port on the inspiratory block provides the pathway for the pressure measurement. 3.4.13 Barometric Pressure Sensor The barometric pressure sensor is used to correct flow measurements when the device’s Altitude Compensation feature is enabled. Covidien recommends that Altitude Compensation always be set to YES in the Measurements Check screen of Maintenance Mode. 3.4.14 Patient Circuit The Puritan Bennett 520 Ventilator can only be used with a single-limb patient circuit. The circuit uses an exhalation valve to allow ventilation with a set PEEP level. A special patient circuit having only an inspiratory limb with a proximal pressure line connected and no exhalation valve must be used when NIV ventilation in CPAP or pressure support mode is selected. Service Manual 3-7 Theory of Operation A humidifier and water traps can be used in the circuit as shown in Figure 3-2. The patient must wear a vented NIV interface if a single-limb circuit without an exhalation valve is used. Figure 3-2. Puritan Bennett 520 Ventilator with Single Limb Circuit 1 Exhalation pilot pressure port 6 Patient circuit connection port 2 Proximal pressure port 7 Exhalation valve 3 Inspiratory bacteria filter 8 To proximal pressure port 4 Connecting tube from inspiratory filter to humidifier 9 Humidifier 5 Water trap 3.5 Electrical System This section describes the components of the electrical system and their functions. 3-8 Service Manual Theory of Operation 3.5.1 Power Management PCBA The Power Management PCBA performs the following functions in the Puritan Bennett 520 Ventilator: • • • • • • converts AC voltage to DC voltage converts, regulates, and distributes DC voltages manages internal battery charging and discharging automatically adapts battery management to the battery capacity identified prioritizes the use of AC, external DC, and internal battery power sources provides USB mini Type-B interface for Covidien service personnel to upload application software to the ventilator • provides two Type-A USB connectors used for obtaining trended information, which can be transferred to a PC • acquires and responds to voltage, current, and temperature measurements via a microcontroller. Figure A-2 provides a block diagram of the Power Management PCBA. 3.5.2 AC to DC Conversion AC power enters the Power Management PCBA through the mains connector with nominal input voltage and frequency ranges of 90 to 250 V AC and 50 to 60 Hz, respectively. The AC power is converted to 33 V DC (nominal) and supplies up to 3 A current. 3.5.3 DC Voltage Conversion and Distribution If AC power is unavailable, the ventilator may be connected through the DC input connector on the Power Management PCBA to an external DC power source (12 to 30 V DC), such as an automobile power port, or will obtain its power directly from the internal battery (26 V, nominal). Whether the DC voltage is supplied from AC, external DC, or internal battery, it is converted to four regulated voltages: • 24 V — Used to supply the turbine and fan directly from the Power Management PCBA, and distributed to the CPU PCBA. The Power Management PCBA monitors this voltage to ensure it remains within the range of 22 V to 26 V. The current output is limited to 4 A. • 5 V — Used by the Power Management PCBA electronics and distributed to the CPU PCBA for event memory. The Power Management PCBA monitors this voltage to ensure it remains within the range of 4.5 to 5.5 V. The current output is limited to 1 A. • 3.3 V — Used for RAM voltage supply and distributed to the CPU PCBA for monitored parameter memory. The Power Management PCBA monitors this voltage to ensure it remains within the range of 3.0 to 3.6 V. The output current is limited to 500 mA. • 3 V ref — Reference for voltage measurements. Service Manual 3-9 Theory of Operation 3.5.4 Internal Battery Charging and Discharging The Power Management PCBA manages internal battery charging and discharging using a combination of voltage, current, and temperature measurements, and charging time. Additional protections are in place to prohibit battery charging if charging current and voltage out-of-bounds conditions are detected. Battery charging occurs in two phases, and only when the ventilator is connected to an AC power source and when battery voltage drops below 28.5 V. In the first phase, the battery is charged using 500 mA (when ventilator is operating) or 1.5 A (when ventilator is not operating) until the battery reaches 29.4 V ± 1%. The second phase maintains this voltage and monitors the current. When the current drops to below 150 mA, the charging circuit turns off. When the battery discharges to 28.5 V, the charging cycle starts again. Over-charge voltage protection ensures that battery charging is canceled if battery voltage exceeds approximately 30 V. Over-discharge voltage protection prevents the battery from discharging below approximately 14 V. Battery usage is not allowed until the battery is charged to greater than approximately 19 V. Battery temperature also affects the ability of the battery to charge and discharge. Software controls are in place to discontinue battery charging if the battery temperature is greater than 45° C or less than 0° C. Software also prevents the battery from being used as the power source if the battery temperature is greater than 60° C or less than -10° C. Software estimates the battery capacity (mAh) delivered during charging and compares it to a maximum threshold value. If the estimated capacity is greater than the maximum value, the software determines that the charging time is too long, and a new battery charge cycle is not allowed. Battery discharging cycles are calculated every 5% of battery discharge, and are a function of the battery capacity at the start of a discharge, the remaining battery capacity, and the number of previous discharges (including partial discharges). The number of discharging cycles can be read from the Internal Battery Menu with the ventilator in Maintenance mode. The battery should be replaced when battery capacity is less than 1920 mAh. 3.5.5 Power Source Priority and Switching The Puritan Bennett 520 Ventilator can operate using Mains AC, DC power supplied by an external DC power source (e.g. automobile power port), or DC power supplied by an internal battery. The Power Management PCBA drives the LEDs on the ventilator’s control panel that indicate which power source is in use. When the ventilator is running using an external DC power source, the battery charging circuit does not function. When the ventilator is connected to more than one power source, the Power Management PCBA ensures that the resultant power source is available according to the priority shown in Table 3-2. In the table, presence means that there is at least the minimum power requirement available from the indicated source. During ventilator operation, if AC mains power is lost, the ventilator will automatically switch to external DC power, if available, or internal battery. When the ventilator is 3-10 Service Manual Theory of Operation running on internal battery, an audible signal is annunciated every hour as a reminder that the ventilator is running on battery power. A battery “fuel gauge” appears on the LCD panel letting you know the approximate capacity left in% or time units. Table 3-2. Power source Switching Priority Resultant power source used for ventilator operation External DC power source present Internal battery present – – – – – – AC – AC – – External DC power source – – – No ventilation AC present AC External DC power source Internal battery AC 3.5.6 USB Interface Two Type A and one mini B USB ports are provided on the Power Management PCBA. The type-A ports are used for obtaining trended, event, and monitoring information. Only one USB port may be used at a time, or an alarm message will annunciate. Up to 12 months of trended ventilator data may be stored on a USB key (128 MB minimum memory and 32-bit file format required). This information may be transferred to a PC. The mini B port is used for performance verification with Puritan Bennett™500 Series Ventilator Test Software and for uploading application software to the ventilator. The mini B port is used as a communication interface between a PC and the Power Management PCBA. A 115 K Baud rate is supported. WARNING Always verify that the serial number of the ventilator is correctly associated with the correct patient before using a USB memory device to transfer data between the ventilator and a PC. 3.5.7 Microcontroller Functions A PIC microcontroller on the Power Management PCBA processes data from the battery’s memory and temperature sensor, the internal ventilator temperature sensor (CT1), and voltage regulators. These data are communicated to the CPU PCBA via a Serial Peripheral Interface (SPI) bus and are monitored to determine the state of the ventilator. The microcontroller reads the internal ventilator temperature sensor and the battery temperature sensor and uses these readings to control the speed of the cooling fan, which maintains proper internal operating temperatures for the electronics. Service Manual 3-11 Theory of Operation During events such as ventilator operating software uploads or ventilator event log downloads, the Power Management PCBA microcontroller transmits PC communication data (at a 256 K Baud rate) to the CPU PCBA. At ventilator startup, during POST, the Power Management PCBA is responsible for temporarily disabling alarms. If an error is detected, the three power source LEDs flash, alarm functions are restored and a Very High Priority alarm sounds. The ventilator is prevented from entering Standby mode and ventilation is not allowed. 3.5.8 CPU PCBA The CPU PCBA performs the following functions: • • • • • • controls breath delivery functions of the ventilator displays information to the user through the LCD panel communicates with the Power Management PCBA provides continuous status and monitoring for errors stores ventilator settings, patient data, and events in memory interfaces with external devices. 3.5.9 Breath Delivery Functions Software running in the microcontroller on the CPU PCBA processes ventilator and alarm setting inputs from the keyboard. A turbine interface circuit uses the ventilator settings to generate a pulse-width-modulated (PWM) signal that controls the turbine speed appropriately for inspiration and exhalation. The microcontroller detects an inspiratory trigger when a combination of the current and previous inspiratory flow sensor measurements are greater than the inspiratory sensitivity setting in all modes except for CPAP, in which case the inspiratory flow readings are compared with an average flow. Exhalation occurs after the rise time has elapsed and when inspiratory flow has decreased from peak flow to a predetermined percentage of peak flow (or the set exhalation sensitivity in PSV ST). Signals from the on-board flow transducers provide feedback upon which the turbine adjusts its speed to maintain the set volume or pressure and PEEP level. A PWM signal drives the exhalation solenoid valve on the PCBA that controls the patient circuit exhalation valve. The voltage to the exhalation solenoid valve varies depending upon whether the breath cycle is in the inspiratory or expiratory phase. During the inspiratory phase, 24 V is applied to the valve which allows all flow to pass from port 1 through port 2, keeping the patient circuit exhalation valve closed. During exhalation, the voltage is modulated to allow flow through ports 2 and 3 (if no PEEP is set), or simultaneously through ports 2 and 3 and ports 1 and 2 (if PEEP is set). (See Figure A-3) During ventilation, a PWM signal opens a 2-way solenoid valve to allow the use of supplemental oxygen. The valve remains open as long as the device is in ventilation mode. It closes when the ventilator is turned off or in standby mode, or during a DEVICE FAULT 6 alarm condition which can occur if there is a combination of high turbine temperature and low turbine speed. 3-12 Service Manual Theory of Operation 3.5.10 LCD Panel Interface The LCD panel connects to the CPU PCBA through a parallel bus and provides a visual display of ventilator and alarm settings and service information. 3.5.11 Power Management PCBA Communication Communication between the CPU PCBA and the Power Management PCBA occurs through an SPI bus. The CPU PCBA receives AC, DC, and battery supply voltage status from the Power Management microcontroller and relays this information to the keyboard power LED indicators. A UART bus enables communication between the CPU and a PC through the Power Management PCBA. A 115.2 kBaud data transfer rate for event log downloads is supported, while software updates can occur at up to 256 kBaud. An analog signal is supplied by the Power Management PCBA for transmitting the battery voltage to the CPU PCBA. Figure A-2 provides a block diagram for Power management PCBA communication. 3.5.12 Status and Error Monitoring The CPU PCBA continuously monitors signals and voltages to determine the status of the ventilator. A watchdog circuit detects proper execution of processor instructions by receiving a pulse from the microcontroller at specified time intervals. If the watchdog does not receive the pulse at the appropriate time, a reset signal is generated, after which POST runs. If POST passes, ventilation continues as previously set. During POST, the ventilator is in its safe state, with turbine stopped and exhalation valve open. If POST fails, a Very High Priority alarm occurs and ventilation is not allowed. Reference voltage monitors on the CPU PCBA detect the status of 5 V, and 10 V reference voltages. If a drop in either of these voltages beyond 0.5 V, or 1.1 V, respectively, occurs, a digital signal is generated and an alarm is annunciated. A monitor for the 3.3 V supply voltage will generate a digital signal and alarm if a drop of greater than 0.3 V is detected. 3.5.13 Memory There are four types of memory on the CPU PCBA: ventilator settings memory, event memory, monitoring memory, and random access memory (RAM). Ventilator parameter and alarm settings are stored in a minimum of 4 kB of non-volatile memory to ensure settings are retained when the ventilator’s power is turned off or during a loss-of-power condition. A minimum of 512 kB of non-volatile event memory stores the event log. This log records information such as ventilator stops and starts, confirmed ventilator and alarm settings, and alarm and technical fault history including any associated audio paused or alarm paused key-presses, alarm resets, and acknowledgment key presses. This information is also retained when the ventilator is turned off and during power losses. Service Manual 3-13 Theory of Operation A minimum of 128 MB of non-volatile monitoring memory capacity is available for recording monitored patient data. These data are linked to the time of occurrence of associated events. A minimum of 64 KB of RAM is available for storage of operating software program variables. The data stored in RAM are not saved during periods when the ventilator is turned off. 3.5.14 Turbine Control PCBA The Turbine Control PCBA controls turbine speed and braking and transmits turbine speed and temperature feedback signals to the CPU PCBA. The Turbine Control PCBA also monitors the current in the turbine motor windings and the position of the motor via a position sensor input signal from the motor. In the event of a turbine malfunction, fault detection signals are generated from the Turbine Control PCBA and transmitted to the CPU PCBA. A 24 V input from the CPU PCBA to the Turbine Control PCBA produces a 15 V output to drive the motor controller logic devices. 3.5.15 Buzzer PCBA Two alarm buzzers are located on the Buzzer PCBA. The Buzzer PCBA is capable of producing 65 - 80 dBA alarm tones based on the alarm priority. A 4.8 V Ni-MH battery is mounted on the Buzzer PCBA to power the ventilator’s POWER SUPPLY LOSS alarm. The battery is charged to a maximum voltage of 5.6 V. At this point the charger switches to a trickle-charge mode which maintains the battery voltage. 3.5.16 Battery Connection PCBA The Battery Connection PCBA provides the physical connection between the battery and the Power Management PCBA. A connector with spring-loaded “fingers” on this PCBA touches the battery contacts providing DC power to the Power Management PCBA and allowing the battery temperature and memory to be read. 3.5.17 Internal Battery The rechargeable internal battery is a 14-cell lithium ion battery that includes a temperature sensor and a memory device which stores information such as battery identification, capacity, number of discharge cycles, manufacture date and time and battery cell type. The ventilator displays this information in the Internal Battery menu, accessible through Maintenance mode and Measurement Check. The battery identification information is checked by the Power Management PCBA and if the stored information is incorrect, or if the data are corrupt, a BATT FAULT 3 alarm will occur. 3-14 Service Manual Theory of Operation 3.5.18 Ventilator Compartment Temperature Sensor This sensor, located on the Power Management PCBA, measures the air temperature inside the ventilator. The temperature signal is used to control the speed of the fan in the ventilator compartment. 3.5.19 Fan A fan, located in the main ventilator compartment and controlled via the Power Management PCBA, produces air flow through the ventilator and battery compartments to cool the electronics and to expel any oxygen vented through the exhalation solenoid valve to the outside of the ventilator.Room air enters the ventilator through the vents in the battery cover at the rear of the device and exits through the cooling vents in the front and sides where the upper and lower housings meet (see Figure 2-2 and Figure 2-6). The fan runs continuously when the ventilator is connected to AC power regardless of whether the ventilator is powered off, powered on but in Standby mode, or ventilating. If the external or internal battery is used, the fan runs any time the power (I/O) switch is turned on. The fan’s speed adjusts to maintain an internal ventilator temperature of no greater than 60° C (measured on the Power Management PCBA), and a battery temperature of no greater than 40° C. Additionally, the fan will run at maximum speed if the internal ventilator temperature sensor should fail. 3.6 Ventilation Features 3.6.1 Vt Target The Puritan Bennett 520 Ventilator has the Vt target (Target Volume) feature as a part of pressure-based ventilation modes in non-invasive ventilation without an exhalation valve. This allows a range of pressures to be used to reach a set volume. If the mode is PSV ST or P A/C, you may select Vt Target within the range of 50 to 2000 mL (or OFF) which controls the inspired tidal volume to the target value you specify. An increasing or decreasing series of small pressure adjustments are applied and the inspired volume is measured. If the inspired volume is lower than the target volume, the pressure of the next breath increases a small amount and the inspired volume is measured again. If the inspired volume is higher than the target volume, the pressure of the next breath is decreased slightly, until the inspired volume matches the target volume. The pressure increases stop if the maximum inspiratory pressure is reached. 3.6.2 Leak Compensation Leak compensation is available on the Puritan Bennett 520 Ventilator in pressure-based ventilation modes. Leak compensation is used with non-invasive ventilation with a vented mask. It is normal for vented masks to have a known leak associated with them.The leak from the mask is estimated at the end of exhalation and this leak is taken into account in the patient’s inspired volume measurements. Service Manual 3-15 Theory of Operation 3.6.3 Circuit Detection and Management The Puritan Bennett 520 Ventilator can check the configuration of the patient circuit and high priority alarms will sound when the ventilator settings are incompatible with the circuit used. Some examples are: • • • • inspiratory pressure greater than 30 without an exhalation valve in the patient circuit expiratory pressure less than 4 without an exhalation valve in the patient circuit using CPAP mode with an exhalation valve in the patient circuit inspiratory or expiratory pressure difference less than 5 without a valve in the patient circuit These alarms will sound if a mode change is made that violates any of the aforementioned conditions. Upon detection of the incompatible circuit, the ventilator will not start ventilation, but will immediately detect when the circuit has been changed. 3.6.4 Relative or Absolute Pressure You can determine how you want to view pressure settings — in the relative or absolute mode. For example, if you configure the ventilator for relative mode, and pressure support or pressure control is set to 10 cmH2O and PEEP is set to 5 cmH2O then the inspiratory pressure delivered will read 15 cmH2O. If absolute pressure is selected with the same settings, the inspiratory pressure is 10 cmH2O. This also applies to P Max in target Vt. The pressure convention is selected in the SETUP menu. Refer to Section 2.12 to open the SETUP menu and configure the ventilator for the desired pressure display. Relative or absolute pressure is different than the pressure units the ventilator uses for displayed pressure. The pressure units can be selected in the SETUP menu with cmH2O, hPa, or mbar available. Peak Inspiratory pressure and End Inspiratory Pressure are calculated as follows: Peak Inspiratory Pressure during pressure rise shall not be more than (P SUPPORT or Pi + PEEP) if Relative pressure is YES or (P SUPPORT or Pi) if Relative pressure is OFF. End inspiratory pressure shall be within the setting (P SUPPORT or Pi + PEEP) ± 1 cmH2O + 10%) if Relative pressure is YES or (P SUPPORT or Pi) ± 1 cmH2O + 10%) if Relative pressure is OFF. The pressure overshoot during the pressure fall phase shall not be less than PEEP x 0.8 - 1 cmH2O. 3.6.5 Invasive or Non-invasive Ventilation The ventilator can be used invasively or non-invasively. If used invasively, the ventilator is said to be used in valve configuration. Valve configuration means that the ventilator has an exhalation valve attached at the exhalation port of the patient circuit.The inspiratory volume should be greater than or equal to 150 mL with no leak present. If used noninvasively, leak configuration means that there is no exhalation valve used — there is a known leak in the patient system (e.g. a vented mask). 3-16 Service Manual Theory of Operation 3.6.6 FiO2 for Various Oxygen and Ventilator Settings Figure 3-3 contains a chart showing the relationship between oxygen flow and inhaled flow for various oxygen concentrations and PEEP settings for the Puritan Bennett 520 Ventilator. Figure 3-3. FiO2 for Various Oxygen and Ventilator Settings x O2 flow (l/min) y Inhalation flow (l/min) Inhalation flow (L/min) = volume (L) x 60 / inspiratory time (s) Note: Tests conducted in a valve configuration. Results can vary according to whether the circuit is configured with or without a valve and patient lung characteristics. WARNING The Puritan Bennett 520 Ventilator can be used with an oxygen analyzer with minimum and maximum concentration alarms. Always measure the delivered oxygen with a calibrated oxygen analyzer that features a minimum and maximum concentration alarm in order to ensure that the prescribed oxygen concentration is delivered to the patient. Service Manual 3-17 Theory of Operation This page intentionally blank 3-18 Service Manual 4 Alarms and Troubleshooting This chapter provides information on how to view and respond to alarms and technical faults and suggests ways to troubleshoot the Puritan Bennett™ 520 Ventilator The ventilator responds to fault conditions with two types of alarms: • technical faults • ventilation alarms. Technical faults indicate conditions that do not immediately affect ventilator operation, but need correcting to restore proper ventilator function. Technical faults do not produce audible alarms but are recorded in the ventilator’s Technical Fault log which is accessed through the Faults Check menu in Maintenance mode. A service technician is required to correct technical faults. Ventilation alarms are those that audibly and visually alert the user to degraded patient conditions or a ventilator malfunction and require immediate attention. When this type of alarm occurs, a message appears on the LCD panel and is recorded in the ventilator’s alarm log. Many ventilation alarm limits are adjustable and are set after entering the patient’s ventilation parameters. (Refer to the Alarm settings section of Table 2-4 for a list of adjustable alarms.) Other ventilation alarms, such as AC power disconnection and low battery cannot be adjusted. Most ventilation alarm conditions can be responded to and corrected by the clinician or caregiver. In some cases, however, ventilation alarms can indicate problems with the ventilator hardware or patient circuit. See Section 4.4.2 for information on troubleshooting these types of ventilation alarms. 4.1 Alarm Classification Alarms are classified according to how their causes affect ventilator operation. Table 4-1 lists alarm classifications and associated ventilator responses. 4-1 Alarms and Troubleshooting Table 4-1. Alarm Priority Classification Classification Very High Priority (VHP) Effect on ventilation and ventilator response No ventilation. Depending upon the cause, the ventilator always generates a continuous audible alarm at maximum volume and the following indicators may or may not be displayed: • • • High Priority (HP) Medium Priority Compromised ventilation. Ventilator responds with: • a repeating series of 3 beeps then 2 beeps at the user-selected volume • red flashing LED illumination • alarm message • illuminated backlight. Note: If the cause of an alarm is not corrected‘, and if the Alarm Control key is not pressed within 60 seconds of an alarm trigger, high priority alarms will sound at the maximum volume. Ventilation not immediately affected, but could harm patient if left uncorrected. Ventilator responds with: • • • • Low Priority 4-2 red continuously lit LED alarm message displayed on ventilator screen illuminated backlight. a repeating series of 3 beeps at the user-selected volume yellow flashing LED illumination alarm message illuminated backlight. There are currently no Low Priority alarms Service Manual Alarms and Troubleshooting 4.2 How to Respond to Alarms When an alarm condition is detected, visual and audible indicators occur according to the alarm classification described in Table 4-1. The alarm display message appears only on the ventilator parameters or alarm settings menus Figure 4-1. Figure 4-1. Alarm display messages Ventilator parameters menu Alarm settings menu Alarm message area If multiple alarms occur at the same time, the LED indicator and alarm sound of the highest priority alarm takes effect, but messages for all active alarms scroll in succession. 4.2.1 How to Pause the Audible Portion of an Alarm To pause the audible alarm (audio paused): Press the ALARM CONTROL key once. This pauses the audio portion of the alarm for all active alarms for up to 60 seconds and displays the Audio Paused symbol on the screen (Figure 4-2). The ALARM CONTROL key also pauses the audible portion of a remote alarm (nurse call) for 60 seconds if connected. Alarm messages and LED indicators remain active during this 60-second period. The Audio Paused period expires after 60 seconds or immediately, when a new alarm condition is detected. Service Manual 4-3 Alarms and Troubleshooting Figure 4-2. Alarm Settings Menu During Audio Paused Period Audio paused symbol 4.2.2 How to Pause an Alarm Most alarms are automatically cleared as soon as the conditions causing them no longer exist. The exceptions are the Apnea alarm, which clears after two patient breaths, and the High Pressure alarm, whose LED indicator and alarm message remain active after the high pressure condition is corrected. Some alarms, however, can be paused manually even if the cause of their activation remains (these alarms are identified in Table 4-3.) To manually pause an alarm (alarm paused): Press the ALARM CONTROL key twice. The alarm sound and LED indicator are suspended and the Alarm Paused symbol appears at the top right of the Ventilator Parameters and Alarm Settings s screens (Figure 4-3). The alarm message disappears from the Ventilator Parameters screen. When no other alarms are currently active, the last alarm paused appears continuously in the alarm message window in the Alarms Settings menu, along with the date and time of its activation. 4-4 Service Manual Alarms and Troubleshooting Figure 4-3. Alarm Settings Menu During Alarm Paused Condition Alarm paused symbol 4.2.3 How to Reactivate a Paused Alarm Alarms whose causes continue to exist can be reactivated so that audible and visual indicators are restored. To reactivate a paused alarm: 1. If not currently displayed, press the MENU key to access the Alarm Settings menu. 2. Press the DOWN or UP arrow key to place the cursor at the “Alarm Log” position. 3. Press the ENTER key to confirm your selection. The alarm log screen appears (Figure 4-4). Service Manual 4-5 Alarms and Troubleshooting Figure 4-4. Alarm Log Screen (with and without alarms in the log) 4. Press the UP key to place the cursor at the “REACTIVATE PAUSED ALARM” position. 5. Press and hold the ENTER key for at least three (3) seconds. The following events occur: • • • • a beep tone sounds the alarm sounds the alarm LED indicator flashes the messages of all active alarms are displayed in succession in the Ventilation Parameters and Alarm Settings menus • the Audio Paused symbol disappears (if it was displayed) • the Alarm Paused symbol disappears. 6. Exit the alarm log screen by pressing the DOWN arrow key to place the cursor at the “Back” position. 7. Press the ENTER key to confirm your selection. The display returns to the Alarms Settings menu. 4.2.4 Alarm Reset Function The Alarm Reset function applies only to the High Pressure alarm. A High Pressure alarm occurs when the inspiratory pressure exceeds the high pressure alarm threshold set in the Alarm Settings menu. During a high pressure condition, the audible High Priority alarm sounds, the red LED flashes, and an alarm message displays on the screen, flashing in inverse video. If the high pressure condition corrects itself, the audio portion of the alarm resets (becomes silent), but the red LED and the alarm message remain flashing. To manually reset the High Pressure alarm, which turns off the illuminated LED and clears the flashing alarm message, press the ALARM CONTROL key twice. 4-6 Service Manual Alarms and Troubleshooting 4.3 How to Access Stored Ventilator Diagnostic Logs The Puritan Bennett 520 Ventilator stores information about its performance that can be used to troubleshoot and correct ventilator malfunctions. The Alarm, Technical Fault, and Event logs provide this information. The Alarm and Technical Fault logs are viewed directly from the ventilator screen. Additionally, the Event log can be downloaded to a PC. Contact your Covidien service representative for more information. The Alarm, Technical Fault, and Event logs are stored in non-volatile memory on the CPU PCBA, ensuring that the information is retained when the ventilator is powered off and during power loss conditions. 4.3.1 Alarm Log The Alarm log can be viewed from the ventilator screen when the ventilator is in standby mode or ventilation mode. This log displays up to eight (8) of the most recent ventilation alarms, including the date and time of occurrence (Figure 4-4). To view the Alarm Log screen: 1. Follow steps 1-3 of Section 4.2.3. The alarms appearing in the log are described in Table 4-3. To exit the Alarm Log screen, use the UP or DOWN arrow key to place the cursor at the “Back” position and press the ENTER key. The Alarm Log screen is dismissed automatically when a new alarm occurs, or after 15 seconds if no key is pressed. 4.3.2 Technical Fault Log The Technical Fault log can be viewed when the ventilator is in Maintenance mode, and displays up to nine (9) of the most recent technical faults including date and time of occurrence, and machine hours. A list of technical faults is provided in Table 4-2. If the software lock is enabled (a key symbol appears in the upper left corner of ventilator screen), you must disable it before you can view the technical fault log. To unlock the ventilator software: 1. Simultaneously press and hold the UP and DOWN arrow keys for 3 seconds. The key symbol in the upper left corner of the display disappears, indicating that the software is unlocked. To enter Maintenance mode and view the technical fault log: 1. If the ventilator is ventilating, stop ventilation via the Ventilation ON/OFF key prior to turning the ventilator power switch OFF (O). Service Manual 4-7 Alarms and Troubleshooting 2. Press and hold the ALARM CONTROL key while simultaneously switching the ventilator to the ON (I) position. Continue holding the key until the Setup screen appears. 3. Use the UP or DOWN key to place the cursor at the Maintenance position. 4. Press the ENTER key. The maintenance screen appears (Figure 4-5). The Maintenance screen displays the CPU and Power management CPU software versions, number of ventilator hours, serial number, and a menu of checks and calibrations designed to troubleshoot and verify the performance of the ventilator. Figure 4-5. Maintenance Screen 5. After entering Maintenance mode, the cursor’s default position is Faults Check. Press the ENTER key to view the list of technical faults (Figure 4-6). If there are no technical faults in memory, the message “NO DATA” appears on the screen. 4-8 Service Manual Alarms and Troubleshooting Figure 4-6. Faults Screen With No faults Present 4.3.3 Event Log An event log, capable of storing up to 5000 entries, is maintained in the ventilator’s nonvolatile memory. After 5000 entries are stored in the event log, the ventilator overwrites the data using a first-in-first-out (FIFO) strategy. The event log stores the following information: • • • • ventilation starts and stops confirmed ventilator parameter settings confirmed alarm settings alarm and technical fault occurrences with associated actions such as audio paused, alarm reset, and alarm paused actions, and acknowledgment key presses. Each event is identified by its name, the type of event (technical fault or alarm event), a description of the event, and a date and time stamp. The event log records any changes to the system's real-time clock by logging the current date/time followed by the new date/time and a unique event code indicating the change. 4.4 Troubleshooting This section provides guidance on how to troubleshoot and correct technical faults and ventilation alarm conditions that may have been caused by hardware or patient circuit malfunctions. Table 4-2 lists technical fault error codes and Table 4-3 lists possible ventilation alarm messages along with suggested troubleshooting steps. Service Manual 4-9 Alarms and Troubleshooting WARNING Some troubleshooting steps require you to work with exposed electronics connected to AC or battery power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools (except for electrical measuring devices such as a DMM) from touching electrical components. 4.4.1 Troubleshooting Technical Faults Access the technical fault log using the information provided in Section 4.3. Table 4-2. Technical Fault Error Troubleshooting Guide Error code 4-10 Description Troubleshooting steps n01 Constant flow for 1 minute; faulty inspiratory flow sensor 1. Calibrate inspiratory flow sensor (see Section 6.9.3). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). n02 Inspiratory flow sensor calibration fault 1. Calibrate the inspiratory flow sensor (see Section 6.9.3). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). n04 Internal valve (exhalation solenoid valve) pressure sensor calibration fault 1. Calibrate internal valve pressure sensor (see Section 6.9.2). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). n05 Internal pressure sensor calibration fault 1. Calibrate internal pressure sensor (see Section 6.9.2). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). Service Manual Alarms and Troubleshooting Table 4-2. Technical Fault Error Troubleshooting Guide Error code Service Manual Description Troubleshooting steps n06 Abnormal turbine speed measurementDefect sensor speed 1. Perform Flow Sensor Capacity test (see Section 6.10). 2. Check that the turbine motor wiring harness is connected to the turbine control PCBA (J2), and that the cable between the turbine control PCBA (J22) and the CPU PCBA (J4) is connected. 3. Verify 24V is present on the turbine control PCBA connector J1 pin1 (-) and pin 2 (+). 4. Verify 24V output on Power Management PCBA [connector J9, pin 1 (-) and pin 2 (+)] 5. Check fuse F1 on turbine control PCBA. Replace if necessary. 6. Replace turbine control PCBA/CPU cable. 7. Replace turbine (see Section 5.7.15). 8. Replace turbine control PCBA (see Section 5.7.16). 9. Replace CPU PCBA (see Section 5.7.9). n07 Loss of clock parameters. 1. Reset the date and time (see Section 2.12). 2. Replace the 3V battery on the CPU PCBA (see Section 5.7.11). 3. Replace CPU PCBA (see Section 5.7.9). n08 Proximal pressure sensor calibration fault. 1. Calibrate proximal pressure sensor (see Section 6.9.1). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Verify proper tubing connections. 4. Replace CPU PCBA (see Section 5.7.9). n09 Negative proximal pressure measurement for 15 seconds. 1. Calibrate proximal pressure sensor (see Section 6.9.1). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). 4-11 Alarms and Troubleshooting Table 4-2. Technical Fault Error Troubleshooting Guide Error code Description Troubleshooting steps n10 Negative internal pressure measurement for 15 seconds. 1. Calibrate internal pressure sensor (see Section 6.9.1). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). n11 Negative internal valve (exhalation solenoid valve) pressure measurement for 15 seconds. 1. Calibrate internal valve (see Section 6.9.2). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Check the voltage across the exhalation solenoid valve (J19) connector pins on CPU PCBA. If 24 V is not present, replace exhalation solenoid valve (see Section 5.7.8), otherwise replace CPU PCBA (see Section 5.7.9) n12 Loss of memory event pointers. 1. Replace CPU PCBA (see Section 5.7.9). 4.4.2 Troubleshooting Ventilation Alarm Messages Table 4-3 lists possible ventilation alarm messages (in alphabetical order), alarm detection method and ventilator response, priority and whether they respond to the audio paused and/or alarm paused functions and suggests troubleshooting steps for possible hardware or patient circuit causes. See the Puritan Bennett™ 520 Ventilator Clinician’s Manual for appropriate responses to alarms when the ventilator is being used on a patient. The alarm message text shown appears when you have configured the ventilator for English in the SETUP menu. If medium, high, or very high priority is listed for an alarm, the priority refers to the alarm LEDs and tones. Very high priority means the red alarm LED is continuously illuminated with a continuous alarm tone, and ventilation stops. High priority means the red alarm LED flashes with five alarm tones, and medium priority means an orange LED flashes with three alarm tones. If the ventilator gives a visual priority, then no LED is illuminated nor do alarm tones annunciate. Only an alarm message appears on the screen. Some alarm messages appear with an asterisk (*) after the first part of the message and before the second part of the message. This indicates that an alarm message contains more information than can be displayed on a single screen. These messages scroll to display the additional information. Access the alarm log using the information provided in Section 4.3. Note: All alarm messages listed are in US English language as set in Preferences Menu. 4-12 Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Medium Priority/ Yes/Yes 1. Verify the presence of AC power at the wall outlet. 2. Check the continuity of the AC power cord. 3. If AC LED is illuminated, check the voltage across the 24V fuse (FU2) on the CPU PCBA. If voltage is correct, consider replacing CPU PCBA (see Section 5.7.9). If voltage is incorrect, consider replacing Power Management CPU PCBA (see Section 5.7.18). Medium Priority/ Yes/ Yes 1. Check ventilator operation using a known good patient circuit and test lung. 2. Replace the inlet air filter (see Section 5.7.1). 3. Verify flow and pressure sensor calibration (see Section 6.9). Calibrate as necessary. 4. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. Loss of AC power • If CHECK SUPPLY alarm is OFF, immediately detected. If CHECK SUPPLY alarm is ON, detected after 5 seconds if ventilation is stopped or • AC POWER DISCONNECTION Detected at the start of inspiration when ventilation is in progress. Ventilator response: Switch to external DC power supply if present, otherwise to internal battery. Automatically clears when AC power returns. No inspiratory trigger detected by the ventilator and Apnea setting in Preferences menu is set to YES Apnea occurs in PSV ST and CPAP APNEA Service Manual Troubleshooting steps 4-13 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Detection of a fault in the internal battery. Ventilator response: Internal battery is disabled from use. A - symbol appears beside the battery symbol instead of remaining internal battery capacity. BATTERY FAULT1 RESTART/SRVC 4-14 Medium Priority/ Yes/Yes Troubleshooting steps 1. Try to operate the ventilator on internal battery only (unplug from AC power). If the ventilator does not run, replace battery. If ventilator runs proceed to step 2. 2. Check the battery voltage using the Internal Battery Menu in the Measurements Check screen in Maintenance mode (see Section 6.6). If displayed battery voltage is greater than upper battery voltage spec limit (29.4 V +/- 1%) remove battery (see Section 5.7.4) and measure voltage. If measured voltage is less than displayed voltage, check the 24 V output (J7) pin 1 (-) and pin 3 (+) of the power management PCBA. If 24 V output is out of range, consider replacing CPU PCBA (see Section 5.7.9) or Power management PCBA (see Section 5.7.18). If displayed battery voltage is below 25V, remove the battery and measure voltage. Replace battery if voltage is less than 25 V (see Section 5.7.4). Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message BATT FAULT1 RESTART/SRVC How detected/ventilator response Detection of a fault in the internal battery. Ventilator response: Internal battery is disabled from use. A - symbol appears beside the battery symbol instead of remaining internal battery capacity. Occurs when there is a hardware fault with the internal battery. (cont.) Priority/ Audio paused/ Alarm paused Medium Priority/ Yes/No 3. If displayed battery voltage is below 25V but measured battery voltage is > 28 V, check the voltage at connector J10, pins 1 (-) and 9 (+) on the Power Management PCBA. If this measurement matches the measured battery voltage, consider replacing Power Management PCBA (see Section 5.7.18), otherwise replace Battery Connection PCBA (see Section 5.7.20). Medium Priority/ Yes/No 1. Install a battery. 2. Replace Battery Connection PCBA (see Section 5.7.20). 3. Replace Power Management PCBA (see Section 5.7.18). No internal battery detected. BATT FAULT2 RESTART/SRVC Service Manual Ventilator response: A - symbol appears beside the battery symbol instead of remaining internal battery capacity. Troubleshooting steps 4-15 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Medium Priority/ Yes/No 1. Inspect battery. If Puritan Bennett battery is installed, replace with a new Puritan Bennett battery. If a nonPuritan Bennett battery is installed, replace with a Puritan Bennett battery (see Section 5.7.4). 2. If the incorrect battery is installed, replace with a Puritan Bennett battery (see Section 5.7.4). 3. Replace Power Management PCBA (see Section 5.7.18). 4. Replace CPU PCBA (see Section 5.7.9). Medium Priority/ Yes/Yes 1. Check internal battery capacity by running the measurement check (see Section 5.6.4). 2. Replace Power Management PCBA (see Section 5.7.9). Immediately detected if ventilator does not recognize the battery as a Puritan Bennett- supplied battery or the battery is incorrect for the Puritan Bennett 520 Ventilator. BATT FAULT3 RESTART/SRVC Internal battery charging circuit fault detected. BATTFAULT 4 4-16 Ventilator response: Internal battery does not charge. Troubleshooting steps Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Battery temperature out of tolerance. Ventilator response: Battery charging stops. BATT TEMP FAULT* Service Manual Medium Priority/ Yes/Yes Troubleshooting steps 1. Check battery temperature displayed on Internal Battery menu in Measurements Check menu of Maintenance mode (see Section 5.6.4). If temperature > 104F (40C) or < 41F (5 C), move device to cooler or warmer location as appropriate. 2. Verify internal fan is operating. 3. Consider replacing • Power Management PCBA (see Section 5.7.18) • CPU PCBA (see Section 5.7.9) • Battery (see Section 5.7.4) 4-17 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Tidal volume during exhalation < 40% of inspired tidal volume and inspired tidal volume > 20 mL. High Priority/ Yes/No 1. Check ventilator operation with a known good patient circuit. 2. Re-calibrate internal valve pressure sensor (see Section 6.9.2). 3. Re-calibrate inspiratory flow sensor (see Section 6.9.3). 4. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 5. Verify integrity of inspiratory block. Replace if necessary (see Section 5.7.12). 6. Replace CPU PCBA (see Section 5.7.9). High Priority/ Yes/No 1. Re-calibrate internal valve pressure sensor (see Section 6.9.2). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Check the voltage across the exhalation solenoid valve (J19) connector pins on CPU PCBA. If 24 V is not present, replace exhalation solenoid valve (see Section 5.7.8), otherwise replace CPU PCBA (see Section 5.7.9). Exhalation valve obstructed. Activation: after 15 s in P A/C or PSV ST. CHECK/CHANGE EXH VALVE1* CHK EXH VALVE PRESSURE Valve pressure < 1.5 cmH2O at ventilation start. Activation: At the first breath in P A/C and PSV ST. 4-18 Troubleshooting steps Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message CHECK PROXIMAL LINE 1* How detected/ventilator response • Occurs when proximal line is not connected at start of ventilation. Loss of signal from the proximal pressure sensor after one ventilation cycle or • No signal detection from the proximal pressure sensor after 17 seconds in P A/C mode or after Apnea Time + 4 seconds in PSV ST mode Priority/ Audio paused/ Alarm paused Medium Priority/ Yes/No Troubleshooting steps 1. Re-calibrate proximal pressure sensor (see Section 6.9.1). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). Ventilator response: Switch to internal pressure sensor for pressure measurement. Proximal pressure < 0.6 cmH2O for 100 ms during inspiration phase of 2nd breath cycle Ventilator response: Switch to internal pressure sensor for pressure measurement. • CHECK PROXIMAL LINE2* Occurs when proximal line is not connected during ventilation. Loss of signal from the proximal pressure sensor after one ventilation cycle or Medium Priority/ Yes/No 1. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 2. Re-calibrate proximal pressure sensor (see Section 6.9.1). 3. Replace CPU PCBA (see Section 5.7.9). • No signal detection from the proximal pressure sensor after 17 seconds in P A/C mode or after Apnea Time + 4 seconds in PSV ST mode. Ventilator response: Switch to internal pressure sensor for pressure measurement. Failure of remote alarm relay circuit. CHECK REMOTE ALARM Service Manual Medium Priority/ Yes/Yes 1. Perform remote alarm test (see Section 6.13).I f test fails, replace CPU PCBA (see Section 5.7.9). 4-19 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Immediately detected upon loss of memorized parameters or after installation of a new ventilator software version.or Setting out of range CHECK SETTINGS Priority/ Audio paused/ Alarm paused Medium Priority/ Yes/Yes or loss of SETUP menu settings Ventilator response: Deactivates software lock; out-of-range settings replaced by default values CONNECT VALVE OR CHANGE PRESS Occurs at ventilation start in PC or PSV ST when pressure settings match operation with exhalation valve configuration but the exhalation valve is not detected. High Priority/ Yes/No CONTROLLED CYCLES The ventilator is delivering apnea ventilation at the set backup rate. N/A CPAP MODE Occurs when CPAP ventilation is started and an exhalation valve is used. High Priority/ Yes/No Internal pressure sensor signal constant (± 0.5 cmH2O) for 15 seconds. DEVICE FAULT1 RESTART/SRVC RESTART/SRVC 4-20 1. Re-enter ventilation parameters. 2. Turn ventilator off and back on again to verify memory. If settings are not retained, replace CPU PCBA (see Section 5.7.9). 1. Install or replace exhalation valve. 2. Calibrate internal valve pressure transducer (see Section 6.9.2). 3. Replace CPU PCBA (see Section 5.7.9). N/A 1. Remove exhalation valve. High Priority/ Yes/No 1. Re-calibrate internal pressure sensor (see Section 6.9.2). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). Medium Priority/ Yes/Yes 1. Re-calibrate proximal pressure sensor (see Section 6.9.1). 2. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator. 3. Replace CPU PCBA (see Section 5.7.9). Proximal pressure sensor signal constant (± 0.5 cmH2O) for 15 seconds DEVICE FAULT2 Troubleshooting steps Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused High Priority/ Yes/No 1. Check 24V output at connector J9 pin 1 (-) and pin 2 (+) on Power Management PCBA. If 24 V not present, replace Power Management PCBA (see Section 5.7.18). Medium Priority/ Yes/Yes 1. Verify fan spins freely. Replace if necessary (see Section 5.7.19). 2. Verify 24 V output at fan connector (J6). If voltage is incorrect, replace Power Management PCBA (see Section 5.7.18). 3. Replace CPU PCBA (see Section 5.7.9). 24 V failure DEVICE FAULT3 RESTART / SRVC Ventilator cooling fan operating speed is not appropriate for the internal device temperature DEVICE FAULT 4 RESTART/SRVC Detection of a fault in the electrical power supply system. DEVICE FAULT5 RESTART / SRVC Service Manual Ventilator response: A - symbol appears beside the battery symbol instead of remaining internal battery capacity Troubleshooting steps Medium Priority/ Yes/Yes 1. Replace Power Management PCBA (see Section 5.7.18). 4-21 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Turbine speed too low coupled with high internal temperature. Ventilator response: ventilation stops within five seconds; oxygen solenoid valve closes High Priority/No/ No DEVICE FAULT6 RESTART / SRVC High Priority/ Yes/No 1. Consider replacing: • Power Management PCBA (see Section 5.7.18). • CPU PCBA (see Section 5.7.9). Inspiratory flow is constant (±-1 lpm) with normal turbine temperature and speed conditions HP/Yes/No 1. Recalibrate inspiratory flow sensor (see Section 6.9.3). 2. Consider replacing CPU PCBA (see Section 5.7.9). DEVICE FAULT7 DEVICE FAULT8 4-22 1. Verify electrical connection at J1 on Turbine control PCBA and that 24 V is present. If not present consider replacing: • Power Management PCBA (see Section 5.7.18) • Turbine control PCBA (see Section 5.7.16) 2. Check the fuse, F1, on the turbine control PCBA. If fuse is blown, replace turbine control PCBA (see Section 5.7.16). 3. Check connection and cable between turbine control PCBA and CPU PCBA. Replace cable if necessary. 4. Replace turbine (see Section 5.7.15). 5. Replace CPU PCBA (see Section 5.7.9). CPU 5 V reference voltage < 4.5 V or 10 V reference voltage < 9 V RESTART / SRVC RESTART / SRVC Troubleshooting steps Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message DEVICE FAULT9 RESTART/SRVC DEVICE FAULT10 RESTART/SRVC DEVICE FAULT11 RESTART/SRVC DEVICE FAULT12 RESTART/SRVC DEVICE FAULT13 RESTART/SRVC How detected/ventilator response Priority/ Audio paused/ Alarm paused Troubleshooting steps RAM error during POST Very High Priority/No/ No 1. Consider replacing CPU PCBA (see Section 5.7.9). Flash memory checksum error during POST Very High Priority/No/ No 1. Consider replacing CPU PCBA (see Section 5.7.9). EEPROM error during POST Very High Priority/No/ No 1. Consider replacing CPU PCBA (see Section 5.7.9). Reference voltage error during POST Very High Priority/No/ No 1. Consider replacing CPU PCBA (see Section 5.7.9). Software does not carry the LS xxxxxx designation. Very High Priority/No/ No 1. Contact your local Covidien service representative. High Priority/No/ No 1. Charge the battery by connecting the device to AC power. 2. Replace the battery (see Section 5.7.4). 3. Replace battery connection PCBA (see Section 5.7.20). 4. Replace Power Management PCBA (see Section 5.7.18). Activation: At ventilator startup during POST. Ventilator response: Ventilation prohibited. Internal battery capacity < 10 min. or 3% (battery voltage < 22.5 V) Ventilator response: Ventilation stops immediately EMPTY BATTERY ERASE ERROR TECHNICAL PROBLEM Service Manual Occurs if the memory erase operation on USB memory device fails. Visual priority/No/ No N/A 4-23 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Device internal temperature out of tolerance range. (> 60oC) Medium Priority/ Yes/Yes HIGH TEMP COOL VENT* INCOMPATIBLE SOFTWARE VERSION Occurs at startup when a hardware problem is detected on CPU PCBA memories or critical CPU functions. Also occurs on start up after software download with corrupted software or with software that is not suitable for the Puritan Bennett 520 Ventilator. High Priority/ No/No INTENTIONAL VENT STOP Detected when ventilator is voluntarily stopped and alarm is set to YES in Preferences menu. High Priority/ Yes/Yes KEYPAD FAULT Key pressed for more than 45 seconds (stuck key). RESTART / SRVC 1. Contact your local Covidien representative. N/A 1. Replace keypad (see Section 5.7.7). 2. Replace CPU PCBA (see Section 5.7.9). High Priority/ Yes/No 1. Charge the battery by connecting the device to AC power. 2. Replace battery (see Section 5.7.4). 3. Replace battery connection PCBA (see Section 5.7.20). 4. Replace Power Management PCBA (see Section 5.7.18). (battery voltage < 25 V) 4-24 1. Check device internal temperature on the Measurements Check menu in Maintenance mode (see Section 5.6.4). If displayed temperature > 140°F (60°C), move device to cooler location. 2. Replace Power Management PCBA (see Section 5.7.18) 3. Replace CPU PCBA (see Section 5.7.9). High Priority/No/ No Internal battery capacity < 30 min. or 8% LOW BATTERY Troubleshooting steps Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Activates if one of the following conditions remains for 15 s or Apnea Time + 2 seconds, whichever is greater: • LOW PRESSURE DISCONNECT* NO BATTERY DETECTED • Inspiratory flow > 130 lpm during the inspiratory phase or In PSV ST and CPAP modes patient pressure < (inspiratory pressure set point) - 20%. Immediately detected when no battery is installed High Priority/ Yes/No Medium Priority/ Yes/No Less than 20 mL of inspired tidal volume and P Support or Pi -20% < Pi < P Support or Pi+20% measured for three consecutive breaths in PSV ST and P A / C modes. Note: A high respiratory rate or back up respiratory rate may not sufficiently flush out CO2 in some vented pediatric masks. OCCLUSION CHECK CIRCUIT* Service Manual High Priority/ Yes/No Troubleshooting steps 1. Re-calibrate the patient and internal pressure sensors (see Section 6.9.1). 2. Verify all internal tubes are connected properly to their respective sensors. 3. Check for n06 technical fault. If present, replace turbine (see Section 5.7.15). 4. Replace CPU PCBA (see Section 5.7.9). Install Covidien approved battery. 1. Check that there are no leaks or obstructions in the pneumatic tubes inside the ventilator or in patient circuit. 2. Ensure the patient circuit matches the set ventilator preference (Use pediatric circuit when pediatric circuit preference set to YES; use adult circuit when Pediatric circuit preference set to OFF). 3. Switch to a vented system with a larger leak configuration. 4. Re-calibrate inspiratory flow sensor (see Section 6.9.3). 5. Replace CPU PCBA (see Section 5.7.9). 4-25 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Loss of external DC power. Medium Priority/ Yes/Yes 1. Verify the voltage at the external power source and re-charge as necessary. 2. If DC source has power available, but DC LED is not illuminated, replace Power Management PCBA (see Section 5.7.18). 3. If DC LED is illuminated, remove the fuse and check continuity (FU2 on the CPU PCBA). If continuity is good, replace CPU PCBA (see Section 5.7.9). 4. If 24 V not present, replace Power Management CPU PCBA (see Section 5.7.18). Medium Priority/ Yes/Yes 1. Replace Power Management CPU PCBA (see Section 5.7.18). 2. 2. Replace CPU PCBA (see Section 5.7.9). Activation: After 5 seconds if ventilation is stopped or at the start of inspiration when ventilation is in progress. Ventilator response: Switch to internal battery. ON INTERNAL BATTERY POWER FAULT RESTART/SRVC 4-26 A detection of a fault in the electrical power supply system. A- symbol displayed instead of battery capacity. Occurs when communication between CPU PCBA and Power Management PCBA is lost. Troubleshooting steps Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Electrical power interrupted when ventilation is in progress or POWER LOSS • Ventilator operating on internal battery and battery is fully discharged or • stopping the ventilator without using the I/O switch Ventilator response: Immediate loss of ventilation. Ventilation resumes after AC or DC power is restored or when I/O switch is turned on and vent is connected to AC power (no message) • REMOTE ALARM FAULT REMOVE VALVE REMOVE VALVE OR CHANGE PRESS Service Manual VHP/No/No Troubleshooting steps 1. Press the Alarm Control key to pause the audible alarm. 2. Turn the ventilator power switch back on to immediately resume ventilation. 3. Press and hold the Ventilation ON/OFF key for 3 seconds to stop ventilation. Confirm stop by pressing the Ventilation ON/OFF key again. 4. Insert a fully charged battery into ventilator. Failure of remote alarm relay circuit. Medium Priority/ Yes/Yes 1. Replace CPU PCBA (see Section 5.7.9). Occurs in CPAP if ventilator detects an exhalation valve is being used. High Priority/ Yes/No 1. Remove exhalation valve. Occurs in P A/C; PSV ST when pressure settings match operation with calibrated leak configuration but an exhalation valve is detected High Priority/ Yes/No 1. Remove exhalation valve. 4-27 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Detected when there is a hardware fault on the buzzer PCBA SPKR FAULT1 RESTART/SRVC 4-28 Medium Priority/ Yes/No Troubleshooting steps 1. Switch the ventilator off and switch it on again. If alarm persists go to Step 2. If alarm clears, the device is safe for use. 2. Switch the ventilator on (no need to ventilate) for 15 minutes. Switch the ventilator off and switch it on again. If the alarm does not trigger again, the device is safe for use. If alarm persists go to Step 3. 3. Switch the ventilator off and switch it on again in Setup mode and go to Maintenance menu. Go to the Measurements Check menu, place the cursor on Buzzer Voltage check, and press the Enter key. Buzzer should sound and voltage should be 1.8 V – 2.0 V ± 0.1 V. If the voltage is out of range low or reading 0 while sounding, go to Step 4. If voltage is within range, the device is safe for use. Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Medium Priority/ Yes/No 4. Open device and verify and/or reseat the Buzzer PCBA cable connection to the CPU PCBA. Retest the Buzzer Voltage in Maintenance Mode / Measurement Check (Per step 3, check buzzer voltage). If vent continues to fail go to Step 5. 5. Replace Buzzer PCBA (see Section 5.7.13). 6. Replace CPU PCBA (see Section 5.7.9). Medium Priority/ Yes/Yes Check watchdog voltage in Maintenance mode (see Section 6.6). If watchdog voltage >30 V, replace Power Management PCBA (see Section 5.7.18). If watchdog voltage < 30 V, replace CPU PCBA (see Section 5.7.9). High Priority/ Yes/No 1. Ensure the alarm switch is properly set. See Section 5.7.13 to properly set the switch. 2. Consider replacing Buzzer PCBA (see Section 5.7.13). If alarm persists, replace ventilator. Detected when there is a hardware fault on the buzzer PCBA. SPKR FAULT1 RESTART/SRVC (cont) SPKR FAULT2 RESTART/SRVC Watchdog (Power Fail Interrupt) voltage > 30 V. Failure detected in the watchdog circuitry which would prevent the Very High Priority alarm from audibly annunciating in the event of a loss of power during ventilation. Ventilator response: No audio signaling for Very High Priority alarms. SPKR FAULT3 RESTART/SRVC Service Manual Alarm battery charging failure (voltage < 4.8 V). Occurs when a hardware fault is detected on battery charger of the buzzer PCBA. Troubleshooting steps 4-29 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Alarm battery voltage < 4.8 V with no failure of alarm battery and alarm battery charging circuit. When this alarm occurs, the Power Supply Loss (VHP) alarm cannot annunciate in the event that the ventilator’s power switch (I/O) is turned off during ventilation. Re-sets when voltage > 4.9 V. SPKR FAULT4 RESTART/SRVC 4-30 Medium Priority/ Yes/Yes Troubleshooting steps 1. Switch the ventilator off and switch it on again. If alarm persists go to Step 2. If the alarm clears, the device is safe for use. 2. Switch the ventilator on (no need to ventilate) for 15 minutes. Switch the ventilator off and switch it on again. If the alarm does not trigger again, the device is safe for use. If alarm persists go to Step 3. 3. Check the orientation of the switch on the Buzzer PCBA (see Figure 5-20) and be sure that it is set to the left as shown. If ventilator continues to fail, go to Step 4. 4. Replace Buzzer PCBA (see Section 5.7.13). If alarm persists, replace ventilator. Service Manual Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message How detected/ventilator response Priority/ Audio paused/ Alarm paused Buzzer battery voltage < 4.8 V Medium Priority/ Yes/Yes SPKR LOW BATTERY TRANSFER ERROR KEY DISCONNECTION TRANSFER ERROR KEY FULL TRANSFER ERROR TECHNICAL PROBLEM Service Manual Troubleshooting steps 1. Switch the ventilator off and switch it on again. If the alarm clears, the device is safe for use. If alarm persists go to Step 2. 2. Switch the ventilator on (no need to ventilate) for 15 minutes. Switch the ventilator off and switch it on again. If the alarm does not trigger again, the device is safe for use. If the alarm persists go to Step 3. 3. Ensure the buzzer cable is seated properly in its connector on the CPU PCBA. 4. Check the orientation of the switch on the Buzzer PCBA (see Figure 5-20) and be sure it is set to the left as shown. If the ventilator continues to fail, go to Step 5. 5. Replace Buzzer PCBA (see Section 5.7.13). If alarm persists, replace ventilator. Occurs when USB memory device is disconnected during data transfer. Visual priority/No/ No N/A Occurs when USB memory device is full during data transfer. Visual priority/No/ No N/A Occurs if a data transmission failure occurs during transfer. N/A Visual priority/No/ No 4-31 Alarms and Troubleshooting Table 4-3. Ventilation Alarm Troubleshooting Guide (continued) Alarm message 4-32 How detected/ventilator response Priority/ Audio paused/ Alarm paused Troubleshooting steps N/A TRANSFER NOT ALLOWED INCOMPATIBLE SETTINGS Occurs on data transfer request from the USB memory device to the ventilator when the setting file to be imported is not suitable for the Puritan Bennett 520 Ventilator. Visual priority/No/ No TRANSFER NOT ALLOWED FILE NOT FOUND OR WRONG Occurs on data transfer request from the USB memory device to the ventilator when there is no setting file on the USB memory device or if file's data are corrupted. Visual priority/No/ No TRANSFER NOT ALLOWED REMOVE A KEY Occurs when more than one USB memory device is connected to the ventilator. Visual priority/No/ No TRANSFER NOT ALLOWED USB CAPACITY INSUFFICIENT Occurs when the USB key does not have enough memory to receive all data requested. N/A Visual priority/No/ No 1. If two USB keys are connected to the ventilator, remove one key. 1. Insert a USB key with larger storage capacity. Service Manual Alarms and Troubleshooting 4.4.3 Troubleshooting Miscellaneous Symptoms Table 4-4 provides information to troubleshoot faults that may or may not cause alarms or technical faults. Table 4-4. Miscellaneous Symptom Troubleshooting Guide Symptom Service Manual Troubleshooting steps AC, DC, and internal battery LEDs lit in the presence of a connected AC or DC power source. 1. Consider replacing CPU PCBA (see Section 5.7.9). LED indicating power source is not lit, but device functions. 2. Check that the keypad cable is correctly connected to connector (J1) on the CPU PCBA. Check for broken LEDs, damaged keypad cable. If LEDs are broken or cable damaged, replace keypad (see Section 5.7.7). 3. Replace CPU PCBA (see Section 5.7.9). Excessive heat from the ventilator 1. Check the air inlet for obstructions and clear if necessary. 2. Replace the inlet air filter (see). 3. Perform the Flow Sensor Capacity test (See Section 6.10). 4. Replace turbine (see Section 5.7.15). Whistling air sounds 1. Check that the inlet air filter is present. 2. Check for leaks in the oxygen connector and delivery tube. Replace tie wraps or connector or tube if necessary. 3. Replace turbine (see Section 5.7.15). LCD panel does not update or respond to key presses 1. Verify the software lock is unlocked (see Section 4.3.2 for instructions on how to unlock). 2. Ensure the LCD panel cable is connected properly to the CPU PCBA. 3. Replace keypad (see Section 5.7.7). 4. Verify the voltage across pins 21 (-) and 22 (+) of connector J17 on the CPU PCBA is 5 V. 5. Replace LCD panel (see Section 5.7.10). 6. Replace CPU PCBA (see Section 5.7.9in Chapter 5). Dark display or no display 1. Adjust display contrast and brightness. 2. If device is below specified operating temperature (See Table 2-3 for operating temperature specification), place in warmer environment. 3. Ensure the keypad cable is connected properly to the CPU PCBA. 4. Verify the voltage across pins 21 (-) and 22 (+) of connector J17 on the CPU PCBA is 5 V. 5. Replace LCD panel (see Section 5.7.10). 6. Replace CPU PCBA (see Section 5.7.9). Display backlight does not switch off during ventilation Set Backlight to OFF in Preferences menu. 4-33 Alarms and Troubleshooting Table 4-4. Miscellaneous Symptom Troubleshooting Guide Symptom Troubleshooting steps Alarm sound level too low or too high Adjust alarm volume level in Preferences menu. Poor display visibility Adjust contrast in Preferences menu. Corrupted characters on display Replace LCD panel (see Section 5.7.10). Condensation appears on screen 1. Open case, let air dry, and check for failures. 2. Replace keypad (see Section 5.7.7). 3. Replace LCD panel (see Section 5.7.10). Displayed barometric pressure does not fall within tolerance when compared with a calibrated standard barometer (fails barometric pressure test in Performance Verification). Replace CPU PCBA (see Section 5.7.9). Frequent inspiratory tidal volume alarms Ensure circuit type used (adult or pediatric) matches circuit type set in Preferences Menu 4.4.4 PCBA Test Points Some troubleshooting steps given in Section 4.4.2 and Section 4.4.3 require you to verify voltages at various test points. The following sections provide illustrations for each PCBA showing the referenced connectors and location of pin 1 on each connector, and list the nominal voltages expected at these test points. 4-34 Service Manual Alarms and Troubleshooting 4.4.4.1 CPU PCBA Top view Bottom view Service Manual 4-35 Alarms and Troubleshooting Reference Designator Reference Designator 1 FU2 2 J19 3 4-36 Comments 8 VALVE O2 Circled item number is the referenced pin of connector 9 J2 Circled item number is the referenced pin of connector 10 J18 J17 located beneath CPU LCD interface PCBA under LCD panel 11 J3 4 J17 5 J1 12 J4 6 J11 13 J7 7 J5 Connector Pin (-) Pin (+) Nominal voltage (V) J7 1 13 5 J19 2 1 24 FU2 N/A N/A 24 Service Manual Alarms and Troubleshooting 4.4.4.2 Power Management PCBA Service Manual 4-37 Alarms and Troubleshooting Reference Designator 1 J2 7 PROG EEP 2 J7 8 TURBINE Power management PCBA 3 4 4-38 Reference Designator Comments 10 5 Power Supply PCBA 6 Circled item number is the referenced pin of connector Power supply PCBA connector 9 F1 Comments VENTIL Fan connector Battery connection PCBA connector 11 Connector Pin(-) Pin (+) Nominal Voltage (V) J6 2 1 24 J7 1 3 24 J9 1 2 24 J10 1 9 27 J7 1 13 5 Service Manual Alarms and Troubleshooting 4.4.4.3 Turbine Control PCBA Reference Designator Service Manual Reference Designator 1 J3 4 2 J6 5 3 F1 Comments J1 Circled item number is the referenced pin of connector (for CPU PCBA harness) Connector Pin (-) Pin (+) Nominal Voltage (V) J1 1 2 24 F1 N/A N/A 24 4-39 Alarms and Troubleshooting This page intentionally blank 4-40 Service Manual 5 Service and Repair This chapter describes how to repair the major components of the Puritan Bennett™ 520 Ventilator and includes removal, replacement, and adjustment procedures. For a complete parts breakdown, including assembly drawings and part numbers, refer to Chapter 7. 5.1 Warnings WARNING When servicing the ventilator, be sure to familiarize yourself with, and adhere to all posted and stated safety warning and caution labels on the ventilator and its components, and on any service equipment and materials used. Failure to adhere to such warnings and cautions at all times may result in injury or property damage. To prevent patient injury, do not use a ventilator if it requires repair. To prevent personal injury or death, do not attempt any ventilator service while a patient, or other person, is connected to the ventilator. Use personal protective equipment whenever exposure to toxic fumes, vapor, dust particles, blood pathogens, and other transmittable diseases and hazardous material can be expected. If in doubt, consult an environmental health and safety specialist or an industrial hygienist before servicing the ventilator. Refer to Section 5.6.1 for cleaning procedure. To prevent electrical shock hazard and possible personal injury, always disconnect electrical power sources before servicing the ventilator. Follow accepted safety practices for electrical equipment when testing or making equipment, adjustment, or repairs. To prevent possible personal injury, always disconnect the oxygen source from the ventilator before service. Chemicals from a broken LCD panel are toxic when ingested. Use caution when handling a ventilator with a broken display panel. To prevent possible damage to the power supply, remove the battery from the ventilator (Section 5.7.4) during disassembly and reassembly. To prevent damage to electrostatic discharge (ESD) sensitive components, always follow ESD guidelines when servicing the ventilator. Adhere to ESD control techniques when repairing ESD sensitive components. Damage to components may occur due to overtightening of screws. Care should be taken during reassembly not to overtighten screws where instructed. 5-1 Service and Repair Use only recommended tools, test equipment, and service materials (see Table 2-14) when servicing the ventilator. As you repair the ventilator, perform any applicable cleaning and inspection procedures listed below. Visually inspect any removed ventilator parts, including those removed to gain access to a suspected faulty part. Inspect the exposed area behind the removed parts as well. Clean removed parts to facilitate further inspection as necessary. Investigate and determine the cause of any detected abnormality. Repair the unit or contact Covidien Technical Support for help in diagnosing unresolved symptoms. Replace or repair all parts that are worn, missing, damaged, cracked, corroded, burnt, warped, bent, disfigured, or broken. Consult Chapter 7 for parts availability. Covidien recommends that customers or technical services personnel follow local governing ordinances and recycling regulations regarding disposal or recycling of the ventilator, battery, or other device components. The repair instructions assume the patient system, humidifier, and oxygen source are already removed from the ventilator. In the repair procedures, PCBA reference designators for connectors and sensors are given in parentheses. For example, the reference designator for the Remote Alarm connector on the CPU PCBA is (J2); the reference designator for the exhalation valve pilot pressure sensor fitting is (1 VALVE). Do not start ventilation until you ensure the device is correctly assembled, that the air inlet filter is properly installed and unobstructed, and that there is proper clearance all around the unit. Also ensure the patient circuit is correctly connected to both the ventilator and the patient, and that the patient circuit, including all hoses, is not damaged or obstructed. 5.2 Electrical Cables and Pneumatic Tubing • To ensure proper reassembly, note or label wire and tube positions before disconnecting parts. Refer to the pneumatic cabling diagram label on the inside of the ventilator top housing or Figure 5-13 to correctly connect pneumatic tubes. • To avoid shredding a silicone tube when removing from a fitting, gently pull the tube while turning. • Make sure all tubes, and harnesses or cables, are installed using tie wraps where required. • Make sure wiring does not interfere with, and cannot be damaged by, hinged or moving ventilator parts. 5.3 Electrostatic Discharge Control It is important to follow ESD control procedures whenever the ventilator is repaired. Electrostatic discharge can permanently damage ESD sensitive microelectronic components or assemblies when they are handled, and even when no direct contact is 5-2 Service Manual Service and Repair made with the component or assembly. ESD damage may not be immediately detectable; however, ESD damage will show up at a later time. It can manifest as a premature catastrophic failure of a component or assembly, or as an intermittent failure, all of which can be difficult and costly to locate. 5.3.1 ESD Procedures and Precautions Follow these procedures and precautions to prevent ESD damage to the ESD-sensitive microelectronic components and assemblies in the Puritan Bennett 520 Ventilator. • Use a personnel-grounding system. Before opening the ventilator’s housings, ensure a personnel grounding system such as that listed in Table 2-14 (wrist strap, staticdissipative mat, and ground cord) is worn correctly and is properly connected to a reliable ground. • Follow correct procedures when using an antistatic mat. Place tools, test equipment, and the ESD sensitive device on the mat before starting repairs. Conduct all work on the mat. • Handle ESD sensitive components properly. Do not handle ESD sensitive component connection points, connector pins, leads, or terminals. • Keep nonconducting materials away from the work area. Static charges from nonconducting material, (i.e. plastic containers, foam cups, synthetic clothing, cellophane tape, etc.) cannot be removed by grounding. These items must be kept away from the work area when handling ESD sensitive devices. • Follow correct procedures for use of static-shielding bags. Store and transport all ESD sensitive devices in static-shielding bags at all times, except when being worked on. Never place more than one ESD sensitive device in a static-shielding bag. Never place static generating nonconducting material inside a static-shielding bag with an ESD sensitive device. Place any faulty ESD-sensitive devices in a static-shielding bag immediately after removal, to prevent additional damage. Close the bag to ensure the shield is effective. 5.4 Replacement Part Ordering Ordering correct parts requires proper identification of the ventilator version and part. To replace a part not stocked or unavailable, order the next higher assembly. Retain the part to be replaced until the replacement part is obtained, and compare the two for compatibility, if possible. Chapter 7 provides lists of orderable parts and assemblies. 5.5 Patient System and Accessories To service the patient system and accessories, refer to directions for use supplied with the patient system. Service Manual 5-3 Service and Repair 5.6 Service Prerequisites Before repairing the ventilator, perform the tasks in this section. 5.6.1 Cleaning The following cleaning guidelines pertain to parts that require cleaning while servicing the ventilator. Patient breathing circuits and parts listed in Table 2-2 are single patient use only, and should be disposed of when dirty. Do not clean or reuse these parts. Replace all parts that cannot be cleaned. Refer to Table 2-14 for recommended cleaning solutions. Note: • When cleaning reusable components, do not use hard brushes or other implements that could damage surfaces. • After you clean the components, inspect them for damage, such as cracks and crazing. Replace any damaged components. Note: Discard all parts removed from the ventilator during the maintenance procedures in accordance with your institution's protocol. Sterilize or disinfect parts before nondestructive disposal. Follow local governing ordinances and recycling plans regarding disposal or recycling of device components. 1. Clean ventilator exterior surfaces before disassembly. Table 2-14of this manual lists acceptable cleaning and disinfecting agents. • Use a clean, lint-free cloth, and squeeze excess liquid from the cloth. Do not allow excess cleaning liquids to enter the ventilator. • Allow cleaned ventilator parts and surfaces to air-dry. 2. If required upon ventilator disassembly, vacuum ventilator interior using ESD-safe equipment. Do not clean the ventilator interior or exterior surface with high-pressure air. 5.6.2 Labeling Checks Verify the presence of the following labels and replace if necessary: • • • • • inlet air filter label nurse call alarm label O2 inlet label identification label on the bottom of the ventilator inspiratory block labels (expiratory pilot pressure and proximal pressure label. 5.6.3 External Inspection 1. Inspect the external surfaces of the ventilator for damage. Replace if necessary. 2. Check that the handle fasteners are tight. Tighten if required (if missing, refer to Section 5.7.6 for replacement). 5-4 Service Manual Service and Repair 3. Verify the presence of the following items: screen • inlet air filter (if dirty, refer to Section 5.7.1 for replacement) • power switch (I/O) cover (if missing, refer to Section 5.7.2 for replacement) • four (4) feet on the bottom of the ventilator (if missing, refer to Section 5.7.3 for replacement) • all fasteners on the housing and battery compartment (replace as necessary). 5.6.4 Measurement Check This series of steps verifies various internal voltages, including the internal battery, checks the barometric pressure sensor, and tests the alarm buzzers. Note: Before running the Measurement check, warm up the ventilator for at least ten minutes in normal operation (ventilating) with alarms turned off and default parameters set. This is particularly important so that the blower will be at the correct temperature during the Measurement check. To perform the measurement check: 1. Disconnect any external DC power source, if present, and connect the ventilator to AC power. 2. Enter Maintenance mode (refer to Section 2.12 for instructions on how to enter Maintenance mode). 3. With the Maintenance screen displayed, use the UP or DOWN arrow keys to place the cursor at the Measurement Check position (Figure 5-1)and press the ENTER key. The Measurement Check screen appears (Figure 5-2). Service Manual 5-5 Service and Repair Figure 5-1. Selecting Measurement Check Figure 5-2. Measurement Check Screen 4. Ensure the values are within the limits in Table 5-1. 5-6 Service Manual Service and Repair Table 5-1. Specifications for Measurement Check Verification Parameter 24 V check Service Manual Specification Troubleshooting steps 24 V ± 0.5 V 1. Verify 24 V on connector J7 (see Section 4.4.4.2) 2. Ensure Power Management cable is connected properly and is not damaged. 3. Replace Power Management PCBA (see Section 5.7.18. 4. Replace CPU PCBA (see Section 5.7.9). Watchdog 24 V ± 0.5 V Replace CPU PCBA (see Section 5.7.9). Barometric pressure Ventilator barometer reading within ± 11 mmHg of reference barometer 1. Ensure no tubing is connected to the barometric pressure transducer. 2. Replace CPU PCBA (see Section 5.7.9). Internal temperature Internal temp 30 °C - 55 °C (86°F - 131 °F) 1. Move ventilator to a cooler location. 2. Ensure side and front cooling vents are not obstructed. 3. Ensure fan is operating properly. 4. replace Power Management PCBA (see Section 5.7.18.) Blower temperature Blower temp 35°C - 65°C (95°F - 149°F) 1. Warm up the ventilator for at least ten minutes in normal operation (ventilating) with alarms turned off and default parameters set. This is particularly important so that the blower will be at the correct temperature during the Measurements check. 2. Ensure turbine control cable is connected properly and not damaged. 3. Replace turbine. Buzzer Long beep sounds Buzzer voltage: 1.7 V - 2.1 V 1. Verify default parameters are set as listed in Table 6-6 on page 6- 37. It is particularly important that Key Sound is set to Accept tone in Preferences menu for correct buzzer voltage result. 2. Charge the buzzer battery by allowing ventilator to remain powered on and connected to AC power for at least 30 minutes and up to 2 hours. 3. Verify that PCBA-mounted switch on buzzer PCBA is set to OFF. 4. Replace Buzzer PCBA (see Section 5.7.13). 5. Replace CPU PCBA (see Section 5.7.9). Back-up buzzer Long beep sounds Replace CPU PCBA (see Section 5.7.9). Altitude Compensation Covidien recommends altitude compensation is always used (YES) N/A 5-7 Service and Repair Table 5-1. Specifications for Measurement Check Verification Parameter Specification Troubleshooting steps Internal battery menu Supplier Suppliers displayed If supplier is not displayed: 1. Power management software download if not version AL020002 or later. 2. Replace lithium-ion battery (see Section 5.7.4. First Use Date Record value N/A Theoretical capacity 2400 mAh If not 2400 mAh, Replace battery. Capacity 1920 mAh minimum If battery capacity is not at least 1920 mAh, replace battery (see Section 5.7.4). Cycles done N/A N/A Battery voltage 23.5 to 29.7 V 1. Connect ventilator to AC power source to charge battery. 2. Replace lithium-ion battery (see Section 5.7.4). 3. Inspect electrical contacts and proper connection of Battery Connection PCBA and battery for damage or oxidation. 4. Verify proper connection of Battery Connection PCBA and Power Management PCBA. 5. Replace Battery Connection PCBA (see Section 5.7.20). 6. Replace Power Management PCBA (see Section 5.7.18). Battery temperature 0 °C - 40 °C (32 °F - 104 °F) 1. Check for proper operation of fan. 2. Verify cooling vents in battery cover are not obstructed. 3. Replace lithium-ion battery (see Section 5.7.4.). 5. With the cursor at the Buzzer position, press the ENTER key. Verify: • alarm emits a long beep • buzzer voltage is 1.8 to 2.0 V ± 0.1 V. 6. Place the cursor at the Back-up buzzer position and press the ENTER key. Verify: • alarm emits a long beep. 7. Place the cursor at the Internal Battery Menu position and press the ENTER key. 5-8 Service Manual Service and Repair 8. Verify the displayed information as shown in Table 5-1. If the measurements check parameters are not as displayed in the table, refer to the Troubleshooting steps contained in that table. 9. When you have finished, place the cursor at the Back position and press the ENTER key to return to the Maintenance screen. 5.6.5 Review Technical Fault Log To review the technical fault log: 1. Enter Maintenance mode (refer to Section 2.12 for instructions on how to enter Maintenance mode). 2. Place the cursor at the Faults Check position and press the ENTER key. The Faults screen appears. If there are no faults in the fault log, the ventilator displays NO FAULTS. 3. To return to the Maintenance screen, place the cursor at the Back position and press the ENTER key. 5.7 Ventilator Repair This section describes how to remove major ventilator components. 5.7.1 Inlet Air Filter Removal and Replacement Caution • Check the cleanliness of the inlet air filter located on the rear of the ventilator and replace it if necessary before the recommended replacement period expires. Pay particular attention when the ventilator is installed on a wheelchair, as the environmental conditions may cause the filter to become dirty more rapidly. • Failure to replace a dirty inlet air filter or operating the ventilator without a filter may damage the ventilator. • The inlet air filter is not reusable. Do not attempt to wash, clean, or reuse it. To remove the inlet air filter: Grasp the center of the filter and pull outward (Figure 5-3). Service Manual 5-9 Service and Repair Figure 5-3. Removing the Inlet Air Filter To replace the inlet air filter: With the foam surface of the filter towards the ventilator, push the filter into position, tucking the corners into the housing opening. Ensure the filter is not distorted when installed. 5.7.2 Power Switch Cover Replacement WARNING To avoid eye injury when working with the cover spring, wear safety glasses when performing this procedure. To remove the power switch cover: 1. Grasp the cover with your thumb and forefinger and gently pull the cover, spring, and pin assembly away from the ventilator. To replace the power switch cover: 1. Place the pin through one hole in the switch cover and insert the spring onto the pin. Slide the pin through the other hole in the cover. The longer leg of the spring should be to the inside of the cover (Figure 5-4). 5-10 Service Manual Service and Repair Figure 5-4. Switch Cover, Spring, and Pin Detail the cover between your thumb and o the inside of the cover). 1 1 Long leg of spring to inside of cover 2 Rotate spring to 90° position 2. With the other hand, rotate the spring’s long leg to ready it for installation into the housing. 3. Slide your index finger under the spring’s leg and bring it to a 90° position (Figure 5-4). 4. Keeping the spring leg rotated, slide it into the housing opening immediately to the right of the left-most pin retainer (Figure 5-5). 5. Push the pin into the retainers making sure that the cover and spring are centered and the pin is seated in both retainers. 6. Lift and lower the cover to check that it operates correctly. Service Manual 5-11 Service and Repair Figure 5-5. Power Switch Cover Spring Position Detail 1 2 3 Pin retainer Insert spring into this opening Pin retainer 5.7.3 Adhesive Feet Removal and Replacement To remove the adhesive feet: 1. Turn the ventilator bottom side up and use pliers to pull each foot away from the housing. To replace the adhesive feet: 1. Clean the recess of the housing with isopropyl alcohol to remove old adhesive. 2. Peel the adhesive backing from the foot and press it into its recess (4 pl). 5-12 Service Manual Service and Repair 5.7.4 Battery Removal and Replacement WARNING • Ensure the ventilator is off and AC power is disconnected when removing or installing the battery. • • • • Do not open the battery for any reason. Use care to apply proper pressure on the battery cover when installing screws. To prevent possible damage to the power supply, remove the battery from the ventilator during disassembly and reassembly. To prevent possible damage following removal, cover battery terminals in nonconductive packaging to avoid shorting and to store the battery so that it cannot be damaged. To remove the battery: 1. Remove the three screws from the battery cover (Figure 5-6) using a T10 Torx® driver. 2. Pull the cover out of the lower housing. 3. Remove the battery from the cover. Figure 5-6. Removing/Replacing the Battery Battery contacts toward this corner Service Manual 5-13 Service and Repair To replace the battery: 1. Install the battery so that the terminals will make contact with the Battery Connection PCBA terminals when the cover and battery are installed into the lower housing. (Figure 5-6 shows the correct orientation of the battery.) 2. With the ventilator bottom side up, place the battery and cover together into the lower housing, ensuring the tabs on the cover fit into the recesses in the housing. Apply pressure to the battery cover while using a T10 Torx® driver to install the two screws at the rear cover (do not over-tighten). 3. Install the screw at the bottom of the cover. Note: Dispose of used batteries according to your local governing ordinances and recycling regulations. 5.7.5 Housing Disassembly and Assembly WARNING To prevent possible injury, always remove the battery before servicing the ventilator. To disassemble the top housing: 1. Place the ventilator bottom side up on the work surface, and remove the five screws that hold the housings together using a T20 Torx® driver (Figure 5-7). Be careful not to scratch the keypad window. 5-14 Service Manual Service and Repair Figure 5-7. Removing Top Cover 1 Housing screws (5 pl) 2 Exhalation cover Service Manual 5-15 Service and Repair 2. Turn the ventilator right side up and gently lift the top housing off the base and turn it right side down on the work surface. Be careful not to pull on the keypad flex circuit. 3. Disconnect the keypad flex circuit by lifting up on the keypad connector locking tab (J1) (located on the CPU PCBA) and sliding the circuit out of the connector (Figure 5-8). Figure 5-8. Disconnecting the Keypad Flex Circuit 4. Check for the presence of the following internal ventilator labels and replace if damaged or illegible: • pneumatic schematic label on the inside of the upper housing • Attention Caution label on the Power Management PCBA guard • ESD label inside the device at rear of lower housing. To reassemble the upper housing: 1. Slip the keypad flex circuit fully into connector J1 on the CPU PCAB and lock the connector. Caution To prevent possible damage, do not fold or crease the flex circuit. 2. Route the flex circuit into the space between the inspiratory block and the CPU PCBA. 3. Route any other wires so they do not become pinched between the housings, and place the top housing onto the ventilator base assembly, lining up the case halves. 5-16 Service Manual Service and Repair 4. Ensure the inspiratory block and exhalation cover (Figure 5-7) are properly seated in the lower and upper housings, and the inlet air filter is properly positioned in its slot with the white part of the filter facing toward the outside of the unit. Caution When reassembling the upper housing, avoid damage to the flex circuit by routing it inside the Buzzer PCBA and inspiratory block. 5. Hold the housings together and turn the ventilator bottom side up and install the five screws. Do not overtighten. To replace the upper housing: When replacing the upper housing, you must also install a new keypad and pneumatic diagram label if your housing did not come with these parts pre-assembled. Use the old housing as a reference for the label location (place label on curved inside surface of upper housing). 1. To install the pneumatic diagram label, clean the inside housing label surface with isopropyl alcohol using a lint-free wipe, then peel off the adhesive backing and position the label on the new housing. 2. Follow the steps in Section 5.7.7 to install the keypad, then reassemble the upper housing according to the instructions above. 5.7.6 Carrying Handle Removal and Replacement To remove the carrying handle: 1. Unscrew the two screws on the inside of the upper housing using a T20 Torx® driver. 2. Turn the upper housing over and remove the handle. To replace the carrying handle: 1. Place the handle in position on the upper housing. 2. While holding the handle in place, turn the upper housing right side down. Using a T20 Torx® driver, fasten the two screws previously removed. Do not overtighten. 5.7.7 Keypad Removal and Replacement Caution To prevent possible damage, do not fold or crease the flex circuit. To remove the keypad: 1. Slide a small flat-blade screwdriver or other flat tool under one edge of the keypad and gently lift to break the adhesive bond with the upper housing. 2. Lift the keypad away from the housing. Service Manual 5-17 Service and Repair 3. Clean the housing with alcohol to remove any adhesive residue. To replace the keypad: 1. Ensure the window does not have finger prints or dust prior to assembly. If necessary, remove protective film from window. 2. Peel away the protective paper backing from the new keypad to expose the adhesive. Use care during handling to ensure no fingerprints or contaminants are deposited on the adhesive surface of the keypad. 3. Route the flex circuit through the slot in the upper housing (Figure 5-9). Figure 5-9. Replacing the Keypad 4. Align the keypad within the recess in the upper housing and press into place. Use care when re-installing the upper housing so the flex circuit is not pinched. Caution Use care when installing the keypad, as any attempt to reposition it can damage the keys. 5-18 Service Manual Service and Repair 5.7.8 Exhalation Solenoid Valve Removal and Replacement The exhalation solenoid valve is mounted to the CPU PCBA and can be removed without removing the PCBA from the ventilator. To remove the exhalation solenoid valve: Refer to Figure 5-10 and do the following: 1. Disconnect the exhalation solenoid valve electrical cable from the CPU PCBA connector (J19). 2. Disconnect the two pneumatic tubes from the valve. 3. Remove the two screws fastening the solenoid valve to the CPU PCBA using a T9 Torx® driver. Figure 5-10. Pneumatic Tubing Connections (top view) 1 Pressure sensors 2 Exh. solenoid valve mounting screws 3 Exh. solenoid valve connector (J19) 4 Exh. solenoid valve 5 Open to atmosphere. Do not connect 6 Connects with tee to exh. valve pilot pressure port and valve pressure sensor Service Manual 7 From turbine 8 Connects with tee to exh. valve pilot pressure port and exh. solenoid valve (port 2) 9 Inspiratory gas from turbine 10 From inspiratory block proximal pressure port 11 From inspiratory block inspiratory port 5-19 Service and Repair To replace the exhalation solenoid valve: 1. Fasten the valve to the CPU PCBA with the two screws previously removed using a T9 Torx® driver. Do not overtighten. 2. Connect the pneumatic tubes to the valve ensuring correct placement as shown in Figure 5-10. The tube from the turbine connects to the valve ‘s port 1 (See Figure A-3) and the tube tee-connected to the inspiratory block exhalation valve pilot pressure port and pressure sensor marked “VALVE” on the CPU PCBA connects to the solenoid valve’s port 2 (See Figure A-3). Do not connect any tube to the barbed fitting closest to the upper edge of the PCBA). 3. Connect the valve’s electrical cable to CPU PCBA connector (J19). 5.7.9 CPU PCBA Removal and Replacement To remove the CPU PCBA: 1. Disconnect the following cables and pneumatic tubes from the CPU PCBA (Figure 5-11): • • • • • • • • 5-20 power management PCBA cable (J7) turbine control PCBA cable (J4) exhalation valve pressure sensor tube (1 VALVE) inspiratory pressure sensor tube (2 INTERNE) proximal pressure sensor tube (3 PROXIMALE) O2 valve cable (VALVE O2) remote alarm cable (J2) alarm cable (J18). Service Manual Service and Repair Figure 5-11. CPU PCBA Cables and Tubes (top view) 4 1 Power management PCBA cable 2 Turbine control PCBA cable 6 Proximal pressure tube 7 O2 solenoid valve cable 3 PCBA mounting screw 4 Exh. pilot pressure tube 8 Remote alarm cable 9 PCBA mounting screw 5 Inspiratory pressure tube 10 PCBA mounting screw 2. Remove the three CPU PCBA mounting screws using a T10 Torx® driver and turn the PCBA over to disconnect the following pneumatic tubes from the sensors on the PCBA: • inspiratory flow sensor (IN) and (OUT) tubes • exhalation solenoid valve (IN) and (OUT) tubes. Note: Observe tube routing to ensure tubes are not kinked or pinched upon reassembly. Service Manual 5-21 Service and Repair Figure 5-12. CPU PCBA Tubing Connections (underside view) 1 Inspiratory flow sensor (IN) 2 Exh. solenoid valve (IN) 3 Exh. solenoid valve (OUT) 4 Inspiratory flow sensor (OUT) To remove the turbine tube assembly: 1. Gently pull the tube (Figure 5-10) from the turbine and inspiratory block connectors. To replace the turbine tube assembly: 1. Push the tube onto the inspiratory block and turbine connectors, as shown in Figure 5-10. Ensure the tube is inserted fully on the connectors. To replace the CPU PCBA: 1. Reconnect the pneumatic tubing to the flow sensors and exhalation solenoid valve on the underside of the CPU PCBA according to the diagram shown in Figure 5-13. Refer to Section 7.4 for tubing lengths and diameters. 5-22 Service Manual Service and Repair Figure 5-13. Pneumatic Tubing Diagram 1 From outlet of insp flow sensor to insp block 2 From insp block to inlet of insp flow sensor 7 Exhalation solenoid valve 8 From coupling to port 1 of Exp. solenoid valve (see Figure A-3 in Appendix A) 9 From turbine to coupling 3 Inspiratory block 4 From inspiratory block to inspiratory pressure 10 O2 solenoid valve to turbine O2 inlet sensor 5 From proximal pressure port to proximal pressure 11 O2 inlet valve to O2 solenoid valve sensor Exhalation pilot pressure port tee connected with 6 exhalation valve pressure sensor and port 2 of Exp. solenoid valve (see Figure A-3 in Appendix A) Service Manual 5-23 Service and Repair 2. Place the CPU PCBA on the standoffs and install three mounting screws using a T10 Torx® driver. Ensure the tubing is routed underneath the PCBA so that it is not kinked or pinched. 3. Connect the tubing to the pressure sensor ports on top of the CPU PCBA according to the diagram shown in Figure 5-13. Note: Ensure the wider end of the straight connector is attached to the larger diameter tube and that the narrower end of the connector is attached to the smaller diameter tube. See Table 7-4 for part numbers. The tubes must be fully seated to the connector. 4. Make the following cable connections: • • • • • power management PCBA cable, (J7) turbine control PCBA cable, (J4) O2 valve cable (VALVE O2) remote alarm cable (J2) alarm cable (J18). 5.7.10 LCD Panel Removal and Replacement To remove the LCD panel: 1. Using a T10 Torx® driver, remove the four screws that fasten the LCD panel to the CPU PCBA (Figure 5-14). 5-24 Service Manual Service and Repair Figure 5-14. Removing the LCD Panel 1 LCD panel mounting screws (4 pl) 2. Gently lift the LCD panel away from the PCBA and lay it bottom side up on the work surface, being careful not to pull or damage the flex circuit. 3. Release the locking tabs on the LCD panel connector and slide the flex circuit away from the panel. Service Manual 5-25 Service and Repair Figure 5-15. LCD Flex Circuit Detail Flex circuit locking tabs (2 pl) - Pull connector tabs outward to unlock To replace the LCD panel: 1. Slide the flex circuit into the unlocked connector on the LCD panel and push the tabs inward to lock the circuit in place. 2. Turn the LCD panel over and mount to the standoffs on the CPU PCBA using four screws previously removed. 3. Peel back the protective cover from the LCD panel. 5.7.11 3V Battery Removal and Replacement The 3V battery is located on the CPU PCBA under the LCD panel (G1). To remove the 3V battery from the CPU PCBA: Avoid causing a short-circuit by using a small wood or plastic tool (the bare end of a cotton swab is shown in Figure 5-16) to push the battery out of its retainer on the CPU PCBA. 5-26 Service Manual Service and Repair Figure 5-16. Removing the 3V Battery (LCD panel removed) To replace the 3V battery on the CPU PCBA: Slide the new battery into the retainer (G1), making sure that the positive side of the battery is facing upward (Figure 5-17). Note: Verify time and date are correct after replacing battery. Service Manual 5-27 Service and Repair Figure 5-17. Replacing the 3V Battery Inspiratory block removal, cleaning and replacement 5.7.12 Inspiratory Block Removal and Replacement To remove the inspiratory block: 1. Detach the large tube connecting the inspiratory block (if not already removed) to the turbine assembly and remove the inspiratory block and connected pneumatic tubes from the ventilator lower housing. To clean the inspiratory block: 1. Remove the pneumatic tubes from the assembly and replace if dirty. Inspect the inspiratory block for signs of occlusion or damage. Replace if necessary. 2. Dampen a soft cloth with a cleaning solution (see Table 2-14 for a list of approved cleaners and disinfectants) and wipe the inspiratory block thoroughly. 3. Ensure the inspiratory block is completely dry and in good condition before reinstalling into the ventilator. To replace the inspiratory block: 1. Replace pneumatic tubes prior to installing the inspiratory block (Figure 5-13). See Section 7.4 for tubing part numbers and a detailed assembly drawing. 2. Push the large tube onto the turbine outlet fitting, making sure that the inspiratory block fitting rests on the support bracket. Note: Perform inspiratory flow sensor calibration after cleaning or replacing inspiratory block. 5-28 Service Manual Service and Repair Figure 5-18. Installing the Inspiratory Block 1 Turbine outlet fitting 2 Support bracket 3 Inspiratory block fitting Note: Not all tubes shown. 5.7.13 Buzzer PCBA Removal and Replacement To remove the buzzer PCBA: 1. If not already disconnected, remove buzzer PCBA connector from J18 on the CPU PCBA. 2. Slide the PCBA upward out of its slot in the lower housing. Service Manual 5-29 Service and Repair Figure 5-19. Buzzer PCBA and Cable Detail 1 Buzzer PCBA connector J18 2 Buzzer battery 3 Buzzer PCBA 5-30 Service Manual Service and Repair To replace the buzzer PCBA: Note: To ensure the buzzer PCBA switch is set properly, slide the switch to the left (Figure 5-20). Figure 5-20. How to properly set the Buzzer PCBA switch (underside of PCBA shown) Slide switch to the left 1. Insert the PCBA into its slot in the lower housing. Ensure the PCBA seats fully into the slot. 2. Re-connect the connector at J18 on the CPU PCBA. 5.7.14 Oxygen Solenoid Valve Removal and Replacement Refer to Figure 5-21 for oxygen solenoid valve removal and replacement. To remove the oxygen solenoid valve: 1. Cut the tie wrap and disconnect the silicone pneumatic tubing from the valve outlet fitting. Be careful not to cut the tubing. 2. Open the tabs on the cable guide 3 (Figure 5-21) to release the oxygen solenoid valve harness. 3. Remove the screws that hold the valve to its mounting bracket using a T9 Torx® driver. 4. Lift the valve assembly up, unscrew the knurled retainer ring, and pull the oxygen tubing from the barbed inlet fitting. A small flat-bladed screwdriver may be useful for loosening the tubing from the fitting. Note: If you need to replace the oxygen inlet tube and connector, you will have to remove the turbine assembly and power management PCBA first (see Section 5.7.15 and Section 5.7.18). Service Manual 5-31 Service and Repair Figure 5-21. Oxygen Valve Detail 1 O2 solenoid valve inlet 2 Knurled retaining ring 4 O2 solenoid valve harness 5 O2 solenoid valve outlet 6 Cable guide 3 3 O2 solenoid valve 7 O2 solenoid valve mounting screw 8 O2 solenoid valve mounting bracket To replace the oxygen solenoid valve: 1. Fasten the new oxygen solenoid valve to the mounting bracket using the two screws previously removed. 2. Connect the oxygen tubing to the valve inlet fitting, and tighten the knurled retainer ring. WARNING Ensure the oxygen tubing is connected tightly to the inlet fitting to prevent oxygen from leaking into the ventilator compartment. 3. Place the oxygen solenoid valve/bracket assembly into the lower housing and fasten in place with the two screws previously removed. Ensure the wiring harness is not caught underneath the mounting bracket. 4. Connect the silicone tube from the turbine assembly to the valve outlet fitting and fasten with a tie wrap using a tie wrap gun to ensure a tight grip on the tubing. 5. Route the valve’s wiring harness through cable guide 3 and bend the tabs closed. To test the connections for leaks: 1. Connect an O2 supply to the O2 inlet connector at the rear of the ventilator. Adjust the source pressure to less than 7 psi or 15 lpm. 5-32 Service Manual Service and Repair 2. Apply leak detector solution to each end of the tube where it connects with the oxygen inlet fitting at the rear of the ventilator and the oxygen solenoid valve inlet, and to the tube connecting the oxygen solenoid valve outlet to the turbine. Verify: • No bubbles form at the connections If a leak is detected, tighten connection and repeat test until no leaks are found. 3. Wipe any remaining leak detector solution from the connections. 5.7.15 Turbine Assembly Removal and Replacement Figure 5-22. Power Management/ Turbine Control Cable Detail 5 1 Toroid clamp 2 Toroid 4 Turbine control PCBA 5 Connector to CPU PCBA 3 Connector J1 To remove the turbine assembly: 1. Disconnect the power management/turbine control cable from the turbine control PCBA connector (J1) by pushing in the tab and pulling the connector. 2. Remove the cable clamp and remove the toroid and cable. 3. Cut the tie-wrap that secures the tube connected to the oxygen solenoid valve, and remove the tube from the turbine. Be careful not to cut the tube. 4. Disconnect the large tube from the turbine outlet and inspiratory block. 5. Disconnect the tube between the turbine and the exhalation solenoid valve. 6. Lift the turbine assembly out of the housing. Service Manual 5-33 Service and Repair To replace the turbine assembly: 1. Position the turbine assembly so that it rests on the foam pads in the lower housing. 2. Attach the tube connected to the oxygen solenoid valve to the turbine with a tiewrap as shown in Figure 5-21. Tighten the tie-wrap with a tie-wrap applicator gun. 3. Connect the tube between the exhalation solenoid valve and the turbine. 4. Connect the large silicone tube between the turbine outlet and inspiratory block. 5. Route the toroid/cable through the cable clamp and reinstall the assembly as shown in Figure 5-22. 6. Connect the cable to connector J1 on the Turbine Control PCBA. 5.7.16 Turbine Control PCBA Removal and Replacement To remove the Turbine Control PCBA: 1. Disconnect the motor and temperature sensor cables from the Turbine Control PCBA connector (J6) (Figure 5-23). 2. Unfasten the cable clamp and toroid/cable assembly. 3. Remove the four screws fastening the PCBA and mounting bracket to the turbine housing, using a T10 Torx® driver. 4. Lift the PCBA and bracket from the turbine assembly. 5. Disconnect the toroid/cable assembly from the PCBA by pushing in the tab on the connector at J1 and pulling the connector out of the PCBA. For ease of removal, disconnect the harness from the connector marked “Turbine” on the Power Management PCBA. 5-34 Service Manual Service and Repair Figure 5-23. Turbine Control PCBA 1 Mounting screw 2 Temp sensor cable 3 Do not pinch cables under bracket 4 Tie wrap (do not use tie wrap gun to tighten) 5 Motor cable (J6) 6 J1 connector To replace the Turbine Control PCBA: 1. Place the Turbine control PCBA on the turbine assembly standoffs aligning the holes in the PCBA with the standoffs. 2. Place the bracket over the PCBA, and route the cables under the bracket as shown in Figure 5-23. Make sure that the bracket captures the two cable assemblies, but does not pinch them against the turbine assembly body. 3. Apply a drop of Loctite 243 to each screw before inserting it into the standoff. Evenly tighten the screws using a T10 Torx® driver. Do not overtighten. 4. Connect the motor cable and temperature sensor cables as shown in Figure 5-23 to connector J6 on the PCBA. 5. Place a tie-wrap around the harnesses as shown in Figure 5-23 and hand-tighten. Do not tighten the tie-wrap with a tie-wrap gun. Cut the tail of tie-wrap with a cable cutter. 6. Connect the toroid/cable assembly to J1 on the turbine control PCBA and to the “Turbine” connector on the Power Management PCBA. Service Manual 5-35 Service and Repair 7. fasten the cable clamp to the corner of the turbine as shown in Figure 5-23. 5.7.17 Turbine Foam Pads Removal and Replacement To remove and replace lower turbine support pads: Lift the two turbine support pads out of the lower housing and replace with new ones in the locations shown (Figure 5-24). There is no adhesive on these pads. Figure 5-24. Turbine support pad detail To remove the upper turbine pads: 1. Using a flat tool or scraper, remove the pads from the top of the turbine. 2. Clean the residual adhesive from the turbine housing using isopropyl alcohol. Wipe dry. 5-36 Service Manual Service and Repair Figure 5-25. Upper Turbine Pad Detail 1 Front turbine pad adhered to metal part of turbine housing 2 Front of ventilator 3 Rear turbine pad adhered to metal part of turbine housing To replace the upper turbine pads: Peel the adhesive backing from the turbine pads and apply to the turbine housing in the positions shown in Figure 5-25. 5.7.18 Power Management PCBA Removal and Replacement The power management PCBA consists of the power management PCBA and the power supply PCBA. The power supply PCBA is mechanically fastened to the power management PCBA via four standoffs. To remove the power management PCBA: 1. Remove the battery to prevent damage from an accidental short-circuit. 2. Disconnect the fan from the power management PCBA connector (J6). Service Manual 5-37 Service and Repair Figure 5-26. Power Management PCBA Mounting Screw Locations 1 2 1 Mounting screw 4 Fan cable routed in fan recess 2 Mounting screw (beside power supply) 5 Mounting screw 3 Mounting screw 3. Remove the four screws fastening the power management PCBA to the lower housing using a T10 Torx® driver (Figure 5-26). 4. Lift the front of the Power Management PCBA to disconnect it from the Battery Connection PCBA, then remove from the ventilator housing taking care not to damage the connectors at the rear of the assembly. To replace the power management PCBA: 1. Place the power management PCBA onto the standoffs in the lower housing so that the connectors fit through the holes at the rear. Make sure that the connector on the power management PCBA is seated properly into Battery Connection PCBA connector (J1) (Figure 5-26). 2. Fasten the PCBA in place using the four screws previously removed. Do not overtighten. 3. Connect the fan cable to the PCBA connector (J6). 5-38 Service Manual Service and Repair 5.7.19 Fan Removal and Replacement To remove the fan: 1. Remove the two screws fastening the fan to the lower housing using a T10 Torx® driver (Figure 5-27). Figure 5-27. Fan Detail Wires routed through retainer in fan housing To replace the fan: 1. Ensure the fan is oriented as shown in Figure 5-27 with air flow pointing UP and route the wiring harness through the retainer on the fan housing. 2. Fasten the fan to the lower housing using two screws placed diagonally as shown in Figure 5-27. Do not overtighten. 5.7.20 Battery Connection PCBA Removal and Replacement To remove the battery connection PCBA: 1. Remove the screw fastening the battery connection PCBA stop to the housing using a T10 Torx® driver. 2. Lift the battery connection PCBA (Figure 5-28) out of its slot. Service Manual 5-39 Service and Repair Figure 5-28. Battery Connection PCBA To replace the battery connection PCBA: 1. Insert the battery connection PCBA into the slot in the lower housing. 2. Install the bracket with the screw previously removed so that it retains the PCBA. Do not overtighten. 5.7.21 Remote Alarm (Nurse Call) Cable Removal and Replacement To remove the remote alarm cable: 1. Bend back the tabs on cable guide 1 to release the cable from the lower housing. 2. Remove the connector lock nut from the inside of the lower housing using an 11 mm open-end wrench or needle-nose pliers. 3. Remove the cable from the back of the lower housing. 5-40 Service Manual Service and Repair Figure 5-29. Remote Alarm Cable and Oxygen Tubing Detail 1 Remote alarm harness 2 Oxygen connector 4 Cable guide 2 5 Cable guide 3 3 Cable guide 1 6 Ferrite To replace the remote alarm harness: 1. Remove nut and washer prior to pushing connector through slot in rear of enclosure. (Figure 5-30) 2. Form cable and connector as shown and push through nut. Be careful not to damage wire during this operation. Figure 5-30. Remote Alarm Harness 1 Location for harness Service Manual 5-41 Service and Repair 3. Thread washer and nut over connector as shown in (Figure 5-32) and line up the tab with the notch on the housing. (Figure 5-31) 4. Ensure connector socket is oriented so that pin 1 is at the top (Figure 5-32) 5. Hand tighten when connector is correctly aligned. (Figure 5-32) 6. Tighten locking nut (Figure 5-32) using 12mm wrench. Once complete ensure the socket is oriented so that pin 1 is at the top. Do not over tighten. Figure 5-31. Aligning the Tab on the Harness Connector With the Notch on the Housing 1 Notch on housing 2 Tab on harness connector 5-42 Service Manual Service and Repair Figure 5-32. Orientation of the Connector and Tightening Locking Nut 1 Connector 2 Locking nut 7. Route the cable through cable guide 1 (Figure 5-29) and secure it by bending the tabs over the cable. 8. Open the ferrite. 9. Twist remote alarm cable so that it sits inside the ferrite and clamp the ferrite closed (Figure 5-33). 10. Secure ferrite to lower housing with a 25 mm length of double-sided tape (See Table 7-3 for part numbers). 11. Refer to Table 7-6 for replacement label kit. Service Manual 5-43 Service and Repair Figure 5-33. Remote Alarm Harness Installed Into Ferrite 1 Ferrite 2 Cable guide 3 5.7.22 Oxygen Connector/Tube Assembly Removal and Replacement To remove the oxygen connector/ tube assembly: 1. Bend back the tabs on cable guide 2 (Figure 5-29) to release the tubing from the lower housing. 2. Remove the connector lock nut from the inside of the lower housing using a 16-mm open-end wrench or a needle-nose plier (Figure 5-29). 3. Remove the assembly from the back of the lower housing. 5-44 Service Manual Service and Repair To replace the oxygen connector/ tube assembly: 1. Insert the tube assembly through the opening in the back of the lower housing. Ensure the connector is oriented as shown in Figure 5-34. Figure 5-34. Oxygen Connector Properly Oriented Install the lock nut on th 2. Route the tube through cable guide 2 (Figure 5-29) and secure it by bending the tabs over the tube being careful not to pinch the tube. 3. Connect the tubing from the oxygen solenoid valve to the turbine assembly, and secure it with a tie-wrap using a tie-wrap gun. 5.7.23 Lower Housing Replacement When replacing the lower housing, you must also transfer the old serial number to the new housing. Use care when removing the serial number. If the serial number is damaged during removal, call your local tech support representative for serial number replacement. If the serial number label (with window) is damaged during removal, order a new label kit (part number is provided in Table 7-7). To replace the lower housing: 1. Follow the removal steps listed above to remove all components from the lower housing. 2. Reverse the disassembly steps to reassemble ventilator. Service Manual 5-45 Service and Repair 5.8 Post-ventilator Repair Information If you have made any repairs that have required opening the ventilator housing, you must run the Performance Verification procedures described in Chapter 6. Table 5-2 describes what testing and calibration is required following ventilator service. Table 5-2. Testing and Calibration Requirements 5-46 Type of service Required test or calibration Ventilator installation (if requested) 1. POST 2. Electrical safety 3. Calibrations Software download 1. 2. 3. 4. Software download POST Electrical safety Performance verification testing, including calibrations Biennial checkout (every two years) 1. 2. 3. 4. POST Visual inspection Electrical safety Performance verification testing, including calibrations Preventive maintenance 1. 2. 3. 4. POST Visual inspection Electrical safety Performance verification testing, including calibrations Battery replacement 1. POST 2. Visual inspection 3. Electrical safety Keypad replacement 1. 2. 3. 4. LCD replacement 1. 2. 3. 4. POST Visual inspection Electrical safety Performance verification testing, including calibrations 5. Performance verification testing, including calibrations POST Electrical safety Calibrations Performance verification testing, including calibrations 5. Performance verification testing, including calibrations Service Manual Service and Repair Table 5-2. Testing and Calibration Requirements (continued) Type of service Required test or calibration CPU or power management PCBA replacement 1. 2. 3. 4. 5. POST Visual inspection Software download Electrical safety Performance verification testing, including calibrations Replacement of: 1. 2. 3. 4. POST Visual inspection Electrical safety Performance verification testing, including calibrations • • • • • • • • • • • • • Service Manual battery connection PCBA buzzer PCBA exhalation solenoid valve fan harnesses housing inspiratory block oxygen connector oxygen solenoid pneumatic tubing turbine turbine controller PCBA any internal cable. 5-47 Service and Repair This page intentionally blank 5-48 Service Manual 6 Performance Verification This chapter describes how to verify the performance of the Puritan Bennett™ 520 Ventilator after it has been repaired or has undergone preventive maintenance. It includes calibration and final functional tests, electrical safety tests plus specific performance verification tests, using the Puritan Bennett PTS 2000 Performance Test System with Puritan Bennett 500 Series Ventilator Test Software. Manual ventilator checks are also included in this chapter. Refer to Table 2-14 for required tools and service materials. Performance verification is designed to verify ventilator output (volume accuracy ± (10 mL + 10%) of setting; pressure accuracy ± (2 cmH2O + 8%) of setting, using the PTS 2000 in combination with the BreathLab RPTS software application. Note: To ensure the ventilator performs within specifications, Covidien recommends you use the Puritan Bennett PTS 2000 Performance Test System in conjunction with the Puritan Bennett™ 500 Series Ventilator Test Software. If you do not have this software, record test results manually. WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. 6.1 Test Prerequisites Note: • This manual is written assuming English (US) language is selected in ventilator SETUP (Section 2.12). Ventilator messages will be different depending upon the language selected. • Test the device under ambient conditions. If the device has been in use recently, allow it to reach ambient temperature before testing. • • Set Apnea Alarm to OFF in Preferences menu. Turn all alarms OFF or set them to their minimum or maximum values. If any performance verification test or calibration fails, use the following steps to troubleshoot the failure: 1. Verify PTS 2000 and ventilator settings and setups are correct. 2. Repeat the test or calibration steps. 3. Replace associated component(s). 6-1 Performance Verification 4. Review the technical fault log for the specific failure (see Section 4.4.1 to troubleshoot). 5. Check for specific alarm messages and (refer to Chapter 4 “Alarms and Troubleshooting” to troubleshoot calibration failures). 6.2 When to Run Performance Verification Run performance verification tests following ventilator service as summarized in Table 6-1. Table 6-1. Testing and Calibration Requirements Type of service Required test or calibration Software download 1. POST 2. Visual inspection Biennial checkout (every two years) or 15000-hour preventive maintenance 1. 2. 3. 4. 5. POST Visual inspection Electrical safety test All calibrations All performance verification tests Replacement of: 1. 2. 3. 4. 5. 6. 7. 8. POST Visual inspection Electrical safety test Measurements check All calibrations All alarms tests Remote alarm test Power off while ventilating test • • 3 V battery any internal harness Replacement of: • • keypad upper housing assembly Replacement of: • 6-2 internal Li-ion battery 1. POST 2. Visual inspection 3. Electrical safety test 1. 2. 3. 4. POST Visual inspection Measurements check Power management software download if not version AL020002 or later Service Manual Performance Verification Table 6-1. Testing and Calibration Requirements (continued) Type of service Required test or calibration Replacement of: 1. 2. 3. 4. 5. 6. POST Visual inspection Software download as applicable Electrical safety test All calibrations All performance verification tests 1. 2. 3. 4. 5. 6. POST Visual inspection Electrical safety test Measurements check All alarms tests except remote alarm test Power off while ventilating test 1. 2. 3. 4. 5. POST Visual inspection Electrical safety test All calibrations All performance verification tests • • CPU PCBA power management PCBA Replacement of: • • • buzzer PCBA battery connection PCBA fan Replacement of: • • • • • • • • • Service Manual exhalation valve solenoid lower housing assembly inspiratory conical fitting oxygen (O2) female connector oxygen (O2) solenoid valve any internal pneumatic tubing turbine/blower turbine controller PCBA exhalation conical fitting support 6-3 Performance Verification 6.3 Required Materials and Equipment • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 6-4 PC operating on Windows XP or Windows 7 Serial cable, RS232, DB9 male to DB9 female, 4-074688-00 USB 2.0 serial converter, local supplier PTS 2000 pneumatic analyzer, 4-076185-00 BreathLab PTS RPTS application software, 4-075356-00 Patient circuit, pediatric single-limb, with exhalation valve, 5093500 Patient circuit, adult single-limb, with exhalation valve, 5093600 Test Lung, 1.0-liter, Deluxe Adult, White w/Restrictor, P/N LNG800P or equivalent Test Lung, 4-liter, 4-075578-00 Gold standard tube, 22-mm ID X 21.0-inch flex tube, 4-018506-00 Connector, tubing junction, 22-mm OD barbed with pressure port, 4-011521-00 Tee connector, 1/8-inch ID tubing, local supplier Silicone tubing, 1/8-inch ID, various lengths, 4-008578-00 or equivalent Silicone tubing, 7/32-inch ID, various lengths, local supplier Silicone tubing, 3/16-inch ID, various lengths, 4-008577-00 or equivalent Connector, tubing, 3/16-inch ID to 1/8-inch ID, 4-006104-00 or equivalent Silicone barbed coupling, 22-mm ID, 4-003443-00, (3 required) Calibration shell, S-231702-00 Adapter, 15-mm ID/22-mm OD x barb, 4-002902-00 or equivalent Stopper, no. 2, G-061574-00 or equivalent Stopper, no. 1, 4-009523-00 or equivalent ReFlex filter, barbed, 4-074644-00 DC power supply, adjustable, minimum 2 A output, Extech model 382202 or equivalent Digital multimeter, Fluke 87 or equivalent Test cable, DC power, 10000021 Electrical Safety Analyzer, Fluke ESA620 or equivalent Fluke ESA620 accessory kit (test leads, etc.) Test cable, ground, 10000017 Remote alarm test box, RA I (black plastic connector), 10000019 Remote alarm test box, RA II (gray metallic connector), 10005329 Oxygen connector, male, 2962700 Oxygen supply, regulated to <7 psi at < 15 lpm, local supplier Service Manual Performance Verification • USB memory device, 128 MB to 4 GB, formatted in 32-bit file format, local supplier • Static-dissipative Field Service Kit, 4-018149-00 6.3.1 PTS 2000 Setup 1. Set the PTS 2000 up as shown (Figure 6-1) and described below. Figure 6-1. PTS 2000 Setup 2. Attach a silicone barbed coupling to the high flow inlet port of the PTS 2000. 3. Attach the 22-mm tubing connector with pressure port to the barbed coupling. 4. Attach another barbed coupling to the 22-mm tubing connector. 5. Attach the barbed Re/Flex filter to the barbed coupling, making sure that flow direction arrow on the filter housing points towards the PTS 2000. 6. Connect one end of a short piece of 3/16-inch ID tubing to the pressure port on the 22-mm tubing junction. 7. Connect the 3/16-inch x 1/8-inch tubing connector to other end of the 3/16 ID tubing. Service Manual 6-5 Performance Verification 8. Connect the 3/16-inch x 1/8-inch tubing connector to on end of short piece of 1/8inch ID tubing. 9. Connect the other end of 1/8-inch ID tubing to (+) low pressure port on the front of the PTS 2000. 10. Connect the USB 2.0 serial converter to a USB port on the PC. 11. Connect the serial cable to the USB 2.0 serial converter. 12. Connect the other end of the USB serial converter to a serial port on the rear of the PTS 2000. 13. The USB port must be set to COM1 on the PC for the USB serial converter to communicate with the PTS 2000. 14. Power on the PTS 2000 and allow a ten (10) minute warm-up. 15. Perform oxygen sensor calibration per the PTS 2000 User's Manual. 16. Set the PTS 2000 to REMOTE OPERATION mode before launching BreathLab PTS RPTS application software. 6.4 Electrical Safety Test This test verifies that the Puritan Bennett 520 Ventilator meets the leakage current requirements of IEC 60601-1:1990 or 1988 for Class II, Type BF devices. You may use any electrical safety analyzer capable of performing the required tests for this device classification. Refer to Table 6-2 for appropriate test limits. Refer to the analyzer operating instructions for details on test setup and test steps. Warning • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. Follow these steps: 1. Test the ventilator according to the electrical safety analyzer’s instructions. 2. Verify the test results are within the limits listed in Table 6-2. Table 6-2. Electrical Safety Test Limits Test 6-6 Line configuration Test limit Enclosure Leakage Current (AC + DC) Normal Condition (NC) 100 A Enclosure Leakage Current (AC + DC) Normal Condition/Reversed Mains (NCRM) 100 A Enclosure Leakage Current (AC + DC) Open Supply (OS) 500 A Enclosure Leakage Current (AC + DC) Open Supply/Reversed Mains (OSRM) 500 A Service Manual Performance Verification Table 6-2. Electrical Safety Test Limits (continued) Test Service Manual Line configuration Test limit Mains on Applied Part Leakage Current Single Fault Condition (SFC) 5000 A Mains on Applied Part Leakage Current Single Fault Condition, Reversed Mains (SFCRM) 5000 A Patient Leakage Current, AC Open Supply (OS) 500 A Patient Leakage Current, AC Normal Condition (NC) 100 A Patient Leakage Current, AC Open Supply/Reversed Mains (OSRM) 500 A Patient Leakage Current, AC Normal Condition/Reversed Mains (NCRM) 100 A Patient Leakage Current, DC Open Supply (OS) 500 A Patient Leakage Current, DC Normal Condition (NC) 100 A Patient Leakage Current, DC Open Supply/Reversed Mains (OSRM) 500 A Patient Leakage Current, DC Normal Condition/Reversed Mains (NCRM) 100 A 6-7 Performance Verification 6.5 Power-on Indicators Check WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. 1. Connect the ventilator to an AC power source. 2. Switch the ventilator power switch (I/O) to the ON (I) position. 3. Verify that the red, yellow, and blue LEDs flash briefly and two alarm tones sound. 4. Verify that the blue LED turns on and remains illuminated. 5. Verify that the AC power indicator LED is on and remains illuminated. 6.6 Ventilator Configuration The Performance Verification process requires that you access the Setup screen to configure the ventilator, if it is not already done. Configuration includes setting the language, date, time, resetting patient hours to zero, and turning on altitude compensation from the Maintenance Mode > Measurement Check menu. Setting the current time and date provides a frame of reference for any technical faults or errors that may occur during calibration or verification steps. WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. 6.6.1 Accessing the Setup Screen Follow these steps to access the setup screen as required: 1. Ensure the ventilator’s power switch is in the OFF (O) position. 2. Press and hold the ALARM CONTROL key while simultaneously switching the ventilator’s power switch to the ON (I) position. Continue holding the ALARM CONTROL key until the Setup screen appears (Figure 6-2). 6-8 Service Manual Performance Verification Figure 6-2. Setup Screen on Puritan Bennett 520 Ventilator Information displayed on this screen is for illustrative purposes only 6.6.2 Change Language, Date, Time, or Other Settings 1. Use the UP or DOWN arrow keys to place move the cursor when necessary. 2. Place the cursor on Language. 3. Press ENTER and use the up or down arrow keys to select ENGLISH (US) and press ENTER. 4. Place the cursor on Date and press ENTER. 5. Using the UP or DOWN arrow keys, set the current date and press the ENTER. 6. Place cursor on Time and press ENTER. 7. Using the UP or DOWN arrow keys, set the current time and press ENTER. 6.6.3 Entering Maintenance Mode Follow these steps to enter Maintenance mode as required: 1. Position the cursor at the Maintenance position (Figure 6-2) and press ENTER. The Maintenance screen appears (Figure 6-3). Service Manual 6-9 Performance Verification Figure 6-3. Maintenance Screen Information shown is for illustrative purposes only 6.7 Technical Fault Check WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. Follow these steps to view any technical faults: 1. Enter Maintenance mode (Section 6.6.3). 2. Select Faults Check and press ENTER. 3. Review the FAULTS log and refer to Table 4-2 to determine any corrective action necessary for any fault codes displayed. 4. Address any technical faults before completing the performance verification. 6-10 Service Manual Performance Verification 6.8 Measurements Check WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. Follow these steps to perform the measurements check: Note: Before running the Measurements check, warm up the ventilator for at least ten (10) minutes by running the turbine at full speed with calibration shell attached to inspiratory port. To run turbine at full speed, enter the Maintenance menu, place the cursor on Turbine Speed and press the Menu key.This is particularly important so that the blower will be at the correct temperature during the Measurements check. 1. Disconnect any external DC power source, and connect the ventilator to AC power. 2. Power on ventilator in normal mode and set default parameters per Table 2-5, Table 2-6, and Table 2-7. Ensure that Key Sound is set to Accept tone in preferences menu. 3. Power on ventilator in Maintenance mode and access the SETUP menu as previously instructed (Section 6.6.3). 4. Use the arrow keys to select Maintenance and press ENTER. 5. Select Measurement Check and press ENTER. The Measurements Check screen appears (Figure 6-4). Service Manual 6-11 Performance Verification 6. After the Measurements Check screen appears, verify that the displayed values are within the specifications listed in Table 6-3. Figure 6-4. Measurements Check Screen. Table 6-3. Measurements Check Specifications 6-12 Parameter Specification 24 V check 23.5 - 24.5 V 1. Ensure Power Management cable is connected properly and is not damaged. 2. Verify 24 V on connector J7 (see Section 4.4.4.2). 3. Replace Power Management PCBA (see Section 5.7.18). 4. Replace CPU PCBA (see Section 5.7.9). Troubleshooting steps Watchdog 23.5 - 24.5 V 1. Replace CPU PCBA (see Section 5.7.9). Barometric pressure Ventilator reading is + 11 mmHg of the PTS 2000 barometric measurement. 1. Ensure no tubing is connected to the barometric pressure transducer. 2. Replace CPU PCBA (see Section 5.7.9). Service Manual Performance Verification Table 6-3. Measurements Check Specifications (continued) Parameter Specification o o Troubleshooting steps o o Internal temperature 30 C - 55 C (86 F - 131 F) 1. Relocate ventilator to a cooler environment. 2. Ensure the side and front cooling vents are not obstructed. 3. Ensure the fan is running. 4. Replace Power Management PCBA (see Section 5.7.18). Blower temperature 35oC - 65oC (95oF - 149oF) 1. Warm up the ventilator for at least ten minutes in maintenance mode with the calibration shell attached to the inspiratory port and turbine speed set to maximum. Ensure the turbine control cable is connected properly and is not damaged. 2. Replace the turbine (see Section 5.7.16). Long beep sounds and 1. Verify that default parameters are set per Table 2-5,Table 2-6 and Table 2-7. It is particularly important that Key Sound is set to Accept tone in Preferences menu for correct Buzzer voltage result. 2. Charge the buzzer battery by allowing the ventilator to remain powered on and connected to AC power for at least 30 minutes and up to 2 hours. 3. Verify that the PCBAmounted switch on the buzzer PCBA is set to OFF. 4. Replace the Buzzer PCBA. 5. Replace the CPU PCBA. Buzzer Buzzer voltage = 1.7 - 2.1 V Backup buzzer Service Manual Long beep sounds Replace CPU PCBA (see Section 5.7.9). 6-13 Performance Verification Table 6-3. Measurements Check Specifications (continued) Parameter Specification Altitude Compensation YES Supplier Approved supplier Troubleshooting steps Set to YES in Measurements Check menu. Internal battery menu If supplier is not displayed: 1. Verify that Power Management software is most current version. 2. Replace the Li-ion battery (Section 5.7.4). 6-14 First use date Record value N/A Theoretical capacity 2400 mAh Replace battery (see Section 5.7.4). Capacity (actual) 1920 mAh minimum Replace Li-ion battery (see Section 5.7.4). Cycles done N/A N/A Battery voltage 23.5 V - 29.7 V 1. Connect ventilator to an AC power source to charge battery. 2. Replace Li-ion battery (see Section 5.7.4). 3. Inspect electrical contacts on Battery Connection PCBA and battery for damage or oxidation. 4. Verify proper connection of Battery Connection PCBA and Power Management PCBA. 5. Replace Battery Connection PCBA (see Section 5.7.20). 6. Replace Power Management PCBA (see Section 5.7.18). Battery temperature 0oC - 40oC (32oF - 104oF) 1. Verify that the air flow vents in the battery cover are not obstructed. 2. Check for proper operation of the fan. 3. Replace the Li-ion battery (see Section 5.7.4). Service Manual Performance Verification 7. Select Buzzer and press ENTER. Verify a long beep sounds and the voltage displayed is 1.7 V to 2.1 V. Note: For Buzzer voltage above 2.1 V, allow buzzer battery to charge by leaving ventilator powered on in maintenance mode for 30 minutes and up to two hours. For Buzzer voltage below 1.7 V, verify that Key Sound is set to Accept tone in the Preferences menu. 8. Select Back-up Buzzer and press ENTER. 9. Verify a long beep sounds. 10. Select the Internal Battery menu and press ENTER. 11. Ensure the displayed values are within the specifications summarized in Table 6-3. 12. Select Altitude Comp and press ENTER. Use the arrow keys to change the value to YES if it is not already set to YES and press ENTER. WARNING The default setting for altitude compensation is YES. Altitude compensation should always be set to YES for accurate volume delivery calculations at all elevations. 13. Select Back and press ENTER to return to the Maintenance screen. 6.9 Calibration This series of steps calibrates the pressure sensors and flow sensor. WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. 6.9.1 Patient Pressure Sensor Calibration 1. Setup: a. Connect the ventilator and the PTS 2000 as follows (Figure 6-5): b. Block the exhalation valve pilot port using a section of 1/8 inch tubing blocked at one end. c. Use a 22-mm ID barbed coupling to connect the calibration shell assembly to the ventilator’s inspiratory port. d. Connect the low pressure tube from the calibration shell assembly to the positive (+) low pressure port on the PTS 2000. e. Set the PTS 2000 to measure Low Pressure, cmH20. f. Verify that the PTS 2000 Low Pressure reads 0.0 ± 0.1 cmH2O. Service Manual 6-15 Performance Verification Note: If the PTS 2000 low pressure measurement not 0.0 ± 0.1 cmH2O, zero the PTS 2000 low pressure transducer per the PTS 2000 User's Manual before proceeding. Figure 6-5. Pressure Sensor Calibration Test Setup PTS 2000 silicone coupling 1/8” ID tubing tee connector 7/32” ID tubing calibration shell 2. Patient pressure sensor calibration: a. Access the ventilator MAINTENANCE menu as previously instructed.(Section 6.6.3). b. Select Sensors Calibration and press ENTER. c. Select Patient Pressure and press ENTER. d. Press and hold ENTER to accept the zero (0) reading. e. Adjust the turbine speed using the UP or DOWN arrow keys to read 39.80 cmH2O to 40.20 cmH2O (40.00 cmH2O ± 0.20) on PTS2000 Low Pressure measurement. f. Press and hold ENTER until a short beep sounds. A long beep indicates that the calibration failed. g. Press the Menu key twice to verify 39.60 cmH2O to 40.40 cmH2O is measured on PTS 2000 for Low Pressure. h. Press the Menu key to complete the calibration check. 6-16 Service Manual Performance Verification 6.9.2 Exhalation Valve (Internal Valve) Pressure Sensor Calibration 1. Use the DOWN arrow key to place the cursor at Int Valve pressure. 2. Press ENTER. • The calibration runs automatically without requiring that the user hold down the ENTER. • Successful calibration is indicated by a short beep while a calibration failure is indicated by a long beep. 6.9.3 Inspiration Flow Calibration 1. Connect a gold standard tube to the ventilator’s inspiratory port and to the PTS 2000 high flow inlet filter (Figure 6-6). Figure 6-6. Inspiration Flow Calibration Test Setup 2. Set the PTS 2000 to measure HIGH FLOW, slpm, Air. 3. Ensure the protective cover for the PTS 2000 high flow outlet port is removed. 4. Use the UP or DOWN arrow keys to place the cursor at the Inspiration Flow position. 5. Press ENTER. 6. Verify that the display flashes 0 and that PTS 2000 reads 0.00 ± 0.10 slpm. Service Manual 6-17 Performance Verification 7. Press and hold ENTER to accept the calibration and proceed to next calibration point. • For each flow listed below, use the UP or DOWN arrow keys to adjust the turbine speed to obtain the specified flow measurement after each reading stabilizes. • Press and hold ENTER until a short beep sounds. 0 slpm ± 0.10 slpm 4.90 slpm to 5.10 slpm 11.76 slpm to 12.24 slpm 19.6 slpm to 20.4 slpm 36.26 slpm to 37.74 slpm 58.8 slpm to 61.2 slpm 88.2 slpm to 91.8 slpm 1127.4 slpm to 132.6 slpm To verify the inspiration flow calibration: a. Place the cursor is at the Inspiration Flow position and press the Menu key. b. Verify that the PTS 2000 readings are within the following ranges: 0 ± 0.10 slpm 4.50 slpm to 5.50 slpm 11.1 slpm to 12.9 slpm 19.0 slpm to 21.0 slpm 35.1 slpm to 38.9 slpm 57.0 slpm to 63.0 slpm 85.5 slpm to 94.5 slpm 123.5 slpm to 136.5 slpm c. Press the Menu key to complete the check. 8. To resolve calibration verification failures: a. Check the ventilator and the PTS 2000 setup. b. Verify that the PTS 2000 and the ventilator have warmed up for ten (10) minutes. c. Recalibrate inspiration flow. d. Check for kinked or disconnected internal pneumatic tubing. 6-18 Service Manual Performance Verification 6.10 Flow Sensor Capacity Test WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. This test checks the maximum flow capability of the turbine when there is no pressure in the circuit. An external measurement device (PTS 2000) is not used during this test. 1. Remove all tubing from the ventilator. 2. If not already in the Maintenance menu, access Maintenance menu as previously instructed (Section 6.6.3). 3. Use the UP or DOWN arrow keys to place the cursor at the Turbine Speed position. 4. Press the Menu key. 5. Verify that the inspiration flow reading is > 145 slpm (shown on ventilator display). 6. Use the UP or DOWN arrow keys to stop the turbine. 6.10.1 Turbine Performance Test This test verifies that the turbine can generate a minimum pressure during a noflow condition. 1. With the ventilator and the PTS 2000 in the same setup as the previous test, connect the calibration shell to the To Patient port on the ventilator using the 22-mm ID barbed silicone coupling (Figure 6-7). Service Manual 6-19 Performance Verification Figure 6-7. Test Setup for Turbine Performance Test block hole in calibration shell Block hole with your thumb during test 2. Set the PTS 2000 to measure LOW PRESSURE, cmH2O. 3. Verify that low pressure reads 0.0 ± 0.1 on the PTS 2000. • If the PTS 2000 low pressure measurement not 0.0 ± 0.1 cmH2O, zero the PTS 2000 low pressure transducer per the PTS 2000 User's Manual before proceeding. 4. Use the UP or DOWN arrow keys to position the cursor at the Turbine Speed position. 5. Press the MENU key to command the turbine to full speed. 6. Block the hole in the calibration shell with your finger (Figure 6-7). Caution Do not block hole for more than 3 seconds or turbine damage could result. 7. Verify that the PTS 2000 indicates a pressure reading > 70 cmH2O. 8. Verify that the ventilator displays a patient pressure reading > 70 cmH2O. 9. With the hole in the calibration shell unblocked, remove the tubing from the patient pressure port. 10. Verify that the patient pressure reading (in the right-hand column of the ventilator display) is 0 ± 0.5 cmH2O (Figure 6-8). If the right-hand column reads > 70 cmH2O and the left-hand column reads 0 ± 0.5 cmH2O, the internal tubes may be reversed. 6-20 Service Manual Performance Verification 11. Press the UP or DOWN arrow key to stop the turbine. Figure 6-8. Expected Turbine Performance Test Patient Pressure Reading 1 Value should read 0 ± 0.5 cmH2O 6.10.2 Oxygen Solenoid Functional Test WARNING Ensure the oxygen supply pressure to the machine never exceeds 7 psi (50 kPa) or a flow of 15 lpm. Figure 6-9. Oxygen Solenoid Test Setup Front view 1 Rear view Connect 22-mm tube from PTS 2000 high flow inlet to ventilator To Patient port 1. Set the PTS 2000 to display Oxygen % measurement. 2. Connect an oxygen supply to the O2 inlet connector at the rear of the ventilator (Figure 6-9). Service Manual 6-21 Performance Verification 3. Adjust the source pressure to < 7 psi (at no more than 15 lpm). 4. Ensure the oxygen supply is turned off. 5. Connect a gold standard tube from the ventilator’s To Patient port to the high flow inlet on the PTS 2000 (Figure 6-9). 6. Block the exhalation valve pilot pressure port or attach the exhalation valve pilot pressure line to the pilot pressure port. 7. With the ventilator in normal ventilation mode on standby, set ventilation parameters to default settings: P A/C Pi: 15 cmH2O PEEP: OFF Rise time: 2 R-Rate: 10 Insp time: 1.3 (I:E = 1:3.6 or I/T = 22%) Insp sens: 2 V/t target: OFF VTI mL Min: OFF VTI mL Max: OFF Rtot bpm High: OFF 8. Start ventilation by pressing the Ventilation On/Off key. 9. After approximately 30 seconds, verify the PTS 2000 O2 % measures 21.0 % ± 3.0 %. 10. Stop ventilation. 11. Turn on oxygen supply (< 7 psi, < 15 lpm). 12. After approximately 30 seconds, verify that the PTS 2000 oxygen % measures > 25.0%. 13. Turn off oxygen supply and disconnect the O2 supply hose and connector from the ventilator while continuing ventilation. 14. Allow the PTS 2000 oxygen % reading to return to approximately 21% to ensure the system is purged of oxygen. 15. Stop ventilation by placing the ventilator into standby mode. 16. Disconnect the gold standard tube from the ventilator. 6-22 Service Manual Performance Verification 6.11 Breath Delivery Accuracy Tests WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. Breath delivery accuracy testing verifies the ventilator’s output pressure accuracy ± (2 cmH2O + 8%) of setting, using the PTS 2000 in combination with BreathLab RPTS software application. 6.11.1 Test Prerequisites • The PTS 2000 and the ventilator must have been powered on for a minimum of ten (10) minutes for proper warm-up. • Turn off all settable alarms. • Access the SETUP menu, set the Pressure Unit to cmH2O and Relative pressure to YES. • Due to the test setup, the ventilator does not display a VTE reading during volume tests. Service Manual 6-23 Performance Verification 6.11.2 Pediatric Pressure Accuracy 1. Connect a 4-liter test lung to the end of gold standard tube (Figure 6-10). Figure 6-10. Pediatric Pressure Test Setup 2. Set the PTS 2000 to measure Low Pressure, cmH2O. 3. With the ventilator in normal ventilation mode on standby, set the following parameters: • • • • • • • • • • • P A/C Pi: 10 cmH2O PEEP: OFF Rise time: 1 R-Rate: 10 bpm Insp Time: 1.3 s (I:E = 1:3.6 or I/T = 22%) Insp Sens: 5 Vt Target: OFF VTI mL Min: OFF VTI mL Max: OFF R tot bpm High: OFF Note: Turn off all settable alarms. 4. Start ventilation by pressing the Ventilation On/Off key. 6-24 Service Manual Performance Verification 5. After the ventilator delivers approximately 15 breaths, verify that the PIP reading displayed in the ventilator's Alarm menu screen is 8 to 12 cmH2O. 6. Verify that the delivered peak low pressure measured by the PTS 2000 is within calculated test limits (Pi +/- (8.75% + 2.04 cmH2O)). 7. Stop ventilation by using the Ventilation On/Off key. 6.11.3 Adult Pressure Accuracy 1. Connect the 15-mm ID port of the 22-mm OD/15-mm ID adapter to the open end of the gold standard tube (Figure 6-11). Figure 6-11. Adult Pressure Accuracy Test Setup 2. Connect the 1.0-liter hard sided test lung to the 15-mm ID port of the 22-mm/15-mm adapter (Figure 6-11). 3. Set the PTS 2000 to measure Low Pressure, cmH2O. 4. With the ventilator in normal ventilation mode on standby, set the following parameters: • • • • • • • • • • • Service Manual P A/C Pi: 20 cmH2O PEEP: OFF Rise time: 1 R-Rate: 10 bpm Insp time: 1.3 s (I:E = 1:3.6 or I/T = 22%) Insp Sens: 5 Vt target: OFF VTI mL Min: OFF VTI mL Max: OFF R tot bpm High: OFF 6-25 Performance Verification 5. Start ventilation using the Ventilation On/Off key. 6. After the ventilator delivers approximately 15 breaths, verify that the PIP reading displayed in the ventilator's Alarms menu screen is 17 to 23 cmH2O. 7. Verify that the delivered peak low pressure measured by the PTS 2000 is within calculated test limits (Pi +/- (8.75% + 2.04 cmH2O)). 8. Stop ventilation by using the Ventilation On/Off key. 6.12 AC/DC/Battery Power Switching Test WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. 1. Disconnect AC power from the ventilator. 2. If not already connected, connect the DC test cable to the DC power supply’s positive and negative outputs and External Battery connector on the ventilator’s rear panel (Figure 6-12). Figure 6-12. Power Switching Test Setup (rear view) 6-26 Service Manual Performance Verification Figure 6-13. Power Switching Test Setup (front view) 3. Set the external DC power supply voltage to 10.0 V, using the multimeter to verify voltage output. 4. Power on the ventilator in normal ventilation mode on standby. 5. Verify that the ventilator's internal battery indicator LED is illuminated. 6. Slowly increase the external DC power supply voltage until the ventilator's DC power indicator LED illuminates. Verify: a. The ventilator's DC power indicator LED illuminates when the DC power supply voltage measures 10.5 V ± 0.3 V on the digital multimeter. b. Ventilator's AC power indicator LED is not illuminated. 7. Slowly decrease the external DC power supply voltage until the ventilator's internal battery indicator LED illuminates. Verify: a. The ventilator's internal battery indicator LED illuminates when the DC power supply voltage measures 9.8 V ± 0.3 V on the digital multimeter. b. Ventilator's DC power indicator LED is not illuminated. c. Ventilator displays the alarm message: AC Power Disconnection and on Internal Battery. 8. Press the ALARM CONTROL key to pause the audible alarm. 9. Very slowly increase the external DC power supply voltage until the ventilator's DC power indicator LED illuminates. Verify: a. The ventilator's DC power indicator LED illuminates when the DC power supply voltage measures 12.8 ± 0.30 V on the digital multimeter. b. The ventilator’s internal battery indicator LED turns off. Service Manual 6-27 Performance Verification 10. Reconnect the AC mains cord to the ventilator. Verify: a. AC power indicator LED illuminates. b. DC power indicator LED turns off. 6.13 Remote Alarm Test WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. To perform the remote alarm test: 1. Set up the ventilator with an adult patient circuit with exhalation valve and 1.0-liter test lung (Figure 6-14). 2. Connect the remote alarm test box cable to the ventilator (Figure 6-15). 6-28 Service Manual Performance Verification Figure 6-14. Remote Alarm Test Setup (front view) Figure 6-15. Remote Alarm Test Box Connected to Ventilator (rear view) Service Manual 6-29 Performance Verification 3. With the ventilator in normal ventilation mode on standby, set the following parameters: • • • • • • • • • • • P A/C Pi: 15 cmH2O PEEP: OFF Rise time: 2 R-Rate: 10 bpm Insp time: 1.3 s (I:E = 1:3.6 or I/T = 22%) Insp Sens: 5 VT Target: OFF VTI mL Min: OFF VTI mL Max: OFF R tot bpm High: OFF 4. Set the Alarm volume in the Preferences menu to medium. 5. Access the Alarms menu and turn off all settable alarms. 6. Set the multimeter to read ohms. 7. Connect the multimeter negative lead to the common connection on the test box and the positive lead to the normally closed connection. 8. Verify that the multimeter reads less than one (1) ohm (closed). 9. Connect the positive lead to the normally open connection and verify the multimeter reads open. 10. Move the multimeter positive lead to the normally closed pin (pin 3), and verify the multimeter reads less than one (1) ohm (closed). Figure 6-16. Remote Alarm Pin Diagram 3 4 5 6 2 1 1 2 3 4 8 relay common normally open (NO) normally closed (NC) not used 7 5 6 7 8 not used not used not used not used 11. Start ventilation by pressing Ventilation On/Off key on keypad. 12. Disconnect the AC power cord from the ventilator. 6-30 Service Manual Performance Verification 13. Verify that the multimeter reads open. 14. Verify that the AC power indicator LED is off and the internal battery indicator LED is illuminated. 15. Verify that the medium priority alarm sounds, the yellow alarm LED is flashing, and the AC POWER DISCONNECTION alarm is active. 16. Connect the AC power cord. 17. Connect the multimeter positive lead to the normally open connection on the test box and the negative multimeter lead to the common connection on the test box. 18. Verify that the multimeter reads open. 19. Disconnect the AC power cord. 20. Verify that the AC power indicator LED is off and the internal battery indicator LED is illuminated. 21. Verify that the multimeter reads less than one (1) ohm (closed). 22. Verify that the medium-priority alarm sounds, the yellow alarm LED flashes, and the AC POWER DISCONNECTION alarm is active. 23. Reconnect the AC power cord and verify that the multimeter reads open. 24. Stop ventilation using the Ventilation On/Off key. 6.14 Alarms Tests 6.14.1 AC Power Disconnection Alarm Test 1. Set up the ventilator with the adult patient circuit with exhalation valve and the 1.0-liter test lung. 2. With ventilator in normal ventilation mode on standby, set the following parameters: • • • • • • • • • • • Service Manual P A/C Pi: 15 cmH2O PEEP: OFF Rise time: 2 R-Rate: 10 bpm Insp time: 1.3 s (I:E = 1:3.6 or I/T = 22%) Insp Sens: 5 VT target: OFF VTI mL Min: OFF VTI mL Max: OFF R tot bpm High: OFF 6-31 Performance Verification 3. Access the alarms menu and turn off all settable alarms. 4. Press the Ventilation On/Off key to start ventilation. 5. Unplug the AC power cord from the ventilator. 6. Verify that the medium priority alarm sounds. 7. Verify that the amber alarm LED flashes continuously. 8. Verify that the AC POWER DISCONNECTION message appears in the alarm display area. 9. Reconnect the AC power cord to the ventilator. 10. Verify that the AC POWER DISCONNECTION alarm automatically resets. 6.14.2 Patient Disconnect Alarm 1. With the device still ventilating from the previous test, disconnect the inspiratory filter at the To Patient port. Verify: • high Priority alarm sounds within 15 seconds • red alarm LED (High Priority) flashes • LOW PRESSURE DISCONNECT* *IF PERSISTS RESTART/SRVC messages appear in the alarm display area. 2. Reconnect the inspiratory filter to the To Patient port. 3. Verify the alarm auto-resets. 4. Stop ventilation using the Ventilation On/Off key. 6.14.3 Power Off While Ventilating Test 1. Set up the ventilator with an adult patient circuit, exhalation valve and 1.0-liter hard sided test lung (same setup as previous test). 6-32 Service Manual Performance Verification 2. With the ventilator in normal ventilation mode on standby, set the following parameters (same settings as previous test): • • • • • • • • • • • P A/C Pi: 15 cmH2O PEEP: OFF Rise time: 2 R-Rate: 10 bpm Insp time: 1.3 s (I:E = 1:3.6 or I/T = 22%) Insp Sens: 5 VT target: OFF VTI mL Min: OFF VTI mL Max: OFF R tot bpm High: OFF 3. Start ventilation by pressing the Ventilation On/Off key. 4. While the device is ventilating, switch the ventilator OFF using the power switch (I/O). Verify: a. The VHP (very high priority) alarm sounds for a minimum of 120 seconds. b. Ventilation stops (no alarm LED illuminated nor any alarm message appears on display). 5. After 120 seconds has elapsed, press the Alarm Control key once to pause the audible alarm. 6. Power the ventilator ON using the power switch (I/O). 7. Verify that the ventilator immediately resumes ventilation. 8. Stop ventilation by pressing the Ventilation On/Off key. 6.15 Set Default Parameters/Time & Date Verification WARNING • Never perform any of the tests described in this chapter while a patient is connected to the ventilator. • This test requires you to work with exposed electronics connected to AC power. In order to prevent injury to yourself and damage to the ventilator, use extreme caution to keep hands and tools from touching electrical components. 1. Power on the ventilator in normal ventilation mode on standby. Service Manual 6-33 Performance Verification 2. Set the ventilator parameters, alarms, and preferences according to Table 6-4, Table 6-5, and Table 6-6. 3. Verify the time and date are current. Table 6-4. Default Ventilator Settings Parameter Setting Mode P A/C Pi 15 cmH2O PEEP OFF Rise Time 2 Respiratory rate 10 Insp time 1.3 s Insp Sens 2 VT Target OFF Table 6-5. Default Alarm Settings Alarm Setting VTI Low 300 mL; High 2000 mL Leak (l/min) (if applicable) High OFF Rtot High OFF Table 6-6. Default Preferences Preference Backlight Setting YES Contrast Alarm Volume 6-34 Key Sound Accept tone Waveforms display YES Pediatric Circuit NO Service Manual Performance Verification 6.16 Clear Faults Note: • • Clearing the fault log also clears the alarm log and the event log. Any faults must be addressed prior to completing Performance Verification. 1. Press and hold the Alarm Control key while using the main On/Off switch (I/O switch) to power on the ventilator in order to enter the SETUP screen. 2. Use the UP or DOWN arrow keys to place the cursor at the Maintenance position and press ENTER. 3. With the cursor at the Faults Check position, press and hold the Alarm Control key until a long beep sounds. 4. With the cursor at the Faults Check position, press ENTER to display the fault log. 5. Verify that NO DATA appears on the FAULTS screen. 6. Press ENTER to exit the FAULTS screen. 6.17 Reset Patient Hours Note: Resetting the patient hours will also reset the trends stored in the device memory in preparation for a new patient. 1. Press and hold the Alarm Control key while using the main On/Off switch, I/O switch, to power on the ventilator in order to enter SETUP mode. 2. Use the UP or DOWN arrow keys to place the cursor at the Patient Hours position. 3. Press ENTER. The cursor moves to the Reset Hours position. 4. Press ENTER. OFF flashes. 5. Press the UP or DOWN arrow keys to change the message to YES. 6. Press ENTER. 7. Verify that a long beep sounds and the patient counter display resets to 00000 h and 00 min. 8. Press the UP or DOWN arrow keys to exit the reset patient hours function. Service Manual 6-35 Performance Verification This page intentionally blank 6-36 Service Manual 7 Parts List This chapter identifies the repair parts available for the Puritan Bennett™ 520 Ventilator. 7.1 How to Use the Parts Lists This chapter shows various views of the entire ventilator system and its components. To use the parts lists, refer to the appropriate drawing for the part(s) you need to order. The following assembly drawings are provided: • • • • • major system components electrical system components pneumatic system components turbine assembly components labels. The corresponding table for each drawing lists the item number, part number, quantity required, and part description. If a part number does not appear, it is because it cannot be ordered individually. You must order the assembly, instead. If part numbers are listed, even though they may be included in an assembly, then these may be ordered individually. Abbreviations used in this chapter are listed in Table 7-1. Table 7-1. Abbreviations Abbreviation HEXALOBE Meaning Hexalobular fastener (Torx®) ID Inside Diameter OD Outside Diameter PCBA Printed Circuit Board Assembly 7-1 Parts List 7.2 Major System Components Table 7-2. Major System Component Part Numbers Item no. Figure 7-1 7-2 Part no. Qty 1 10000539 1 Keypad Description 2 3823200 1 Handle 3 10000545 1 Upper housing assembly (includes, keypad, handle with screws, and labels) -- not available separately order upper housing assembly -- Upper housing 4 10000561 1 Label kit (pneumatic cable diagram label) 5 2960600 2 Screw, HEXALOBE, M4 x 10, galvanized steel countersunk (2 required for handle; 5 required for housings) 6 2966100 2 Galvanized steel TCB screw HEXALOBE M3 x 5 7 3812500 1 Shielding plate motor harness 8 10053276 1 Turbine control PCBA (includes harness) 9 10028768 1 Turbine 10 3812400 4 Hexagonal spacer M/F M3 LG5 11 2970800 2 Exhalation solenoid valve mounting screw 12 10028753 1 LCD panel 13 10025114 4 Screw, M3 x 8 (LCD panel mounting screws) 14 10023294 4 LCD panel spacer 15 10025115 4 LCD panel washer 16 2957500 3 Galvanized steel TCB screw HEXALOBE D3.5 x 8 17 10000540 1 CPU PCBA with LCD panel 18 3818699 1 Exhalation solenoid valve 19 10000561 (label kit) 20 10028771 1 Filter, inlet air (pack of 6) 21 2399700 3 Adhesive collar (cable guides) 22 10000543 1 Lower housing assembly (compatible with original remote alarm harness 10028752) 10005328 1 Lower housing assembly (compatible with updated remote alarm harness 10005246) 23 2961500 4 Adhesive feet 12.7 x 12.7 24 2960600 5 Screw, HEXALOBE, M4 x 10, galvanized steel countersunk (2 required for handle; 5 required for housings) ESD label Service Manual Parts List Table 7-2. Major System Component Part Numbers Item no. Figure 7-1 Service Manual Part no. Qty Description 25 10000560 1 Inspiratory conical fitting assembly (with labels) 26 See Table 2-1 for country-specific part numbers 1 Power cable 27 not available separately: order power cord assembly 1 Cable grip, 6.6 x 4.3 28 not available separately: order power cord assembly 1 Clip, cable grip, 6.6 x 4.3 29 not available separately: order switch cover assembly 10028765 1 Cylindrical pin 2 x 28 stainless steel 30 not available separately: order switch cover assembly10028765 1 Switch cover -- 10028765 1 Switch cover assembly -- not available separately: order switch cover assembly 10028765 1 Cover spring -- 10000547 1 Exhalation cover (not shown) (see Figure 5-7 (item 2) see Figure 7-5 Item 1 10000561 (label kit) 1 Label, Exh valve/proximal pressure See Figure 7-5 Item 2 10000561 (label kit) 1 Label, To Patient (inspiratory) See Figure 7-6 Items 2 & 3 10000561 (label kit) 1 LabelO2/RA2 7-3 Parts List Figure 7-1. Major System Components 7-4 Service Manual Parts List 7.3 Electrical System Components Table 7-3. Electrical system component part numbers Item no. Figure 7-2 Quantity Description 1 10108395 1 Buzzer PCBA 2 10000540 1 CPU PCBA (includes LCD) 3 10028757 1 Battery connection PCBA 4 3810200 1 Stop, Battery connection PCBA 5 2957500 1 Zinc plated steel TCB screw HEXALOBE D3.5 x 8 (fastener for battery connection PCBA stop) 6 10028754 1 Fan with cable 7 10000265 2 Zinc plated steel TCB screw HEXALOBE D3 x 25 8 10005005 1 Power management PCBA 9 2957500 4 Zinc plated steel TCB screw HEXALOBE D3.5 x 8 10 2966300 4 Adhesive stop, diameter 8 mm, thickness 2.2 mm 11 10000541 1 Li- ion battery, assembly 2.4 Ah capacity (with labels) 10087046 1 Li- ion battery, assembly 2.4 Ah capacity (with labels). Requires minimum revision power management software AL020002. 12 2973900 2 Silicone stop 13 2960100 3 Screw, HEXALOBE D3 x 8, galvanized steel TCB 14 10000544 1 Battery cover assembly 15 10000561 (label kit) 1 Battery assembly label 16 10028752 1 Original remote alarm harness 10005246 1 Updated remote alarm harness 10028763 1 2-way solenoid valve, O2 17 Service Manual Part no. 18 3827900 1 Square support bracket, O2 valve 19 10053276 1 Turbine control PCBA 20 10028751 1 Power supply/turbine harness 21 10005005 1 Power management PCBA 22 10053278 1 CPU/Power supply harness 23 10000540 1 CPU PCBA (includes LCD) 24 -- 1 CPU/turbine harness (part of 10053276) - 10025113 1 Double sided tape (not shown) see Figure 5-31. - 2980100 1 Wire ferrite (not shown) see Figure 5-31. 7-5 Parts List Figure 7-2. Major Electrical Assemblies 7-6 Service Manual Parts List 7.4 Pneumatic System Components Table 7-4. Pneumatic System Component Part Numbers Service Manual Item no. Figure 7-3 Part no. Qty 1 2969600 2.75 in; 70 mm 2 2970400 1 3 2969600 2.75 in; 70 mm Silicone tubing, 1.6 mm ID x 4.8 mm OD 4 2969500 2.75 in; 70 mm Silicone tubing diameter 3.2 mm ID x 6.4 mm OD 5 2970300 1 6 2969600 2.75 in; 70 mm 7 2969500 2 in; 50 mm Silicone tubing diameter 3.2 mm ID x 6.4 mm OD 8 2963800 2 Galvanized steel countersunk screw HEXALOBE M3 x 8 (O2 valve bracket to lower housing) 9 3827900 1 Square support bracket, O2 valve 10 2100500 2 Tie-wrap (for O2 sol valve outlet, turbine inlet 11 2970800 2 Galvanized steel TCB screw HEXALOBE D3 x 6 (bracket screws) 12 10028763 1 2-way solenoid valve (O2) 13 2962799 1 Oxygen inlet connector Description Silicone tubing, 1.6 mm ID x 4.8 mm OD Tee connector, 2.4, plastic Straight connector, 2.4 x 3.2 plastic Silicone tubing, 1.6 mm ID x 4.8 mm OD 14 2962600 1 O2 female connector with valve 15 10038115 1 Turbine/inspiratory port connection tube 16 2966800 7.9 in; 200 mm Polyamide tubing 6 mm x 4 mm (0.2) 17 2969500 5.9 in; 150 mm Silicone tubing diameter 3.2 mm ID x 6.4 mm OD 18 2969500 7.9 in; 200 mm Silicone tubing diameter 3.2 mm ID x 6.4 mm OD 19 -- -- Inspiratory flow sensor OUT fitting Inspiratory flow sensor IN fitting 20 -- -- 21 2969600 4.75 in; 120 mm Silicone tubing, 1.6 mm ID x 4.8 mm OD 22 2969600 4.75 in; 120 mm Silicone tubing, 1.6 mm ID x 4.8 mm OD 23 -- -- CPU PCBA bottom view 7-7 Parts List Figure 7-3. Pneumatic Components and Connection Diagram 23 7-8 Service Manual Parts List 7.5 Turbine Assembly Components Table 7-5. Turbine Assembly Component Part Numbers Service Manual Item no. Figure 7-4 Part no. Qty 1 2391200 2 Black foam - width 40 mm; thickness 10 mm 2 10028768 1 Turbine Description 3 2877500 2 Neoprene adhesive strip 4 2971600 (items 4 - 6 sold packaged together) 1 Zn plated steel TCB Screw 5 -- -- 6 -- -- M3 fender washer C-clamp (toroid clamp) 7-9 Parts List Figure 7-4. Turbine Assembly Drawing 7-10 Service Manual Parts List 7.6 Label Kit Table 7-6 lists the contents of the complete label kit and the general locations of each label. The subsequent tables break the kit down by location and correspond to the illustrations on their respective facing pages. Table 7-6. Label Kit, P/N10000561 Service Manual Description Location Label, Air inlet Lower housing, back of ventilator (see Figure 7-6 Item 1) Label, Battery assembly Inside battery cover (see Figure 7-2 Item 15) Label, ESD Inside ventilator, lower housing (see (Item 19) Label O2/RA (remote alarm portion) Lower housing, back of ventilator (see Figure 7-6 Item 2) Label O2/RA(O2 portion) Battery cover (see Figure 7-6 Item 3) Label, Pneumatic cabling Inside ventilator, upper housing (see Figure 7-2 Item 4) Label, exhalation valve/proximal pressure Front of ventilator, on inspiratory block (see Figure 7-5 Item 1) Label, To Patient (inspiratory) Front of ventilator, on inspiratory block (see Figure 7-5 Item 2) Label, identification Bottom of ventilator (see Figure 7-7 Item 1) Label, polyester blank (serial number window) Under product ID label 7-11 Parts List Figure 7-5. Front Panel Labels Table 7-7. Front Panel Labels 7-12 Item no. Figure 7-5 Part no. Qty -- 10000561 -- label kit 1 -- 1 Label, exhalation valve/proximal pressure 2 -- 1 Label, To Patient (inspiratory) Description Service Manual Parts List Figure 7-6. Rear Panel Labels Table 7-8. Rear Panel Labels Service Manual Item no. Figure 7-6 Part no. Qty. -- 10000561 -- Label kit 1 -- 1 Label, air inlet 2 -- 1 Label, O2/RA (remote alarm portion) 3 -- 1 Label, O2/RA (O2 portion) Description 7-13 Parts List Figure 7-7. Bottom Panel Label l Table 7-9. Bottom Panel Label Item no. Figure 7-7 1 7-14 Part no. 10000561 (label kit) Qty. 1 Description Product identification label Service Manual AAppendix A A.1 Overview This appendix contains diagrams for the Puritan Bennett™ 520 Ventilator referenced in Chapter 3. Figure A-1. Pneumatic Block Diagram A-1 Appendix A 1 Turbine control PCBA 2 Inlet air filter 17 Display PCBA 18 CPU PCBA 3 Turbine 4 Exhalation solenoid valve 19 Battery connection PCBA 20 Internal battery 5 Exhalation valve pressure sensor 6 Inspiratory block 21 Cooling fan 22 Power supply (located above power management PCBA) 23 Power switch 7 Inspiratory flow sensor 8 Inspiratory bacteria filter 9 Inspiratory tubing 10 Exhalation valve pilot tube 11 Exhalation valve 12 Exhalation valve exhaust port 13 Proximal pressure tube 14 Inspiratory pressure sensor 15 Proximal pressure sensor 16 Buzzer PCBA 24 AC input 25 DC input 26 PC port 27 Type A USB ports (2) 28 SpO2 port (not used) 29 Nurse call port 30 Low pressure O2 inlet 31 O2 solenoid valve Figure A-2. Power Management PCBA Block Diagram A-2 Service Manual Appendix A Figure A-3. Exhalation Solenoid Valve During Inspiration And Exhalation 1 Turbine flow applied to port 1 To patient circuit 2 exhalation valve and exhalation pressure transducer Service Manual 3 Port 3 vents to atmosphere A-3 This page intentionally blank A-4 Service Manual Index Numerics 3V battery, removal and replacement . . . .5-26 to 5-28 A Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 Buzzer PCBA Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 Removal and replacement . . . . . . . . . . . .5-29 to 5-31 absolute pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16 accessories, list of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 adhesive feet, removal and replacement . . . . . . . . 5-12 Alarm settings CPAP mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Pressure A/C mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 PSV ST mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 Alarms AC POWER DISCONNECTION . . . . . . . . . . . . . . . . . 4-13 APNEA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 BATTERY FAULT1 . . . . . . . . . . . . . . . . . . . . .4-14 to 4-15 BATTERY FAULT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15 BUZZER FAULT1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28 BUZZER FAULT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29 BUZZER FAULT3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29 BUZZER FAULT4 . . . . . . . . . . . . . . . . . . . . . . . 4-29, 4-30 CHECK PROXIMAL LINE 1 . . . . . . . . . . . . . . . . . . . . . 4-19 CONNECT VALVE OR CHANGE PRESS . . . . . . . . . 4-20 COOLING FAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21 DEVICE FAULT 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23 DEVICE FAULT 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23 DEVICE FAULT 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23 DEVICE FAULT 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23 DEVICE FAULT 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21 DEVICE FAULT 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23 DEVICE FAULT6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22 EMPTY BATTERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23 INCOMPATIBLE SOFTWARE VERSION . . . . . . . . . 4-24 INTENTIONAL VENT STOP . . . . . . . . . . . . . . . . . . . . 4-24 KEYBOARD FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24 LOW BATTERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24 OCCLUSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25 Power supply loss (no message) . . . . . . . . . . . . . . 4-27 REMOTE ALARM FAULT . . . . . . . . . . . . . . . . . . . . . . 4-27 Atmospheric pressure sensor See Barometric pressure sensor C B Handle, removal and replacement. . . . . . . . . . . . . . . 5-17 high priority alarm indicator . . . . . . . . . . . . . . . . . . . . 2-29 Hours, how to reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43 Housing, disassembly and assembly . . . . . .5-14 to 5-17 Barometric pressure sensor . . . . . . . . . . . . . . . . . . . . . . 3-7 Battery Charging and discharging. . . . . . . . . . . . . . . . . . . . 3-10 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 Removal and replacement . . . . . . . . . . . .5-13 to 5-14 Battery Connection PCBA Service Manual Calibration Patient (proximal) pressure sensor. . . . .6-15 to 6-16 cleaning solutions Disinfectants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 Consumable parts, list of . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 control panel See Keypad CPU PCBA Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 D default settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34 disposable parts See Consumable parts E Electromagnetic emissions and immunity, manufacturer’s declaration . . . . . . . . . .2-16 to 2-22 Exhalation solenoid valve description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 removal and replacement . . . . . . . . . . . . .5-19 to 5-20 Exhalation valve (internal valve) pressure sensor description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 External inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 F Fan description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 removal and replacement . . . . . . . . . . . . . . . . . . . . 5-39 Faults, technical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Troubleshooting table . . . . . . . . . . . . . . . . . . . . . . . 4-10 H I Indicators Index-1 Index AC power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 DC power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Internal battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 ventilator status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Inlet air filter description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 removal and replacement. . . . . . . . . . . . . . . . . . . . . 5-9 inlet silencer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Inspiration flow calibration. . . . . . . . . . . . . . . . . . . . . . 6-17 Inspiratory block cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 removal and replacement. . . . . . . . . . . . .5-28 to 5-29 Inspiratory flow sensor description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 inspiratory pressure sensor . . . . . . . . . . . . . . . . . . . . . . 3-7 Internal battery charging and discharging . . . . . . . . . . . . . . . . . . . . 3-10 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 Removal and replacement . . . . . . . . . . . .5-13 to 5-14 invasive ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16 K Keypad Controls and indicators . . . . . . . . . . . . . . .2-29 to 2-31 Removal and replacement . . . . . . . . . . . .5-17 to 5-18 Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Alarm control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 Down arrow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 down arrow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Enter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Up arrow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 up arrow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Ventilation ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 L labeling checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 Labels Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . .2-32 to 2-33 Parts lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-11 to 7-14 Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-33 to 2-34 Side panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38 LCD panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13 Removal and replacement . . . . . . . . . . . .5-24 to 5-26 leak compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 M maintenance mode, how to access . . . . . . .2-42 to 2-44 manufacturer’s declaration . . . . . . . . . . . . . .2-16 to 2-22 medium priority alarm indicator . . . . . . . . . . . . . . . . 2-29 microcontroller functions . . . . . . . . . . . . . . . . . . . . . . . 3-11 Index-2 Monitored patient data Apnea index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Apnea time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Expiratory time (E time) . . . . . . . . . . . . . . . . . . . . . . 2-12 I:E ratio (I:E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 I:T ratio (I/T). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Inspiratory tidal volume (VTI) . . . . . . . . . . . . . . . . . 2-12 Inspiratory time (I time) . . . . . . . . . . . . . . . . . . . . . . 2-13 Leak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Peak inspiratory pressure (PIP). . . . . . . . . . . . . . . . 2-13 Positive end expiratory pressure (PEEP) . . . . . . . 2-13 Spontaneous cycles . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Total respiratory rate (R tot) . . . . . . . . . . . . . . . . . . 2-13 N non-invasive ventilation . . . . . . . . . . . . . . . . . . . . . . . . 3-16 nurse call port See remote alarm port O ON/OFF switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34 outlet silencer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 oxygen inlet valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Oxygen solenoid valve Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Performance verification tests Oxygen solenoid functional test . . . .6-21 to 6-22 Removal and replacement . . . . . . . . . . . .5-31 to 5-32 P patient (proximal) pressure sensor, calibration . . . . . . . 6-15 to 6-16 patient circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 to 3-8 patient hours, how to reset. . . . . . . . . . . . . . . . . . . . . . 2-43 PB 520 Alarm settings CPAP mode High inspired tidal volume (High VTI) . . . . . . 2-12 High leak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 High respiratory rate (high Rtot) . . . . . . . . . . . 2-12 Low inspired tidal volume (Low VTI) . . . . . . . 2-12 Pressure A/C mode High inspired tidal volume (high VTI) . . . . . . 2-11 High leak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 High respiratory rate (high Rtot) . . . . . . . . . . . 2-11 Low inspired tidal volume (low VTI) . . . . . . . . 2-11 PSV ST mode High inspiratory time (high I time) . . . . . . . . . 2-11 High inspired tidal volume (high VTI) . . . . . . 2-11 High leak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 High respiratory rate (high Rtot) . . . . . . . . . . . 2-12 Low inspiratory time (low I time). . . . . . . . . . . 2-11 Low inspired tidal volume (low VTI) . . . . . . . . 2-11 PB 520 ventilator exhalation solenoid valve diagram . A-3 PB 520 ventilator Pneumatic block diagram. . . . . . . A-1 Service Manual Index PB 520 ventilator power management PCBA block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 PB 520 Ventilator settings Apnea time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 Backup rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 Exhalation sensitivity (exh sens) . . . . . . . . . . . . . . . 2-9 I:E ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 I/T ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Inspiratory sensitivity (Insp Sens) . . . . . . . . . . . . . . 2-9 Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 PEEP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Pressure control (P Control) . . . . . . . . . . . . . . . . . . 2-10 Pressure support (P Support) . . . . . . . . . . . . . . . . . 2-10 Respiratory rate (R-Rate) . . . . . . . . . . . . . . . . . . . . . 2-10 Rise time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Vt target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Performance verification tests AC/DC/battery power switching test. . . . . . . . . . 6-27 Alarm buzzer verification. . . . . . . . . . . . . . . . . . . . . . 5-7 Back-up alarm verification. . . . . . . . . . . . . . . . . . . . . 5-7 Barometric pressure sensor verification . . . . . . . . 5-7 Blower temperature check . . . . . . . . . . . . . . . . . . . . 5-7 Electrical safety test . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6 Exhalation valve alarm test . . . . . . . . . . . . . . . . . . . 6-33 Flow sensor capacity test. . . . . . . . . . . . . . . . . . . . . 6-19 Internal 24 V verification . . . . . . . . . . . . . . . . . . . . . . 5-7 Internal battery information verification . . . . . . . 5-8 Internal temperature check . . . . . . . . . . . . . . . . . . . 5-7 Patient disconnect alarm test. . . . . . . . . . . . . . . . . 6-33 Patient pressure sensors calibration . . .6-15 to 6-16 Remote alarm test . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29 Set default parameters/time & date verification . . . 6-34 Turbine performance test . . . . . . . . . . . . . . . . . . . . 6-19 Watchdog voltage verification . . . . . . . . . . . . . . . . 5-7 Power Management PCBA description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 to 3-12 removal and replacement . . . . . . . . . . . . .5-37 to 5-38 power source priority and switching. . . . . . . . . . . . . 3-10 Preventive maintenance parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-26 to 2-27 proximal pressure sensor . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Puritan Bennett 520 ventilator, intended use . . . . . 2-2 Specifications Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 to 2-13 Technical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 to 2-8 symbols, onscreen and device label . . . . . .2-39 to 2-41 T Technical faults Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 How to troubleshoot. . . . . . . . . . . . . . . . . .4-10 to 4-12 Temperature sensor Ventilator compartment . . . . . . . . . . . . . . . . . . . . . 3-15 tools, required for service . . . . . . . . . . . . . . . .2-22 to 2-23 Troubleshooting Miscellaneous symptoms . . . . . . . . . . . . .4-33 to 4-34 Technical faults . . . . . . . . . . . . . . . . . . . . . . .4-10 to 4-12 Ventilation alarms . . . . . . . . . . . . . . . . . . . .4-12 to 4-30 Turbine assembly Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 Removal and replacement . . . . . . . . . . . .5-33 to 5-34 Turbine Control PCBA Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 Removal and replacement . . . . . . . . . . . .5-34 to 5-35 U USB interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11 V ventilator compartment temperature sensor . . . . 3-15 Vt target. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 W warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 R relative pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16 remote alarm port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 S serial number, how to find . . . . . . . . . . . . . . . . . . . . . . 2-42 service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45 settings, default . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14, 6-34 setup screen, how to access . . . . . . . . . . . . . .2-42 to 2-44 software lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39 software version, how to find . . . . . . . . . . . . . . . . . . . 2-42 Service Manual Index-3 Index This page intentionally blank Index-4 Service Manual Part No. 10000274 Rev G 2017-05 ©2011 Covidien. Made in Ireland Covidien llc, 15 Hampshire Street, Mansfield MA 02408 USA. Covidien Ireland Limited, IDA Business & Technology Park, Tullamore. www.covidien.com [T] 1 800 635 5267 ">
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Key features
- Volume target
- Leak compensation
- Circuit detection & management
- Invasive & non-invasive ventilation
- Alarm system
- Internal battery
- Accessory compatibility
Frequently asked questions
The manual does not list specific ventilation modes. It mentions features like volume target, leak compensation, and circuit detection & management, suggesting that it supports various modes.
It has alarms for low oxygen levels, pressure problems, and other potential issues. These alarms are classified into different categories to help with proper response.
Yes, the 520 is compatible with a wide range of patient circuits and accessories, allowing for flexibility in patient care.
