Nihon Kohden JE-912AK PSG Input Box Service manual

EEG-1100A

EEG-1100J

EEG-1100K

EEG-1100G

EEG-9100A

EEG-9100J

EEG-9100K

EEG-9100G

EEG-9200A

EEG-9200J

EEG-9200K

EEG-9200G

PSG INPUT BOX

JE-912AK

0634-001691A

CONTENTS

Contents

GENERAL HANDLING PRECAUTIONS ....................................................................... i

WARRANTY POLICY ................................................................................................... ii

Conventions Used in this Manual and Instrument ....................................................... iv

Warnings, Cautions and Notes .......................................................................... iv

Explanations of the Symbols in this Manual and Instrument ............................. iv

Precautions for Input Jack Use ..................................................................................... v

Section 1 General....................................................................................1C.1

Introduction ......................................................................................................................... 1.1

Features ................................................................................................................... 1.1

General Safety information ................................................................................................. 1.2

Panel Descriptions .............................................................................................................. 1.7

JE-912AK PSG Input Box ......................................................................................... 1.7

JE-914A Mini Junction Box ....................................................................................... 1.9

Section 2 Troubleshooting and Error Messages ..................................2C.1

How to Troubleshoot ........................................................................................................... 2.1

Closing the Program and Shutting Down Windows ........................................ 2.2

Troubleshooting .................................................................................................................. 2.3

Waveform Acquisition ............................................................................................... 2.3

Control ...................................................................................................................... 2.6

Error Messages .................................................................................................................. 2.7

Acquisition Program ................................................................................................. 2.7

SpO

2

Measurement .................................................................................................. 2.8

Section 3 Board Description ..................................................................3C.1

General ............................................................................................................................... 3.1

Block Diagram .......................................................................................................... 3.1

PSG INPUT Board and PSG AMP Board ........................................................................... 3.2

PSG MOTHER Board ......................................................................................................... 3.6

Settings When Using Two PSG Input Boxes ....................................................................... 3.8

Section 4 Disassembly ...........................................................................4C.1

Before You Begin ...................................................................................................... 4.1

Warnings, Cautions and Notes ................................................................................. 4.1

Required Tools .......................................................................................................... 4.1

Disassembly ....................................................................................................................... 4.2

Section 5 Maintenance ...........................................................................5C.1

Checking the PSG Input Box .............................................................................................. 5.1

Service Manual JE-912AK 1

CONTENTS

Checking Noise ......................................................................................................... 5.1

Checking the Skin-electrode Impedance Check Function ........................................ 5.2

Checking the EEG Input Circuit ................................................................................ 5.3

Checking the Amplifier .................................................................................... 5.3

Checking the Input Signal for Each Channel .................................................. 5.4

Section 6 Replaceable Parts List ...........................................................6C.1

JE-912AK PSG Input Box ................................................................................................... 6.2

JE-914A Mini Junction Box ................................................................................................. 6.4

Section 7 Connector Pin Assignment ...................................................7C.1

Input/Output Connector/Jack Pin Assignment .................................................................... 7.1

PSG Input Box .......................................................................................................... 7.1

SpO

2

Connector .............................................................................................. 7.1

DC Input Connector ........................................................................................ 7.1

REMOTE MARK Connector ........................................................................... 7.1

C.2

Service Manual JE-912AK

GENERAL HANDLING PRECAUTIONS

This device is intended for use only by qualified medical personnel.

Use only Nihon Kohden approved products with this device. Use of non-approved products or in a non-approved manner may affect the performance specifications of the device. This includes, but is not limited to, batteries, recording paper, pens, extension cables, electrode leads, input boxes and AC power.

Please read these precautions thoroughly before attempting to operate the instrument.

1.

To safely and effectively use the instrument, its operation must be fully understood.

2.

When installing or storing the instrument, take the following precautions:

(1) Avoid moisture or contact with water, dust, extreme atmospheric pressure, excessive humidity and temperatures, poorly ventilated areas, and saline or sulphuric air.

(2) Place the instrument on an even, level floor. Avoid vibration and mechanical shock, even during transport.

(3) Avoid placing in an area where chemicals are stored or where there is danger of gas leakage.

(4) The power line source to be applied to the instrument must correspond in frequency and voltage to product specifications, and have sufficient current capacity.

(5) Choose a room where a proper grounding facility is available.

3.

Before Operation

(1) Check that the instrument is in perfect operating order.

(2) Check that the instrument is grounded properly.

(3) Check that all cords are connected properly.

(4) Pay extra attention when the instrument is in combination with other instruments to avoid misdiagnosis or other problems.

(5) All circuitry used for direct patient connection must be doubly checked.

(6) Check that battery level is acceptable and battery condition is good when using battery-operated models.

4.

During Operation

(1) Both the instrument and the patient must receive continual, careful attention.

(2) Turn power off or remove electrodes and/or transducers when necessary to assure the patient’s safety.

(3) Avoid direct contact between the instrument housing and the patient.

5.

To Shutdown After Use

(1) Turn power off with all controls returned to their original positions.

(2) Remove the cords gently; do not use force to remove them.

(3) Clean the instrument together with all accessories for their next use.

6.

The instrument must receive expert, professional attention for maintenance and repairs. When the instrument is not functioning properly, it should be clearly marked to avoid operation while it is out of order.

7.

The instrument must not be altered or modified in any way.

8.

Maintenance and Inspection:

(1) The instrument and parts must undergo regular maintenance inspection at least every 6 months.

(2) If stored for extended periods without being used, make sure prior to operation that the instrument is in perfect operating condition.

Service Manual JE-912AK i

(3) Technical information such as parts list, descriptions, calibration instructions or other information is available for qualified user technical personnel upon request from your Nihon Kohden distributor.

9.

When the instrument is used with an electrosurgical instrument, pay careful attention to the application and/or location of electrodes and/or transducers to avoid possible burn to the patient.

10. When the instrument is used with a defibrillator, make sure that the instrument is protected against defibrillator discharge. If not, remove patient cables and/or transducers from the instrument to avoid possible damage.

WARRANTY POLICY

Nihon Kohden Corporation (NKC) shall warrant its products against all defects in materials and workmanship for one year from the date of delivery. However, consumable materials such as recording paper, ink, stylus and battery are excluded from the warranty.

NKC or its authorized agents will repair or replace any products which prove to be defective during the warranty period, provided these products are used as prescribed by the operating instructions given in the operator’s and service manuals.

No other party is authorized to make any warranty or assume liability for NKC’s products. NKC will not recognize any other warranty, either implied or in writing. In addition, service, technical modification or any other product change performed by someone other than NKC or its authorized agents without prior consent of NKC may be cause for voiding this warranty.

Defective products or parts must be returned to NKC or its authorized agents, along with an explanation of the failure.

Shipping costs must be pre-paid.

This warranty does not apply to products that have been modified, disassembled, reinstalled or repaired without Nihon

Kohden approval or which have been subjected to neglect or accident, damage due to accident, fire, lightning, vandalism, water or other casualty, improper installation or application, or on which the original identification marks have been removed.

In the USA and Canada other warranty policies may apply.

CAUTION

United States law restricts this device to sale by or on the order of a physician.

ii Service Manual JE-912AK

EMC RELATED CAUTION

This equipment and/or system complies with the International Standard IEC60601-1-2 for electromagnetic compatibility for medical electrical equipment and/or system. However, an electromagnetic environment that exceeds the limits or levels stipulated in the IEC60601-1-2, can cause harmful interference to the equipment and/or system or cause the equipment and/or system to fail to perform its intended function or degrade its intended performance. Therefore, during the operation of the equipment and/or system, if there is any undesired deviation from its intended operational performance, you must avoid, identify and resolve the adverse electromagnetic effect before continuing to use the equipment and/or system.

The following describes some common interference sources and remedial actions:

1.Strong electromagnetic interference from a nearby emitter source such as an authorized radio station or cellular phone:

Install the equipment and/or system at another location if it is interfered with by an emitter source such as an authorized radio station. Keep the emitter source such as cellular phone away from the equipment and/or system.

2.Radio-frequency interference from other equipment through the AC power supply of the equipment and/ or system:

Identify the cause of this interference and if possible remove this interference source. If this is not possible, use a different power supply.

3.Effect of direct or indirect electrostatic discharge:

Make sure all users and patients in contact with the equipment and/or system are free from direct or indirect electrostatic energy before using it.

4.Electromagnetic interference with any radio wave receiver such as radio or television:

If the equipment and/or system interferes with any radio wave receiver, locate the equipment and/or system as far as possible from the radio wave receiver.

If the above suggested remedial actions do not solve the problem, consult your Nihon Kohden

Corporation subsidiary or distributor for additional suggestions.

The CE mark is a protected conformity mark of the European Community. The products herewith comply with the requirements of the Medical Device Directive 93/42/EEC.

This equipment complies with EUROPEAN STANDARD EN-60601-1-2 (1993) which requires EN-55011, class B.

Service Manual JE-912AK iii

Conventions Used in this Manual and Instrument

Warnings, Cautions and Notes

Warnings, cautions and notes are used in this manual to alert or signal the reader to specific information.

WARNING

A warning alerts the user to possible injury or death associated with the use or misuse of the instrument.

CAUTION

A caution alerts the user to possible injury or problems with the instrument associated with its use or misuse such as instrument malfunction, instrument failure, damage to the instrument, or damage to other property.

NOTE

A note provides specific information, in the form of recommendations, prerequirements, alternative methods or supplemental information.

Explanations of the Symbols in this Manual and Instrument

The following symbols found in this manual/instrument bear the respective descriptions as given.

Symbol Description Symbol Description

Type BF applied part Date of manufacture

Attention, consult operator’s manual

The CE Mark is a protected conformity mark of European

Community. The products herewith comply with the requirements of the Medical

Device Directive 93/42/EEC. iv Service Manual JE-912AK

Precautions for Input Jack Use

NOTE

Do not perform EEG measurement without the Z, C3, C4, A1 and A2 electrodes.

Use of input jack Z

Connect the lead from the electrode (Z electrode) attached on the patient’s nasion to the input jack Z on the electrode junction box. The purpose of this input jack is to eliminate AC interference positively.

NOTE

The input jack Z is also used for checking electrode impedance.

Use of input jacks C3 and C4

Connect the leads from the electrodes attached on the positions C3 and C4 to the input jacks C3 and C4 respectively.

NOTE

•••••

The C3 and C4 electrodes are the reference electrodes for EEG measurement.

•••••

The input jacks C3 and C4 must be attached for EEG measurement even when the C3 and C4 are not programmed in any montage.

Use of input jacks A1 and A2, C3 and C4 during skin-electrode impedance check

When checking each electrode impedance, connect the leads from the electrode attached on the positions A1, A2, C3 and

C4 to the input jacks A1, A2, C3 and C4 respectively.

NOTE

•••••

The A1 and A2 electrodes are the reference electrodes for skin-electrode impedance check.

•••••

The input jacks A1 and A2 in addition to the Z, C3 and C4must be attached for the electrode impedance check.

A1

A2

C3

C4

O1

O2

X1

X2

X3

X4

Z

BODY POSITION

DC2

ECG AIRFLOW

X15 X19

X5

X6

X7

PLM 1

X16

X8

CHEST

X20

X9

X10

PLM 2

X17

X11

X12

X13

X18

ABDOMEN

X21

X14

JE-914A Mini Junction Box

Checking electrode potentials for all active electrodes

Check the original electrode potential for all active electrodes by programming a montage with the system reference electrode (Select the 0 V button for reference electrode on the Montage dialog box).

Refer to “Programming Patterns” in Section 2 of the Operator’s manual.

The digital EEG displays the EEG waveform in each channel by subtracting two electrode potentials selected to a montage. The subtracted result will be incorrect, if the electrode attachment is not correct, the original electrode potential is flat or unstable, or artifact is superimposed on the original electrode potential. Omit the measurement result if the displayed EEG waveform is incorrect.

Service Manual JE-912AK v

This page is intentionally left blank.

vi Service Manual JE-912AK

Section 1 General

Introduction ........................................................................................................................ 1.1

Service Policy, Service Parts and Patient Safety Checks .................................................. 1.2

Service Policy .......................................................................................................... 1.2

Service Parts ........................................................................................................... 1.2

Patient Safety Checks ............................................................................................. 1.3

Maintenance Equipment/Tools ................................................................................. 1.3

General Information on Servicing ...................................................................................... 1.4

General Safety information ................................................................................................ 1.6

Specifications .................................................................................................................... 1.11

Panel Descriptions ........................................................................................................... 1.13

JE-912AK PSG Input Box ...................................................................................... 1.13

JE-914A Mini Junction Box .................................................................................... 1.15

Composition ..................................................................................................................... 1.16

Service Manual JE-912AK 1C.1


1C.2


Introduction

1. GENERAL

The JE-912AK PSG Input Box is an electrode junction box to measure polysomnogram. The PSG input box communicates with an electroencephalograph by USB communication. Up to 8 DC signals and SpO

2

can be measured.

This service manual provides useful information to qualified service personnel to understand, troubleshoot, service, maintain and repair this JE-912AK PSG Input

Box.

All replaceable parts or units of this instrument and its optional units are clearly listed with exploded illustrations to help you locate the parts quickly.

The “Maintenance” section in this service manual only describes the maintenance that should be performed by qualified service personnel. The Maintenance section in the operator’s manual describes the maintenance that can be performed by the user.

The information in the operator’s manual is primarily for the user. However, it is important for service personnel to thoroughly read the operator’s manual and service manual before starting to troubleshoot, service, maintain or repair this instrument. This is because service personnel need to understand the operation of the instrument in order to effectively use the information in the service manual.

CAUTION

To turn the power off, follow the procedure in “Power Off Procedure” in Section 3 of the EEG operator’s manual. Do not press the power button on the PC unit. If the power button is pressed while a program is running, the program, data file in the hard disk and/or MO disk may be damaged.


Trademarks

Windows is a registered trademarks of Microsoft Corporation.

1.1

1. GENERAL

Service Policy, Service Parts and Patient Safety Checks

Service Policy

Our technical service policy for this PSG input box is to replace the faulty unit, board or part or damaged mechanical part with a new one. Do not perform electrical device or component level repair of the multilayer board or unit. We do not support component level repair outside the factory for the following reasons:

• Most of the boards are multilayer boards with surface mount electrical devices (SMD), so the mounting density of the board is too high.

• A special tool or high degree of repair skill is required to repair the multilayer boards with SMDs.

Disassemble the PSG input box or replace a board or unit in an environment where the PSG input box is protected against static electricity.

As background knowledge for repair, pay special attention to the following:

• You can reduce the repair time by considering the problem before starting repair.

• You can clarify the source of most of the troubles using the information from the troubleshooting tables. Refer to “Troubleshooting“ of this manual.

Service Parts

Refer to “Replaceable Parts List” of this manual for the service parts for technical service that we provide.

NOTE

When ordering parts or accessories from your Nihon Kohden representative, please quote the NK code number and part name which is listed in this service manual, and the name or model of the unit in which the required part is located. This will help us to promptly attend to your needs. Always use parts and accessories recommended or supplied by Nihon Kohden Corporation to assure maximum performance from your PSG input box.

1.2


Patient Safety Checks

1. GENERAL

Periodic maintenance procedures and diagnostic check procedures are provided in this manual to ensure that the PSG input box is operating in accordance with its design and production specifications. To verify that the PSG input box is working in a safe manner with regard to patient safety, patient safety checks should be performed on the PSG input box before it is first installed, periodically after installation, and after any repair is made on the PSG input box.

For patient safety checks, perform the following checks as described in the

IEC60601-1 “Medical electrical equipment - Part 1: General requirements for safety”:

• Protective earth resistance check

• Earth leakage current check

• Enclosure leakage current check

• Patient leakage current check

• Withstanding voltage check

Maintenance Equipment/

Tools

Test equipment

When repairing or calibrating the PSG input box, the following test equipment is required.

• Oscillator: standard type

Checking tool

When checking the internal noise of the PSG input box and skin-electrode impedance check function, the checking tools are necessary. Refer to Section 5

“Maintenance”.

Service Manual JE-912AK 1.3

1. GENERAL

General Information on Servicing

Note the following information when servicing the PSG input box.

CAUTION

Safety

There is the possibility that the outside surface of the PSG input box, such as the operation keys, could be contaminated by contagious germs, so disinfect and clean the PSG input box before servicing it.

When servicing the PSG input box, wear rubber gloves to protect yourself from infection.

Liquid ingress

The PSG input box is not waterproof, so do not install the PSG input box where water or liquid can get into or fall on the PSG input box. If liquid accidentally gets into the PSG input box or the PSG input box accidentally drops into liquid, disassemble the PSG input box, clean it with clean water and dry it completely. After reassembling, verify that there is nothing wrong with the patient safety checks and function/ performance checks. If there is something wrong with the PSG input box, contact your Nihon Kohden representative to repair it.

Disinfection and cleaning

To disinfect the outside surface of the PSG input box, wipe it with a non-abrasive cloth moistened with any of the disinfectants listed below. Do not use any other disinfectants or ultraviolet rays to disinfect the PSG input box.

- Chlorohexidine gluconate solution:

- Benzethonium chloride solution:

- Glutaraldehyde solution:

- Benzalkonium chloride:

- Hydrochloric alkyldiaminoethylglycine:

0.5%

0.2%

2.0%

0.2%

0.5%

Transport

• Use the specified shipment container and packing material to transport the PSG input box. If necessary, double pack the PSG input box. Also, put the PSG input box into the shipment container after packing so that the buffer material does not get inside the PSG input box.

1.4


1. GENERAL

Caution - continued

• When transporting the board or unit of the PSG input box, be sure to use a conductive bag. Never put the it in an aluminum bag to transport a bord or unit which a lithium battery is mounted. Never wrap the board or unit of the PSG input box and mini junction box in a styrene foam or plastic bag which generates static electricity.

Handling the PSG input box

• Because the outside surface of the PSG input box is made of resin, the outside surface of the PSG input box is easily damaged. So when handling the PSG input box, remove clutter from around the PSG input box and be careful to not damage the PSG input box or get it dirty.

• Because most of the boards in the PSG input box are multilayer boards with surface mount electrical devices (SMD), a special tool is required if remove and solder the elctrical devices on it. To avoid damaging other electrical components, do not remove and solder

SMD components yourself.

Measuring and Test Equipment

Maintain the accuracy of the measuring and test equipment by checking and calibrating it according to the check and calibration procedures.


1. GENERAL

General Safety information

1.6

WARNING

• Never use this PSG input box in the presence of any flammable anesthetic gas or high-concentration oxygen atmosphere. Failure to follow this warning may cause explosion or fire.

• Never use this PSG input box in a high-pressure oxygen medical tank.

Failure to follow this warning may cause explosion or fire.

Using with an electrical surgical unit (ESU)

• Never use this PSG input box near an ESU. The PSG input box may malfunction due to high-frequency noise from the ESU.

• When using this PSG input box with an ESU, refer to the instruction manual for the ESU. Before measurement, check that the return plate is correctly attached to the patient and that the PSG input box operates correctly when using with the ESU. If the return plate is not attached correctly, it may burn the patient’s skin where the electrodes are attached.

• Before using the ESU, remove all needle electrodes and silver ball electrodes from the patient. Failure to follow this warning may cause burn on the patient.

MRI examination

• The PSG input box is not intended to be used during MRI.

• When performing MRI tests, remove all electrodes and transducers from the patient which are connected to this PSG input box. Failure to follow this warning may cause serious electrical burn on the patient due to local heating caused by dielectric electromotive force. For details, refer to the instruction manual for the MRI.

When performing defibrillation

• Before defibrillation, remove from the patient all electrodes and transducers which are connected to connectors that do not have a

“ ” or “ ” mark. Otherwise, the discharged energy may cause serious electrical burn or shock to the operator.

• Before defibrillation, remove all electrodes and transducers from the patient which are connected from this PSG input box. If the defibrillator paddle directly contacts these materials, the discharged energy may cause serious electrical burn to the patient.

• Before defibrillation, all persons must keep clear of the bed and must not touch the patient or any equipment connected to the patient.

Failure to follow this warning may cause serious electrical burn, shock or other injury.


Installation

1. GENERAL

WARNING

Connect only the specified instruments to the connectors or socket marked with , by following the specified procedure. Otherwise, electrical leakage current may harm the patient and operator.

CAUTION

When connecting the cables, make sure that each instrument is turned off.

Electrode and Sensor

Attachment/Cable

Connection

WARNING

• Do not connect the Z electrode lead plug to a ground or equipotential ground. Otherwise, leakage current from another instrument cause electrical shock to the patient.

• When the JE-914A Mini Junction Box is not used, make sure that the multiple connecter cover is firmly attached to the electrode junction box. Failure to follow this warning may cause electrical shock to the patient and operator.

• Before connecting or disconnecting the DC input cable to the DC input connector, make sure that the power of the external instrument is turned off or DC signal is not output from the external instrument.

Failure to follow this warning may cause electrical shock to the patient and operator.

• Connect only the specified respiration sensor or pickup to the

AIRFLOW, CHEST and ABDOMEN connector by following the specified procedure. Otherwise, electrical leakage current may harm the patient and operator.

CAUTION

Before attaching a sensor, check whether it contains dry natural rubber or not. Natural rubber may cause allergic reaction with symptoms such as itching, redness, urticaria, swelling, fever, dyspnea, symptoms similar to asthma, reduced blood pressure and shock. If the patient shows any of the above symptoms, immediately stop using the chest movement sensor and perform appropriate medical treatment.


1. GENERAL

Operation

WARNING

• All activation testing must be applied under the supervision of the physician in charge. Mouth gags, tongue depressors and gauze sponges must always be prepared for use to prevent the patient from biting his tongue or injuring himself during testing because any pattern of flash stimuli may induce seizure activity.

When using the NE-224S Sub-dermal Straight Needle Electrode or

Intracranial Electrode

• Do not use the NE-224S sub-dermal straight needle electrode as a measurement electrode for the EEG or evoked potential measurement for any longer than one hour. When measuring the EEG or evoked potential for over one hour, use the EEG disk electrode.

• Do not check the skin-electrode impedance when using a needle electrode or intracranial electrode. Failure to follow this warning injures the patient because these electrodes will be damaged by electrolyzation inside the body.

SpO

2

Measurement

WARNING

• SpO

2

measurement may be incorrect in the following cases.

- When the carboxyhemoglobin (HbCO) or methemoglobin (metHb) increases abnormally.

- When dye is injected in the blood.

- When using an electrosurgical unit.

- During CPR

- When measuring at a site where there are venous pulses.

- When there is body movement.

- When the pulse wave is small.

- When measuring the patient with peripheral circulation

insufficiency

• When the SpO

2

probe is used on a neonate, low birth weight infant or patient with a fever or peripheral circulation insufficiency, a slight burn may result from the probe increasing the skin temperature at the attached site by 2 or 3°C (4 or 5°F). Periodically check the attached state of the probe and change the attachment site about every 8 hours.

• When performing MRI tests, remove the probes from the patient. The local heat generated from the induced electromagnetic field may burn the patient’s skin. For details, refer to the instruction manual for the

MRI.

1.8


1. GENERAL

CAUTION

• Always dry the connectors and do not let them contact liquid.

Otherwise, SpO

2

measurement result may be incorrect.

• If the attachment site is dirty with blood, clean it before attaching the probe. If there is nail polish on the attachment site, remove the polish. Otherwise, the amount of transmitted light decreases and measured data may be incorrect or measurement cannot be performed.

• When measuring SpO

2

under intense light (surgical light, bilirubin lamp, sunlight), cover the probe with a blanket or cloth. Otherwise, noise may interfere.

• Turn off the power of cellular telephones, small wireless devices and other devices which produce strong electromagnetic interference around a patient (except for PHS telephones allowed by the hospital administrator). Otherwise, radio waves from devices such as cellular telephones or small wireless devices may be mistaken as pulse waves and the displayed data may be incorrect.

Cleaning or Disinfecting

CAUTION

Turn off the power before cleaning or disinfecting. Otherwise you may get an electrical shock or the PSG input box may malfunction.

Maintenance

CAUTION

Do not disassemble the PSG input box when checking the PSG input box or performing maintenance. If there is any damage or the PSG input box is suspected to be faulty, attach an “Unusable” or “Repair request” label to the system and contact your Nihon Kohden distributor or representative.


1. GENERAL

WARNING

The programs contained in the system program installation CD-ROM are protected by copyright law and international treaties.

Unauthorized reproduction or distribution of this software, or any portion of it, may result in severe civil and criminal penalties, and will be prosecuted to the maximum extent possible under law.

NOTE

• When the PSG input box is used in a high-frequency electric field, the displayed waveform may be thicker.

• When the optional JL-951T3 SpO

2

Adapter is connected to the PSG input box and there is an extreme power surge, an “SpO

2

UNSTABLE

PULSE” message appears. To prevent noise from the AC power line, ground the electroencephalograph with a low impedance ground lead

(i.e. 1.5 m or less), connect the AC power cord to another AC outlet and/or turn off the power of surrounding equipment.

• When the system program version of the EEG-1100A/J/K/G

Electroencephalograph is 03-01, 03-02 or 03-11, the PSG input box can be connected. Upgrade the system program with the provided system disk. Refer to “Upgrading the EEG System Program” in Section 2.

1.10


1. GENERAL

Specifications

Amplifier

Number of input jacks

EEG inputs:

Extra inputs:

Bipolar inputs:

Respiration inputs:

DC inputs:

Position sensor input:

SpO

2

adaptor input:

Input impedance

Input circuit current

Internal noise level

CMRR

Gain

Low-cut filter

High-cut filter

Offset torelance

A/D conversion

Sampling and hold

Sampling frequency:

Safety

Safety standard IEC 60601-1 (1988)

IEC 60601-1 Amendment 1 (1991)

IEC 60601-1 Amendment 2 (1995)

IEC 60601-2-26 (1994)

EN 60601-1-1 (1992-06) with AMI (1995)

Type of protection against electric shock Class I (when connecting to the EEG-1100/EEG-9100/

EEG-9200 electroencephalograph)

Degree of protection against electric shock

Electrode jacks, respiration jacks, SpO

2

connector: Type BF applied part

Degree of protection against harmful ingress of water Not protected (IPX0)

Degree of safety of application in flammable gas Not suitable for use in the presence of a flammable

Mode of operation anaesthetic mixture with air or oxygen or nitrous oxide

Continuous

Electromagnetic Compatibility

6

14

14

3 {RESP F (flow), RESP C (chest), RESP A (abdomen)}

8

1

1

100 M

Ω

Less than 5 nA

Less than 1.5

µ

Vp-p (0.53 to 60 Hz)

105 dB or greater at 60 Hz (bipolar input: 60 dB or greater)

×

469.73

0.08 Hz (TC = 2 s)

120 Hz (-18 dB/oct)

±600 mV

16 bits (97 nV/LSB)

All electrodes at a time

100, 200, 500 Hz

IEC60601-1-2 (1993)

CISPR11(1990) Group1 CLASS B

Dimensions and Weight

JE-912AK:

JE-914A:

185 (W)

76 (W)

×

×

72 (D)

25 (D)

×

×

167 (H) mm, 1.0 kg

124 (H) mm, 0.2 kg (Cable length: 2.8 m)


1. GENERAL

Operation conditions

Temperature

Humidity

Atmospheric pressure

10 to 35° C (50 to 95° F)

30 to 80 % (non-condensing)

70 kPa to 106 kPa

Transport and Storage Conditions

Temperature

Humidity

Atmospheric pressure

-20 to 65° C (-4 to 149° F)

10 to 95 % (non-condensing)

70 kPa to 106 kPa

1.12


1. GENERAL

Panel Descriptions

JE-912AK PSG Input Box

WARNING


Front panel

2

3

1

Z

A1

A2

C3

C4

O1

X5

X6

X7

X8

X9

O2

X1

X2

X3

X4

ECG

X15

X10

X11

X12

PLM1

X16

X13

X14

PLM2

X17

X18

2 5 10 20 50

IMPEDANCE

CHECK

SpO

2

DC1

6

4

5

Name

1. Impedance display LED

2. 2, 5, 10, 20 50 k

Ω

SELECTOR

(Impedance preset key)

3. IMPEDANCE CHECK key

4. SpO

2

connector

5. USB cable

6. Cord hanger


1. GENERAL

Left side panel

DC 3

DC 4

DC 5

DC 6

DC 7

DC 8

DC 9

REMOTE

MARK

1

Name

1. DC input connector

2. REMOTE MARK connector

2

Bottom panel

Multiple connecter

Connects to the JE-914A Mini Junction Box. To open the multiple connecter cover, pry the cover off with a flat blade screwdriver.

CAUTION

Only connect the JE-914A Mini Junction Box. When another type of mini junction box is connected, the PSG input box will malfunction.

1.14


1. GENERAL

JE-914A Mini Junction Box

WARNING

Connect only the specified instruments to the connectors or socket, by following the specified procedure. Otherwise, electrical leakage current may harm the patient and operator.

1 5

3

4

2

Name

1. Z jack

2. Electrode jack

3. Extra input jack

4. BODY POSITION connector

5. Bipolar derivation jack

6. Respiration pickup/sensor jack

6

A1

A2

C3

C4

O1

O2

X1

X2

X3

X4

Z

BODY POSITION

DC2

ECG AIRFLOW

X15 X19

X5

X6

PLM 1

X16

X7

X8

X9

X10

PLM 2

X17

CHEST

X20

X11

X12

X13

X18

ABDOMEN

X21

X14 for JE-912A/912AK only

Attach the measurement parameter name label here

NOTE

Either of the following combinations cannot be used.

- X19 jacks and AIRFLOW connector

- X20 jacks and CHEST connector

- X21 jacks and ABDOMEN connector

If either of the above combinations is used, the signal from the X19, X20 or X21 jacks is measured.


1. GENERAL

Composition

JE-912AK

UT-0727

UT-0728

UT-0729

JE-914A

PSG INPUT board

PSG AMP board

PSG MOTHER board

Mini junction box

UT-0730 PSG JUNCTION board

1.16


Section 2 Troubleshooting and

Error Messages

How to Troubleshoot .......................................................................................................... 2.1

Closing the Program and Shutting Down Windows ....................................... 2.2

Troubleshooting ................................................................................................................. 2.3

Waveform Acquisition .............................................................................................. 2.3

Control ..................................................................................................................... 2.6

Error Messages ................................................................................................................. 2.7

Acquisition Program ................................................................................................ 2.7

SpO

2

Measurement ................................................................................................. 2.8



2C.2


2. TROUBLESHOOTING AND ERROR MESSAGES

How to Troubleshoot

Use this section to locate, identify and solve a problem in the PSG input box or an error message displayed on the screen. The troubleshooting tables in this section are divided into general problems and displayed error messages.

1.

Determine which troubleshooting table to use.

2.

In the “Problem” or “Error Message” column, find the trouble item that matches the problem or error message.

3.

Do the action recommended in the “Action” column. (Do the first action recommended in the “Action” column).

4.

If the problem or error message is not solved, do the next action recommended in the “Action” column. (If this does not solve the problem, do the next recommended sections.)

5.

If none of the actions solve the problem, contact your Nihon Kohden distributor or representative.

WARNING

When checking a cable connection, close the EEG application program, turn off the power of the electroencephalograph and all connected external instruments, and unplug the AC power cord from the AC outlet (For the procedure, refer to the next page). Failure to follow this warning may cause electrical shock.

After checking the cable connection, turn on the power of all components, then restart the PC unit.



Closing the Program and Shutting Down Windows

1.

Open the Windows Task Manager.

When the mouse does not operate:

1) Press the Ctrl + Alt + Del key. The Windows Security dialog box opens.

2) Select Task Manager to open the Windows Task Manager dialog box.

When the keyboard does not operate:

1) Right-click the task bar. The pop-up menu opens.

2) Select Task Manager to open the Windows Task Manager dialog box.

2.

Select the program to close.

3.

Select the End Task button.

4.

Shut down Windows.

1) Select Shut Down from the Start menu. Or, press the Ctrl + Esc key, then press the U key. The Shut Down Windows dialog box opens.

2) Select “Shut Down” in the “What do you want the computer to do ?” list box.

3) Select the OK button. Windows shuts down and the PC unit power is automatically turned off.

2.2



Troubleshooting

Waveform Acquisition NOTE

Before measurement, confirm the following:

• The examination room is free from artifact-causing sources.

• The electrodes are firmly attached to the patient.

• The electrodes and electrode leads are not dirty, damaged or frayed.

If not, pulse noise caused by static electricity or generated by a display may be superimposed on the EEG waveform. Refer to

“Instrument Location” in Section 2 of each electroencepahalograph operator’s manual.

Problem

Noise or artifact is superimposed on the waveforms.

Possible cause

The electrode lead is faulty.

One or more of the leads from the Z,

C3 and C4 input jacks are not attached to the patient.

The bed is not grounded.

The electroencephalograph is not grounded.

Several medical electronic instruments are used together.

There is an AC outlet or table tap near the patient or bed.

The PC unit or printer is placed near the patient or electrode junction box.

A desk lamp or fluorescent light is turned on.

Action

Check the continuity of the electrode lead with a multimeter. If the electrode lead is faulty, replace it with a new one.

Attach these leads to the patient because the Z electrode and C3 and C4 electrodes are necessary for EEG measurement.

If the bed is metal, ground it.

If the AC outlet on the wall does not have a ground terminal, ground the electroencephalograph with the provided ground lead.

Perform equipotential grounding for each instrument.

Arrange the measurement environment so that there is no influence from an AC power line.

Arrange the measurement environment so that unwanted radio frequency does not affect the measurement.

Turn the desk lamp or fluorescent light off.

The patient touched some metal part.

There is a cellular phone near the patient.

Prevent the patient from touching metal parts.

The patient is using an electric blanket.

Turn the electric blanket off and unplug the AC power cord, then use another warming method.

Turn the cellular phone off.



Problem

The waveform is not stable.

The waveform sometimes becomes flat.

During waveform acquisition the following message appears.

“The disk is full. Close the current file to exit the acquisition program. Insert a new disk.

[CAUTION]

Do not turn off the power of the main unit or connected instruments (Photo

Drive unit or MO drive).

This can cause loss of EEG data and damage to the hard disk.”

The waveform is not displayed.

The AC filter does not function.

Noise in AV derivation.

The electrode name on the screen is indicated in red.

Possible cause

One or more of the leads from the Z,

C3 and C4 input jacks are not attached to the patient.

New and old electrodes or different types of electrodes are used together.

The skin electrode contact impedance of the C3 or C4 is high.

The storage drive (the MO disk or hard disk which saves the EEG data file) is almost full.

The color of the waveform and background is the same.

The Display setting in the Pattern table is set to "Off".

The AC filter setting is not correct.

Noise is not caused by AC line influence.

An unused electrode for AV derivation is selected in the AV Delete dialog box.

The electrode that is used for measurement is not selected for the storage electrode.

Action

Attach these leads to the patient because the Z electrode and C3 and C4 electrodes are necessary for EEG measurement.

Do not use new and old electrodes or different types of electrodes together.

This may cause high polarization voltage.

Clean the electrode attachment to reduce the impedance, and reattach the electrode.

Click the OK button on the message dialog box, then end the measurement and save the file. Refer to "Starting and

Ending EEG Measurement - Ending the

Measurement and Saving the File" in

Section 5 of the EEG Operator’s manual. After saving the file, prepare a new MO disk, or delete unnecessary files in the hard disk.

Use a different color for waveform and background.

Set the Display setting to "On" for necessary channels.

Select the correct AC filter setting (50 or 60 Hz) in the System program.

Use the proper filter according to the artifact.

Delete unnecessary electrodes for AV derivation in the AV Delete dialog box.

Select the electrode for the storage electrode in the Electrodes to be Saved dialog box of the System program.

The amplifier setting (sensitivity, time constant or high-cut filter) does not change with the Amp bar.

The Acquisition program does not open.

The electrode is selected for the AV derivation but not selected for the storage electrode.

The amplifier setting is not set to

"ACC".

---

Faulty USB cable connection.

Faulty PSG input box.

Select all electrodes which are selected for the AV derivation for the storage electrode in the Electrodes to be Saved dialog box of the System program.

Set the amplifier setting to ACC with the pattern table in the System program. You can temporarily change the amplifier setting in the Acquisition program and Review program.

When an error appears, follow the instructions on the dialog box.

Turn off the power of the PC unit, then check that the USB cable from the PSG input box is correctly connected to the

PC unit.

Replace the PSG input box.

2.4



Problem

No calibration waveform appears on the screen.

Artifact is superimposed on all calibration waveforms.

Only baselines appear on the screen.

No waveform appears on the screen.

Artifact is superimposed on all signals input from the electrode jacks.

Possible cause

Faulty PSG MOTHER board.

A specific electrode signal does not appear.

Artifact is superimposed on a specific electrode signal.

Action

Replace the PSG MOTHER board or

PSG input box.

Faulty PSG MOTHER board if no

SELECTOR (Impedance threshold display) LED on the PSG input box lights.

Faulty PSG INPUT board.

Faulty PSG AMP board.

Faulty electrode lead.

Faulty PSG INPUT board.

Faulty PSG AMP board. An amplifier corresponding to the signal is faulty.

Faulty electrode lead.

Replace the PSG MOTHER board or

PSG input box.

Replace the PSG INPUT board.

Replace the PSG AMP board.

Replace the electrode lead.

Replace the PSG INPUT board.

Replace the PSG AMP board or PSG input box.

Replace the electrode lead.

Faulty electrode jack on the mini junction box.

Faulty PSG INPUT board. An amplifier corresponding to the signal is faulty.


Faulty PSG AMP board.

Replace the PSG JUNCTION board or mini junction box.

Replace the PSG INPUT board or PSG input box.



No DC input signal appears on the screen.

Artifact is superimposed on all DC input signals.

A specific DC input signal does not appear on the screen.

Artifact is superimposed on a specific

DC input signal.

SpO

2

data is not displayed.


Replace the PSG AMP board.

The respiration waveform input to the

AIRFLOW, CHEST or ABDOMEN connectors is not displayed.

The signal input to any of the X15 to

X21 bipolar derivation jack

The “On/Off” setting of the “DC01” channel (SpO

2

channel) in the DC

Input Conversion Display Setting dialog box is set to “Off” (Pattern table

→

DC Conversion button).

A respiration pickup is connected to the corresponding X19 to X21 jack.

Set the “On/Off” setting to “On”.

(DC Input Conversion Display Setting dialog box

→

Set a Channel dialog box

→

On/Off area).

Remove the respiration pickup from the corresponding jack*.

The reference electrode (G2) is not set to “ 0 V”.

Set the reference electrode to “0 V”.


NOTE

• Either of the following combinations cannot be used.

- X19 jacks and AIRFLOW connector

- X20 jacks and CHEST connector

- X21 jacks and ABDOMEN connector

If either of the above combinations is used, the signal from the

X19, X20 or X21 jacks is measured.

• When the PSG input box is used in a high-frequency electric field, the displayed waveform may be thicker.

2.5


Control

does not start.

Problem

When the power is turned on, Windows

Possible cause


Problem with the Windows operating system.

Action

1. Turn the power of the PC unit off.

2. Remove the USB cable from the PC unit.

3. Restart the PC unit.

If Windows starts correctly, the PSG input box is faulty. Replace the PSG input box.

Reinstall the Windows operating system and EEG system program.

Refer to the service manual of each electroencephalograph.

Replace the PC unit.

Close the screen saver program.

The EEG application program does not work correctly.

Faulty PC unit.

A screen saver program is active.

Another windows application program is active.

The two PSG input box are used and the ID number of the second PSG input box is not set to “2”.

The USB cable from the PSG input box is not connected to the PC unit.


Close all Windows application programs. Or, delete the application program if it conflicts with the EEG system program.

Set the ID number of the second PSG input box to “2” . Refer to “PSG

Mother Board” in Section 3.

Turn off the power of the PC unit, then connect the USB cable to the PC unit correctly.

Replace the PSG input box if an error message for the PSG input box appears.

Reinstall the EEG system program.

Problem with the EEG application program.

Faulty PC unit.

Replace the PC unit.

2.6



Error Messages

Following is a list of error messages during operation or the power on self check for the PC unit. To solve the problem if an error message appears, find the displayed error message from the table, then do the action recommended in the

Action column.

Acquisition Program

Error Message

The IMPEDANCE CHECK key on the

PSG input box has been pressed.

The SELECTOR key on the PSG input box was pressed during startup.

<< USB 901 >> The electrode junction box has been disconnected.

The Acquisition program will be closed after saving the acquired data.

Please connect the electrode junction box, and restart the program.

<< USB 902 >> No electrode junction box was detected.

Confirm the electrode junction box is connected and restart the Acquisition program.

<< USB 903 >> The electrode junction box is disconnected or there is a data transmission error.

After the Acquisition program closes, turn off the power, confirm the electrode junction box is connected and restart the Acquisition.

<< USB 904 >> An overflow occurred during data transmission from the electrode junction box.

Restart the Acquisition program

The input boxes have save ID.

Disconnect one input box or set different ID’s for each input box.

Possible Cause

When the power is turned on, the

IMPEDANCE CHECK key on the PSG input box is pressed, or the

IMPEDANCE CHECK key makes a short-circuit.

The connection between the PSG

INPUT board and PSG MOTHER board is disconnected.

When the power is turned on, the

SELECTOR key on the PSG input box is pressed, or the SELECTOR key makes a short-circuit.

The connection between the PSG

INPUT board and PSG MOTHER board is disconnected.

Faulty USB cable connection.

The PSG input box is not recognized.

Faulty data communication between the

PSG input box and PC unit.

Overflow occurs during data transfer.

The two PSG input box are used and the ID number of the second PSG input box is not set to “2”.

Action

Do not press the IMPEDANCE

CHECK key when the power is turned on. If the IMPEDANCE CHECK key is faulty, replace the PSG INPUT board.

Check the cable connection. If the flat cable is faulty, replace it with a new one.

Do not press the SELECTOR key when the power is turned on. If the

SELECTOR key is faulty, replace the

PSG INPUT board.

Check the cable connection. If the flat cable is faulty, replace it with a new one.

Check that the USB cable from the

PSG input box is correctly connected to the PC unit, then open the Acquisition program.

Check that the USB cable from the

PSG input box is correctly connected to the PC unit, then open the Acquisition program. If the same error message appears again, reinstall the PSG input box driver, or replace the PSG input box.

1. Close the Acquisition program.

2. Turn the PC unit off.

3. Check that the USB cable is correctly connected to the PC unit.


5. Open the Acquisition program.

1. Close the Acquisition program.

2. Turn the PC unit off.

3. Check that the USB cable is correctly connected to the PC unit.


5. Open the Acquisition program.

Set the ID number of the second PSG input box to “2”. Refer to “PSG Mother

Board” in Section 3.



SpO2 Measurement

Error Message

SpO

2

UNSTABLE PULSE

SpO

2

CONNECTOR OFF

SpO

2

CHECK PROBE

SpO

2

WEAK PULSE

SpO

2

PULSE SEARCH

SpO

2

NO PULSE

SpO

2

CHECK PROBE SITE

SpO

2

LIGHT INTERFERE

SpO

2

PROBE FAILURE

SpO

2 hardware failure

The SpO

2 error message is displayed on SpO

2

channel of the extended channel bar and event bar. Solve the problem referring the following table. When the

SpO

2

error message is displayed, the SpO

2

value becomes 0 V.

Possible Causes

Patient body movement.

Probe attachment is unstable.

SpO

2

adaptor is disconnected from the

PSG input box

Faulty SpO

2

adaptor

Probe is detached from the patient.

Probe is disconnected from the SpO

2 adaptor.

Poor peripheral circulation

Action

Check the patient condition. Remove the cause by changing the attachment site, etc.

Firmly attach the probe to the patient.

Firmly connect the SpO

2

adaptor to the

PSG input box.

Replace the SpO

2

adaptor.

Check the probe attachment condition.

Firmly connect the probe to the SpO

2

.


Reattach the probe.

Probe is attached too tight and prevents circulation.

Searching for correct pulse waveform Wait until the pulse waveform is detected.


Pulse waveform is rough and SpO

2 cannot be measured.


Poor peripheral circulation

Reattach the probe.



Probe is attached too tight and prevents circulation.


Reattach the probe.

Probe attachment site is inappropriate.

Refer to the probe operator’s manual and attach the probe on the appropriate

Probe is past the expiration date.

The measurement site is under surgical site.

Replace the probe with a new one.

Cover the probe with a blanket or cloth.

light, bilirubin light, sunlight, etc.

The AC filter setting is not correct Check the AC filter setting in the

System Program.

Faulty probe.

Faulty SpO

2

adaptor

Replace the probe with a new one.

Replace the SpO

2

adaptor.

2.8

NOTE

When the optional JL-951T3 SpO

2

Adapter is connected to the PSG input box and there is an extreme power surge, an “SpO

2

UNSTABLE PULSE” message appears. To prevent noise from the AC power line, ground the electroencephalograph with a low impedance ground lead (i.e. 1.5 m or less), connect the AC power cord to another AC outlet and/or turn off the power of surrounding equipment.


Section 3 Board Description

General .............................................................................................................................. 3.1

Block Diagram ......................................................................................................... 3.1

PSG INPUT Board and PSG AMP Board .......................................................................... 3.2

PSG MOTHER Board ........................................................................................................ 3.6

Settings When Using Two PSG Input Boxes ...................................................................... 3.8



3C.2


3. BOARD DESCRIPTION

General

Block Diagram

JE-914A Mini Junction Box

PSG JUNCTION board

PSG INPUT board

JE-912AK PSG Input Box

PSG AMP board

S/H

A/D converter

PSG MOTHER board

J-BOX controller

USB controller

SH-Card

To EEG

SpO

2

probe

DC input (8 channel)

The PSG input box consists of the PSG INPUT board, PSG AMP board and PSG

MOTHER board. The JE-912AK PSG input box has 4 dual DC input connectors (8 channels). The general functions of the PSG input box are to:

• amplify the polysomnogram signals picked up from the electrodes, sensors SpO

2 probe

• amplify the DC input signals from the DC input connectors.

• simultaneously sample the amplified signals at the frequency of 1 kHz,

• convert the sampled analog signals to digital serial data,

• output the digital data to the PC unit by USB communication

• measure the skin-electrode contact impedance and display the skin-electrode contact impedance with the LEDs



PSG INPUT Board and PSG AMP Board

120 Hz -18 dB/oct 70 Hz -18 dB/oct

120 Hz -18 dB/oct

120 Hz -18 dB/oct 120 Hz -18 dB/oct 120 Hz -18 dB/oct

3.2


PSG INPUT board



Electrode potential signals from the JE-914A Mini Junction Box are processed as follows. The top of each EEG amplifier circuit and respiration pickup/ bipolar deviation circuit has an input protection circuit to limit the input voltage within

±

9 V.

EEG Primary Amplifier Circuits

• 2 second time constant circuit

Provides a 2 second time constant.

• Primary operational amplifier (

×

8)

Amplifies the difference between the two input signals 8 times.

System Reference Voltage Generation Circuit

Averages the electrode potential between C3 and C4 and amplifies 1.14

times. This voltage is used for the system reference voltage for waveform acquisition.

Z Signal Generation Circuit

Averages the electrode potential between C3 and C4. This voltage is fed back to the Z electrode to reduce artifact.

Bipolar Derivation Primary Amplifier Circuit:

Primary operational amplifier

Amplifies the difference between pair of input signals for bipolar derivation 8 times.

Respiration Pickup Circuit/Airflow Sensor Input Circuit

• Primary operational amplifier

Respiration pick up circuit:

Amplifies the difference between pair of input signals for bipolar derivation 8 times.

Airflow sensor input circuit:

Buffers the signal from airflow sensor



• Reset circuit

Resets the trace to the baseline.

• Secondary operational amplifier (

×

117)

Amplifies the signals 117 times.

• Anti-aliasing circuit (120 Hz, -18dB/Oct)

Filters any aliasing signal.

3.3


PSG AMP board

3.4

Body Position Sensor Input Circuit

• Buffer amplifier

Provides 1.5 M

Ω

input impedance.

• Reset circuit


• Attenuator

Attenuates the signals 1/4.



EEG Secondary Amplifier Circuit/Bipolar Deviation Secondary

Amplifier Circuit



• Reset circuit


• Secondary operational amplifier (

×

117)

Amplifies the signals 117 times.



Sample and Hold Circuit

Samples and holds signals at 1 kHz sampling frequency.

Impedance Check Indicator

• Impedance check LEDs

Shows the result of the electrode impedance check.

• Impedance threshold LEDs

Shows the skin-contact impedance check threshold.

DC Input Circuit

• Buffer amplifier

Provides 1.5 M

Ω

input impedance

• Reset circuit


• Anti-aliasing circuit (70, 120 Hz, -18dB/Oct)




• Sample and hold circuit (1 kHz)

Samples and holds signals at 1 kHz sampling frequency.

Multiplexing Circuit

Multiplexes the data from the sample and hold circuit and outputs it as serial data.



PSG MOTHER Board

3.6




This board consists of the following components:

PSG Input Box Control Circuit

• Controls the overall operation of the PSG input box at 100 MHz clock frequency using a SH7709A CPU (U091 CARD-E09A). The EPROM (256 kB

×

16 bit) contains the program to control the PSG input box operation.

• Simultaneously controls the reset circuits of all the amplifiers in the PSG input box.

• Controls the impedance check function. The skin-electrode contact impedance is calculated and the check result is displayed on the LEDs on the

PSG INPUT board and sent to the PC unit.

Power Supply Circuit

On the non-floating circuit

+5 V: Power supply from the PC unit

+3.3V: Power supply for digital circuits

+1.8 V: Power supply for CARD-E09A

On the floating circuit

The following powers are generated by the DC-DC converter.

+5 VF: Power supply for floating circuits.

Isolation Circuits

The photocouplers are used for transferring the digital data from the floating circuit to the non-floating circuit.

A/D Conversion Control Circuit/ Impedance Check Control Circuit

• A/D conversion control circuit

Convert the analog EEG signals, sensor signals and DC input signals into digital signals. First, the analog signal is sampled and held. Second, the sampled and held data is multiplexed. Third, the multiplexed data is converted into digital EEG signals with a 16 bit A/D converter.

• Impedance check control circuit

The impedance check current is generated by an 8 bit D/A converter.

USB Communication Control Circuit

Controls the communication between the PSG input box and PC unit.

J012 Jumper Switch

This switch sets the ID number of the PSG input box.

Short: 1 (default setting)

Open: 2

3.7


Settings When Using Two PSG Input Boxs

You can measure the polysomnogram for two patients simultaneously by using two PSG input boxs. To use two PSG input boxes, do the following.

1.

Set the ID number to “2” for the second PSG input box.

The ID number can be set by the J012 jumper switch on the PSG MOTHER board in the PSG input box. The default setting is “1”. To change the setting, refer to the service manual. When the power of the electroencephalograph is turned on, the 10 k

Ω

or 20 k

Ω

impedance display

LED lights to indicate the ID number.

ID 1: 10 k

Ω

ID 2: 20 k

Ω

2.

Create the shortcut icons for the first and second PSG input boxes. Refer to

“Settings When Using Two PSG Input Boxs” in Section 2 of the Operator’s manual.

3.8


Section 4 Disassembly

Before You Begin ............................................................................................................... 4.1

Warnings, Cautions and Notes ................................................................................ 4.1

Required Tools ......................................................................................................... 4.1

Disassembly ...................................................................................................................... 4.2



4C.2


4. DISASSEMBLY

The procedures in this section tell how to remove, replace and install major components in the PSG input box.

• To remove the connection cables, refer to “Cable Connections” in Section 2 of

the Operator’s manual.

Before You Begin

Warnings, Cautions and

Notes

Removing, replacing and installing major components should be done only by qualified service personnel.

WARNING

• To avoid the possibility of injury to yourself or damage to the PSG input box, do not install or remove any component or change switch settings while the power is on.

• To avoid accidental discharge of static electricity which could damage the components of the PSG input box, use a grounded wrist strap when installing or removing any component of the PSG input box.

• Before connecting or disconnecting a cable, close the EEG application program, shut down Windows, turn off all components and unplug the AC power cord from the AC outlet.

Required Tools

CAUTIONS

• Removal and replacement of any components in the PSG input box should only be done by qualified service personnel.

• Use only parts recommended by Nihon Kohden to assure maximum performance from your PSG input box.

• Anti-static bench mat

• Wrist ground strap

• Phillips screwdriver (insulated type, for M3 and M4 screws)

• Hex socket driver (for 8 mm floating bolt, 5.5 mm spacer bolt and nut)

• Tweezers


4. DISASSEMBLY

Disassembly

1.

Turn the PSG input box front side down.

2.

Remove the four M4 binding head screws which fasten the rear cover to the front cover.

inside the shield sheet (OUT)

3.

Remove the rear cover.

4.

Remove the five 8 mm floating bolts which fasten the PCB unit to the front cover.

4.2

PCB unit inside the shield sheet (OUT)


4. DISASSEMBLY

5.

Remove the PCB unit from the front cover.

6.

Remove the five M3 screws with spring washers and open the shield sheet

(OUT).

PSG MOTHER board

7.

Remove the flat cable and USB cable which are connected to the PSG

MOTHER board.


USB cable

Flat cable

4.3

4. DISASSEMBLY

PSG INPU board

PSG AMP board

Shield sheet (IN)

PSG MOTHER board

The boards are connected with 5.5 mm spacer bolts and 5.5 mm spacer nuts.

Spacer bolt Spacer nut

4.4


Section 5 Maintenance

Checking the PSG Input Box .............................................................................................. 5.1

Checking Noise ......................................................................................................... 5.1

Checking the Skin-electrode Impedance Check Function ......................................... 5.2

Checking the EEG Input Circuit ................................................................................ 5.3

Checking the Amplifier .................................................................................... 5.3

Checking the Input Signal for Each Channel ................................................... 5.4



5C.2


5. MAINTENANCE

Checking the PSG Input Box

Checking Noise

Use the EEG noise checker to check the internal noise of the PSG input box. This checker shorts circuits all EEG inputs as shown in the circuit diagram. Assemble the EEG noise checker locally with parts that are purchased locally or from your

Nihon Kohden distributor or representative.

Circuit diagram

1

16

17

24

25

Not used

26

27

Not used 28

Not used 29

30

33

Not used 34

Not used

35

Not used

36

37

Not used

42

43

44

50

To PSG input box Noise checker


1.

Connect the EEG noise checker to the multiple connector of the PSG input box.

2.

Start the Acquisition program.

3.

Set the EEG instrument to the following settings.

High-cut filter:

Time constant:

Sensitivity:

AC filter:

60 Hz

0.3 s

1

µ

V/mm

Off

Montage: Any montage except E lead connection pattern.

4.

Check that the amplitude of the noise on the screen is less than 1.5 mVp-p.

Required Parts

Description

Connector PCR-S50FS

Housing PCR-LS50LA

Qty

1

1

Code No.

545287

545394

5.1

Circuit diagram

1

16

17

24

25

Not used

26

27

Not used

28

Not used

29

30

33

Not used

34

Not used 35

Not used

36

37

Not used

42

43

44

50

To PSG input box

5.2

5. MAINTENANCE

Checking the Skinelectrode Impedance

Check Function

Use the EEG impedance checker to check the skin-electrode impedance check function. This checker shorts circuits all EEG inputs as shown in the circuit diagram. Assemble the EEG impedance checker locally with parts bought locally or from your Nihon Kohden distributor or representative.

We recommend assembling the five different checkers to perform the impedance check for the five different resistance values.

Resistor

Checker 1 Checker 2 Checker 3 Checker 4 Checker 5

2.0 k

Ω

F 4.99 k

Ω

F 10.0 k

Ω

F 20.0 k

Ω

F 49.9 k

Ω

F

1.

Connect the EEG impedance checker to the multiple connector of the PSG input box.

2.


3.

Do the skin-electrode impedance check with the 5 different checkers. Refer to

“Checking the Skin-electrode Impedance” in Section 5 of the EEG operator’s manual.

Required Parts

Description

Resistor MRS25F2001 2.0 k

Ω

F


Ω

F


Ω

F


Ω

F


Ω

F

Connector PCR-S50FS

Housing PCR-LS50LA

Qty

35

35

35

35

35

1

1

Code No.

227051

227434

227728

228014

228398

545287

545394

Impedance checker


Checking the EEG Input

Circuit

5. MAINTENANCE

Checking the Amplifier

Use the EEG input checker to check amplifiers for each electrode on the EEG input circuits on the PSG input box. This checker divides the applied signals to 1/

10000. (Example: 500 mV to 50

µ

V). Assemble the EEG input checker locally with parts that are purchased locally or from your Nihon Kohden distributor or representative.

1.

Connect the EEG input checker to the multiple connector of the PSG input box.

2.


Circuit diagram

100

Ω

1

4

5

6

7

Not used

Not used

Not used

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Not used

Not used

Not used

33

34

35

36

37

38

39

40

41

42

43

44

Not used

49

50

To PSG input box

1 M

Ω

Input checker


3.


High-cut filter: 120 Hz

Time constant:

Sensitivity:

AC filter:

Montage:

0.3 s

10

Off

µ

V/mm

(G-)

Any electrode

(G+)

0 V

Ground (reference)

500 mV

4.

Apply 500 mV sine waves between pin 50 (500 mV) and 1 (ground).

5.

With the Voltage cursor, check that the amplitude of each channel is 50 uV/mm.

(The amplitude of C3-0V, C4-0V is 0 V: flat)

Required Parts

Description

Connector PCR-S50FS

Housing PCR-LS50LA

Resistor SN14C2CT26 1.00M

Ω

Resistor SN14C2CT26 100

Ω

Qty

1

1

1

1

Code No.

545287

545394

070086

066242

5.3

5. MAINTENANCE

Checking the Input Signal for Each Channel

You can check that applied input signals are correctly processed for each channel with the JE-0005 EEG Pattern Checker and YZ-0243 JE-912A/AK Connection

Cable.

1.

Connect the EEG pattern checker to the multiple connector of the PSG input box with the JE-912AK connection cable (Code No.: 545634).

2.


3.


High-cut filter: Off

Time constant:

Sensitivity:

AC filter:

Reference:

1 or 0.3 s

10

Off

Off

µ

V/mm

Sweep speed:

Montage setting:

10 s/page

Set as shown left

4.

Turn on the power of the EEG pattern checker and press the START button.

EEG pattern checker

ON/OFF switch

5.

Check the montage setting on the screen.

START button

5.4


5. MAINTENANCE

The relationship between clock signal and electrode is as follows

Clock Signal No.

Electrode

1

A1

2

A2

3

C3

4

C4

5

O1

6

O2

7

X1

8

X2

9

X3

10

X4


11

Electrode

X5

12

X6

13

X7

14

X8

15

X9

16 17 18 19 20

X10 X11 X12 X13 X14


21

Electrode

X15

22

X16

23

X17

24

X18

25

X19

26

X20

27

X21

The negative or positive pulse signal appears according to the montage setting for each channel. The montage of the following example is G1 (+): C3 and G2 (-): O2.

1 5

O2

10 15 20 25 30

C3

When the G2 (-) electrode is set to “0 V”, only the negative pulse according to the selected electrode appears for the channel.


5. MAINTENANCE


5.6


Section 6 Replaceable Parts List

JE-912AK PSG Input Boxt ................................................................................................. 6.2

JE-914A Mini Junction Box ................................................................................................ 6.4



6C.2


6. REPLACEABLE PARTS LIST

When ordering parts or accessories from your nearest Nihon Kohden Corporation distributor, please quote the NK code number and part name which are listed in this service manual, and the name or model of the unit in which the required part is located. This will help us to promptly attend to your needs. Always use Nihon

Kohden parts and accessories to assure maximum performance from your instrument.



JE-912AK PSG Input Box

A

B

C d

Index Code No.

Q’ty Description

7

8

5

6

3

4

1

2

6112-015677

6112-014286B

6132-013266B

6112-015499

6112-014259A

6114-056263A

6124-032421B

6114-11809B

1

1

1

5

1

1

1

1

Front cover

Rear cover

Front panel for JE-912AK

Shiled sheet (OUT)

Shiled sheet (IN)

Floating bolt

USB cable holder

Connector cover

9

10

11

12

6114-117447

6124-000668C

6114-000668C

127997

1

8

1

1

Sponge

DC INPUT panel

Holder attachment

Spacer bolt (L9)

13 292015 4 Spacer nut (L12)

14 6114-121585 1 LED spacer

15

16

596712

128069

3

1

Spacer (L7)

Spacer nut (L9)

UT-0727

UT-0728

UT-0729

531079

1

1

1

1

PSG INPUT board

PSG AMP board for

PSG MOTHER board

JE912AK USB cable

6.2


3

1


4

10

13

15

6

14

9

C

6

B

16

7

2

A

5

8 12

11

D



JE-914 Mini Junction Box

4

5

2

3

Index NK Code No.

1 6112-005072B

6143-01177

6113-041094A

6114-005612

273482

Qty

1

1

1

35

4

Description

Front panel

Rear cover assy

Strap

Electrode jack

Sensor jack

A UT-0730 1 PSG JUNCTION board

6.4


Section 7 Connector Pin

Assignment

Input/Output Connector/Jack Pin Assignment .................................................................... 7.1

PSG Input Box .......................................................................................................... 7.1

SpO

2

Connector .............................................................................................. 7.1

DC Input Connector ......................................................................................... 7.1

REMOTE MARK Connector ............................................................................ 7.1



7C.2


7. CONNECTOR PIN ASSOGNMENT

Input/Output Connector/Jack Pin Assignment

WARNING


PSG Input Box

4

7 5

3

SpO

2

Connector

2 1

Unit side: TCS7678-01-201

Cable side: MP-371/7

PIn No.

1

2

5

6

3

4

7

Signal

DGND

Not used

+5 V OUT

RxD

TxD

Not used

CON CHK

Unit side:

1

3

2

DC Input Connector

Max, ±3 V, input impedance 1.5M

Ω

PIn No.

1

HSJ1462-01-010 (Code No.: 608389)

Cable side: 2.5

ϕ

miniature jack, KP-2S (Code No: 608406)

2

3

Signal

DGND

DC INPUT

(channel 3, 5, 7, 9)

DC INPUT

(channel 4, 6, 8, 10)

Unit side:

4

5

1

7

6

2

3

REMOTE MARK Connector

HSJ2000-01-010 (Code No.: 501503)

Cable side: 3.5

ϕ

miniature jack (Code No: 606907)

PIn No.

1

2

3

4 to 7

Signal

Not used

MARK INPUT

DGND

Not used

Operator's Manual JE-912AK 7.1

5. CONNECTOR PIN ASSOGNMENT

Multiple Connector

WARNING

When the JE-914A Mini Junction Box is not used, make sure that the multiple connector cover in firmly attached to the PSG input box.

Failure to follow this warning may cause electrical shock to the patient and operator.

1 26

25

50

Unit side: PCR-E50LMD-SLB1

(Code No.: 513713)

Cable side: Connector - PCR-S50FS

(Code No.: 545287)

Housing- PCR-LS50LA

(Code No.: 545394)

7.2

CAUTION

Only connect the JE-914A Mini Junction Box. When another type of mini junction box is connected, the PSG input box malfunction.

A2

X11

X12

X13

X10

O1

O2

A1

C3

C4

X9

X5

X6

X7

X8

Signal

X14

X15 + (ECG)

X15 – (ECG)

X16 + (PLM1)

X16 – (PLM1)

X17 + (PLM2)

X17 – (PLM2)

X18 +

X18 –

AGND

12

13

14

15

10

11

8

9

PIn No.

1

2

5

6

3

4

7

20

21

22

23

16

17

18

19

24

25

37

38

39

40

33

34

35

36

Pin No.

26

27

28

29

30

31

32

45

46

47

48

41

42

43

44

49

50

Not used

Not used

Operator's Manual JE-912AK

Signal

DC2 (BODY)

MINI-DTC

Not used

X19

X1

X2

X3

X4

X20

X21

Not used

X19 + (FLW)

X19 – (FLW)

X20 + (CHT)

X20 – (CHT)

X21 – (ABD)

X21 – ( ABD)

Z

X19_SEL

X20_SEL

X21_SEL

Not used

Not used

Nihon Kohden JE-912AK PSG Input Box Service manual

Assistant Bot

PSG INPUT BOX

Contents

GENERAL HANDLING PRECAUTIONS

This device is intended for use only by qualified medical personnel.

Please read these precautions thoroughly before attempting to operate the instrument.

1.

To safely and effectively use the instrument, its operation must be fully understood.

2.

When installing or storing the instrument, take the following precautions:

3.

Before Operation

4.

During Operation

5.

To Shutdown After Use

6.

The instrument must receive expert, professional attention for maintenance and repairs. When the instrument is not functioning properly, it should be clearly marked to avoid operation while it is out of order.

7.

The instrument must not be altered or modified in any way.

8.

Maintenance and Inspection:

9.

When the instrument is used with an electrosurgical instrument, pay careful attention to the application and/or location of electrodes and/or transducers to avoid possible burn to the patient.

10. When the instrument is used with a defibrillator, make sure that the instrument is protected against defibrillator discharge. If not, remove patient cables and/or transducers from the instrument to avoid possible damage.

WARRANTY POLICY

CAUTION

EMC RELATED CAUTION

Conventions Used in this Manual and Instrument

Warnings, Cautions and Notes

CAUTION

NOTE

Explanations of the Symbols in this Manual and Instrument

Precautions for Input Jack Use

NOTE

NOTE

NOTE

NOTE

Section 1 General

Introduction

CAUTION

Trademarks

Service Policy, Service Parts and Patient Safety Checks

Service Policy

Service Parts

NOTE

Patient Safety Checks

Maintenance Equipment/

Tools

General Information on Servicing

CAUTION

General Safety information

WARNING

Installation

WARNING

CAUTION

Electrode and Sensor

Attachment/Cable

Connection

WARNING

CAUTION

Operation

WARNING

SpO

Measurement

WARNING

CAUTION

Cleaning or Disinfecting

CAUTION

Maintenance

CAUTION

WARNING

NOTE

Specifications

Panel Descriptions

JE-912AK PSG Input Box

WARNING

Name

CAUTION