Okidata ML 380 Dot Matrix Printer Service Guide
Below you will find brief information for Dot Matrix Printer ML 380. The ML 380 is an 80 column, impact dot matrix printer using a 24-pin printhead. It emulates the Epson LQ printer. A push tractor is standard. An optional pull tractor is available. Font and Character Pitch selection is available through the operator panel, printer menu, or through software. The printer has a Centronics Parallel interface and has an optional RS232-C interface module available.
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Service Guide ML380
Chapter 0 About This Manual
Page: 1
ML380
Dot Matrix Printer
Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual.
09/17/97
Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures rendered at 300 dpi, which is ideal for printing, but does not view on most displays well.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Table of Contents
Service Guide ML380
0 About This Manual
Front Cover
Manual Copyright
1 Product Specifications
1.1 Overview
1.2 Physical Specifications
1.3 Power Requirements
1.4 Environmental Conditions
1.5 Agency Approvals
1.6 Operational Specifications
1.7 Paper Specifications
1.8 Memory Specifications
1.9 Consumables
1.10 Options
1.11 Reliability
2 Principles of Operation
2.1 Principles of Operation - General Information
....2.1.02 Microprocessor and Peripheral Circuits
....2.1.03 Initialization
....2.1.04 Interface Control
....2.1.05 Printhead Drive Circuit
....2.1.06 Spacing Drive Circuit
....2.1.07 Line Feed Circuit
....2.1.08 Alarm Circuits
....2.1.09 Paper End Detection Circuit
....2.1.10 Power Supply
2.2 Mechanical Operation - Printhead Mechanism
....2.2.02 Spacing
....2.2.03 Ribbon Drive
....2.2.04 Paper Feed
....2.2.05 Paper-End Detection
....2.2.06 Semi-Automatic Sheet Feeder (SASF)
....2.2.07 Paper Park
3 Maintenance & Disassembly
3.1 Maintenance - General Information
....3.1.02 Maintenance Tools
....3.1.03 Maintenance Precautions
3.2 Disassembly/Assembly Procedures - General Information
....3.2.01 Paper Separator
....3.2.02 Printhead
....3.2.03 Upper Cover Assembly
....3.2.04 Space Rack
Page
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Table of Contents
....3.2.05 Ribbon Feed Gear Assembly
....3.2.06 Mini-Pitch (Space) Belt
....3.2.07 Head Connector Assembly
....3.2.08 Main Control Board (UMMB)
....3.2.09 Operation Panel
....3.2.10 Line Feed Motor
....3.2.11 Photosensor Assembly (Paper End)
....3.2.12 Bail Arms
....3.2.13 Carriage Frame
....3.2.14 Platen Assembly
....3.2.15 Pressure Roller Assembly
....3.2.16 Paper Pressure Guide
....3.2.17 Tractor Assembly
....3.2.18 Microswitch Assembly (SASF)
....3.2.19 Microswitch Assembly (Home Position Switch)
....3.2.20 Printer Mechanism
....3.2.21 Power Supply Unit
....3.2.22 Space Motor Assembly
....3.2.23 Bottom Paper Guide Lever
3.3 Printer Adjustments
....3.3.02 Gap Between Platen and Printhead
....3.3.03 Space Belt Tension
....3.3.04 Key Combinations
....3.3.05 Menu Operation / Menu Select Mode - General
Information
........From Print Mode
........From Power-OFF
........Printing the Menu
........Sample Menu
........Reset Menu to Factory Defaults
........Limited Operation
........Menu Settings
....3.3.06 Top of Form
....3.3.07 Paper Park
....3.3.08 Paper Tear Off
....3.3.09 Resets
3.4 Cleaning
3.5 Lubrication
3.6 Shipping Instructions
4 Failure & Repair Analysis
4.1 Failure & Repair Analysis - Introduction
....4.1.02 Printer Serial Number Identification
....4.1.03 Firmware Revision Identification
4.2 Reporting Problems - General Information
72
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Table of Contents Page
....4.2.02 Problem Lists
....4.2.03 Reporting Methods
4.3 Troubleshooting Updates General Information
4.4 Troubleshooting Tips
....4.4.02 Problem Categories
....4.4.03 START HERE Flowchart
....4.4.04 Tips for Preventing Image Problems
....4.4.05 Common Problems
4.5 Abnormal Output
4.6 Fault Alarms - General Information
....4.6.02 Fault Alarm Lamp Display
4.7 Repair Analysis Procedures (RAPS) - Using The RAPS
....4.7.02 RAP Index
........RAP 01: No Power
........RAP 02: Space Operation Does Not Operate Normally
........RAP 03: Wrong Character or Missing Dots
........RAP 04: Line Feed Trouble
........RAP 05: Data Receiving Failure
4.8 Printer Tests - General Information
....4.8.02 Rolling ASCII Test
96
97
98
99
100
....4.8.03 Font Test 101
....4.8.04 Serial Interface Loopback Test - General Information 102
........Loopback Connector Configuration Diagram
........Procedure
103
104
........Serial Cable Information
........Serial Interface Signal Requirements
........Commonly Used Serial Cable Configurations
....4.8.05 Hexadecimal Dump Mode
4.9 Resistance Checks - General Information
....4.9.02 Main Control Board (UMMB) Voltage Check Points
....4.9.03 Connectors Block Diagram
....4.9.04 Connector Location
105
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115
....4.9.05 Resistance Diagrams - Printhead
........Space and Line Feed Motors
....4.9.06 Head Cable Connection
A Board Diagrams
A1 Board Diagrams - General Information
A.2 Index To Charts
....A.2.01 Main Control Board (UMMB) Original
....A.2.02 Main Control Board (UMMB) Current
....A.2.03 RS232-C Serial Module (UMRS)
B Illustrated Parts Listing
B.1 Overview - General Information
....B.1.02 Definition of Terms
121
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120
Table of Contents
....B.1.03 Parts Ordering Information
B.2 Charts
....B.2.01 Printer
....B.2.02 Covers
....B.2.03 Printer Unit
....B.2.04 Printer Mechanism (1 of 3)
....B.2.05 Printer Mechanism (2 of 3)
....B.2.06 Printer Mechanism (3 of 3)
....B.2.07 Option Parts
....B.2.08 Consumables
....B.2.09 Packaging
....B2.10 Documentation
....B.2.11 Service Training Kit Revision List
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Page: 2
Service Guide ML380
Chapter 0 About This Manual
Manual Copyright
This document may not be reproduced without the written permission of the Okidata Technical Training
Group. Every effort has been made to ensure the accuracy of the information contained in this training course. Okidata is not responsible for errors beyond its control.
© 1994 by Okidata All rights reserved.
First Edition August, 1989 P/N 59238701
Second Edition September, 1993 P/N 59238702
Third Edition November, 1994 P/N 59238703
Written and produced by the Okidata Technical Training Group
Please address any comments on this publication to:
Technical Training Group
Okidata
532 Fellowship Road
Mount Laurel, NJ 08054-3499
Fax Number: (609) 235-2600, ext. 7034
Okilink Login Name: Technical Training
OKIDATA is a registered trademark of Oki Electric Industry Company, Ltd.; marques deposee de Oki
Electric Industry Company, Ltd.; marca registrada, Oki Electric Industry Company, Ltd.
MICROLINE is a registered trademark of Oki Electric Industry Company, Ltd.; marque depose de Oki
Electric Industry Company, Ltd.
Centronics is a registered trademark of Centronics Inc.
PLUG n PRINT is a registered trademark of Oki America, Inc.; marque deposee de Oki America, Inc.
Epson is a registered trademark of Seiko Epson Corporation.
IBM is a registered trademark of International Business Machine Corporation.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 3
Service Guide ML380
Chapter 1 Product Specifications
1.1 OVERVIEW
1.1.01 General Information
The Microline 380 is an 80 column, impact dot matrix printer using a 24 pin printhead. It emulates the
Epson LQ printer.
A push tractor is standard. An optional pull tractor is available.
Font and Character Pitch selection is available through the operator panel, printer menu, or through software (using control codes).
A Centronics Parallel interface is standard. An RS232-C serial module is available as an option.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 4
Service Guide ML380
Chapter 1 Product Specifications
1.2 PHYSICAL SPECIFICATIONS
1.2.01 Dimensions
Width: 15.67 inches (398 millimeters)
Depth: 4.72 inches (120 millimeters)
Height: 13.58 inches (345 millimeters)
NOTE: Dimensions DO NOT INCLUDE the platen knob, acoustic cover, and paper separator.
1.2.02 Weight
17.9 pounds (8.1 kilograms)
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Page: 5
Service Guide ML380
Chapter 1 Product Specifications
1.3 POWER REQUIREMENTS
1.3.01 Input Power
120 VAC: +5.5 / -15%
220/240 VAC: +5.5 / -15%
Single-phase AC
1.3.02 Power Consumption
Operating: 90 VA
Idle: 30 VA
1.3.03 Power Frequency
120 VAC: 50/60 Hz +/- 2%
220/240 VAC: 50/60 Hz +/- 2%
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Page: 6
Service Guide ML380
Chapter 1 Product Specifications
1.4 ENVIRONMENTAL CONDITIONS
1.4.01 Acoustic Rating
57 dBA
1.4.02 Altitude
10,000 feet (3,050 meters)
1.4.03 Ambient Temperature and Relative Humidity (RH)
While operating: 41 to 95 degrees Fahrenheit (5 to 35 degrees Celsius)
Operating humidity: 20% to 80% RH
While in storage: -40 to 158 degrees Fahrenheit (-40 to 70 degrees Celsius)
Storage humidity: 5% to 95% RH
1.4.04 Impact
Non-operating: 3 G or less
1.4.05 Vibration
Operating: 0.3 G (5 to 150 Hz) or less (except at resonating frequency)
Non-Operating: 1 G (5 to 150 Hz) or less (except at resonating frequency)
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Page: 7
Service Guide ML380
Chapter 1 Product Specifications
1.5 AGENCY APPROVALS
1.5.01 Listings
UL No: UL Standard No. 478 and 114
CSA No: CSA Standard C22.2 No. 154
FCC: FCC Certified per Part 15, Subject J, Class B
VDE: VDE 0806, 0875 Class B, and 0836
BS: BS 5850 / 6204
IEC: 435 / 380
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Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML380
Chapter 1 Product Specifications
1.6 OPERATIONAL SPECIFICATIONS
1.6.01 Character Matrix Sizes
Table of Print Speed and Character Matrix
Speed
Mode
Matrix (H x V)
1.6.02 Characters Per Line
LQ
63 cps (12 cpi)
30 x 18
Utility
192 cps (12 cpi)
9 x 17
Maximum Characters Per Line
80
96
120
137
160
Characters Per Inch
10
12
15
17.1
20
1.6.03 Character Pitches
5, 6, 8.5, 10, 12, 15, 17.1, 20 characters per inch
Characters Per Inch = cpi
The character pitches are selected through the following methods.
Operator panel (front panel controls)
Menu Select Mode (Menu Mode)
Control codes in the software
Special Microline 380 drivers
1.6.04 Character Sets
Standard ASCII
EPSON Character Set
IBM Character Set I and II
Foreign Language Sets (14)
Line Graphics
Zero / Slashed Zero
1.6.05 Emulation
Epson LQ
1.6.06 Fonts
HS Utility
240 cps (15 cpi)
7 x 16
Page: 8
Letter Quality
Courier
Letter Gothic
Prestige
Orator
Roman
Helvette
Draft
Utility
Special Font Effects
Emphasized / Enhanced
Outline
Shadow
Double Height
Double Width
1.6.07 Front Panel Switches
SELECT / Exit
FEED / Group
TOF / PARK / Item
FONT / Set
PITCH / Print
1.6.08 Graphics Resolution
Graphics Resolution
Maximum: 180 x 360 dpi
Minimum: 60 x 72 dpi
*1.6.09 Interface
Standard
Parallel
Optional
RS232C Serial, 19.2 Kbytes Super-Speed (Ready/Busy, X-ON / X-OFF)
NOTE:
When the serial interface module is installed, the printer's parallel interface connector is NOT accessible.
1.6.10 Line Feed Increments
Fixed
6 lines per inch (lpi) [0.167 inch (4.23 millimeters)]
8 lines per inch (lpi) [0.125 inch (3.175 millimeters)]
Variable
n/60 inch n/180 inch
1.6.11 Line Feed Time
2.2 inches per second
1.6.12 Menu Mode
Print: Prints the entire menu.
Group: Selects Group Function
Item: Selects Item
Set: Selects Item Value
Exit: Exits Menu Mode, Enters Select
1.6.13 Paper Feed Methods
Standard
Friction Feed (Top)
Push Tractor (Rear)
Optional
Pull Tractor (Bottom / Rear)
Single-Bin Cut Sheet Feeder (Top)
CSF 3800
1.6.14 Paper Feed Paths
Top Feed (Standard)
Rear Feed (Standard)
Bottom Feed (by using an Optional feed mechanism)
Special Features
Paper Park
Semi-Automatic Sheet Feeding
Paper Tear Off
1.6.15 Paper Loading
Semi-Automatic Sheet Feeding
Opening the paper bail arm activates the semi-automatic sheet feeder (SASF)
1.6.16 Paper Out Detection
Distance from end of paper
Rear Feed: 2.3 inches (57 millimeters)
Bottom Feed: 1.4 inches (36 millimeters)
Top Feed: 1 inch (25 mm)
1.6.17 Paper Tear Capabilities
Paper Tear-0ff (sharp edge on access cover)
1.6.18 Print Method
Printhead Type
General Information
Impact Dot Matrix
24 pin printhead
.0079 inch (.20 millimeter) diameter pins
Overheat Protection
When printhead temperature is between 90 and 129 degrees Celsius (ALARM 1), the printer stops bi-directional printing. Uni-directional printing begins.
If the temperature continues to rise (130 degrees Celsius, ALARM 2), printing stops.
Printing will resume when the printhead temperature drops below the ALARM 1 threshold.
NOTE:
Refer to Section Two for more information on printhead operation.
Printhead Gap Information
Two items factor into printhead gap information.
1. Printhead Gap
Adjustment
This is a SERVICE ADJUSTMENT made by a technician.
It is covered in Section 3.3 of this Service Handbook.
The Adjustment measures 0.016, +/- 0.002 inches (0.41, +/- 0.05 mm).
2. Printhead Gap
Adjust
The printhead gap is modified by moving the printhead gap lever, located on the left side of the housing.
To move the lever, pull it towards the printer housing and push the lever towards the front of the printer.
The settings are 1, 2, 3, 4, and 5.
Use 1 for single sheet.
Use 2 for multiple sheets or forms (thickness: 2 sheets).
Use 3 for multiple sheets or forms (thickness: 3 sheets).
Use 4 for multiple sheets or forms (thickness: 4 sheets).
Use 5 for envelopes and extra thick paper.
1.6.19 Print Modes
Letter Quality
Utility
1.6.20 Print Speed
Mode
LQ
Utility
Character
Pitch
10 cpi
50 cps
150 cps
12 cpi 15 cpi
60 cps 75 cps
180 cps 112.5 cps
17.1 cpi
85 cps
128.25 cps
20 cpi
100 cps
150 cps
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML380
Chapter 1 Product Specifications
1.7 PAPER SPECIFICATIONS
CAUTION:
Use Bottom Feed and/or optional Pull Tractor for card stock and labels.
1.7.01 Types
Card Stock
Length: 3 to 14 inches (76.2 to 356 millimeters)
Number of Copies: Original
Paper Feed Path: Bottom
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6
Thickness: .008 inches (0.2 millimeters) Maximum
Weight: 100 lbs. (375 g/m 2 ) Maximum
Width: 5 to 8 inches (127 to 203 millimeters)
Continuous Form
Length: 3 to 14 inches (76.2 to 356 millimeters)
Number of Copies: Original, Original + 2 Interleaf Original + 2 Carbonless
Paper Feed Path: Rear or Bottom
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6
Thickness: Single 0.0028 to 0.0039 inches (0.07 to 0.1 millimeters)
Multi 0.01 inch (.25 millimeter) Maximum
Weight:
Single Part 14 - 22 lb. (52.5 to 82.5 to g/m 2 )
Multi-Part, Carbonless 9 - 11 lb. (35 to 40 g/m 2 )
Multi-Part, Interleaf Paper 10 - 12 lb. (38 to 45 g/m 2 ) Carbon 9 lb. (35 g/m 2 )
Width: 3.5 to 10.5 inches (89 to 267 millimeters)
Cut Sheet
Number of Copies: Original, Original + 2 Interleaf Original + 2 Carbonless
Paper Feed Path: Top
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6.
Note: Multi-part cut sheet paper CANNOT be used.
Weight: 14 to 22 lbs. (52.5 to 82.5 g/m 2 )
Width: 7.2 to 10 inches (182 to 254 millimeters)
Length: 3 to 14 inches (76.2 to 356 millimeters)
Thickness: 0.0028 to 0.0039 inches (0.07 to 0.1 millimeters)
Envelopes
Number of Copies: Original
Paper Feed Path: Bottom
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6.
Size:
Single Feed
Minimum: 6.5 x 3.6 inches (16.5 x 9.1 centimeters)
Maximum: 9.5 x 4.1 inches (24.1 x 10.4 centimeters)
Continuous
Non-overlap type
Thickness: .016 inches (41 millimeters) Maximum
Weight: 17 to 24 lbs. (64 to 90 g/m 2 ) Maximum
Labels
Length: 3 to 14 inches (76.2 to 356 millimeters)
Page: 9
Number of Copies: Original
Paper Feed Path: Bottom
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6.
Weight: N/A
Width: Carrier 3.5 to 8.5 inches (88 to 261 millimeters)
Thickness: .01 inches (0.25 mm) Maximum (including backing)
CAUTION:
Use Bottom Feed and/or optional Pull Tractor for card stock and labels.
DO NOT use fabric labels.
DO NOT print on the edge or perforation of the label.
DO NOT use Paper Park with labels.
Transparency
NOTE:
Roller marks may mar the transparency under high temperature / high humidity conditions.
Length: 3 to 14 inches (76.2 to 356 millimeters)
Number of Copies: Original
Paper Feed Path: Top
Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6.
Weight: 12 to 24 lbs. (45 to 90 g/m 2 )
Width: 8.5 to 11 inches (216 to 280 millimeters)
Thickness: 0.004 inches (0.1 millimeters)
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Page: 10
Service Guide ML380
Chapter 1 Product Specifications
1.8 MEMORY SPECIFICATIONS
1.8.01 EEPROM
256 Kbit EEPROM
Used to store Menu data
Located at Q18 of the main control board
1.8.02 ROM
Program ROM
256 Kbit
Located at Q2 of the main control board
Resident Character Generator ROM
1 Mbit
Masked to the CPU
1.8.03 RAM
32 Kbyte
Located on the main control board
Used as
Receive Buffer
Printer Buffer
Scratch Pad
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Service Guide ML380
Chapter 1 Product Specifications
1.9 CONSUMABLES
1.9.01 Ribbon
CAUTION:
Using a non-Okidata ribbon may damage the printhead and void any warranties.
Material
Cartridge Fabric
Types
Black Nylon Ribbon
Life (On average, at 10 characters per inch, Utility Mode)
Black Ribbon 2 million characters
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1.10 OPTIONS
1.10.01 Cut Sheet Feeders
CSF-3800
Single Bin with envelope capability
Paper Width: 7.2 to 8.5 inches
182 to 216 millimeters
Paper Length: 10.1 to 11.7 inches
257 to 297 millimeters
Capacity: 50 sheets (20 lb.)
Service Guide ML380
Chapter 1 Product Specifications
Page: 12
1.10.02 Pull Tractor Kit
Bottom Feed
Rear Feed (For Push/Pull Operation)
Paper Types: Continuous Feed and Labels
1.10.03 Serial Interface
Super-Speed 19.2K RS-232C
Ready/Busy/X-On/X-Off Protocols
Can be configured through the Menu
When the serial interface module is installed, the printers parallel interface connector is NOT accessible.
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Page: 13
Service Guide ML380
Chapter 1 Product Specifications
1.11 RELIABILITY
1.11.01 Mean Time Before Failure (MTBF)
Approximately 4,000 hours: 25% duty cycle / 35% page density
1.11.02 Mean Time To Repair (MTTR)
Approximately 15 minutes to major sub-assembly level
1.11.03 Printer Life
Approximately 12,000 hours of power-on time: 25% duty cycle / 35% page density
1.11.04 Printhead Life
Average 200 million characters in 10 cpi utility mode @ normal 25% duty, 35% page density
1.11.05 Ribbon Life
Approximately 2 million characters in 10 cpi mode
1.11.06 Warranty (Limited)
One year, parts, labor, and printhead
1.11.07 Service
Authorized Okidata Service Centers
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Page: 14
Service Guide ML380
Chapter 2 Principles of Operation
2.1 ELECTRICAL OPERATION
2.1.01 General Information
The control board consists of the microprocessor and its peripheral circuits, the drive circuits, DC power supply circuit and interface connector. The switches and LED's of the operator panel are mounted on this board.
The power to the control board is supplied by the power supply unit. The power to the other electrical parts is distributed via the connectors on the control board.
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Service Guide ML380
Chapter 2 Principles of Operation
2.1.02 Microprocessor and Peripheral Circuits
Microprocessor (Q5: 83C154GS-551-V1K)
The microprocessor is the nucleus of the control circuit. Its peripheral circuits operate under program control by this microprocessor. The I/O ports of the microprocessor are connected to the address bus, data bus, and control lines.
Program ROM (Q2)
The program ROM (256 Kbit) contains the control program for the printer. The microprocessor operates by execution of this program.
RAM (Q4)
The RAM stores received data (to be printed). (32 Kbytes)
CGROM (Q3)
1 MBit ROM which stores the resident character fonts.
EEPROM (Q18)
This 256-bit serial Electrically Erasable and Programmable ROM stores the Menu Mode data.
LSI (Q7: LC92018B-283)
This LSI switches the phase of the space motor, and generates the timing of print dots for each print density. The LSI performs the following functions.
Space Pulse Motor Control
To obtain the carriage speed instructed by the microprocessor, the LSI generates the pulse switch timing and overdrive time.
Dot Timing generation
Parallel Interface Control
LF Motor Control
LED Drive
General Purpose Input Port
Used to read Operator Board Switches.
LSI (Q6: LC92011B-284)
This LSI drives the 24 pin printhead and controls memory. The following describes the function of the LSI.
Printhead Drive Control
Head Pin Counting Function
Counts the number of printwires to be driven then, changes the duration of the HD ON signal accordingly.
Memory Control
Extends the addressable memory by switching banks in/out.
LED Drive Output Port
Microline 380 Block Diagram
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Page: 16
Service Guide ML380
Chapter 2 Principles of Operation
2.1.03 Initialization
The printer is initialized whenever it is powered ON or when the I-PRIME signal is received at the parallel interface. Initialization is started when the RST-P signal is sent from the reset circuit (Q8:Pin 1) to Q5, Q6 and Q7.
When RST-P is generated, ROM program execution starts with the mode setting of Q5, Q6 and Q7. Next,
ROM and RAM are checked for errors, RAM is initialized and the carriage is homed. The program finally establishes the Interface signals (output level of ACK, BUSY, etc.), switches the SELECT indicator ON, and informs the host computer that the printer is ready to receive data.
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Page: 17
Service Guide ML380
Chapter 2 Principles of Operation
2.1.04 Interface Control
Parallel Interface
The data from the interface is received through connector (CN-1) and the Interface LSI (Q7) latches this data in sync with the STB signal.
The BUSY signal is switched ON as the data is processed. When processing is completed, the BUSY signal is switched OFF and an ACK signal is sent to the host to request more data.
The BUSY signal is also switched ON when the printer is not able to receive data (buffer is full, printer is deselected or an error condition exists).
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Page: 18
Service Guide ML380
Chapter 2 Principles of Operation
2.1.05 Printhead Drive Circuit
This circuit is used to drive the 24 print wires. The signals HD1 through HD24 control the individual print wires. The HD ON signal (even/odd trigger) enables the drive circuit when printing is desired. The head drive duration is determined by an RC integrating circuit which modifies the HD ON pulsewidth. The pulsewidth of the HD ON signal varies with the number of pins being driven. The drive time increases as more pins are driven, and decreases as fewer pins are driven. The RC circuit compensates for the fluctuation of drive voltage (+35 vdc).
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Service Guide ML380
Chapter 2 Principles of Operation
2.1.06 Spacing Drive Circuit
The space motor is driven by a two-phase pulse motor.
The phase signals (Phase 1, Phase 2, Phase 3 and Phase 4) and the basic pulse signals are output from the LSI (Q7). The pulse signals are modified by the drive voltage compensation circuit and sent back to the LSI (Q7).
The space overdrive signals (Phase 1DVOV, Phase 2 DVOV, Phase 3DVOV and Phase 4DVOV) switch
Q16 and Q17 ON, setting up the proper phase relationship of analog space motor drive signals (SP Phase
1 through SP Phase 4). These signals are then sent to the space motor.
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Service Guide ML380
Chapter 2 Principles of Operation
2.1.07 Line Feed Circuit
The line feed motor shaft is held stationary by + 8 vdc (the holding current is approximately 30 ma) whenever in a stopped position.
During line feed operation, the line feed motor is driven in accordance with the LF OVD signal. The signals
LFMO Phase 1 through LFMO Phase 4 establish the proper phase relationship for driving the motor.
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Service Guide ML380
Chapter 2 Principles of Operation
2.1.08 Alarm Circuits
Fault Alarm Circuit (in Power Supply Unit)
This protective circuit causes the AC fuse to open when a fault occurs in the printhead drive circuit or line feed drive circuit, thus preventing component failure.
To accomplish this, the circuit monitors the overdrive signal of each drive circuit. If the duration of any drive circuit exceeds a predetermined time, the appropriate signal (HEAD ALM, LF ALM1 or LF ALM2) will be sent to the fault alarm circuit. The fault alarm circuit generates the ALM signal (high), which switches on an SCR.
This causes the secondary coil (40 volts) of the main transformer to short-circuit, causing an overcurrent to flow through the primary coil and open the AC fuse.
Printhead Overheat Alarm Circuit
In order to protect the printhead coils, this circuit monitors the printhead temperature by using a thermistor contained in the printhead. The CPU senses this circuit every time a line is printed.
Whenever printing, the printhead temperature increases. If the head temperature reaches approximately
90 degrees - 129 degrees Celsius, a head overheat ALARM 1 is generated. When ALARM 1 is detected, bi-directional printing stops. Uni-directional printing begins.
If the printhead temperature continues to increase (130 degrees Celsius), ALARM 2 is generated. Printing stops until the head temperature decreases. When the head temperature drops below the ALARM 1 threshold, printing resumes.
Low DC Voltage Detection Circuit
The + 35 vdc drive voltage is monitored for a low voltage condition during each print operation. If the + 35 vdc drops, the negative terminal input voltage of the comparator (Q8) decreases, the comparator reverses state, and the DC LOW-P signal is switched ON.
When the signal DC LOW-P is active, printing is accomplished by using twelve of the twenty-four printwires in a dual-pass print.
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Service Guide ML380
Chapter 2 Principles of Operation
2.1.09 Paper End Detection Circuit
PAPER END is detected by a photosensor. When the printer detects an out-of-paper condition, the PEN signal goes low, printing is stopped, and the ALARM LAMP is switched ON.
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Service Guide ML380
Chapter 2 Principles of Operation
2.1.10 Power Supply
The power supply consists of the power transformer, the filter board and the DC power supply circuit on the control board.
The AC input voltage is transformed into 8.6 VAC and 46 VAC by the power transformer. These AC voltages are converted to + 8 vdc, + 5 vdc and + 35 vdc levels by the DC power supply circuit on the control board. The + 5 vdc is a regulated voltage.
Filter Board
The filter board consists of the power switch, AC fuse and AC noise filter.
Power Transformer
If the internal temperature of the power transformer rises abnormally, the built-in temperature fuse will open to prevent any damage to other electrical components.
NOTE:
If the temperature fuse in the transformer opens, the transformer must be replaced.
Power Supply Circuit
Converts the AC Voltage input to + 8 vdc, + 5 vdc and + 35 vdc and supplies it to the control board. This circuit also regulates the + 5 vdc.
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Service Guide ML380
Chapter 2 Principles of Operation
2.2 MECHANICAL OPERATION
2.2.01 Printhead Mechanism
The Microline 380 uses a highly efficient stored energy type printhead. Power is not consumed until the printwires are activated, thereby extending the printhead life to approximately 200 million characters.
The printhead uses 24 printwires (two columns of 12 wires each). Each wire is welded to an armature.
Behind this armature is a spacer ring.
Each of the 24 printwire armatures have a permanent magnet behind them. The magnets attract the armatures, drawing the printwires into the wire guide, thus keeping the wires inside the printhead. A coil is wrapped around each of the permanent magnets.
When a dot is to be printed, current is passed through the appropriate coil. This creates a magnetic field which counters the magnetic field of the permanent magnet. The armature can then spring forward and the print wire (which is attached to the armature) strikes the ribbon and imprints a dot on the paper.
When current is removed from the coil, the magnetic field of the permanent magnet attracts the armature, causing the printwire to retract into the wire guide once again.
The printhead contains a built-in thermistor used to monitor the printhead temperature.
The printhead is composed of the following parts.
Wire Guide
Print Wires
Armature Assembly
Yoke
Spring
Spacer
Magnet Assembly
Thermistor
Printed Circuit Board
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Service Guide ML380
Chapter 2 Principles of Operation
2.2.02 Spacing
Spacing is performed when the main shaft (installed in parallel with the platen), and carriage (mounted on the space rack) are driven by the pulse motor.
Spacing involves the parts listed below.
Pulse Motor
Drive Pulley
Idle Pulley
Carriage Shaft
Carriage Frame
Space Rack
Spacing Operation
The carriage containing the printhead moves parallel to the platen along the main carriage shaft and space rack. Power from the space motor is transferred via the mini-pitch belt, which is attached to the bottom of the carriage frame. When the pulse motor rotates clockwise (as viewed from above), the driving force is transmitted to the mini pitch belt through the drive pulley, and the carriage moves from left to right.
The carriage is designed to move 0.8 inch when the pulse motor performs one rotation.
Head Gap Adjusting
The head gap adjusting mechanism adjusts the gap between the platen and printhead. This is accomplished by moving the adjusting lever on the left side of the printer mechanism. When the lever is moved, the carriage shaft rotates. Since the carriage shaft is attached to the printer mechanism with eccentric collars, as the carriage shaft rotates, the distance between the platen and carriage shaft changes.
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Service Guide ML380
Chapter 2 Principles of Operation
2.2.03 Ribbon Drive
The ribbon drive mechanism moves the ribbon in synchronization with the space motor operation.
The ribbon drive mechanism consists of the following items.
Ribbon Drive Gear assembly
Space Rack
Ribbon Cartridge
Ribbon Cartridge
An endless ribbon with a single direction feed is used. Ink is supplied from an ink tank, which is built into the ribbon cartridge.
Ribbon Feed Operation
The rotation of the space pulse motor is transmitted to the drive gear in the ribbon cartridge through the space rack and ribbon feed gear assembly, thereby feeding the ink ribbon.
The feed direction of the ribbon is maintained by switching the rotational direction of the gears in the ribbon drive assembly. This ensures uni-directional ribbon movement when bi-directional printing is used.
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Service Guide ML380
Chapter 2 Principles of Operation
2.2.04 Paper Feed
Paper feeding is performed by turning the platen and the pin tractor. The tractor is driven by the line feed pulse motor.
The paper feed mechanism consists of the following items.
Pulse motor with gears
Idler Gear
Change Spring
Change Gear
Platen
Tractor Feed Unit
Pressure Roller Assembly
Friction Feed
When the release lever is set to the FRICTION FEED position, the change gear is disengaged from the tractor gear. At the same time, the release lever applies pressure to push the pressure rollers against the platen, allowing paper to be fed.
Tractor Feed
When the release lever is set to the TRACTOR FEED position, the release lever allows the reset spring to push the change gear toward the tractor gear. At the same time, the release lever pushes the pressure rollers away from the platen, allowing paper to be fed by the tractors.
NOTE:
Drive power from the line feed motor is transferred from the platen to the idler gear and then to the change gear.
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Service Guide ML380
Chapter 2 Principles of Operation
2.2.05 Paper-End Detection
Continuous Sheet Paper-End
When continuous sheet paper is installed, the paper moves the continuous sheet paper-end lever to A1 and the sensor is switched ON. When out of continuous sheet paper, the paper-end lever moves to position B1 and the sensor is switched OFF indicating a paper-end condition.
Bottom Feed Paper-End
When paper is installed, it moves the bottom paper-end lever to position A2 and the sensor is switched
ON. When a paper out condition exists, the bottom paper-end lever moves to position B2 and the sensor is switched OFF, indicating a paper-end condition.
Cut-Sheet Paper-End
When cut-sheet paper is installed, the paper moves the cut-sheet paper-end lever to position A3 and the sensor is ON. At the end of printing, the cut-sheet paper-end lever moves to position B3 and the sensor is switched OFF, indicating a paper-end condition.
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Service Guide ML380
Chapter 2 Principles of Operation
2.2.06 Semi-Automatic Sheet Feeder (SASF)
The Semi-Automatic Sheet Feeder (SASF) is used to automatically set the print start position when using cut-sheet or continuous sheet paper.
The procedure is as follows.
Cut-Sheet SASF
1. Push the paper release lever to the cut-sheet side (rear of printer).
2. Insert the paper from behind the platen.
3. Open the paper bail arm (pull toward the front of the printer). This activates the SASF switch.
4. Line feed operation will feed the paper 2.76 inches.
If the paper does not move, the SASF motion becomes invalid and is treated like an ordinary paper-end.
5. Once the paper bail arm is closed, a reverse line feed of about 0.18 inches is performed. This moves the paper to the print start position.
Continuous Sheet (Rear Feed) SASF
1. Push the paper release lever to the continuous sheet side (front of the printer).
2. Insert the paper into the push tractor.
3. Open the paper bail arm (pull toward the front of the printer). This activates the SASF switch.
4. Line feed operation will feed the paper 3.6 inches.
If the paper does not move within 2.4 inches of motion, the SASF motion becomes invalid and this is treated like an ordinary paper-end.
5. Once the paper bail arm is closed, a reverse line feed of about 0.18 inches is performed. This moves the paper to the print start position.
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Service Guide ML380
Chapter 2 Principles of Operation
2.2.07 Paper Park
Paper park operates as follows.
1. Press PAPER PARK.
2. Reverse line feed retracts the paper until a PAPER-END condition exists
or
14 inches of paper have been fed.
3. When the PAPER-END condition exists, the printer retracts 0.49 inches of paper. The paper is still installed on the push tractor, but cut sheet paper may now be fed.
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 31
3.1 OVERVIEW
3.1.01 General Information
This section lists the parts replacement, adjustment, cleaning, lubrication, and shipping procedures.
Disassembly should not be performed unless absolutely necessary. NEVER perform disassembly on a malfunctioning printer until you have followed the failure analysis procedures in Section Four of this
Service Handbook.
Follow the procedures listed in
Adjustments and Service Settings
. Adjustments may be required when either consumable or parts are replaced. Failure to perform these procedures could result in unnecessary service calls.
Proper performance of maintenance and cleaning will help to achieve the best possible print quality from the printer.
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 32
3.1.02 Maintenance Tools
The following tools are required to service the printer.
#2 Phillips Screwdriver (with magnetic tip)
Straight-slot Screwdriver
Needle Nose Pliers (4 Inch)
Awl or large, opened paper clip
Wire Cutters
Digital Multimeter
Feeler Gauge (capable of measuring .014 inches)
Shop Vacuum
Clean, soft, and lint-free Cloth
All-Purpose Cleaner
Contact Kleen (Okidata P/N 51802301)
Platen Cleaner
Machine Grease
Machine Oil
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 33
3.1.03 Maintenance Precautions
1. Do not disassemble the unit if it is operating normally.
2. Before starting disassembly and assembly, always turn the AC power switch OFF and pull out the AC plug.
3. Detach the interface cable, if installed.
4. Do not remove parts unnecessarily. Try to keep disassembly to a minimum.
5. Use the recommended maintenance tools.
6. When disassembling, follow the listed sequence. Failure to follow the correct sequence may result in damaged parts.
7. Since screws, collars and other small parts are easily lost, they should be temporarily attached to the original positions.
8. When handling circuit boards use extreme care. Integrated circuits (microprocessors, ROM, and RAM) can be destroyed by static electricity.
9. Do not place printed circuit boards directly on conductive surfaces.
10. Follow the recommended procedures when replacing assemblies and units.
11. Perform the printhead gap adjustment procedure when any of the following occur.
Refer to Section
3.3 of this Service Handbook.
Print Quality is darker on one side of the document.
Parts are replaced.
Printhead (3.2.02)
Space Rack (3.2.04)
Carriage Frame (3.2.13)
12. Perform the space belt tension adjustment procedure when the following parts are installed.
Refer to Section 3.3 of this Service Handbook.
Space Belt (3.2.06)
Space Motor Assembly (3.2.22)
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 34
3.2 DISASSEMBLY/ASSEMBLY PROCEDURES
General Information
This section contains the printer disassembly procedures. Only the removal procedures are explained here. Reverse the procedure for the installation.
At the bottom of each procedure is a listing of the parts covered in that procedure. The Okidata part number, item description, comment (RSPL, Option, Consumable) and cross-reference to Appendix B is provided for each part. Items included in the Recommended Spare Parts List are indicated by the acronym
RSPL. N/A will appear where a part number is not available.
Part Item Comment Appendix B Number Description Reference
This Service Handbook lists the disassembly procedures for major components of the unit. Okidata DOES
NOT recommend disassembling a unit which is operating normally. If you decide to perform disassembly during this training, Okidata recommends that you perform
only
the disassembly procedures for RSPL items. All other procedures are provided to assist you in identifying parts. It is not likely that you will perform these procedures while servicing the unit.
Be sure to read all notes, cautions, and warnings, as they contain important information regarding disassembly / assembly.
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 35
3.2.01 Paper Separator
1. Raise the access cover (1).
2. Move the bail lever (2) toward the front of the printer.
3. Push the paper separator (3) at location A and release it from the platen shaft (4).
4. Lift the paper separator to detach the guide pins (5) from the printer mechanism (6).
P/N N/A AC Cable B.2.03
P/N 53511401 Separator: Paper RSPL B.2.03
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 36
3.2.02 Printhead
1. Move the bail lever (1) to back of the printer.
2. Remove the ribbon cartridge (2).
3. Grasp the tab of the head clamp (3), lift up and swing it 90° in the direction of Arrow A to unlock the printhead (4).
4. Lift the printhead from the carriage frame (5).
NOTE:
Perform the printhead gap adjustment procedure after installing this part.
Refer to Section 3.3 of this Service Handbook.
P/N 52104001 Ribbon: Cartridge Consumable B.2.08
P/N 50079301 Printhead RSPL B.2.03
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 37
3.2.03 Upper Cover Assembly
1. Perform this procedure: 3.2.01.
2. Remove the platen knob (1).
3. Raise the sheet separator (2), and pull it out diagonally in the direction of Arrow A.
4. Do the following to avoid interference when removing the upper cover assembly.
Close the covers of the tractor assemblies (3).
Slide the assemblies to the center of the printer unit.
5. Remove the two screws (4). The screws are at the back of printer, on the bottom.
6. Lift the rear part of the upper cover (5), pull it forward, and remove it.
7. Raise the access cover (6) 90° and remove it from the upper cover.
P/N 50071101 Separator: Sheet (Assembly) RSPL B.2.02
P/N 50071201 Separator: Sheet B.2.02
P/N 53510201 Support: Sheet B.2.02
P/N 51901101 Knob: Platen RSPL B.2.03
P/N 53510401 Guide: Sheet (L) B.2.02
P/N 53510301 Guide: Sheet (R) B.2.02
P/N 53510101 Cover: Access RSPL B.2.02
P/N 53510001 Cover: Middle RSPL B.2.02
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 38
3.2.04 Space Rack
1. Perform this procedure: 3.2.02.
2. Remove the two screws (1) on the carriage plate (2). Do not remove the ribbon feed gear assembly.
3. Slide the carriage frame (3) in the direction of Arrow A, leaving the carriage plate in place.
4. Set the carriage plate under the space rack (4).
5. Release the claw (5).
6. Remove the B side of the space rack from the guide pin (6), and lift the space rack.
7. Remove the C side of the space rack from guide pin (7), and remove the space rack.
NOTE:
Perform the printhead gap adjustment procedure after installing this part.
Refer to Section 3.3 of this Service Handbook.
P/N 53510801 Rack: Space RSPL B.2.04
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 39
3.2.05 Ribbon Feed Gear Assembly
1. Perform this procedure: 3.2.02.
2. Release the four claws (1).
3. Insert a screwdriver into the grooves (2) and pry the claws away from the carriage plate (3).
4. Lift the ribbon feed gear assembly (4) in the direction of arrow A. Slide it in the direction of Arrow B, and remove it.
P/N 50071501 Gear: Ribbon Feed (Assembly) RSPL B.2.06
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 40
3.2.06 Mini-Pitch (Space) Belt
1. Perform these procedures: 3.2.02
and 3.2.05.
2. Use pliers to remove the belt tension spring (1).
3. Loosen the screw (2).
4. Remove the belt (3) from the idle pulley (4).
5. Remove the head connector assembly (5) from the carriage plate (6).
6. Remove the carriage plate.
7. Detach the belt from the space motor assembly gear (7).
8. Remove the belt clamp (8) mounted to bottom of the carriage plate.
9. Use a screwdriver to push the claw of the belt clamp in the direction of arrow A. Then, remove the belt clamp and belt by lowering the claw in the direction of arrow B.
NOTE:
Perform the space belt tension adjustment procedure after installing this part.
Refer to Section 3.3 of this Service Handbook.
P/N 50904801 Spring: Coil RSPL B.2.04
P/N 51304001 Belt: Mini-Pitch (Space Belt) RSPL B.2.06
P/N N/A Screw: Self Tapping B.2.04
P/N 51004001 Slider RSPL B.2.06
P/N 51219201 Pulley: Idle RSPL B.2.04
P/N 53330401 Plate: Carriage RSPL B.2.06
P/N 50704701 Clamp: Belt RSPL B.2.06
P/N 53330301 Bracket: Idle Pulley RSPL B.2.04
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 41
3.2.07 Head Connector Assembly
1. Perform these procedures: 3.2.01
, 3.2.02
, 3.2.03
, 3.2.05
, and 3.2.06
.
2. Remove the two head cables (1) from the connectors (2) on the control board. When cable clamp (3) is lifted, the head cables can be removed.
3. Pull the head cables under the cable guides (4), and remove the head cables.
P/N 56725301 Connector: Head (Assembly) RSPL B.2.06 Head Cable
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 42
3.2.08 Main Control Board (UMMB)
1. Perform these procedures: 3.2.01
and 3.2.03
.
2. Remove the five connectors (1) connected to the control board (2).
3. Remove the five screws (3).
4. Release the two claws (4), and move the control board in the direction of arrow A to remove.
P/N 55047801 PCB: UMMB (Main Control) RSPL B.2.03
w/o ROM
P/N 55938501 IC: EEPROM BR93CS46-Z-NW RSPL B.2.03
P/N 56304201 Fuse: 125V 1.6A RSPL B.2.03
P/N 56304301 Fuse: 125V 2.5A RSPL B.2.03
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 43
3.2.09 Operation Panel
1. Perform these procedures: 3.2.01
and 3.2.03
.
2. Use a screwdriver to release the six claws (1) on the operation panel (2) and remove the operation panel from the control board (3).
P/N 53524301 Sheet: Operation Panel RSPL B.2.03
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 44
3.2.10 Line Feed Motor
1. Perform these procedures: 3.2.01
and 3.2.02
.
2. Use a screwdriver to open the lock levers (1) in the directions of arrows A and B, and push the bracket
(2) of the line feed motor (3) in the direction of arrow C.
3. Pull the line feed motor out of the guide holes (4), in the direction of arrow D.
NOTE:
After installation, check that the platen gear (5) engages firmly and rotates smoothly.
P/N 56507801 Motor: Line Feed RSPL B.2.04
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 45
3.2.11 Photosensor Assembly (Paper End)
1. Perform these procedures: 3.2.01
, 3.2.02
and 3.2.10
.
2. Pull the paper end sensor (1) from the sensor guide (2).
P/N 56106901 Photosensor: (Assembly) RSPL B.2.04 Paper End
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 46
3.2.12 Bail Arms
1. Perform these procedures: 3.2.01
, 3.2.02
, 3.2.10
, and 3.2.11
.
2. Use pliers to remove the left bail arm spring (1).
3. Push claw (2) downward, pull it out of guide hole (3) of main frame and remove the left bail arm (4).
4. Remove the left bail arm from the bail bar (5).
5. Use pliers to remove the right bail arm spring.
6. Push claw downward, pull it out of guide hole of main frame and remove the right bail arm.
7. Remove the right bail arm from the bail bar.
P/N 50911801 Spring: Bail Arm (L) RSPL B.2.04
P/N 53511001 Bail Arm (L) RSPL B.2.04
P/N 50911701 Spring: Bail Arm (R) RSPL B.2.04
P/N 53511101 Bail Arm (R) RSPL B.2.04
P/N 51110501 Shaft: Indicator (Assembly) RSPL B.2.04 Bail Bar
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 47
3.2.13 Carriage Frame
1. Perform these procedures: 3.2.01
, 3.2.02
, and 3.2.03
.
2. Open the supporting point A, and remove the head clamp (1).
3. Insert a screwdriver into the groove of carriage frame (2), and remove ribbon protector (3).
4. Turn the white left adjust bushing (4) to the lower end, and remove it.
5. Turn the black right adjust bushing (5) to the lower end, and remove it.
6. Turn the blue adjusting lever (6) to the lower end.
7. Slide the carriage shaft (7) to the right.
8. Remove the shaft and the adjusting lever.
9. Pull the carriage shaft in the direction of arrow B, and remove it from the carriage frame (8). Be careful not to lose the eccentric collar (9). When installing the eccentric collar, place notched section (10) toward the carriage shaft.
NOTE:
Perform the printhead gap adjustment procedure after installing this part.
Refer to Section 3.3 of this Service Handbook.
P/N 50702901 Clamp: Head RSPL B.2.06
P/N 53056201 Protector: Ribbon RSPL B.2.06
P/N 53330201 Frame: Carriage RSPL B.2.06
P/N 51606501 Bushing: Adjust (L) RSPL B.2.04
P/N 51606601 Bushing: Adjust (R) RSPL B.2.04
P/N 53510701 Lever: Adjust RSPL B.2.04
P/N 51110401 Shaft: Carriage RSPL B.2.04
P/N 50704601 Collar: Eccentric RSPL B.2.04
P/N N/A Code: Earth B.2.04
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 48
3.2.14 Platen Assembly
1. Perform these procedures: 3.2.01
and 3.2.03
.
2. Pull lock levers (1) in the direction of arrow A, and raising them at an angle of 90°. This releases the platen assembly (2) from the main frame (3).
3. Lift the A side of the platen assembly until the B side clears the release lever (4).
NOTES:
After installation, check that the platen gear engages firmly with the line feed motor gear and that the platen rotates smoothly.
Set the release lever to OPEN (front) and check that the groove (5) of the paper chute firmly engages with the groove (6) of the main frame. Then, lock the platen assembly.
P/N 50061305 Platen: (Assembly) RSPL B.2.04
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 49
3.2.15 Pressure Roller Assembly
1. Perform these procedures: 3.2.01
, 3.2.03
and 3.2.14
.
2. Remove the paper chute (1). Be careful not to damage the grounding strap.
3. Open the claw (2), and remove the paper release lever (3).
4. Remove the change gear (4) and the spring (5).
5. Remove the idle gear (6).
6. Remove the boss (7) from the guide hole (8) of the main frame (9), and remove the release link (10).
7. Pull part A of the pressure roller assembly shaft (11) out of the main frame, in the direction of arrow B.
8. Pull the C part of the pressure roller assembly shaft out of the main frame in the direction of arrow D.
9. Remove the shaft.
NOTES:
Installation
Position the tab (12) of the paper chute firmly with the groove (13) of the main frame.
Engage the cut-sheet paper end lever (14), attached to bottom of paper chute, to the bottom paper end lever (15) under the main frame, and install the paper chute.
The Kit: Idler/Change Gear (ML300) includes the change and idler gears. Order this kit when replacing these parts.
P/N 50071701 Chute: Paper (Assembly) RSPL B.2.05
P/N 53511201 Lever: Release RSPL B.2.05
P/N 51219101 Gear: Change RSPL B.2.05
P/N 50915101 Spring: Change Gear RSPL B.2.05
P/N 58227501 Kit: Idler/Change Gear (ML300) RSPL B.2.05
P/N 51216001 Gear: Idler B.2.05
P/N 53511301 Link: Release RSPL B.2.05
P/N 50071601 Roller: Pressure (Assembly) RSPL B.2.05
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 50
3.2.16 Paper Pressure Guide
1. Perform these procedures: 3.2.01
, 3.2.02
, 3.2.03
and 3.2.05
.
2. Working from the underside of the printer mechanism and using a screwdriver, detach the connection hole section (1) from the projection (2) of the main frame (3). Begin at point A and end at point B.
3. Remove the paper pressure guide (4).
NOTE:
On installation, be sure to install the projections and guide plates (5) simultaneously.
P/N 50911501 Guide: Paper Pressure RSPL B.2.05
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 51
3.2.17 Tractor Assembly
NOTE:
Horizontal movement of the left tractor is restricted by a stopper on the lower cover.
1. Perform these procedures: 3.2.01
and 3.2.03
.
2. Remove the tractor drive shaft locking clamp.
3. Open the claw (1), and remove the drive gear (2) from the groove (3) of the drive shaft (4).
4. Release the right groove (5) of the drive shaft from the guide (6) of the main frame.
5. Shift the groove in the direction of Arrows A and B. This releases the left part of the drive shaft from the guide hole (7) of the main frame.
6. Push the left part of lock shaft (8), and move the groove (9) in the direction of Arrow C to release the groove from the hole (10) in the main frame.
7. Shift the lock shaft (8) to the right, and move the shaft in the direction of Arrow D to remove the shaft from the larger guide hole (11).
8. Push the left part of the tractor assembly in the direction of Arrow E, and remove the tractor assembly
(12) while pulling the drive shaft in the direction Arrow F. This moves the shaft out of the guide holes (13 and 14) of the printer frame.
9. Remove the center guide (15), the left pin tractor assembly (16), and the right pin tractor assembly (17) from the two shafts (4) and (8).
NOTES:
Marks A (18) and B (19) of the left (20) and right pin tractors (21) must be aligned when installed.
Install the left pin tractor assembly to the left of the stopper on the lower cover. This limits movement and correctly positions the paper against the paper end sensor.
P/N 50071901 Tractor: Pin [L] (Assembly) RSPL B.2.06
P/N 51216101 Gear: Tractor RSPL B.2.05
P/N 51003901 Guide: Center RSPL B.2.06
P/N 50071801 Tractor: Pin [R] (Assembly) RSPL B.2.06
P/N 51109503 Shaft: Drive RSPL B.2.06
P/N 51110601 Shaft: Lock RSPL B.2.06
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 52
3.2.18 Microswitch Assembly (SASF)
1. Perform these procedures: 3.2.01
and 3.2.03
.
2. The microswitch assembly (1) is fastened to the frame on two pins. The first pin (2) is part of the switch.
The second pin (3) is part of the printer mechanism. The first pin must be released before the switch will pivot on the second pin.
3. To release the first pin, use an opened paper clip to push the pin out of the hole. Access the hole from the inside of the printer frame. Then, pivot the switch on the second pin, in the direction of arrow A, until the switch clears the bracket (4).
4. Remove the microswitch assembly.
P/N 56211301 Microswitch: (Assembly) SASF RSPL B.2.05
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 53
3.2.19 Microswitch Assembly (Home Position Switch)
1. Perform these procedures: 3.2.01
and 3.2.03
.
2. Open the switch clamp (1) and release the home position switch (2) from the pin (3).
3. Pull the switch through the opening (4) in the printer frame.
4. Release the cables from the guides on the frame.
5. Remove the microswitch assembly.
P/N 56211301 Microswitch: (Assembly) RSPL B.2.05 Home Position
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 54
3.2.20 Printer Mechanism
1. Perform these procedures: 3.2.01
and 3.2.03
.
2. Open the claws (1) of the lower cover assembly (2) and lift the printer mechanism (3) to remove it.
P/N 54148708 Screw: No. 3 x 8 MM Self Tapping RSPL B.2.02
P/N 53330101 Plate: Shield RSPL B.2.02
P/N 50071301 Cover: Lower (Assembly) RSPL B.2.03
P/N 53510601 Cover: Lower RSPL B.2.02
P/N 53452701 Foot: Rubber RSPL B.2.02
P/N 50071401 Chassis: Mechanism (Assembly) RSPL B.2.05
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 55
3.2.21 Power Supply Unit
1. Perform these procedures: 3.2.01
, 3.2.03
, and 3.2.20
.
2. Open the claws (1) and remove the AC power cord shock restraint (2).
3. Remove the two screws (3).
4. Remove the grounding cord (4) to the AC power cord (5).
5. Remove the grounding cord (6) to the transformer (7).
6. Remove the four screws (8).
7. Remove the transformer, the AC switch (9), and the AC power cord from the lower cover assembly
(10).
8. The power supply unit is made of the grounding cords, the transformer, the AC switch, and the connector (11).
NOTE:
Installation
Firmly insert the AC switch into the A and B guides of the lower cover. The side with the red line goes is the front.
Be careful not to cover the grounding mark (12) when installing the grounding cords.
P/N 56408201 Power Supply Unit 120V RSPL B.2.03
P/N 56408301 Power Supply Unit 220/240V RSPL B.2.03
P/N 56304101 Fuse: 125V 3.15A RSPL B.2.03
P/N 56304501 Fuse: 250V 1.25A RSPL B.2.03
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 56
3.2.22 Space Motor Assembly
1. Perform these procedures: 3.2.01
, 3.2.03
, and 3.2.20
.
2. Raise the printer mechanism (1), and remove the space motor cord (2) from the guides (3).
3. Open the two claws (4) and pull the space motor assembly (5) in the direction of arrow A.
4. Remove the brackets (6) from the guide holes (7) of the main frame and remove the space motor assembly.
NOTE:
Installation
On installation, align the brackets with guide holes and push the space motor assembly down until it snaps into position under the two claws.
Perform the space belt tension adjustment procedure after installing this part.
Refer to Section 3.3 of this Service Handbook.
P/N 56507901 Motor: Space (Assembly) RSPL B.2.05
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 57
3.2.23 Bottom Paper Guide Lever
1. Perform these procedures: 3.2.01
, 3.2.03
and 3.2.20
.
2. Push the pin (1) of the bottom paper guide lever (2), and remove the pin from the guide hole (3) of the main frame.
3. Remove the pin (4) from the guide hole (5) of the main frame, and remove the bottom paper guide lever.
NOTE:
When the paper chute (6) is installed, the cut-sheet paper end lever (7) must engage firmly with the bottom paper guide lever.
P/N 53510901 Lever: Bottom Paper Guide RSPL B.2.05
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 58
3.3 PRINTER ADJUSTMENTS
3.3.01 General Information
This section contains the procedures for performing adjustments on the printer. These procedures may be required when replacing either consumables or parts. The disassembly/assembly procedures list the required adjustments and refer you to this section. Failure to perform these procedures may result in unnecessary service calls.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 59
3.3.02 Gap Between Platen and Printhead
General Information
The printhead gap adjustment should be performed when the following occur.
1. Print quality is darker on one side of the document.
2. Parts are replaced.
Printhead (3.2.02)
Space Rack (3.2.04)
Carriage Frame (3.2.13)
The printhead gap should measure .016 inch, + / - .002 inch (0.41 + / - 0.05 millimeters)
Procedure
1. Move the release lever (1) to the open position (front).
2. Set the printhead gap adjusting lever (2) to range 1
3. Move the carriage to the left side of the platen and rotate the left adjusting collar (3) to obtain the correct gap between the platen and the printhead.
4. Move the carriage to the right side of the platen and rotate the right adjusting collar to obtain the correct gap between the platen and the printhead.
5. Check the gap setting at the left, center, and right of the platen.
When the gap is correct at all positions, do the following check.
1. Set the adjusting lever to range 5
2. Check the gap setting at the left, center, and right of the platen. It should measure .027 inch, + / - 0.002 inch.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 60
3.3.03 Space Belt Tension
General Information
The space belt tension adjustment should be performed when the following parts are replaced.
Space Belt (3.2.06)
Space Motor Assembly (3.2.22)
Procedure
1. Slightly loosen the screw of the idle pulley.
DO NOT remove the screw.
2. Manually slide the carriage assembly back and forth across the entire length of the platen.
3. Tighten the screw.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 61
3.3.04 Key Combinations
Key Combinations
FONT + PITCH (While ON-LINE)
FONT (Hold during Power-ON)
SEL + FEED (Hold during
Power-ON)
TOF + PARK (Hold during
Power-ON)
FEED (Hold during Power-ON)
SEL + TOF/PARK (Hold during
Power-ON)
Description
Enter Menu Mode (While ON-LINE)
Enter Menu Mode (From Power-OFF
Access Menu if Menu set to LIMITED
OPERATION)
Reset Menu to Factory Defaults.
Activate Rolling ASCII Test
Activate Font Test
Activate Hexadecimal Dump Test
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 62
3.3.05 Menu Operation / Menu Select Mode
NOTE:
Using the front panel or commands sent from the computer will override the features set in the menu.
However, when the printer is powered OFF, features set by these methods will be canceled. Features set in the menu will stay in effect, even when the printer is powered OFF.
General Information
Menu Select Mode allows customization of printer settings and features. Selections made are stored in the printers permanent memory. However, they can be changed through software commands, control panel settings, or by resetting the menu.
When the printer is in Menu Select Mode, the function of the control panel buttons corresponds to the label below them: EXIT, GROUP, ITEM, SET, and PRINT.
The Menu is made up of a number of Groups.
Each Group has a list of Items.
Each Item has several Settings.
Refer to the Printer Handbook for a full explanation of menu selections.
There are two ways of entering the Menu Select Mode: from the Print Mode or when the unit is powered
OFF.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 63
From Print Mode
1. Load continuous feed paper.
2. Verify that the ribbon is correctly installed.
3. Verify that the printer is powered-ON and the SELECT lamp is lit.
4. Press the FONT and PITCH buttons at the same time.
5. The SELECT lamp will go out and MENU MODE will print on the paper.
6. Use the control panel to make menu changes.
Press GROUP to move to the next group in the menu.
Press ITEM to move to the next item within a group.
Press SET to move to the next setting of an item.
7. Press EXIT to save the change(s) and return to Print Mode. The SELECT lamp will light.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 64
From Power-OFF
CAUTION:
Make sure that paper is installed or the printhead will print on the platen. This could damage / destroy the printhead, platen, and ribbon.
1. Verify that continuous feed paper is installed.
2. Verify that the ribbon is correctly installed.
3. Verify that the printer is powered-OFF.
4. Press and hold FONT while powering-ON the printer.
5. The POWER lamp will light. The SELECT lamp will not light. MENU MODE will print on the paper.
6. Use the control panel to make menu changes.
Press GROUP to move to the next group in the menu.
Press ITEM to move to the next item within a group.
Press SET to move to the next setting of an item.
7. Press EXIT to save the change(s) and return to Print Mode.
8. The SELECT lamp will light.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 65
Printing the Menu
Printing the Menu provides a reference of current menu settings.
This will help you move through the menu.
Okidata STRONGLY RECOMMENDS printing the Menu
before
resetting the Menu to factory defaults.
Once the Menu is reset, all customized settings are LOST.
To print the Menu, follow this procedure.
CAUTION:
Make sure that paper is installed or the printhead will print on the platen. This could damage / destroy the printhead, platen, and ribbon.
1. Verify that continuous feed paper is installed.
2. Verify that the ribbon is correctly installed.
3. Enter Menu Select Mode (either from Print Mode or Power OFF).
From Print Mode
Verify that the printer is powered-ON and the SELECT lamp is lit.
Press the FONT and PITCH buttons at the same time.
The SELECT lamp will go out and MENU MODE will print on the paper.
From Power-OFF
Verify that the printer is powered-OFF.
Press and hold FONT while powering-ON the printer.
The POWER lamp will light. The SELECT lamp will not light. MENU MODE will print on the paper.
4. Press PRINT.
5. The Menu will print.
6. Press EXIT to exit Menu Mode.
For more information regarding the menu, please refer to the Printer Handbook.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Sample Menu
Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 66
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 67
Reset Menu to Factory Defaults
CAUTION:
Once the menu has been reset, all customized menu settings will be lost.
Always print the menu before resetting the printer to factory defaults.
To reset the menu to factory default settings:
1. Before resetting the Menu, Okidata STRONGLY RECOMMENDS printing the Menu.
Printing the Menu provides a reference of customized settings.
When the Menu is reset, all customized settings are LOST.
2. Power OFF the printer.
3. Press and hold SEL and FEED while powering ON the printer.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 68
Limited Operation
General Information
One of the menu selections that may be set by the end user is the operator panel function.
Operator Panel Function is an item in the General Control Group of the menu. This item may be set to either Full Operation or Limited Operation.
If the Operator Panel Function is set to Limited Operation the menu cannot be accessed and the operator panel switches listed below are not active.
1. Font
2. Pitch
The Operator Panel Function item is frequently set to Limited Operation on networks or other areas where many users share a printer. Limited Operation prevents the printer settings from being changed.
Procedure
To return the printer to Full Operation, you must modify the menu.
CAUTION:
Determine the preference of the end user regarding this feature. If the printer is on a network, do not reset this item without discussing the change with the network supervisor.
To access the menu when the printer is set to Limited Operation, follow this procedure.
1. Verify that continuous feed paper is installed.
CAUTION:
If paper is not installed, the printhead will print on the platen.
This could damage / destroy the printhead, platen, and ribbon.
2. Verify that the ribbon is correctly installed.
3. Power off the printer.
4. Press and hold FONT while powering ON the printer.
5. The SELECT lamp will not be lit.
When in Menu Mode, the functions printed below the operator panel switches are active.
6. Press GROUP until General Control prints.
7. Press ITEM until Operator Panel Function prints.
8. Press SET until FULL OPERATION prints.
9. Press EXIT to save the change and exit Menu Mode.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Zero Character
Number of DLL Sets
Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 69
Menu Settings
Factory default settings are printed in
Bold Italic
.
Group
Font
General Control
Item
Print Mode
Pitch
Style
Size
Cut Sheet Feeder
Graphics
Paper Out Override
Print Registration
Vertical Control
Symbol Sets
Operator Panel Functions
Interface
Line Spacing
Form Tear-Off
Skip Over Perforation
Auto LF
Page Length
Character Set
Language Set
Setting
LQ Courier
LQ Swiss LQ Roman LQ
Orator LQ Prestige LQ Gothic Utility
10
12 15 17.1 20 cpi Proportional
Normal
Italic
Single
Double
Not
Installed; Installed
Uni-directional
bi-directional
No
Yes
O
- 1 - 2 - 3 - 4 - 5 + 5 + 4 + 3 + 2
+ 1
Full Operation
Limited Operation
Parallel
Serial
6
8 LPI
Off
On
No
Yes
No
Yes
11
11 2/3 12 14 3 3.5 4 5.5 6 7 8
8.5 "
Set I
Set II Epson
American
French German British
Danish I Swedish Italian Spanish I
Japanese Norwegian Danish II Spanish
II Latin American French Canadian
Slashed
Unslashed
0
1
Parallel I/F
Serial I/F
I-Prime Signal
Auto Feed XT
Pin 18 Output
Parity
Serial Data 7 or 8 Bits
Protocol
Diagnostic Test
Busy Line
Baud Rate
DSR Signal
DTR Signal
Busy Time
Valid
Invalid
Invalid
Valid
0 v
+ 5 v
None
Odd Even
8 Bits
7 Bits
Ready / Busy
X-ON / X-OFF
No
Yes
SSD-
SSD+ DTR RTS
9600
4800 2400 1200 600 300
19200 bps
Valid
Invalid
Ready on Power Up
Ready on Select
200 milliseconds
1 second
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 70
3.3.06 Top of Form
General Information
Top of Form is the distance from the top edge of the paper to the first print position on the page (the highest vertical position on the page where the first line of printing will appear).
When setting the top of form, use the lower red line on the ribbon protector as a guideline. The red line shows the baseline of the current printing position.
The Top of Form may be set for each of the paper paths.
· Cut Sheet (single-sheet)
· Rear Feed
· Rear Feed With Pull Tractor
· Bottom Feed
Cut Sheet (Single Sheet)
1. Load paper into the printer.
2. Press the SELECT button to deselect the printer. The SELECT lamp will go out.
3. To move the paper, do either of the following.
To move the paper up, press and hold TOF/PARK and press FEED.
To move the paper down, press and hold TOF/PARK and press FONT.
This moves the paper in increments of 1/180 of an inch.
4. Press TOF/PARK to store the top of form position in memory.
5. Press the SELECT button to select the printer. The SELECT lamp will light.
Rear Feed
1. Load paper into the printer.
2. Press the SELECT button to deselect the printer. The SELECT lamp will go out.
3. To move the paper, do either of the following.
To move the paper up, press and hold TOF/PARK and press FEED.
To move the paper down, press and hold TOF/PARK and press FONT.
This moves the paper in increments of 1/180 of an inch.
4. Press TOF/PARK to store the top of form position in memory.
5. Press the SELECT button to select the printer. The SELECT lamp will light.
Rear Feed with Pull Tractor
1. Load paper into the printer.
2. Press the SELECT button to deselect the printer. The SELECT lamp will go out.
3. Rotate the platen knob to move the paper to the desired position.
4. Press TOF/PARK to store the top of form position in memory.
5. Press the SELECT button to select the printer. The SELECT lamp will light.
Bottom Feed
1. Load paper into the printer.
2. Press the SELECT button to deselect the printer. The SELECT lamp will go out.
3. Rotate the platen knob to move the paper to the desired position.
4. Press TOF/PARK to store the top of form position in memory.
5. Press the SELECT button to select the printer. The SELECT lamp will light.
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 71
3.3.07 Paper Park
General Information
Paper park allows you to switch from continuous feed paper to single-sheet paper without removing the continuous feed paper from the printer. The continuous feed paper will be retracted from the platen and down into the printer housing without disengaging it from the built-in tractor.
After the single-sheet paper is printed, pull the bail lever forward and the continuous feed paper will move back into the print position.
Paper park cannot be used when the optional pull tractor is installed.
Procedure
1. Tear off any printed pages.
2. Make sure the printer is selected. The SELECT lamp must be lit.
3. Press TOF/PARK.
4. The paper will retract from the paper path.
5. Move the paper selection to the single sheet position (towards the back of the printer).
6. Load the single sheet paper.
7. Print the single sheet paper.
To return to continuous feed printing, perform the following procedure.
1. Move the paper selection lever to the continuous form position (to the front of the printer).
2. Pull the bail lever forward.
3. The paper will advance to the loading position.
4. Push the bail lever back and adjust the top of form (if necessary)
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 72
3.3.08 Paper Tear Off
General Information
This feature (when activated) will automatically advance continuous feed paper to the tear-off position after it finishes printing the last page in the document. A few seconds after the printing stops, the printer will move the paper up to the tear-off position, aligning the perforation with the serrated edge on the access cover. The operator will be able to tear off the last printed page without wasting paper or readjusting the printer. When the printer receives data to print, it will automatically return the paper to the top of form position for printing.
Paper tear off can only be used with continuous feed paper fed in from the rear on the built-in push tractor.
It cannot be used with the optional pull tractor.
Procedure
1. Load continuous feed paper into the printer.
2. Verify that the printer is selected (SELECT lamp is lit).
3. Press the FONT and PITCH buttons at the same time. This places the printer in Menu Mode.
The SELECT lamp will go out.
4. Press GROUP until the following line is printed.
Vertical Control Line Spacing 6 LPI 5. Press ITEM to advance the Menu to Form Tear-Off.
6. Press SET to change the menu setting for Form Tear-Off.
To activate form tear off, the setting must be ON.
To deactivate form tear off, the setting must be OFF.
7. Press SELECT to exit Menu Mode.
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 73
3.3.09 Resets
Reset Menu to Factory Defaults
CAUTION:
Once the menu has been reset, all customized menu settings will be lost.
Always print the menu before resetting the printer to factory defaults.
To reset the menu to factory default settings, follow this procedure.
1. Before resetting the Menu, Okidata STRONGLY RECOMMENDS printing the Menu.
Printing the Menu provides a reference of customized settings.
When the Menu is reset, all customized settings are LOST.
2. Power off the printer.
3. Press and hold SEL and FEED while powering ON the printer.
NOTE: Refer to the Printer Handbook for a list of the factory default settings.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 74
3.4 CLEANING
3.4.01 General Information
NOTE: Always power OFF the printer before cleaning.
Clean the inside of the printer every 6 months or 300 hours of operation, which ever comes first.
It will take approximately 10 minutes to clean the printer.
Use a dry, lint free cloth, and vacuum cleaner.
Areas to be Cleaned
Carriage Shaft and Vicinity
Remove or vacuum out the paper particles, wipe out dirt, dust, ribbon waste, etc.
Paper Feed Area and Pin Surfaces
Clean the pin roller part of platen.
Paper End Sensor
Wipe or vacuum out the dust from the sensors.
Platen
Clean with platen cleaner.
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 75
3.5 LUBRICATION
3.5.01 General Information
This equipment is designed to be maintenance-free and oiling is unnecessary during operation.
However, when assembly or cleaning of oiled parts occurs, lubricant is required.
1. Lubricant
Grease-type lubricant
Machine Oil (or equivalent)
Areas to be Lubricated
Carriage Shaft
Wipe the carriage shaft with a lint-free cloth that has been
lightly
dampened with machine oil.
Then, wipe the carriage shaft with a dry, lint-free cloth
Space Rack
Apply a
small
amount of grease to the space rack gear teeth.
CAUTION:
If you apply lubricant to the following areas, the printer may be damaged or output quality can be degraded.
Carriage Drive Belt
Flexible Head Cable
Microswitches
Platen Surface
Pressure Roller Surface
Pressure Rollers (on Paper Bail Bar)
Printhead
Ribbon Cartridge
Tractor Pins
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Service Guide ML380
Chapter 3 Maintenance & Disassembly
Page: 76
3.6 SHIPPING INSTRUCTIONS
3.6.01 Return for Service
CAUTION:
When shipping the printer, use the original packaging to prevent damage.
Be sure to secure the printhead so it will not move during shipment.
1. Locate the original packaging or order replacement packaging from Okidata. (Refer to Appendix B)
2. Make sure the printhead is secured so it will not move during shipment.
3. Remove the platen knob. Be sure to place it in the shipping container.
4. Pack the unit, using the materials from Step 1.
3.6.02 All Other Returns
CAUTION:
The product MUST be returned in the original packaging.
The product MUST be returned with ALL originally supplied factory items.
Be sure to secure the printhead so it will not move during shipment.
1. Locate the original packaging or order replacement packaging from Okidata. (Refer to Appendix B)
2. Locate the originally supplied factory items. (Refer to Setting Up in the Printer Handbook)
3. Make sure the printhead is secured so it will not move during shipment.
4. Pack the unit, using the materials from Step 1.
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Page: 77
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.1 OVERVIEW
4.1.01 Introduction
This section is used to isolate problems to the assembly level. Application problems and detection of faulty components on the printed circuit boards are NOT addressed.
When troubleshooting a defective unit, follow these steps.
1.
Refer to Section 4.3
, which explains where to check for updates to the troubleshooting information.
2.
Section 4.4
, contains tips on preventing problems, as well as a list of common problems.
3.
Section 4.5
, shows samples of abnormal outputs.
4.
Section 4.6
, provides tables of error messages.
5.
Section 4.7
, contains the Repair Analysis Procedures (RAPs). Each RAP will ask you questions or require you to make observations. The answers to these questions and the results of your observations determine your next course of action. Use the RAP Index to identify which RAP should be used to resolve the problem with the machine.
6.
Section 4.8
, provides the procedures for various printer tests.
7.
Section 4.9
, lists the resistance check points.
8.
Section 4.2
, lists methods for reporting problems. If you encounter a situation that is NOT addressed by the documentation in this kit, please report the problem to Okidata, using one of the methods listed.
Refer to the Service Center Reference Guide for information on contacting Okidata.
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Page: 78
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.1.02 Printer Serial Number Identification
To identify the revision level of a printer, record the serial number from the back of the printer.
Refer to the following to decode the serial number.
Example Printer Serial Number: 401A0154693
Date Code 401 (4 = year; 01 = month)
Revision A
Serial Number 0154693
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.1.03 Firmware Revision Identification
To identify the revision level and part number of the firmware, print the Rolling ASCII Test or the Font
Test.
Refer to Section 4.8 for information on printing the tests.
Header
At the top of each test is a header.
This header provides the following information: printer model (1) , emulation (2), version (3), firmware revision number (4), firmware part number (5), character generator revision number (6), and character generator part number (7).
ML380 EPS A F/W 03.01 YR4077-xxxx RES 01.00 YR4084-xxxx 1 2 3 4 5
7 6
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Page: 80
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.2 REPORTING PROBLEMS
4.2.01 General Information
Okidata strives to provide accurate and detailed service information through its training materials. The
Technical Training Group realizes that service technicians have valuable experience, knowledge, and opinions. Okidata strongly encourages you to report any problems you may encounter when using the materials of this training kit. Please be as specific and detailed as possible. Your comments, suggestions, and criticisms are used to update and revise training kits.
You should reference the training materials when servicing Okidata products. Most problems can be solved by using the information provided in the training materials. If you encounter a situation that cannot be solved, please let Okidata know.
Refer to the Service Center Reference Guide for information on contacting Okidata.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Page: 81
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.2.02 Problem Lists
Technicians frequently request a list of common problems specific to a product. Technical Training Kits are written before a product is shipped to customers. Therefore, such information is NOT available when a product is first released.
However, Okidata wants to respond to these requests. Okilink II provides round-table discussions on technical problems. Errors and corrections in the training materials are listed in the Training Section of
Okilink II. The Technical Service Bulletins (also known as Okidata's Monthly Mail) are available via Okilink
II. Situations that are NOT addressed in the reference documentation, technical service bulletins, or round-tables may be reported to the Dealer Service and Support Engineers (Contact Technical Support) or the Technical Training Group. You will receive a response to your message within one business day.
The information on Okilink II is the most accurate and up-to-date technical information available from
Okidata. This is only possible with your assistance. By reporting your suggestions, concerns, and problems, Okidata can provide the best possible information.
Your cooperation is greatly appreciated. Thank you for your help!
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Page: 82
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.2.03 Reporting Methods
Okilink II
You may use Okilink II to report your findings. Refer to the Service Center Reference Guide for information on using Okilink II.
Course Critique
Use the Course Critique to report any problems you find as you are completing the self-paced training.
Fax Number
If you wish to fax your response, please use the numbers listed in the Service Center Reference Guide.
Mailing Address
If you respond by mail, please use the appropriate address listed in the Service Center Reference Guide.
Information Provided
Please provide the following information when reporting problems.
Okidata Dealer Number
Technicians Name
Company Name
Company's Address (Street, City, State/Province, ZIP / Postal Code, Country)
Telephone and Fax Numbers (with area / country access codes)
Product Name
Units Serial Number
Firmware Revision Level
Description of Problem
Document Name (with page number or procedure) with error or problem.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.3 TROUBLESHOOTING UPDATES
4.3.01 General Information
Okidata distributes updated troubleshooting information in three ways.
Okilink II
Faxable Facts
Technical Service Bulletins
4.3.02 Okilink II
Okilink II is Okidata's Bulletin Board Service. This service is available to all Okidata Certified Service
Technicians. Okilink II provides troubleshooting and service information. Technicians can download files, ask questions of Okidata's technical support personnel, and participate in round table discussions about
Okidata products and services. Technical Service Bulletins,
Recommended Spare Parts Lists, Printer Drivers, Product Specifications, and Service Training
Information are also available.
Refer to the Service Center Reference Guide for information on accessing Okilink II.
4.3.03 Faxable Facts
Okidata's Faxable Facts is an automated fax document retrieval system. It is maintained by Okidata's
Customer Information Center. Answers to common questions about Okidata products are available through Faxable Facts.
Refer to the Service Center Reference Guide for information on accessing Faxable Facts.
4.3.04 Technical Service Bulletins
Okidata's Technical Service Bulletins (TSB's) contain technical information developed after product release. Firmware updates, part number changes, and procedural changes are some of the subjects covered by these bulletins. The TSB's are distributed through Okilink II.
Refer to the Service Center Reference Guide for information on accessing Okilink II.
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Page: 84
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.4 TROUBLESHOOTING TIPS
4.4.01 Preliminary Checks
1. Is the product being operated under the proper ambient conditions?
2. Does the paper being used meet the specifications for this product?
3. Has the ribbon been replaced as recommended?
4. Has the ribbon been installed properly?
5. Is an Okidata ribbon being used?
6. Is the printhead gap correctly set?
7. Is the firmware the latest (current) revision?
8. Are the printer drivers being used correct for the printer?
9. Is the printer driver being used the latest (current) release?
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.4.02 Problem Categories
There are three categories of problems that you might encounter when servicing the printer.
SELECT Lamp Blinks (Fatal Errors)
The following can cause the SELECT lamp to blink.
Open Bail Arm
Jammed Paper
Printhead Cannot Move
Other Fatal Error
When the SELECT Lamp is blinking, check the items listed below.
1. Close the bail arm.
2. Check for a paper jam.
3. Verify that the printhead moves freely.
4. Record the status of the POWER, SELECT, Font Indicators, and Pitch Indicator Lamps.
5. Refer to the Fault Alarms Tables (Section 4.6)
6. Locate the error.
7. Perform the designated corrective action.
Operational Errors
An Operational Error is usually not accompanied by a fault alarm indication.
Refer to the Start Here Flowchart (Section 4.4.03) and perform the corrective action.
SELECT Lamp Blinks Slowly (Paper End/Jam Conditions)
A slowly blinking SELECT lamp usually indicates a cover open, paper jam or paper-end (out of paper) condition.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.4.03 START HERE Flowchart
START
Power ON the unit.
Does the printer initialize?
NO Is SELECT blinking?
NO Refer to RAP 01.
YES Refer to Section 4.6 of this Service Handbook.
YES Load the printer with paper.
Does the paper load without jamming?
NO Refer to RAP 04.
YES Perform the Rolling ASCII test. Refer to Section 4.8 of this Service Handbook.
Is the output satisfactory?
NO Refer to Section 4.5 of this Service Handbook.
YES Are all operator panel switches operating properly?
NO Replace the operator panel.
YES Has the problem been resolved?
YES End of procedure.
NO Does the parallel or serial interface port receive data from the host PC properly?
YES End of procedure.
NO Which port is NOT receiving data?
Parallel Refer to RAP 05.
Serial Refer to RAP 05.
End of procedure.
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Page: 87
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.4.04 Tips for Preventing Image Problems
1. Make sure that the ribbon is not "dried out". If the printer output is faded, install a new ribbon, then print another sample.
2. Make sure that the paper you are using is within specifications.
Paper specifications can be found in Section 1 of this Service Handbook.
3. Make sure that the printhead gap adjust lever is in the appropriate position for the paper being used.
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Page: 88
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.4.05 Common Problems
1. Nothing happens at all when the operator powers ON the printer.
The printer may not be plugged in. Check the power cord connection to the outlet. If you're using a power strip, make sure its turned on. Check to be sure that the external line fuse hasn't blown or that the circuit breaker hasn't tripped.
2. The printer doesn't print when the computer sends it data.
The printer may be deselected. If the SELECT lamp is not lit, press the SELECT button.
3. The paper keeps jamming.
Be sure to set the top of form so that the paper is held in place by the bail. If the top of the page is below the bail, it will catch on the bail as it advances. Don't use the FEED button to load paper into the printer. Use the bail lever. If you are using continuous forms, be sure that you have the paper loaded squarely onto the tractors. If the sprocket holes are out of sync on either side, the paper will jam.
If the paper does jam, back it out of the printer carefully using the platen knob. Be sure to remove any shreds of paper from the printer before loading the paper. If you're using continuous feed paper, you can do this by using the following procedure.
Back the paper out of the printer.
Fold the paper over three times to produce a page four sheets thick.
Load the folded sheet onto the tractor pins.
Turn the platen knob to bring the paper around the platen.
This will clear the pieces of jammed paper out of the tractor path and bring them up and out so you can dispose of them. Don't forget to remove the quadruple thick sheet from the printer before you return to printing!
4. Dots are missing on printouts.
The head gap may not be set correctly. Try moving the head gap lever to a lower setting. If that doesn't help, the printhead may be damaged.
5. Word processor files don't print the way the menu and front panel are set.
Before sending a file to the printer, many word processors send either an initialization string or an I-Prime signal to the printer.
The initialization string contains codes that reset the printer to a default set of features. Otherwise, the printer might accidentally print using features set for a previous job. These codes will override panel or menu settings. Check your word processors manual to see if you can customize the initialization string. If so, remove any codes that interfere with your printers settings.
The I-Prime signal is sent over the parallel interface and will automatically override any settings you have made using the front panel buttons. To eliminate this problem, go into the Menu Select Mode and change the I-Prime item to INVALID. This will cause the printer to ignore the I-Prime Signal.
6. The FONT and PITCH buttons wont work.
The Operator Panel Functions item in the Printer Menu can be used to disable these buttons. If the printer is part of a customized system or if it is used by a number of people, the system manager may have used this option to make sure the printer is always set properly.
7. None of the lights in the FONT indicator on the front panel are lit.
The lights in the FONT indicator on the front panel all go out when the printer is operating in the utility mode. The lights will come on again as soon as you select an LQ font.
8. You need to check the data sent by the computer to the printer.
Use the hexadecimal dump mode.
To enter this mode, hold the SELECT and TOF/PARK buttons down while powering ON the printer.
All data sent to the printer, including text and printer commands, will print in both hexadecimal and ASCII format. In the ASCII format, all non-printable codes will be represented by a period.
To return to normal printing, power OFF the printer, then power ON.
9. Static electricity causes the paper to stick.
In cold, dry weather, static charges can build up on continuous feed paper. This can make the paper cling to the paper separator. If you have this problem during high-volume printing jobs, try moving the single sheet paper guides on the separator together so that the paper rests on the guides rather than on the separator itself.
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4.5 ABNORMAL OUTPUT
4.5.01 Output Samples
Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 89
Light Print on the Entire Page
Possible Causes:
1. Ribbon is "dried out". Replace the ribbon.
2. Verify that the headgap lever setting is appropriate for the type of paper being used.
3. Check / perform the printhead gap adjustment.
4. Paper is not within specification. Refer to Section One for paper specification.
Uneven Print Density
Possible Causes:
1. Printhead gap not within specification. Perform the printhead gap adjustment.
2. Defective platen. Replace the platen.
Smeared Print
Possible Causes:
1. Ribbon protector is missing or broken. Replace the ribbon protector.
2. Verify that the headgap lever setting is appropriate for the type of paper being used.
3. Check / perform the printhead gap adjustment.
4. Paper is not within specification. Refer to Section One for paper specification.
Inconsistent Line Feed
Possible Causes:
1. Power OFF the printer. Turn the platen knob. The platen should rotate smoothly. If it does not, remove the cause of the binding.
2. Defective line feed motor. Replace the line feed motor.
Drifting Margin
Possible Causes:
1. Power OFF the printer. Move the carriage assembly. The carriage should move smoothly. If it does not, remove the cause of the binding.
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Page: 90
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.6 FAULT ALARMS
4.6.01 General Information
Follow these guidelines when using the Troubleshooting Tables.
1. Record the status (OFF, solidly ON, Flashing) of the Operator Panel LED's.
2. Go to the Fault Alarm Lamp Display Table (Section 4.6.02).
3. Look for the LED Indications you have observed.
4. The Table will provide a Failure Description, Probable Cause and Recommended Action.
5. The Recommended Action will direct you to take action.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.6.02 Fault Alarm Lamp Display
When the printer detects an alarm condition, the LED's are used to display the status of the alarm. The following tables show the alarm status conditions.
Printer Mode Display Table
SELEC
T
LED
ON
Printer Mode
OFF
Slow
Blink
Normal Operation
Mode
Normal Operation
Mode
Normal Operation
Mode
Normal Operation
Mode
Operator Alarm
Condition
Operator Alarm
Condition
ON
Fast
Blink
Operator Alarm
Condition
Operator Alarm
Condition
Internal Fault
Alarm
Definition Recommended Action
ON-LINE Printer is ready to receive data and print
Hex
Dump
Printer is in HEX Dump
Mode
OFF-LINE Printer is in Local Mode and will not accept data
Menu
Paper-en d
Paper
Jam
CSF
Paper
Jam
Suppress
Normal Operation
Normal Operation
Normal Operation
Printer is in Menu Mode
(see Printer Handbook)
Out of paper condition
Normal Operation
SASF /Tractor Paper is jammed
Load Paper. If paper is installed check for jam.
Clear jam. If no jam exists check / replace the sensor.
Clear jam. If no jam exists check / replace the sensor.
Paper is jammed when the Cut Sheet Feeder is installed
Printer has received a
"Stop Printing" command from the Host
Computer
Normal Operation
See Internal Fault
Alarm Conditions Table for additional information
See Internal Fault Alarm
Conditions Table for additional information
Internal Fault Alarm Conditions Table
LED's Lighted *
Courier 10
Prestige 10
Prestige 20
Roman 10
Prestige 15
Prestige Roman 10
Courier Prestige 10
Courier Prestige 20
Courier Prestige 15
Courier 20
Error Condition
Memory Error
Memory Error
Memory Error
Memory Error
Memory Error
Memory Error
Spacing Error
Spacing Error
Printhead Error
Serial Interface
Error
Definition
MPU Internal RAM
Error
Program ROM Error
EEPROM Error
External RAM Error
Resident Character
Generator Error
Resident Character
Generator
Head Homing Error
Spacing Error
Thermistor Open Error
Serial Interface
ROM/RAM Error
Recommended Action
Replace the main control board.
Replace the main control board.
Replace the main control board.
Replace the main control board.
Replace the main control board.
Replace the main control board.
1. Check for binding by manually moving the carriage assembly.
2. Replace the space motor.
3. Replace the main control board.
Refer to RAP 02
Replace the printhead.
Replace the main control board.
Replace the serial interface module.
* The POW LED will be turned ON and the SELECT LED will be flashing.
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Page: 92
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.7 REPAIR ANALYSIS PROCEDURES (RAPs)
4.7.01 Using the RAPs
When using the Repair Analysis Procedures, follow these steps.
1. Go to the RAP Index.
2. Find the RAP which is associated with the printers problem.
3. Go to the appropriate RAP.
4. All RAPs begin with a START statement, followed by questions or another type of statement.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.7.02 RAP Index
03
04
05
RAP
01
02
Description
No Power
Spacing Operation Does Not Operate Normally
Wrong Character Or Missing Dots
Line Feed Problems
Data Receiving Failure
Page: 93
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Page: 94
Service Guide ML380
Chapter 4 Failure & Repair Analysis
RAP 01: No Power
START
Is AC cable connected correctly?
NO Connect the AC cable correctly.
YES Is the AC fuse F1 on the transformer assembly open?
YES Replace the fuse.
NO Are +5V and +35V output on the control board?
Refer to Appendix A of this Service Handbook.
YES Go to A.
A
Check fuses F1 and F2 on the control board.
Are they open?
YES Replace the open fuses(s).
NO Is the connector CN9 on the control board connected properly?
NO Attach connector CN9 properly.
YES Remove connector CN9.
Is 28 VAC output between pins 1 and 2 on CN9?
Is 9 VAC output between pins 3 and 4 on CN9?
NO Replace the transformer assembly.
YES Replace the control board.
End of procedure.
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Page: 95
Service Guide ML380
Chapter 4 Failure & Repair Analysis
RAP 02: Space Operation Does Not Operate Normally
START
Is the carriage assembly movement erratic or is the carriage jammed?
YES Check around the carriage assembly, space belt, space motor, and space rack for any obstructions, or mechanical problems.
Check ribbon drive mechanism for smooth operation.
NO Are +5V and +35V on the control board?
Refer to Appendix A of this Service Handbook.
NO Go to RAP 01, Item A
YES Is the connector CN8 on the control board connected properly?
NO Connect it properly.
YES Replace the control board.
Is condition corrected?
YES End of procedure.
NO Replace the space motor.
End of procedure.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
RAP 03: Wrong Character or Missing Dots
START
Are connectors CN6 and CN7 on the control board connected properly?
NO Connect them properly.
YES Is the head cable inserted into the printhead connector correctly?
NO Seat the head cable to the printhead connector correctly.
YES Replace the printhead.
Is condition corrected?
YES End of procedure.
NO Replace the control board.
Is condition corrected?
YES End of procedure.
NO Replace the head cable.
End of procedure.
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Page: 97
Service Guide ML380
Chapter 4 Failure & Repair Analysis
RAP 04: Line Feed Trouble
START
Rotate the platen knob. Does the platen rotate smoothly?
NO Ensure no foreign matter or dust is present on the platen gear, or line feed motor gear.
Check for smooth meshing of the platen gear and line feed motor gear.
Ensure correct operation of the push tractor assemblies (both right and left), and the tractor drive gears.
YES Is connector CN4 on the control board connected properly?
NO Connect it properly.
YES Is fuse F1 on the control board open?
YES Replace fuse.
NO Replace the line feed motor.
End of procedure.
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Page: 98
Service Guide ML380
Chapter 4 Failure & Repair Analysis
RAP 05: Data Receiving Failure
START
Is the SELECT Lamp ON?
NO Press the SELECT Switch
YES Is the interface cable connected correctly?
NO Connect it correctly.
YES Is the serial interface module properly seated?
NO Properly install the serial interface module.
YES Are the serial interface parameters properly set in the menu?
Refer to the Printer Handbook, Chapter Three
OR
Refer to Section Three of this Service Handbook.
YES Replace the serial interface module
NO Set the serial interface parameters through the menu
Refer to the Printer Handbook, Chapter Three.
End of procedure.
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Page: 99
Service Guide ML380
Chapter 4 Failure & Repair Analysis
4.8 PRINTER TESTS
4.8.01 General Information
This section covers the tests listed below.
· Rolling ASCII Test
· Font Test
· Serial Interface Loopback Test
· Hexadecimal Dump Mode
The Rolling ASCII and Font Tests check print operations.
The Serial Interface Loopback Test checks the operation of the serial interface board.
The Hexadecimal Dump Mode checks the data transfer between the computer and printer.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 100
4.8.02 Rolling ASCII Test
General Information
The Rolling ASCII Test gives a continuous sample of the default print style. The rolling ASCII test is a continuous printout of all 96 ASCII characters. This is an excellent way to check print quality across and down an entire page.
Use this test to check the following items.
1. Print Quality
Across the entire length of a line
Down the entire page
2. Line Spacing
3. Left Margin Alignment
Header
At the top of the test is a header.
This header provides the following information: printer model (1) , emulation (2), version (3), firmware revision number (4), firmware part number (5), character generator revision number (6), and character generator part number (7).
ML380 EPS A F/W 03.01 YR4077-xxxx RES 01.00 YR4084-xxxx
CAUTION
Before running this test, make sure that continuous feed paper is loaded.
Running the test without paper loaded or having the wrong width paper loaded will allow the printhead to print on the platen. This will dirty the platen, cause excessive wear on the ribbon, and may damage the platen, ribbon, and printhead.
1 2 3 4 5
7 6
Procedure
Follow these steps to print the Rolling ASCII Test.
1. Load continuous feed paper into the printer.
2. Power OFF the printer.
3. Press and hold the TOF/PARK button while powering ON the printer.
4. The test will print.
5. To stop the test, press SELECT.
Sample
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 101
4.8.03 Font Test
General Information
The Font Test gives samples of the various fonts and sizes available with the Microline 380 printer.
Header
At the top of the test is a header.
This header provides the following information: printer model (1) , emulation (2), version (3), firmware revision number (4), firmware part number (5), character generator revision number (6), and character generator part number (7).
ML380 EPS A F/W 03.01 YR4077-xxxx RES 01.00 YR4084-xxxx
CAUTION
Running the test without paper loaded will allow the printhead to print on the platen. This will dirty the platen, cause excessive wear of the ribbon, and may damage the platen, ribbon, and printhead.
Procedure
1. Load continuous feed paper into the printer.
2. Power OFF the printer.
3. Press and hold the FEED button while powering ON the printer.
4. The test will print.
This test is two pages long.
5. When the test has finished printing, the SELECT lamp will light.
To stop printing the test (before it is complete), follow these steps.
1. Press the SELECT button.
2. The printer will finish printing the current line.
3. The printer will perform a line feed and a carriage return. 1 2 3 4 5
7 6
Sample
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 102
4.8.04 Serial Interface Loopback Test
General Information
This test isolates the printer from the computer and monitors the operation of the serial interface.
In order to run this test, the serial interface board must be installed with a serial loopback test connector attached to it.
Refer to the diagram in the next section for the connector configuration.
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Loopback Connector Configuration Diagram
1. Jumper the following pins together:
Pin 2 to Pin 3
Pin 4 to Pin 5
Pin 8 to Pin 11
Pin 6 to Pin 20
Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 103
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 104
Procedure
1. Load continuous feed paper.
2. Verify that the printer is selected (SELECT lamp is lit).
3. Press the FONT and PITCH buttons at the same time. This places the printer in Menu Mode.
The SELECT lamp will go out.
4. Press GROUP until you access the Serial Interface group.
5. Press ITEM until you access the Diagnostic Test item.
6. Press SET until YES is specified.
7. Press SELECT to exit Menu Mode.
8. Power OFF the printer.
9. Remove the serial interface cable.
10. Install the test connector.
11. Power ON the printer. This will start the test.
12. The printer will check the memory function and the signal logic.
If both are functioning properly, the following will be printed.
LOOP TEST RAM GOOD I/F GOOD
If either is malfunctioning, the following will be printed.
LOOP TEST RAM BAD (if the memory function is faulty) I/F BAD (if the signal logic is faulty)
13. The printer will generate a test pattern, send the data through its transmit and receive circuits, and write the data to its message buffer. It will then print the stored data. The test pattern consists of the
ASCII characters equivalent to the decimal values 32 to 126. The process repeats until the test is stopped.
14. Press MODE to stop the test.
15. Remove the test connector.
16. Install the serial interface cable.
17. Power OFF the printer.
18. Press and hold FONT while powering ON the printer. This will place the printer in Menu Mode.
19. Press GROUP until you access the Serial Interface group.
20. Press ITEM until you access the Diagnostic Test item.
21. Press SET until NO is specified.
22. Press SELECT to exit Menu Mode.
NOTE: If you do not set Diagnostic Test to no, the printer will enter the test mode at each power ON.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 105
Serial Cable Information
The information in this section will help you make a serial cable to connect between the printer and computer.
Refer to the computer documentation to determine the cable requirements on the computers end.
The printer has the following cable requirements.
· Shielded, RS-232C cable
· UL and CSA approved
· No more than 50 feet long
· Cannon DB-25P plug (or equivalent) with 25 pins
· Cannon DB-C2-J9 (or equivalent) connector shell
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 106
Serial Interface Signal Requirements
Pin
1
2
3
Signal
Protective Ground
Transmit Data
Receive Data
Symbol
PG
TD
RD
4
5
6
Request to Send
Not Used
Data Set Ready
RTS
DSR
SG 7
8 to
10
11
Signal Ground
Not Used
12 to
19
20
Supervisory Send
Data
Not Used
21 to
25
Data Terminal
Ready
Not Used
SSD
DTR
Direction Description
Ground Connected to the printer frame
From
Printer
To
Printer
Serial data transmitted to the system
Serial data received by the printer
From
Printer
Always set to low (mark)
To
Printer
Ground
Indicates that data can be sent
Ground
From
Printer
From
Printer
Indicates that the printer is not ready to receive data
Indicates that the printer is not ready to receive data
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Commonly Used Serial Cable Configurations
IBM 25-Pin Cable Configuration
Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 107
IBM 9-Pin Cable Configuration
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 108
4.8.05 Hexadecimal Dump Mode
General Information
The hexadecimal dump mode allows you to view the data sent from a computer to the printer. When the printer is in hex dump mode, all data received (both printable characters and control codes) will be printed in both hexadecimal and ASCII format.
NOTE: In the ASCII format, all non-printable characters will be represented by a period.
Example
Below is a line of BASIC code.
LPRINT CHR$(27) ;"0";CHR$(30);"This is an example of hexadecimal dump."
Below is the same line as it would appear in Hexadecimal Dump Mode.
1B 30 1E 54 68 69 73 20 69 73 20 61 6E 20 65 78 .0.
This is an example of a hexadecimal dump
61 6D 70 6C 65 20 66 20 61 20 68 65 78 61 64 65 63 69 6D 61 6C 20 64 75 6D 70 2E 0D 0A
Procedure
Follow these steps to engage the Hexadecimal Dump Mode.
1. Make sure the printer is connected to a computer.
2. Verify that paper is loaded.
3. Verify that the ribbon and printhead are correctly installed.
4. Power OFF the printer.
5. Press and hold the SELECT and TOF/PARK buttons while powering ON the printer.
6. All data sent to the printer, including text and printer commands, will print in both hexadecimal and ASCII format. In the ASCII format, all non-printable codes will be represented by a period.
7. To return to normal printing, power OFF the printer. Then, power ON.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 109
4.9 RESISTANCE CHECKS
4.9.01 General Description
The charts on the following pages provide information needed to determine if the printhead and motors used in the printer are defective.
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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 110
4.9.02 Main Control Board (UMMB) Voltage Check Points
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4.9.03 Connectors Block Diagram
Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 111
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4.9.04 Connector Location
Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 112
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4.9.05 Resistance Diagrams
Printhead
Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 113
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Space and Line Feed Motors
Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 114
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4.9.06 Head Cable Connection
Service Guide ML380
Chapter 4 Failure & Repair Analysis
Page: 115
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Page: 116
Service Guide ML380
Chapter A Board Diagrams
A.1 OVERVIEW
A.1.01 General Information
This section describes the characteristics of the printed circuit boards used in the printer.
The following areas are covered.
Firmware
Fuses
Jumpers
Sensors
Switches
Test Points
Where an item is not applicable, the word
NONE
will be listed.
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Page: 117
Service Guide ML380
Chapter A Board Diagrams
A.2 INDEX TO CHARTS
Description
Main Control Board (Original)
Main Control Board (Current)
RS-232C Serial Module
Board Designation
UMMB
UMMB
UMRS
Section
A.2.01
A.2.02
A.2.03
Modifications to Main Control Board (UMMB)
There are two types of UMMB boards that you might encounter when servicing the Microline 380 printer.
Summary - UMMB: Original Board
The original board (refer to A.2.01) contains the following PROM/ ROM combination:
Q2 - contains a 256 K or a 512 K PROM in a socket. This PROM contains the printer control firmware.
Q3 - is a character generator ROM which is soldered to the printed circuit board.
The original board contains one jumper (SP4). Refer to A.2.01 for jumper placement information.
Summary - UMMB: Current Board
The current board
(refer to A.2.02
)
contains the following PROM/ ROM combination:
Q2 - contains a 1 MB MASK PROM in a socket. This PROM contains the printer control firmware and the character generator.
Q3 - is an empty socket. However, if either the 256 K or 512 K PROMS are installed in Q2, a character generator must be installed in Q3.
The current board contains three jumpers (SP4, 6 and 7). Refer to A.2.02 for jumper placement information.
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Service Guide ML380
Chapter A Board Diagrams
A.2.01 Main Control Board (UMMB) Original
Firmware
Q2 - Control Program (PROM)
Q3 - Character Generator (CG ROM) - soldered on the UMMB
Fuses
F1: 2.5 Amp 125V
F2: 1.6 Amp 125V
F1: 3.15 Amp 125V (Power Supply Filter Board)
Jumpers
SP4: Place this jumper on the A Side for both 512K ROM and the 256K ROM
Sensors
NONE
Switches
LED1: Select
LED2: Power
LED3: Fonts
LED4: Fonts
LED5: Fonts
LED6: Character Pitch
LED7: Character Pitch
LED8: Character Pitch
SW1: Select
SW2: Paper Feed
SW3: TOF/Park
Page: 118
SW4: Fonts
SW5: Character Pitch
Test Points
Check the voltages at the testpoints shown
+ 8 vdc (Line Feed, Space Motor, Printer Alarm Circuitry)
+ 35 vdc (Print Wire Drive)
+ 5 vdc (Printer Logic)
Main Control Board (UMMB) Original
Jumper Location
Test Points
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Service Guide ML380
Chapter A Board Diagrams
A.2.02 Main Control Board (UMMB) Current
Firmware
Q2 - Control Program (PROM)
Fuses
F1: 2.5 Amp 125V
F2: 1.6 Amp 125V
F1: 3.15 Amp 125V (Power Supply Filter Board)
Jumpers
SP4: A Side = 1MB/512K ROM in Q2 B Side = 256K ROM in Q2
SP6: A Side = 256K/512K ROM in Q2 B Side = 1 MB Mask ROM in Q2
SP7: A Side = 256K/512K ROM in Q2 B Side = 1 MB Mask ROM in Q2
Sensors
NONE
Switches
LED1: Select
LED2: Power
LED3: Fonts
LED4: Fonts
LED5: Fonts
LED6: Character Pitch
LED7: Character Pitch
LED8: Character Pitch
SW1: Select
SW2: Paper Feed
Page: 119
SW3: TOF/Park
SW4: Fonts
SW5: Character Pitch
Test Points
Check the voltages at the testpoints shown
+ 8 vdc (Line Feed, Space Motor, Printer Alarm Circuitry)
+ 35 vdc (Print Wire Drive)
+ 5 vdc (Printer Logic)
Main Control Board (UMMB) Current
Jumper Location
Test Points
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Service Guide ML380
Chapter A Board Diagrams
A.2.03 RS232-C Serial Module (UMRS)
Firmware
Q3 - Control Program PROM
Fuses
NONE
Jumpers
SP1
Side 1+ 2 = External ROM
Side 2+ 3 = Internal ROM
Sensors
NONE
Switches
NONE
Testpoints
CN1, Pin 18 (see diagram)
+ 5 vdc
Q4, Pin 14
+ 9 vdc
Q4, Pin 16
- 9 vdc
NOTES:
Check on solder side of board with cover removed. Be careful not to damage any components when cover is removed.
Instructions for running the Serial Loopback Diagnostic are contained in the Printer Handbook,
Appendix D. Construct a loopback connector as shown using a DB-25-M connector.
Page: 120
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Service Guide ML380
Chapter B Illustrated Parts Listing
B.1 OVERVIEW
B.1.01 General Information
This appendix will assist you in identifying the assemblies and parts of the product.
Use Section Four (Failure Analysis) to determine the defective part(s).
Locate the part and its part number in this section.
Appendix B is cross-referenced to Section Three (Maintenance).
Format
The format for this appendix is a series of tables with diagrams. The tables contain the item reference number, the Okidata and Oki-Japan (Oki-J) part numbers, the part description, a comments section, and the disassembly procedure.
Page: 121
Items with the comments RSPL (Recommended Spare Parts List), Consumable, Document, or Option are available from Okidata. Items without these comments are usually not stocked.
Some items are only available as assemblies. Every effort has been made to clearly indicate which items are in assemblies and which are not.
N/A will appear where a part number is not available
Current Part Numbers
Okidata has made every effort to include current part numbers in this Service Handbook
at the time of publishing
.
However, technical information frequently changes. These changes often include new or modified parts, with new or modified part numbers.
Please refer to the following resources for current part numbers and pricing.
· Okidata's Electronic Bulletin Board (Okilink II) contains current part numbers, prices, and recommended stocking levels for each item listed as a recommended spare part. For instructions on accessing Okilink II, refer to the Service Center Reference Guide.
· Okidata's Faxable Facts is an automated fax document retrieval system. Part numbers and pricing are available through Faxable Facts. For instructions on accessing Faxable Facts, refer to the Service Center
Reference Guide.
· Okidata's Technical Information Group is a telephone support line reserved for Authorized Dealers. Part numbers and pricing are available through Technical Information. For instructions on accessing Technical
Information, refer to the Service Center Reference Guide.
REMEMBER
Current part numbers, recommended stocking levels, and pricing information are available through Okilink
II, Faxable Facts, and Technical Information. Refer to the Service Center Reference Guide for information on accessing these resources.
.
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Service Guide ML380
Chapter B Illustrated Parts Listing
B.1.02 Definition of Terms
Assemblies
Assemblies are parts grouped under a single description and/or part number. Generally, individual items in an assembly are not available from Okidata.
Assemblies are surrounded by broken line boxes in the diagrams.
Assemblies will say "Includes xx xx" under the
Comments
section of the tables.
Parts in assemblies will say "Part of xx" under the
Comments
section of the tables.
Blank
Okidata does not recommend stocking this item. This item should be purchased on an As
Required Basis
only
.
The availability of this item is
NOT
guaranteed by Okidata.
Consumable
A consumable is a supply item which has a specified life and must be periodically replaced. It is purchased and installed by the end user. Okidata machines are designed to work
exclusively
with Okidata consumables. By using genuine Okidata consumable products, the investment made in the equipment is protected.
Document
A document is a printed item which supports the service and marketing of a product. Various documents are available from Okidata.
Drivers
Printer drivers are updated frequently. Please refer to Okilink II for the latest printer driver information.
Firmware
Firmware is revised frequently. Please refer to Okilink II for the latest firmware information.
Option
An option is a part/assembly which is added to a product. The option expands the products functionality.
An option may or may not be installed by the end user. Instructions for installation accompany each option.
Option RSPL
Okidata recommends that this part/assembly be on hand for servicing installed options.
RSPL
Okidata recommends that this part/assembly be on hand for servicing.
Technical Service Bulletins
Technical Service Bulletins (TSBs) are also referred to as Okidata's monthly mail.
The TSBs contain the latest information on firmware revisions, procedure changes, and technical information updates.
Okidata distributes the TSBs through Okilink II. The TSBs are issued monthly.
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Page: 123
Service Guide ML380
Chapter B Illustrated Parts Listing
B.1.03 Parts Ordering Information
Service Center Reference Guide
When a technician has successfully completed a Service Training Course for a product and the
Dealer has become Service Authorized, an information package is provided to the Dealer. The
Okidata Service Center Reference Guide outlines the following items.
· Responsibilities of Okidata Service Centers
· Spare parts and consumables information
· Procedures for warranty repairs
· Product Training, Certification, and Authorization
· Product Support information
· Okidata Depot information and services
· Third Party Service information
· Information about Okidata's Customer Information Center
· Okidata Service and Support telephone numbers.
The Service Center Reference Guide contains the procedures to follow for ordering parts. Please
read
,
understand
, and
follow
these procedures. Service Authorization for a specific product
must
be obtained before a Dealer can submit warranty claims.
Direct questions regarding the Service Center Reference Guide to Okidata Dealer Service. Refer to the
Service Center Reference Guide for information on contacting Okidata.
Placing a Parts Order
All authorized Okidata resellers may order spare parts and consumables for Okidata products. Orders are placed through Okidata's Logistics Department.
Please refer to your Service Center Reference Guide for details on ordering parts.
You should have the following information available
before
you place your order.
· Okidata Dealer Authorization Number
· Okidata Customer Number
· Your Purchase Order Number
· Okidata Part Number(s)
Use this Appendix, Okilink II, Faxable Facts, or contact Okidata Technical Support to find the correct part number. Refer to the Service Center Reference Guide for information on contacting Okidata.
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Service Guide ML380
Chapter B Illustrated Parts Listing
B.2 CHARTS
Below is an index to the illustrated parts breakdown charts.
Description
Printer
Covers
Printer Unit
Printer Mechanism (1 of 3)
Printer Mechanism (2 of 3)
Printer Mechanism (3 of 3)
Option Parts
Consumables
Packaging
Documentation
Service Training Kit Revisions
Section
B.2.01
B.2.02
B.2.03
B.2.04
B.2.05
B.2.06
B.2.07
B.2.08
B.2.09
B.2.10
B.2.11
Page: 124
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Page: 125
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.01 Printer
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item Okidata P/N
Oki-J P/N
1 62407901 N/A
2 62407902 N/A
Description
Printer: ML380
Parallel (120V)
Epson/LQ Comp.
Printer: ML380
Parallel (220V)
Epson/LQ Comp.
Comments
Refer to B.1.02
Refer to B.1.02
Disassembly
Procedure
N/A
N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 126
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.02 Covers
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
5
6
7
8
2
3
4
9
10
11
Item
1
Okidata P/N
Oki-J P/N
50071101
2PA4094-1078G1
50071201
1PP4094-1079P1
53510201
1PP4094-1080P1
53510401
2PP4094-1082P1
53510301
2PP4094-1081P1
53510101
1PP4094-1077P1
53510001
1PP4094-1076P1
54148708
+T2P3-8-HHC
53330101
2PP4094-1085P1
53510601
1PP4094-1074P1
53452701
4PB4025-1137P1
Description
Separator: Sheet
(Assembly)
Separator: Sheet
Support: Sheet
Guide: Sheet (L)
Guide: Sheet (R)
Cover: Access
Cover: Middle RSPL
Screw: No. 3 x 8 MM
Self Tapping
Plate: Shield
RSPL
RSPL
Cover: Lower
Foot: Rubber
RSPL
RSPL
Comments
Refer to B.1.02
RSPL Inc. 2 - 4
RSPL
3.2.03
3.2.03
3.2.03
3.2.20
3.2.20
3.2.20
3.2.20
Disassembly
Procedure
3.2.03
3.2.03
3.2.03
3.2.03
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 127
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.03 Printer Unit
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
1
2
3
4
5
6
7
8
9
10
11
11
12
12
Okidata P/N Oki-J
P/N
N/A
3YS4011-1187P1
53511401
2PP4043-3688P1
50079301
4YA4023-2011G2
51901101
3PP4025-2871P1
55047801
4YA4042-1450G11
55938501
816A0326M0000
56304201
540A2046M1162
56304301
540A2046M1252
53524301
3PP4043-3783G1
50071301
1PA4094-1073G1
56408201
4YB4049-1482P1
56408301
4YB4049-1498P1
56304101
540A2046M1322
56304501
540A2058T2132
Description
AC Cable
Separator: Paper
Printhead
Knob: Platen
PCB: UMMB (Main
Control) w/o ROM
IC: EEPROM
BR93CS46-Z-NW
Fuse: 125V 1.6A
Fuse: 125V 2.5A
Sheet: Operation
Panel
Cover: Lower
(Assembly)
Power Supply Unit
120V
Power Supply Unit
220/240V
Fuse: 125V 3.15A
Fuse: 250V 1.25A
Comments
Refer to B.1.02
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
3.2.20
3.2.21
3.2.21
3.2.21
3.2.21
3.2.08
3.2.08
3.2.08
3.2.08
3.2.09
Disassembly
Procedure
3.2.01
3.2.01
3.2.02
3.2.03
Page: 128
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.04 Printer Mechanism (1 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
5
6
7
3
4
1
2
14
15
16
12
13
17
10
11
8
9
Item Okidata P/N
Oki-J P/N
53510801
3PP4043-3755P1
50904801
LB-193000-1
N/A
4PP4050-2621P1
51219201
3PP4043-3683P1
53330301
4PP4043-3756G1
56507801
3PB4043-3772P1
56106901
4YX4043-3781G1
50911801
4PB4025-2843P1
53511001
2PP4043-3696P1
50911701
4PB4025-2842P1
53511101
3PP4043-3697P1
51110501
4PB4043-3809P1
51606501
4PP4043-3684P1
51606601
4PP4043-3685P1
53510701
3PP4043-3687P1
51110401
4PP4043-3769P1
50704601
4PP4043-3686P1
Description Comments
Refer to B.1.02
Disassembly
Procedure
Rack: Space
Spring: Coil
RSPL
RSPL
Screw: Self Tapping
Pulley: Idle RSPL
Bracket: Idle Pulley
Motor: Line Feed
RSPL
RSPL
Photosensor:
(Assembly) Paper
End
Spring: Bail Arm (L)
Bail Arm (L)
RSPL
RSPL
RSPL
Spring: Bail Arm (R) RSPL
Bail Arm (R) RSPL
Shaft: Indicator
(Assembly) Bail Bar
Bushing: Adjust (L)
RSPL
RSPL
Bushing: Adjust (R)
Lever: Adjust
Shaft: Carriage
Collar: Eccentric
RSPL
RSPL
RSPL
RSPL
3.2.04
3.2.06
3.2.06
3.2.06
3.2.06
3.2.10
3.2.11
3.2.12
3.2.12
3.2.12
3.2.12
3.2.12
3.2.13
3.2.13
3.2.13
3.2.13
3.2.13
18
19
N/A
4YS4011-1607G2
50061305
3PA4025-2811G5
Code: Earth
Platen: (Assembly) RSPL
3.2.13
3.2.14
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 129
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.05 Printer Mechanism (2 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
13
14
Item
10
11 A
11 B
7
8
9
1
2
3
4
5
6
12
Okidata P/N
Oki-J P/N
50071701
3PA4043-3777G1
53511201
3PP4043-3703P1
51219101
4PP4043-3705P1
50915101
4PP4043-3782P1
58227501
N/A
51216001
4PP4025-2868P1
53511301
3PP4043-3704P1
50071601
3PA4043-3773G1
50911501
3PP4025-2819P1
51216101
4PP4025-2869P1
56211301
4YX4043-3780G1
56211301
4YX4043-3780G1
50071401
2PA4043-3751G1
56507901
3PB4043-3762P1
53510901
3PP4043-3690P1
Description
Chute: Paper
(Assembly)
Lever: Release
Gear: Change
Spring: Change
Gear
Kit: Idler/Change
Gear (ML300)
Gear: Idler
Comments
Refer to B.1.02
RSPL
RSPL
RSPL
RSPL
RSPL Inc. 6
Link: Release
Roller: Pressure
(Assembly)
Guide: Paper
Pressure
Gear: Tractor
RSPL
RSPL
RSPL
RSPL
Microswitch:
(Assembly) SASF
Microswitch:
(Assembly) Home
Position
Chassis:
Mechanism
(Assembly)
Motor: Space
(Assembly)
Lever: Bottom
Paper Guide
RSPL
RSPL
RSPL
RSPL
RSPL
3.2.15
3.2.15
3.2.15
3.2.15
3.2.16
Disassembly
Procedure
3.2.15
3.2.15
3.2.15
3.2.15
3.2.17
3.2.18
3.2.19
3.2.20
3.2.22
3.2.23
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 130
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.06 Printer Mechanism (3 of 3)
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item Okidata P/N
Oki-J P/N
Description Comments
Refer to B.1.02
Disassembly
Procedure
4
5
6
1
2
3
7
8
9
10
13
14
11
12
50071501
4PA4043-3767G1
51304001
4PB4043-3759P1
51004001
4PP4043-3768P1
53330401
2PP4043-3801P1
50704701
4PP4043-3802P1
56725301
3PB4043-3766P1
50702901
4PP4025-1048P1
53056201
3PP4025-2836P1
53330201
4PP4043-3764G1
50071901
4PA4043-3779G1
51003901
4PP4043-3741P1
50071801
4PA4043-3778G1
51109503
4PB4043-3865P1
51110601
4PP4043-3784P1
Gear: Ribbon Feed
(Assembly)
Belt: Mini-Pitch
(Space Belt)
Slider
RSPL
RSPL
RSPL
Plate: Carriage
Clamp: Belt
Connector: Head
(Assembly) Head
Cable
Clamp: Head
RSPL
RSPL
RSPL
RSPL
Protector: Ribbon
Frame: Carriage
Tractor: Pin [L]
(Assembly)
Guide: Center
Tractor: Pin [R]
(Assembly)
Shaft: Drive
Shaft: Lock
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
RSPL
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
3.2.17
3.2.17
3.2.17
3.2.17
3.2.13
3.2.13
3.2.13
3.2.17
3.2.05
3.2.06
3.2.06
3.2.06
3.2.06
3.2.07
Page: 131
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.07 Option Parts
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item Okidata P/N
Oki-J P/N
Description Comments Refer to
B.1.02
Disassembly
Procedure
3
4
5
6
1
2
7
8
9
10
70000803
70016001
70016101
N/A
4YA4042-1451G1
53511601
2PP4043-3718P1
55047901
4YA4042-1451G11
53511501
2PP4043-3717P1
70015901
50072001
3PA4025-2971G1
53510501
1PP4094-1084P1
Kit: IBM PC Cable
Kit for Parallel
Printers
Kit: Cut Sheet
Feeder 3800 Single
Bin (ML380)
Kit: Super Speed
RS-232C (ML380)
Module: Interface
(RS232C)
Cover: Upper
(RS232C I/F)
PCB: UMRS
(RS232C I/F) w/o
ROM
Cover: Lower
(RS232C I/F)
Kit: Pull Tractor
(ML380)
Unit: Tractor
Option
Option
Option Incl 4 5 6 7 N/A
Option Inc. 5 6 7
Option RSPL Part of
4
Option RSPL Part of
4
Option RSPL Part of
4
Option Inc 9 and 10
Option Part of 8
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Cover: Tractor Option Part of 8 N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 132
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.08 Consumables
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
1
Okidata P/N
Oki-J P/N
52104001
N/A
Description
Ribbon:
Cartridge
Comments
Refer to B.1.02
Consumable
Disassembly
Procedure
3.2.02
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 133
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.09 Packaging
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
1
Okidata P/N
Oki-J P/N
53506702
N/A
Description
Box: Graphic
(Microline 380)
Comments
Refer to B.1.02
Disassembly
Procedure
N/A
2
3
4
5
53529702
N/A
53529701
N/A
N/A
N/A
N/A
N/A
Foam: End Cap
(Left)
Foam: End Cap
(Right)
Bag: Printer
Bag: Accessories
N/A
N/A
N/A
N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 134
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.10 Documentation
Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Item
1#
1#
1#
2
3
4
5
6
6
6
7
8
9
Okidata P/N
Oki-J P/N
58217701
N/A
58217702
N/A
58217703
N/A
58232301
N/A
52033001
N/A
53436029
N/A
58052101
N/A
59235901
N/A
59235902
N/A
59235903
N/A
59236401
N/A
59236501
N/A
59238401
10 58054901
N/A
Description
Kit: ML380 Service
Training
Kit: ML380 Service
Training
Kit: ML380 Service
Training
Package: User's
Documentation
Card: QA Reply
Bag: Poly 9" x 12"
Guide: Customer
Service
Handbook: Printer
Handbook: Printer
Handbook: Printer
Manual:
Maintenance
Manual:
Troubleshooting
Manual:
Maintenance CSF
3800
Product
Specifications
Comments
Refer to B.1.02
Document
Document
Document
Document Inc. 3 4 5
6
Document Part of 2
Document Part of 2
Document Part of 2
Document Part of 2
Document Part of 2
Document Part of 2
Document
Document
Document
Document
Disassembly
Procedure
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
11
12
59239101
59239001
Product
Specifications ML380
Serial Interface
Document
Product
Specifications ML380
CSF 3800
Document
N/A
N/A
* To order Marketing Literature, complete an Okidata Marketing Literature Order Form. Fax the completed form to Okidata Marketing Communications.
* * Obtain this form by faxing a request to Okidata Marketing Communications. Refer to the Service
Center Reference Guide for information on contacting Okidata.
Item
13
14
15
16
17
18
19
20
21
22 *
23 *
*
Okidata P/N
Oki-J P/N
N/A
N/A
53547501
N/A
58067201
N/A
58052401
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Description
Okidata Service
Center Reference
Guide
Okidata Support
3-Ring Binder
ABCD Warranty
Claim Forms (Pkg of
20)
Warranty Summary
Forms (Pkg of 20)
Printer Drivers
Comments
Refer to B.1.02
Document
Document
Document
Document
Refer to Okilink
Product Updates
Recommended
Spare Parts List
Software
Technical Service
Bulletins
Marketing Literature
Okidata Marketing
Literature Order
Form
Document Refer to
Okilink
Document Refer to
Okilink
Refer to Okilink
Document Refer to
Okilink
Document
Document
Disassembly
Procedure
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
* To order Marketing Literature, complete an Okidata Marketing Literature Order Form. Fax the completed
form to Okidata Marketing Communications.
* * Obtain this form by faxing a request to Okidata Marketing Communications. Refer to the Service
Center Reference Guide for information on contacting Okidata.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 135
Service Guide ML380
Chapter B Illustrated Parts Listing
B.2.11 Service Training Kit Revision List
P/N 58217701 Microline 380 Service Training Kit
This kit was replaced by P/N 58217702.
Items in the training kit (except for the Printer Handbook) are NOT available separately.
Item
1 A
2 A
3 A
4 A
5 A
6 A
7 A
8 A
9 A
10 A
11 A
12 A
Okidata P/N
Oki-J P/N
58217701
N/A
52046201
N/A
58055201
N/A
59238901
N/A
59238701
N/A
59235901
N/A
59238801
N/A
52046202
N/A
52046202
N/A
52046202
N/A
57517101
N/A
53533001
N/A
Description
Sheet: Cover Letter
Guide: Study
Manual: Training
Handbook: Printer
Service Videotape
Label: Service
Videotape Case
Label: Service
Videotape Front
Label: Service
Videotape Spine
Red Vinyl Case
(VHS Videotape)
Storage Box
P/N 58217702 Microline 380 Service Training Kit
Comments
Refer to B.1.02
Document Kit: ML380 Service
Training
Label: Kit Document
Document
Document
Document
Document
Document
Document
Document
Document
Document
Document
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Disassembly
Procedure
N/A
N/A
N/A
N/A
This kit was replaced by P/N 58217703.
Items in the training kit (except for the Printer Handbook) are NOT available separately.
Item
1 B
Okidata P/N Oki-J
P/N
58217702 N/A
2 B
Description
Kit: ML380 Service
Training
Label: Kit
3 B
52046201 Rev B
N/A
58055202 N/A
4 B
5 B
6 B
59238702 N/A
59261901 N/A
59235903 N/A
Sheet: Read Me
First
Handbook: Service
User's
Documentation
Handbook: Printer
Comments
Refer to B.1.02
Document
Document
Document
Document
Document
Document
P/N 58217703 Microline 380 Service Training Kit
This kit replaces P/N 58217702.
Items in the training kit (except for the Printer Handbook) are NOT available separately.
N/A
N/A
N/A
N/A
Disassembly
Procedure
N/A
N/A
Item
1 B
2 B
3 B
4 B
5 B
Okidata P/N
Oki-J P/N
58217703
N/A
52046203
N/A
58055203
N/A
59238703
N/A
59235903
N/A
Description
Kit: ML380 Service
Training
Label: Kit
Sheet: Read Me First
Handbook: Service
Handbook: Printer
Comments
Refer to B.1.02
Document
Document
Document
Document
Document
N/A
N/A
N/A
Disassembly
Procedure
N/A
N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Advertisement
Key features
- 80 column impact dot matrix printer
- 24-pin printhead
- Epson LQ emulation
- Standard push tractor
- Optional pull tractor
- Font and character pitch selection
- Centronics Parallel interface
- Optional RS232-C interface module