Okidata OKIJET 2020 Service Manual
Front Cover
Service Manual - OKIJET 2020
Chapter 0 Introduction
OKIJET 2020
INK JET PRINTER PRODUCTS
P/ N 59276601
Adobe Acrobat printable reference copy
of the OKIDATA Service Training Manual.
03/20/98
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 display well
on most displays.
OKIDATA has taken care to insure that the information is complete, accurate and up-to-date. However, OKIDATA assumes no
responsibility for errors or omissions which may occur. All the information provided is subject to change from time to time at the
sole discretion of OKIDATA.
Table of Contents Page
Service Manual - OKIJET 2020
0 Introduction
Disclaimer/Copyright 1
About This Manual 2
Organization 3
....Section 1 - SERVICE CALL PROCEDURES 4
....Section 2 - REPAIR ANALYSIS PROCEDURES (RAPs) 5
....Section 3 - IMAGE QUALITY REPAIR ANALYSIS
PROCEDURES (RAPs)
....Section 4 - REPAIR / ADJUSTMENT PROCEDURES 7
....Section 5 - PARTS LIST 8
....Section 6 - GENERAL PROCEDURES 9
....Section 7 - WIRING DATA 10
How To Use This Manual 11
Reference Symbology 12
Special Symbols 13
Signal Nomenclature 14
DC Voltage Levels 15
Switches and Relay Contacts 16
1 Service Call Procedures
Introduction 17
....Printer Maintenance 18
....Initial Actions 19
....System Checkout / Final Action 20
2 Repair Analysis Procedures (RAPs)
Error LED On RAP 21
Power LED Blinking RAP 22
Low Ink LED(s) On RAP 23
Error LED Flashing RAP 24
1.1 Power on RAP 25
2.1 Selection/Indication RAP 26
6.1 Carriage TAP 27
6.2 Encoder RAP 28
8.1 Paper Feed RAP 29
9.1 Blank Print RAP 30
3 Image Quality RAPs
IQ 1 Image Defect Entry RAP 31
IQ 1 Image Defect Entry RAP Table 32
4 Repair / Adjustment Procedures
REP 1.0 Printhead 33
REP 1.1 Paper Tray Assembly 34
REP 1.2 Cartridge Cover 35
REP 1.3 Top Cover 36
6
Table of Contents Page
REP 1.4 Exit Guide 37
REP 1.5 Paper Feed / Carriage Assy. 38
REP 1.6 Power Supply 39
REP 1.7 Main Control Board 40
REP 1.8 Waste Ink Pad 41
REP 1.9 Pump 42
REP 1.10 Maintenance Station 43
REP 1.11 Encoder 44
REP 1.12 Control Panel Assembly 45
REP 1.13 Paper Path Sensor (SW 1) 46
REP 1.14 Back Pad 47
REP 1.15 Printhead Ribbon Cable 48
REP 1.16 Ink Level Sensor 49
ADJ 2.0 Printhead Alignment 50
5 Parts List
PL 1.1 Printer Components 51
PL 2.1 Paper Feed / Carriage Assembly Components (Part 1 of3)52
PL 2.1 Paper Feed / Carriage Assembly Components (Part 2 of3)53
PL 2.1 Paper Feed / Carriage Assembly Components (Part 3 of3)54
Part Number Index 55
6 General Procedures
Diagnostics 56
....GP 1 Printhead Test 57
....GP 2 Printing with DOS 58
Product Specifications 59
....Physical Characteristics 60
....Electrical Requirements 61
....Printer Capabilities 62
....Supplemental Items 63
Printer Overview and Technical Overview Introduction 64
....Printer Overview 65
........Printer Specifications 66
........Features and Operation 67
........Safety Notes 68
........Printer Installation 69
....Printer Operation 70
........Loading the paper 71
........Test print mode 72
........Connecting the printer to a computer 73
........Control panel 74
........Printing 75
Table of Contents Page
....Printer Maintenance 76
........Cleaning 77
........Replacing the Printhead 78
........Troubleshooting 79
........Removal / Replacement of the printer components 80
Technical Overview 81
....Power and Control 82
........Standby power 83
........Run control functions 84
........Main Control Board 85
........Control Panel Assembly 86
........Bi-Directional Cable 87
....Printing and Priming 88
........Printing 89
........Print control 90
........Cleaning and Priming 91
....Ink Level Sensing 92
........Ink Cartridge Present 93
........Low Ink Detection 94
........Out of Ink Detection 95
....Carriage Drive 96
........Carriage drive 97
........Carriage movement at power on 98
....Encoder 99
........Status code 100
....Paper Supply / Paper Feed 101
........Paper supply 102
........Paper feed 103
........Load and eject mechanism 104
....Sensors and status indicators 105
........Sensors 106
........Status indicators 107
7 Wiring Data
Plug / Jack Location Index 108
Plug / Jack Location Drawings 109
....Figure 7-1. Main Control Board and Power Supply 110
....Figure 7-2. Carriage Assembly (Bottom View) 111
....Figure 7-3. Carriage 112
....Figure 7-4. Front View 113
Block Schematic Diagrams (BSDs) 114
....Chain 1 AC/DC Power Generation 115
....Chain 2 Selection and Indication 116
....Chain 3 Machine Run Control 117
....Chain 8 Paper Feed 118
Table of Contents Page
....Chain 9 Print Control 119
Page: 1
Service Manual - OKIJET 2020
Chapter 0 Introduction
Disclaimer/Copyright
Disclaimer
This document may not be reproduced without the written permission of Okidata Training and
Publications. 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.
Copyright 1997 by Okidata
All rights reserved.
Edited by:
Okidata Training and Publications
Prepared by:
Multinational Customer and Service Education
Xerox Corporation, Rochester, New York 14644
Please address any comments on this publication to:
Mailing Address:
OKIDATA Training and Publications
532 Fellowship Road
Mt. Laurel, NJ 08054-3499
Web Site
Telephone 609- 235- 2600
Facsimile 609- 222- 5320
Okilink Technical Training
Copyright Listing
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.
XEROX is a trademark of Xerox Corporation
Notice
All service documentation is supplied for informational purposes only. Okidata service documentation is
intended for use by certified, product trained service personnel only. Okidata does not warrant or
represent that such documentation is complete, nor does Okidata represent or warrant that it will notify or
provide to such customer any future changes to this documentation. Customer performed service of
equipment, or modules, components or parts of such equipment may affect the warranty offered by
Okidata with respect to such equipment. You should consult the applicable warranty for its terms
regarding customer or third party provided service. If the customer services such equipment, modules,
www.okidata.com
components or parts thereof, the customer releases Okidata from any and all liability for the customer
actions, and the customer agrees to indemnify, defend and hold Okidata harmless from any third party
claims which arise directly or indirectly from such service.
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: 2
Service Manual - OKIJET 2020
Chapter 0 Introduction
About This Manual
This manual contains Repair Analysis Procedures, Repair Procedures, Adjustment Procedures, Parts
List, Diagnostic Procedures, and Wiring Data information that will enable a Service Representative to
repair the Printer.
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 Manual - OKIJET 2020
Chapter 0 Introduction
Organization
This manual is divided into seven sections. The title and description of each section are listed below.
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any updates to this material. (http://bpx.okidata.com)
Page: 4
Service Manual - OKIJET 2020
Chapter 0 Introduction
Section 1 - SERVICE CALL PROCEDURES
This section contains the following:
Initial Actions / System Checks
System Checkout
Final Action
Initial Actions / System Checks
This diagram identifies how to collect the data necessary to decide how to proceed with the service call. It
classifies the problem and refers you to the appropriate Repair Analysis Procedure.
System Checkout
The System Checkout procedure is used to verify that the printer is operating properly after a repair has
been made.
Final Action
The Final Action procedure identifies the steps that must be performed before finishing the repair.
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: 5
Service Manual - OKIJET 2020
Chapter 0 Introduction
Section 2 - REPAIR ANALYSIS PROCEDURES (RAPs)
This section contains the Repair Analysis Procedures (RAPs) necessary to repair faults. When using a
RAP, always exit the procedure when the fault is fixed. Do not perform the remaining steps.
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: 6
Service Manual - OKIJET 2020
Chapter 0 Introduction
Section 3 - IMAGE QUALITY REPAIR ANALYSIS PROCEDURES (RAPs)
This section contains the Repair Analysis Procedures (RAPs) necessary to repair print quality faults. The
first RAP, IQ 1 Image Defect Entry RAP, is used to classify a print quality problem and will reference the
RAP to be used to repair the problem. When using a RAP, exit the procedure when the fault is fixed. Do
not perform the remaining steps.
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: 7
Service Manual - OKIJET 2020
Chapter 0 Introduction
Section 4 - REPAIR / ADJUSTMENT PROCEDURES
This section contains the repair and adjustment procedures for the printer.
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any updates to this material. (http://bpx.okidata.com)
Page: 8
Service Manual - OKIJET 2020
Chapter 0 Introduction
Section 5 - PARTS LIST
This section contains the detailed Parts List for the printer.
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: 9
Service Manual - OKIJET 2020
Chapter 0 Introduction
Section 6 - GENERAL PROCEDURES
This section contains Diagnostic Procedures and Product Specifications for the Printer. An Overview and
Technical Overview section are also included.
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any updates to this material. (http://bpx.okidata.com)
Page: 10
Service Manual - OKIJET 2020
Chapter 0 Introduction
Section 7 - WIRING DATA
This section contains Plug/ Jack Location Drawings and Block Schematic Diagrams (BSDs).
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: 11
Service Manual - OKIJET 2020
Chapter 0 Introduction
How To Use This Manual
The Service Call Procedures will direct you to the proper section of the Service Manual.
You should begin the service call with the Initial Actions / System Checks Procedure. From there, you will
be referenced to either Section 2, Status Indicator RAPs or Section 3, Image Quality RAPs.
If you are sent to Section 3, you will perform the IQ 1 Image Defect Entry RAP to classify the print quality
problem. You will then be directed to the proper RAP to begin your troubleshooting. From these RAPs
you may be referenced to other sections of the manual to make checks, adjustments or to replace parts.
When you have made a repair, return to the System Checkout / Final Action to complete the call.
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: 12
Service Manual - OKIJET 2020
Chapter 0 Introduction
Reference Symbology
Notes, adjustments, and parts lists support the checklists and the RAP information. The symbols that
refer to this supportive data are shown below.
Note
This symbol is used to refer to notes found on the same page.
Adjustments
ADJ 4.1 This symbol refers to an adjustment procedure located in Section 4 of
this Service Manual. The number adjacent to the symbol indicates the number
that is assigned to that adjustment.
Parts List
PL 10.6
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any updates to this material. (http://bpx.okidata.com)
Refers to the parts list located in Section 5 of this Service Manual. The number
after the PL designation indicates the number that is assigned to that part.
Page: 13
Service Manual - OKIJET 2020
Chapter 0 Introduction
Special Symbols
Descriptions of all commonly used graphic symbols are included in order to aid in troubleshooting when
using the RAPs.
Interrupt Horizontal Signal
This indicates the continuation of a signal line which is interrupted in a horizontal
direction.
Standby Power Input
This indicates the continuation of a standby power line which is interrupted in the vertical
direction.
Left to Right Flow
This indicates the direction of signal flow.
Feedback
This indicates a feedback signal.
Flag
This is used to identify an area of a Circuit Diagram that you should check.
Ground
This indicates a machine ground.
LED / Phototransistor Sensor
This type of sensor is used in the paper path. It uses reflected light to switch the sensor
off and on.
Without Tag Change
This signal indicates that the area the triangle points to has not been modified by the tag
number in the circle.
This symbol indicates that the entire page has not been modified by the tag number in
the circle.
With Tag Change
This symbol indicates that the area the triangle points to has been modified by the tag
number in the circle.
This symbol indicates that the entire page has been modified by the tag number in the
circle.
WARNING
A warning is used to alert the personnel to an operating or maintenance
procedure, practice, or condition that, if not strictly observed, could result in injury
or loss of life.
CAUTION
A caution is used to alert the personnel to an operating or maintenance procedure,
practice or condition that, if not strictly observed, could result in damage to, or destruction
of, equipment.
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: 14
Service Manual - OKIJET 2020
Chapter 0 Introduction
Signal Nomenclature
The signal is named to imply the condition of the machine when the signal is available.
For example:
Logic state when the signal is available in its named state. In this case, the signal is LOW when a
document jam is sensed.
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any updates to this material. (http://bpx.okidata.com)
Page: 15
Service Manual - OKIJET 2020
Chapter 0 Introduction
DC Voltage Levels
DC voltages should be measured between the test point and machine GND, unless instructed otherwise.
The table below shows the values of the voltages.
Nominal Voltage
+5 VDC H
+42 VDC H
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any updates to this material. (http://bpx.okidata.com)
Logic State Actual Voltage Ranges
+4.8 to +5.2 VDC
L
L
0.0 to +1.0 VDC
+39.0 to +44.0 VDC
0.0 to +3.0 VDC
Page: 16
Service Manual - OKIJET 2020
Chapter 0 Introduction
Switches and Relay Contacts
Safety interlock switch that is open.
Safety interlock switch that is closed.
Switch or relay contacts with momentary contacts shown normally open.
Switch or relay contacts with momentary contacts shown normally closed.
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any updates to this material. (http://bpx.okidata.com)
Page: 17
Service Manual - OKIJET 2020
Chapter 1 Service Call Procedures
Introduction
Use the Service Call Procedures as a maintenance guide when performing any service on the printer.
Printer Maintenance - This section contains a list of the printer subsystem components to be cleaned
and /or lubricated and the cleaning and lubricating materials to be used, when that subsystem is
accessed during a repair.
Initial Actions / System Checks - This diagram identifies and classifies the printer problem and refers
you to the appropriate RAP in order to repair the problem. When the problem has been repaired,
perform the System Checkout / Final Action.
System Checkout / Final Action - This procedure should be completed at the end of every repair call
to ensure that the printer is operating properly.
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 Manual - OKIJET 2020
Chapter 1 Service Call Procedures
Printer Maintenance
Introduction
When the printer is being serviced, the following maintenance procedure should be performed.
Procedure
Clean the following parts every time the printer is serviced:
Page: 18
Description
Cover Clean using a Lint Free Tissue and water.
Paper Feed Roller Clean using a Lint Free Tissue and water.
Paper Feed Pinch rollers and Paper Feed Guide Clean using a Lint Free Tissue and water.
Maintenance Station Clean using a Lint Free Tissue and water.
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)
Procedure
Service Manual - OKIJET 2020
Chapter 1 Service Call Procedures
Initial Actions
1. QUESTION THE OPERATOR.
2. VERIFY, CLASSIFY AND REPAIR THE PROBLEM.
Page: 19
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any updates to this material. (http://bpx.okidata.com)
Service Manual - OKIJET 2020
Chapter 1 Service Call Procedures
System Checkout / Final Action
Reset the Ink Level Sensing count to zero. Perform the following:
Install a Color Printhead with empty ink cartridges.
Run a Test Print.
Remove the Printhead and install a Color Printhead with full ink cartridges.
Run a Test Print.
The NVM counts are now set to zero.
Print a file.
The Printer prints the selected file.
YN
Refer to Initial Action / System Checks to begin your repair.
Evaluate the print.
Is the image quality acceptable?
YN
Go to the image quality RAP identified by the IQ 1 Image Defect Entry RAP (Section 3).
Page: 20
Print and check the "Printing Alignment Test pattern".
The alignment is good.
YN
Go to the Printhead Alignment Procedure (Section Four).
Clean exterior of machine. Use a lint free tissue and water. Provide a sample of the Test Print.
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 Manual - OKIJET 2020
Chapter 2 Repair Analysis Procedures (RAPs)
Error LED On RAP
Initial Action:
Ensure a color printhead is installed.
Remove the power cord from the printer for 10 seconds, then reinstall it.
Press the Power switch.
The Error LED is on steady.
YN
The Error LED is flashing.
YN
Press and hold the
The Error LED is steady.
YN
The Error LED is flashing.
YN
Resume/FF
Check the interface cable and connectors for an open wire or bad
connection. If OK, replace the Main Control Board.
button for 2 seconds to print the demo print.
Page: 21
Go to Error LED Flashing RAP.
Remove the power cord from the printer for 10 seconds, then reinstall it.
Press and hold the Power switch for about 2 seconds.
The carriage was noisy.
YN
The printhead stopped at each ink cartridge during the power-on cycle.
YN
Go to 6.2 Encoder RAP.
ABCD
Go to 8.1 Paper Feed RAP.
Go to 6.1 Carriage RAP.
Go to Error LED Flashing RAP.
One or more low ink LED(s) are blinking.
YN
Go to 6.1 Carriage RAP.
Go to Low Ink LED(s) on RAP.
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Page: 22
Service Manual - OKIJET 2020
Chapter 2 Repair Analysis Procedures (RAPs)
Power LED Blinking RAP
Remove the power cord from the printer for 10 seconds, the reinstall it.
The Power LED blinks.
YN
Printer is OK.
Go to 2.1 Selection/Indication RAP.
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Service Manual - OKIJET 2020
Chapter 2 Repair Analysis Procedures (RAPs)
Low Ink LED(s) On RAP
Initial Action:
Ensure all the ink cartridges are full and properly seated.
Page: 23
Go to Flags 1 and 2. Check the wires and connections for an open circuit.
YN
Repair the wires or connections if possible.
Replace the main control board.
If the problem still exists, replace the Printer.
Replace the Ink Level Sensor (PL 2.1).
Replace the main control board.
If the problem still exists, replace the printer.
The wires are good.
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)
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