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Okidata Jet 2020 Service Manual


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                                                           Service Manual - OKIJET 2020
                                                                         Chapter 0 Introduction



Front Cover




                                              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        6
       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
   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 of    52
   3)
   PL 2.1 Paper Feed / Carriage Assembly Components (Part 2 of    53
   3)
   PL 2.1 Paper Feed / Carriage Assembly Components (Part 3 of    54
   3)
   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 www.okidata.com

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,
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.

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 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.

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: 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.

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: 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                     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.



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: 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.

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: 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            Logic State           Actual Voltage Ranges
+5 VDC                     H                     +4.8 to +5.2 VDC
                           L                     0.0 to +1.0 VDC
+42 VDC                    H                     +39.0 to +44.0 VDC
                           L                     0.0 to +3.0 VDC


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: 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.


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: 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)
                                                                                                                     Page: 18
                                                          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:


Description                                                 Procedure
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)
                                                                                                                     Page: 19
                                                          Service Manual - OKIJET 2020
                                                               Chapter 1 Service Call Procedures



Initial Actions

1. QUESTION THE OPERATOR.

2. VERIFY, CLASSIFY AND REPAIR THE PROBLEM.




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: 20
                                                          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.
Y N
     Refer to Initial Action / System Checks to begin your repair.

Evaluate the print.
Is the image quality acceptable?
Y N
     Go to the image quality RAP identified by the IQ 1 Image Defect Entry RAP (Section 3).

Print and check the "Printing Alignment Test pattern".
The alignment is good.
Y N 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)
                                                                                                                     Page: 21
                                                          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.
Y      N
       The Error LED is flashing.
       Y     N
             Press and hold the Resume/FF button for 2 seconds to print the demo print.

         The Error LED is steady.
               Y     N
                     The Error LED is flashing.

                          Y        N
                                   Check the interface cable and connectors for an open wire or bad
                                   connection. If OK, replace the Main Control Board.

                          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.
                 Y      N
                        The printhead stopped at each ink cartridge during the power-on cycle.
                        Y     N
                              Go to 6.2 Encoder RAP.

A        B       C        D

                       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.
Y      N
       Go to 6.1 Carriage RAP.
Go to Low Ink LED(s) on RAP.


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: 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.
Y     N
      Printer is OK.

Go to 2.1 Selection/Indication RAP.


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: 23
                                                          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.

Go to Flags 1 and 2. Check the wires and connections for an open circuit. The wires are good.

Y     N
      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.




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: 24
                                                          Service Manual - OKIJET 2020
                                                       Chapter 2 Repair Analysis Procedures (RAPs)



Error LED Flashing RAP

Note: This procedure will work only when the Error LED is flashing.

Note: In the following procedure, the Error LED and Power LED will be used to display an 8 bit binary
error code. The LEDs will flash in 1/2 second intervals. The code will be displayed 4 bits at a time. The
LED code is as follows (See Figure 1):

1 = Both Error and Power LEDs lit

0 = Error LED only is lit

1. Press and release the Resume/ FF button, while observing the Error and Power LEDs.
2. 4 bits will be flashed in 1/ 2 second intervals followed by a pause, then 4 more bits in 1/ 2 second
   intervals. After the cycle, the Error LED will continue to flash.
3. Determine the code and go to the Error Code Chart (Table 1) for the corrective action.
4. Repeat step 1 as many times as necessary to determine the code.




Error Code              Error Description                   Corrective Action
1000 1000               ROM error                           Replace the Main Control Board
1000 1100               RAM error                           Replace the Main Control Board
1100 1000               EPROM error                         Replace the Main Control Board
1110 1000               CPU error                           Replace the Main Control Board
1100 1111               Carriage home position error        Go to 6.1 Carriage RAP


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: 25
                                                Service Manual - OKIJET 2020
                                              Chapter 2 Repair Analysis Procedures (RAPs)



1.1 Power on RAP

Refer to Figure 1. There is +42 VDC measured on the Main Control Board.



Y     N
      Disconnect the power cord.
      Check fuse F1 on the Power
      Supply.
      F1 is blown.
      Y        N
               Go to Flag 1 (Figure 2) and check the wires for an open circuit. If good, replace the Power
               Supply. If problem still exists, replace the Main Control Board.
      Replace the blown fuse.
      If the problem is not corrected, replace the Power Supply (PL 1.1).

Refer to Figure 1. There is +5 VDC measured on the Main Control Board.
Y     N
      Go to Flag 2 and check for a short to ground. If OK, replace the Power Supply. If problem still
      exists, replace Main Control Board.

Replace the Main Control Board before replacing the Control Panel Assembly.
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: 26
                                                 Service Manual - OKIJET 2020
                                               Chapter 2 Repair Analysis Procedures (RAPs)



2.1 Selection/Indication RAP


Load paper.
Disconnect and then reconnect the power cord while observing the LEDs.

All LEDs light momentarily when the power cord is reconnected.
Y     N
      One or more LEDs light.
      Y      N
             Go to 1.1 Power on RAP.

       Go to Flag 1 and Flag 2 and check for an open wire. If OK, replace the Control Panel
       Assembly.


All LEDs go out in approximately 10 seconds.
Y     N
      If the Power LED remains on (flashing), go to Flag 3 and check for an open wire. If OK,
      replace the Control Panel Assembly.

Press and hold the Power button for approximately 2 seconds to turn on the printer.

Press and hold the Resume/FF button for 2 seconds.

Paper feeds.
Y     N
      Go to Flag 5 and check for an open wire.
      If good, go to 8.1 Paper Feed RAP.


A


A
Press the Cartridge Change button.
The carriage moves to the center position.
Y      N
       Go to Flag 4 and check for an open wire.
       If OK, replace the Control Panel Assembly.

For printer set up problems when printing from a DOS application, consult GP 2 Printing with
DOS Procedure in Section 6.

Examples of printer set up problems.

When trying to print from the host, the paper continues to linefeed without outputting any print.
Just a few lines of data are printed and then the paper continues to line feed without printing.




Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for
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                                                                                                                     Page: 27
                                                          Service Manual - OKIJET 2020
                                                       Chapter 2 Repair Analysis Procedures (RAPs)



6.1 Carriage TAP


Disconnect and then reconnect the power cord.
Press and hold the Power switch.
The carriage moves.
Y      N
          Go to Flag 1 and check the ribbon cable for being open or damaged.
          Go to Flag 2 and check for an open circuit. If the wire is good, replace the Main
            Control Board.
          Check / replace the ribbon carriage cable.
          Check the teeth on the belt.
          Check the teeth on the carriage motor.
          Check for 42 volts.
          If 42 volts aren't being supplied by the power supply, replace the power supply.
          Check / replace the carriage motor.

Perform the following:
          Check that the Printhead ribbon cable going to CN4 on the Main Control Board is
            connected properly.
          Go to Flag 2 and Flag 3 and check for an open circuit.
          If the wires are good, replace the Printhead Ribbon Cable (PL 2.1).
          If the problem continues replace the Main Control Board (PL 1.1).
                   Check / replace the ribbon carriage cable.
                   Check the teeth on the belt.
                   Check the teeth on the carriage motor.
                   Check for 42 volts.
                   If 42 volts aren't being supplied by the power supply, replace the power
                      supply.
                   Check / replace the carriage motor.



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                                                                                                                     Page: 28
                                                          Service Manual - OKIJET 2020
                                                       Chapter 2 Repair Analysis Procedures (RAPs)



6.2 Encoder RAP


    Go to Flag 1 and check the ribbon
    Go to Flag 4 and check for an open circuit.
    Replace the Encoder.
    Go to 6.1 Carriage RAP.




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                                                                                                                     Page: 29
                                                          Service Manual - OKIJET 2020
                                                       Chapter 2 Repair Analysis Procedures (RAPs)



8.1 Paper Feed RAP


Clear any paper in the printer.
Disconnect and then reconnect the power cord.
Press and hold the Power switch for about 2 seconds.
Press and hold the Resume/FF button for 2 seconds to print the demo print.
The paper feeds or partially feeds.
Y         N
             Check that the Paper Tray is installed correctly (REP 1.1)
             Go to Flag 1 and check the cam sensor circuit for an open.
             If OK, go to Flag 3 and check for an open circuit. If paper feed motor circuit is
               defective, replace the paper feed motor.
             If the wires are good, replace the Main Control Board.


       Go to Flag 2 and check the paper feed switch circuit for an open.
       If OK, go to Flag 3 and check for an open circuit.
       Replace the Back pad.
       If the problem still exists, replace the Main Control Board.




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                                                                                                                     Page: 30
                                                          Service Manual - OKIJET 2020
                                                       Chapter 2 Repair Analysis Procedures (RAPs)



9.1 Blank Print RAP

Initial Action:

Ensure that the Printhead latch is positioned towards the rear.

Unlatch the Printhead, reset the Printhead and latch it back into position. If problem still exists:

    Replace the Printhead.
    Go to Flag 1 and check the ribbon cable for being damaged.
    Check the terminals of J11 on the Carriage Assembly and J12 on the Ink Cartridge for being
    contaminated or damaged. Clean or repair as necessary.
    If the problem still exists, replace the Printhead Ribbon Cable (PL 2.1).




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                                                                                                                     Page: 31
                                                          Service Manual - OKIJET 2020
                                                                 Chapter 3 Image Quality RAPs



IQ 1 Image Defect Entry RAP

1. Print the Test Print:

a. Load paper into the Paper Tray.

b. Press and hold the Power on / Reset button for approximately 2 seconds and then release, to switch
the Printer power off.

c. While pressing and holding the Resume/ FF button press and release the Power on / Reset button.
The printer prints the test print shown in Figure 1. When the test print is complete, the printer initializes
and returns to the Ready status.

d. If the test print fails to print, repeat steps a through c.

2. Refer to the DEFECT Column in Table 1 that best describes the image quality problem.

3. If the problem is with external input only, replace the Main Control Board.




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                                                                                                                     Page: 32
                                                          Service Manual - OKIJET 2020
                                                                 Chapter 3 Image Quality RAPs



IQ 1 Image Defect Entry RAP Table


         DEFECT                             CAUSE                                    SOLUTION
Blank print                             Printhead                  1. Remove and reinstall the Printhead.
                                                                   2. Press the Cartridge Change / Clean
                                                                        button for 2 seconds to clean and restore
                                                                        the Printhead. Repeat if necessary.
                                                                 If the problem still exists go to the 9.1 Blank
                                                                 Print RAP.
White horizontal lines and              The Printhead            Perform the following:
Streaks                                 nozzles may be             1. Press the Cartridge Change / Clean
                                        blocked.                        button for 2 seconds to clean and restore
                                                                        the Printhead.
                                                                   2. Make another Test Print. If the print still
                                                                        has lines and streaks repeat the above
                                                                        process up to 5 times.
                                                                   3. If the problem still exists, replace the
                                                                        Printhead.
Print is faint or missing            A non                       Replace the paper.
                                     recommended
                                     paper is being used
                                     or the paper is
                                     damp.
                                     Defective Cartridge. Perform the following:
                                     The ink supply may     1. Press and hold the Cartridge Change /
                                     be nearly empty.            Clean button for 2 seconds to clean and
                                     The Printhead               restore the Printhead.
                                     nozzles may be         2. Run a Test Print. If the print is still faint,
                                     blocked.                    repeat the process up to 2 more times.
                                                            3. If the problem is still not corrected
                                                                 replace the Printhead.
Blurry or jagged vertical            Printhead            Perform ADJ 2.0 Printhead Alignment
lines                                Alignment            Procedure
                                                          If the problem still exists switch the printer to
                                                          the High Quality print mode (in the printer
                                                          driver..)
                                     Paper                Turn the paper over to print on the opposite
                                                          side.
Print image is clipped or            Print off edge of    Ensure that the Print Driver setup has the
off edge of media                    media.               correct selection of media size and type.
                                     Document margins Adjust margins in the application as
                                     may exceed printer necessary.
                                     margins.


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                                                                                                Page: 33
                                                  Service Manual - OKIJET 2020
                                                  Chapter 4 Repair / Adjustment Procedures



REP 1.0 Printhead

Parts List on PL 2. 2

Removal

1. Open the Cartridge Cover (PL 1.1).

2. Center the carriage using either of the following procedures:

    Press the Cartridge Change / Clean button.

WARNING: Switch off the power. Disconnect the power cord from the wall outlet.

    Grasp and manually move the belt (PL 2.1) in order to center the Printhead (Figure 1).

CAUTION: Store the Printhead in the Storage Box. Leaving the Printhead removed for long periods of
time will cause the ink nozzles to dry out. Image quality defects or a blank page could result. If
necessary, prime the printhead after reinstallation. (See below to Refer to the Replacement / Priming
section of this procedure.)

3. Move the Printhead lock lever toward the front of the printer.

4. Lift and remove the Printhead. Store it in the Storage Box.

Replacement / Priming

1. Install the Printhead onto the Printhead vertical guide.

2. Move the Printhead lock lever toward the rear of the printer.

3. Close the Cartridge Cover.

4. Press the Resume / FF button to prime the Printhead.

NOTE: The optional high capacity printhead is shown. Refer to the User's Documentation for illustrations
of the standard printhead.
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any updates to this material. (http://bpx.okidata.com)
                                                                                                 Page: 34
                                                    Service Manual - OKIJET 2020
                                                 Chapter 4 Repair / Adjustment Procedures



REP 1.1 Paper Tray Assembly

Parts List on PL 1. 1

Removal

1. Remove the Output Tray (PL 1.1).

2. Press the two handles toward the rear of the printer to release the latches (Figure 1).

3. Pivot the Paper Tray Assembly toward the back of the printer to disengage the three tabs at the bottom
of the Paper Tray Assembly from the tabs on the Paper Feed / Carriage Assembly.

4. Lift the Paper Tray Assembly from the printer.




Replacement

1. Retract the moveable face of the Paper Tray Assembly by pressing it toward the back of the Paper
Tray Assembly.

2. Insert the Paper Tray Assembly into the printer (with bottom of tray touching the bottom of the tray
opening on the printer) ensuring the moveable face is behind the white cam (near the bottom, on the left).
See Figure 2.

3. Engage the three tabs at the bottom of the Paper Tray Assembly with the tabs on the Paper Feed /
Carriage Assembly.

4. Rotate the Paper Tray Assembly toward the front of the printer.

5. Engage the two latches by gently pulling the handles downward and toward the front of the printer until
the latches snap into position.
6. Reinstall the Output Tray.




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any updates to this material. (http://bpx.okidata.com)
                                                                                                                     Page: 35
                                                          Service Manual - OKIJET 2020
                                                          Chapter 4 Repair / Adjustment Procedures



REP 1.2 Cartridge Cover

Parts List on PL 1. 1

Removal

1. Open the Cartridge Cover (PL 1.1).

2. Utilizing a screwdriver or similar tool, slightly separate the Cartridge Cover and Top Cover at either
pivot to release the Cartridge Cover pivot from the Top Cover (Figure 1).

3. Lift the Cartridge Cover from the printer.

Replacement

1. Insert either Cartridge Cover pivot into the corresponding Top Cover pivot hole.

2. Utilizing a screwdriver or similar tool, slightly separate the Cartridge Cover and Top Cover at the
opposite pivot.

3. Position the Cartridge Cover pivot to engage with the pivot hole of the Top Cover.

4. Close the Cartridge Cover.




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any updates to this material. (http://bpx.okidata.com)
                                                                                                       Page: 36
                                                   Service Manual - OKIJET 2020
                                                   Chapter 4 Repair / Adjustment Procedures



REP 1.3 Top Cover

Parts List on PL 1. 1

Removal

CAUTION: Store the Printhead in the Storage Box. Leaving the cartridge removed for long periods of time
will cause the ink nozzles to dry out. Image quality defects or a blank page could result. If necessary,
prime the printhead after
reinstallation. (REP 1.0)

1. Remove the Printhead (REP 1.0). Store the Printhead in the Storage Box.

WARNING: Switch off the power. Disconnect the power cord from the wall outlet.

2. Remove the Output Tray (PL 1.1).

3. Remove the Paper Tray Assembly (REP 1.1).

4. Remove the Cartridge Cover (REP 1.2).

5. Lay the printer on it's back; release the three front latch tabs (Figure 1).

CAUTION: While removing the Top Cover from the printer, take care not to damage the ribbon cable that
is connected to the Control Panel Assembly, which is located inside the Top Cover.

NOTE: The rear of the Top Cover has three locator tabs and two latch tabs.

6. Return the printer to its normal operating position. Lift and hold the front of the cover slightly while
releasing the two rear latch tabs. Then lift the rear of the cover and pivot towards the FRONT of the
printer to remove.

Replacement

1. Ensure the ribbon cable is properly routed and not twisted during Top Cover installation.

2. If previously disconnected, reconnect ribbon cable to the Control Panel Assembly.

3. Position the Top Cover on the printer. Align and latch the rear latches; then the front latches.

4. Reinstall the following:

a. Cartridge Cover (REP 1.2)

b. Paper Tray Assembly (REP 1.1)

c. Output Tray (PL 1.1)
d. Printhead (REP 1.0)




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any updates to this material. (http://bpx.okidata.com)
                                                                                                    Page: 37
                                                  Service Manual - OKIJET 2020
                                                  Chapter 4 Repair / Adjustment Procedures



REP 1.4 Exit Guide

Parts List on PL 2. 2

Removal

CAUTION: Store the Printhead in the Storage Box. Leaving the Printhead removed for long periods of
time will cause the ink nozzles to dry out. Image quality defects or a blank page could result. If necessary,
prime the printhead after reinstallation. (REP 1.0)

1. Remove the Printhead (REP 1.0). Store the Printhead in the Storage Box.

WARNING: Switch off the power. Disconnect the power cord from the wall outlet.

2. Remove the Output Tray (PL 1.1).

3. Remove the Cartridge Cover (REP 1.2).

4. Position both thumbs at the lower, front corners of the Exit Guide (Figure 1). Apply modest pressure
simultaneously toward the rear and up to unlatch the Exit Guide.

5. Rotate the guide approximately 90



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