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Okidata ML 320, 321 Service Manual


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                                                                                                Page: 1
                                               Service Guide ML320/ML321
                                                    Chapter 0 About This Manual




                              ML320/ML321
                            Dot Matrix Printers


                             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                                                 Page

Service Guide ML320/ML321
   0 About This Manual
      Front Cover                                                        1
      Manual Copyright                                                   2
      Manual Part Number and Revision                                    3
   1 Product Specifications
      1.1 General Description                                            4
      ....1.1.02 Serial Number Identification & (A-D) Revision Levels    5
      ........Compatibility Chart                                        6
      1.2 Product Specifications                                         7
      1.3 Paper Specifications                                           8
      1.4 Physical Specifications                                        9
      1.5 Power Requirements                                             10
      1.6 Environmental Requirements                                     11
      1.7 Agency Approvals                                               12
      1.8 Options                                                        13
      1.9 Consumables                                                    14
      1.10 Memory Specifications                                         15
      1.11 Reliability Specifications                                    16
   2 Principles of Operation
      2.1 Printer Overview                                               17
      2.2 Circuit Board Description                                      18
      ....2.2.01 Operator Panel Board                                    19
      ....2.2.02 Power Supply                                            20
      ....2.2.03 Control Board                                           21
      ........Large Scale Integrated Circuitry (LSI)                     22
      2.3 Electrical Operation                                           23
      ....2.3.01 Initialization                                          24
      ....2.3.02 Interface Control                                       25
      ....2.3.03 Print Head Drive Circuit                                26
      ....2.3.04 Spacing Operation                                       27
      ....2.3.05 Line Feed                                               28
      ....2.3.06 Alarm Circuit                                           29
      2.4 Mechanical Principle Of Operation & Block Diagrams             30
      ....2.4.01 Printhead                                               31
      ....2.4.02 Space Mechanism / Operation                             32
      ........Head Gap Adjusting Mechanism                               33
      ....2.4.03 Ribbon Drive Mechanism / Operation                      34
      ....2.4.04 Paper Feed Mechanism                                    35
      ....2.4.05 Paper-End Detection Mechanism                           36
      ....2.4.06 Semi-Automatic Sheet Feeder (SASF) Operation            37
   3 Maintenance & Disassembly
      Maintenance & Disassembly                                          38
   Table of Contents                                            Page
   ....3.1.01 General Information, Tools & Precautions           39
   3.2 Disassembly/Assembly Procedures                           40
   ....3.2.01 Preliminary Items                                  41
   ....3.2.02 Separator Assembly                                 42
   ....3.2.03 Printhead Assembly                                 43
   ....3.2.04 Upper Cover Assembly                               44
   ....3.2.05 Operator Panel Assembly                            45
   ....3.2.06 Control Board (Rev A & B)                          46
   ........Control Board (Rev C)                                 47
   ........Control Board (Rev D)                                 48
   ....3.2.07 IC Card (A) Panel                                  49
   ....3.2.08 Transformer (Rev A & B)                            50
   ........Transformer (Rev C)                                   51
   ........Transformer (Rev D)                                   52
   ....3.2.09 Filter Assembly                                    53
   ....3.2.10 Power Supply Board (Rev A & B)                     54
   ........Power Supply Boards (Rev C)                           55
   3.2.11 Power Interconnect Module / Cable Guide (Rev A & B)    56
   ........Power Interconnect Module / Cable Guide (Rev C)       57
   ........Power Interconnect Module / Cable Guide (Rev D)       58
   ....3.2.12 Indicator Assembly (Bail Bar Assembly)             59
   ....3.2.13 Head Cable Access Cover                            60
   ....3.2.14 Ribbon Drive Assembly                              61
   ....3.2.15 Space Motor Assembly                               62
   ....3.2.16 Carriage Frame Assembly                            63
   ....3.2.17 Space Rack                                         64
   ....3.2.18 Guide Rail                                         65
   ....3.2.19 Platen Assembly                                    66
   ....3.2.20 Line Feed Motor and Gear                           67
   ........Line Feed Motor Gear                                  68
   ....3.2.21 Line Feed Motor Interconnect Module                69
   ....3.2.22 Reset Spring, Change Gear, and Idler Gear          70
   ....3.2.23 Release Lever                                      71
   ....3.2.24 Paper Pressure Guide                               72
   ....3.2.25 Pressure Roller Assembly                           73
   ....3.2.26 Tractor Assembly                                   74
   ....3.2.27 Sensor Lever                                       75
   ....3.2.28 Paper End (B) Lever                                76
   ....3.2.29 Main Chassis Assembly                              77
   3.3 Adjustments                                               78
   ....3.3.01 Printhead Gap Adjustment                           79
   3.4 Cleaning                                                  80
   3.5 Lubrication                                               81
4 Failure & Repair Analysis
   Table of Contents                                               Page
   Failure & Repair Analysis Introduction                           82
   4.4 Troubleshooting Tips                                         83
   ....4.4.02 Common Problems                                       84
   4.5 Fault Alarms                                                 85
   4.6 Repair Analysis Procedures - Using The Raps                  86
   4.6.02 RAP Index                                                 87
   ....4.6.03 Troubleshooting Cautions                              88
   ........RAP 01A:Operator Panel Lamps Do Not Light - Rev A, B,    89
   and C
   ........RAP 01B: Operator Panel Lamps Do Not Light - Rev D       90
   ........RAP 02A: Abnormal Spacing - Rev A, B, and C              91
   ........RAP 02B:Abnormal Spacing - Rev D                         92
   ........RAP 03:Wrong or Missing Characters / Dots on Output      93
   ........RAP 04:Line Feed Problems                                94
   ........RAP 05:Malfunction of Operator Panel Switch(es)          95
   ........RAP 06:Parallel Interface Does Not Receive Data          96
   ........RAP 07:Serial Interface Does Not Receive Data            97
   #4.7 Hexadecimal Dump - Procedure                                98
   4.8 Resistance / Service Checks - Index To Charts                99
   ....4.8.02 Interconnect Diagrams (Rev A & B)                    100
   ........Interconnect Diagrams (Rev C)                           101
   ........Interconnect Diagrams (Rev D)                           102
   ....4.8.03 Printhead                                            103
   ....4.8.04 Space Motor                                          104
   ....4.8.05 Line Feed Motor                                      105
   ....4.8.06 Operator Panel Board (Rev A, B, & C)                 106
   ........Operator Panel Board (Rev D)                            107
   ....4.8.07 Control Board (Rev A - D)                            108
   4.9 Printer Tests                                               109
   ....4.9.02 Rolling ASCII Print Test                             110
   ....4.9.03 Font Sample Test                                     111
   ....4.9.04 Serial Interface Loopback Test                       112
   4.10 Menu Operation                                             113
   4.11 Top Of Form                                                114
   4.12 Paper Park                                                 115
   4.13 Forms Tear Off                                             116
A Reference Charts
   A.1 Board Diagrams                                              117
   A.2 Index To Charts (A, B, C, D)                                118
   ....A.2.01 Control Board (LXMC) - Rev A and B                   119
   ........A.2.02 Control Board (LXMC-3) - Rev C                   120
   ........A.2.03 Control Board (LXMR) - Rev D                     121
   ....A.2.04 Power Supply (PAII-2) - Rev A and B                  122
   ........A.2.05 Power Supply (SUII-2) - Rev C                    123
   Table of Contents                                                  Page
    ....A.2.06 Filter Assembly - Rev A, B, C, and D                   124
    ....A.2.07 Operator Panel (LXSP) - Rev A, B, and C                125
    ........A.2.08 Operator Panel (LXON) - Rev D                      126
    ....A.2.09 RS232-C Serial Interface (LXHI) - Rev A, B, C, and D   127
B Illustrated Parts Listing
    Illustrated Parts Listing - General Information                   128
    ....B.1.02 Definitions of Terms                                   129
    B.2 Index to Illustrated Parts Breakdown Charts                   130
    ....B.2.01 Covers - Rev A, B, and C                               131
    ........B.2.02 Covers - Rev D                                     132
    ....B.2.03 Electrical Components - Rev A and B                    133
    ........B.2.04 Electrical Components - Rev C                      134
    ........B.2.05 Electrical Components - Rev D                      135
    ....B.2.06 Printer Mechanism - Rev A and B (1 of 2)               136
    ....B.2.07 Printer Mechanism - Rev A and B (2 of 2)               137
    ....B.2.08 Printer Mechanism - Rev C (1 of 2)                     138
    ....B.2.09 Printer Mechanism - Rev C (2 of 2)                     139
    ....B.2.10 Printer Mechanism - Rev D (1 of 2)                     140
    ....B.2.11 Printer Mechanism - Rev D (2 of 2)                     141
    ....B.2.12 Operator Panel - Rev A, B, C, and D                    142
    ....B.2.13 Carriage Assembly - Rev A, B, C, and D                 143
    ....B.2.14 Tractor Assembly - Rev A, B, C, and D                  144
    ....B.2.15 Options - Rev A, B, C, and D                           145
    ....B.2.16 Consumables - Rev A, B, C, and D                       146
    ....B.2.17 Packaging - Rev A, B, C, and D                         147
    ....B.2.18 Documentation - Rev A, B, C, and D                     148
                                                                                               Page: 2
                                                Service Guide ML320/ML321
                                                      Chapter 0 About This Manual




Manual Copyright

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