OKIDATA ML390 Service Manual
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OKIDATA ML390 Service Manual

Dot matrix printers
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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)
ML390/ML391
Dot Matrix Printers
Adobe Acrobat printable reference
copy of the OKIDATA Service Training Manual.
Service Guide ML390/391

Chapter 0 About This Manual

09/17/97
Page: 1

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Summary of Contents for OKIDATA ML390

  • Page 1 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.
  • Page 2 Table of Contents Page Service Guide ML390/391 0 About This Manual Front Cover Manual Copyright 1 Product Specifications 1.1 General Description - General Information ..1.1.02 Compatibility - Microline 390/391 vs. Microline 390/391-Plus 1.2 Product Specifications 1.3 Paper Specifications 1.4 Physical Specifications 1.5 Power Requirements...
  • Page 3 Table of Contents Page ..3.1.02 Maintenance Tools ..3.1.03 Maintenance Precautions 3.2 Disassembly/Assembly Procedures ..3.2.01 Preliminary Items ..3.2.02 Separator Assembly ..3.2.03 Printhead Assembly ..3.2.04 Upper Cover Assembly ..3.2.05 Operator Panel Assembly ..3.2.06 Control Board - Revs A and B ..Control Board - Rev C ..3.2.07 IC Card (B) Panel ..3.2.08 Transformer - Revs A and B ..Transformer - Rev C...
  • Page 4 Table of Contents Page 4.1 Overview - Introduction ..4.1.02 Compatibility - Microline 390/391 vs. Microline 390/391-Plus 4.2 Troubleshooting Updates 4.3 Reporting Problems 4.4 Troubleshooting Tips 4.5 Fault Alarms 4.6 Repair Analysis Procedures - Using The RAPS ..4.6.02 RAP Index ..4.6.03 Troubleshooting Cautions ..RAP 01: Operator Panel Lamps Do Not Light ..RAP 02: Abnormal Spacing ..RAP 03: Wrong or Missing Characters / Dots on Output...
  • Page 5 Table of Contents Page ..A.2.02 Control Board (SKRA) - Rev C and "Plus" Printers ..A.2.03 Power Supply (PAII) - Rev A and B ..A.2.04 Power Supply (SUII) - Rev C and "Plus" Printers ..A.2.05 Filter Assembly ..A.2.06 Operator Panel (LXSP) - Microline 390/391 ..A.2.07 Operator Panel (LXSP-5) - Microline 390/391-Plus ..A.2.08 Interconnect Board (SRBS) ..A.2.09 RS232-C Serial Interface (LXHI)

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