Lexmark T640TN - Monochrome Laser Printer Service Manual

Service manual

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Revised September 27, 2005

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Lexmark™ T640, T642, and T644

4061-xx0

• Table of Contents

• Start Diagnostics

• Safety and Notices

• Trademarks

• Index

Lexmark and Lexmark with diamond design are

trademarks of Lexmark International, Inc., registered

in the United States and/or other countries.

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Page 1 Lexmark™ T640, T642, and T644 4061-xx0 • Table of Contents • Start Diagnostics • Safety and Notices • Trademarks • Index Lexmark and Lexmark with diamond design are trademarks of Lexmark International, Inc., registered in the United States and/or other countries.
Page 2: United States Government Rights
Improvements or changes in the products or the programs described may be made at any time. Comments may be addressed to Lexmark International, Inc., Department D22A/032-2, 740 West New Circle Road, Lexington, Kentucky 40550, U.S.A or e-mail at ServiceInfoAndTraining@Lexmark.com. Lexmark may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you.
Page 3 4061-xx0 Table of contents Laser notices ............xi Safety information .
Page 4 4061-xx0 Power-On Self Test (POST) sequence ........... .2-4 Symptom tables .
Page 5 4061-xx0 Printhead service check ............2-122 Signature button assembly service check .
Page 6 4061-xx0 Envelope Enhance ............3-20 Engine Setting 1 through 4 .
Page 7 4061-xx0 23x and 24x jams ............3-40 200 and 201 Paper Jam Remove Cartridge.
Page 8 4061-xx0 MPF lower paper deflector ............4-61 MPF pick tire removal .
Page 9 4061-xx0 Assembly 15: Electronics—card assemblies ......... . . 7-30 Assembly 16: Electronics—shields .
Page 10 4061-xx0 Printing a directory list ............A-14 Printing confidential and held jobs .

20g1500 - t 640rn b/w laser printer