Lexmark 4022 schematic

• Table of Contents

• Start Diagnostics

• Safety and Notices

LexmarkTM W812

4022-XXX

• Trademarks

• Index

Lexmark and Le x m ark with dia mo nd des ig n are
trademarks of Lexmark International, Inc., registered
in the United States and/or other countries.

©

4022-XXX

Edition: October 2002

The following paragraph does not apply to any country where such provisions are inconsistent with local law:

LEXMARK INTERNATIONAL, INC. PROVIDES THIS PUBLICATION “AS IS” WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer of express or
implied warranties in certain transactions; therefore, this statement may not apply to you.

This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the
information herein; these changes will be incorporated in later editions. 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 [e-mail]. Lexmark may use or distribute any
of the information you supply in any way it believes appropriate without incurring any obligation to you. You can purchase
additional copies of publications related to this product by calling 1-800-553-9727. In other countries, contact your point of
purchase.

Lexmark Lexmark with diamond design, and MarkNet are trademarks of Lexmark International, Inc., registered in the
United States and/or other countries. Optra Forms is a trademark of Lexmark International, Inc.

PostScript is a registered trademark of Adobe Systems Incorporated.
Other trademarks are the property of their respective owners.

Copyright Lexmark International, Inc. 2002.

All rights reserved.

UNITED STATES GOVERNMENT RESTRICTED RIGHTS

This software and documentation are provided with RESTRICTED RIGHTS. Use, duplication or disclosure by the
Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer
Software clause at DFARS 252.227-7013 and in applicable FAR provisions: Lexmark International, Inc., Lexington, KY

40550. U.S.A.

U.S.A. P/N 12G9161

4022-XXX

Table of Contents

Laser Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ix

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Maintenance Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Preparing for shipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Overview of Print Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Paper Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Generating Print Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Transmission of Driving Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Driving Power Transmission to Paper Feeder . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Driving Power Transmission to Roll Registration Metal and Rubber . . . . . . . 1-14

Driving Power Transmission to Drum and Transfer Roller . . . . . . . . . . . . . . . . 1-15

Driving Power Transmission to Fuser Assembly . . . . . . . . . . . . . . . . . . . . . . . 1-16

Driving Power Transmission to Roll Assembly . . . . . . . . . . . . . . . . . . . . . . . . 1-17

Printer Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

250-Sheet Paper Tray/Cassette Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

Paper Pick/Feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

Fuser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

Frame and Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

Xerographics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

Diagnostic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Operator Panel Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Status Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Ready . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Status Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

User Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Service Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

User Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Service Error Code Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Service Check Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Service Checks Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

How to Use the Service Checks Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

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How to Follow a Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Notes on Using Service Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Symptom Service Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Inoperative Printer Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Erratic Printer Operation Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Blank, Erratic, or Inoperative Operator Panel Service Check . . . . . . . . . . . . . 2-16

Paper Feed Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Print Quality Service Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Using Diagnostic Test Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Light (Undertoned) Prints Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Blank Prints Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

Black Prints Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

Vertical Band Deletions Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

Horizontal Band Deletions Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

Vertical Streaks Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

Horizontal Streaks Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

Spot Deletions Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

Background Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

Toner on Back of Print Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

Skewed Image Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31

Damaged Prints Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

Unfused Image or Image Easily Rubs Off of Page Service Check . . . . . . . . . 2-33

Repetitive Marks on Each Page Service Check . . . . . . . . . . . . . . . . . . . . . . . 2-34

Lead Edge Registration is Not Correct Service Check . . . . . . . . . . . . . . . . . . 2-35

Side-to-Side Registration is Not Correct Service Check . . . . . . . . . . . . . . . . . 2-36

Electrical Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37

Diagnostic Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Using the Operator Panel Diagnostics Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Entering Diagnostic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Exiting Diagnostic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Print Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Print Quality Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Hardware Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

LCD Hardware Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Button Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

DRAM Memory Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

DRAM Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

ROM Memory Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Parallel Wrap Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Serial Wrap Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Duplex Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Duplex Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Duplex Sensor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

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Input Tray Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Input Tray Feed Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Base Sensor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Storage Device Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Quick Disk Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Disk Test/Clean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Flash Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Printer Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Setting the Page Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Viewing the Permanent Page Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Configuration ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

Error Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Viewing the Error Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Clearing the Error Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Viewing and Resetting the Maintenance Page Count . . . . . . . . . . . . . . . . . . . 3-22

Setting Printer Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Removals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Notations in the Removals and Replacement Procedures . . . . . . . . . . . . . . . . 4-1

Front Cov er Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Left Cover Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Rear Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Right Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Top Cover Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Card Cage Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Duplex Output Feed Roller Assembly and Clutch Removal . . . . . . . . . . . . . . . 4-9

Engine Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Fan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Fuser Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

HVPS Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

HVPS Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Left Cartridge Guide Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Lower Duplex Out Guide Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

LVPS Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

Main Drive Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

MPF Input Paper Feed Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

MPF Paper Present Flag Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

MPF Pick Roll Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

MPF Pick Roll Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

MPF Separator Pad Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23

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MPF Solenoid Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

MPF Tray Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

Operator Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

Optional 250-Sheet Pick Roller Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27

Optional 500-Sheet Pick Roller Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27

Optional 500-Sheet Separator Pad/Lift Plate Assembly Removal . . . . . . . . . . 4-28

Paper Size Dial and Card Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . 4-30

Paper Tray Lift Plate Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31

Printhead Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

Rear Plate Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33

Right Cartridge Guide Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

RIP Controller Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

Toner Sensor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35

Transfer Guide Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36

Transfer Roller Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38

Tray 1 Present Switch Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39

Tray 1 Pick Roll Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40

Tray 1 Pick Roller Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41

Tray 1 Solenoid Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42

Upper Duplex Out Guide Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . 4-43

Upper Card Cage Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44

250-Sheet Separator Pad Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . 4-45

Connector Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

P/J Location Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Harness Route Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Printer Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

Wiring Diagram Notations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

General Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16

Engine Board <-> LVPS <-> Interlock SW and Fan (1/3) . . . . . . . . . . . . . . . . 5-18

Engine Board <-> LVPS <-> Interlock SW and Fan (1/3) . . . . . . . . . . . . . . . . 5-19

Engine Board <-> LVPS <-> Interlock SW and Fan (3/3) . . . . . . . . . . . . . . . . 5-20

Engine Board <-> Fuser Assembly and LVPS (1/2) . . . . . . . . . . . . . . . . . . . . 5-20

Engine Board <-> Printhead and Toner Cartridge (1/3) . . . . . . . . . . . . . . . . . . 5-22

Engine Board <-> Printhead and Toner Cartridge (3/3) . . . . . . . . . . . . . . . . . . 5-24

Engine Board <-> HVPS <-> Toner Cartridge (BCR and Mag. Roll), Transfer Roller

and Detack Saw (1/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

Engine Board <-> HVPS <-> Toner Cartridge (BCR and Mag. Roll), Transfer Roller

and Detack Saw (3/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26

Engine Board <-> HVPS <-> Clutch Registration, Sensor Registration and Sensor

Option1 (1/1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26

Engine Board <-> Solenoid T1/MPF, Sensor LP/MPF NP/FDR LP/FDR NP, Clutch

Turn, and SW D2X (1/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28

Engine Board <-> Solenoid T1/MPF, Sensor LP/MPF NP/FDR LP/FDR NP, Clutch

Turn, and SW D2X (3/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30

Engine Board <-> LVPS <-> Main Motor (1/1) . . . . . . . . . . . . . . . . . . . . . . . . . 5-31

Engine Board <-> Sensor Toner (1/1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-32

vi

4022-XXX

Preventive Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Safety Inspection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Scheduled Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Parts Catalog. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-1

vii

4022-XXX

viii

4022-XXX

Laser Notices

Laser Advisory Label

Caution - Laser radiation when open. Avoid exposure to beam.

The following laser label may be affixed to this printer as shown.

Label

HVPS Cover

Printhead

Label

Laser Notice s ix

4022-XXX

210 C/410 F

Label

Fuser Asm

Laser Notices

x Service Manu al

The printer is certified in the U.S. to conform to the requirements of DHHS 21 CFR
Subchapter J for Class I (1) laser products, and elsewhere is certified as a Class I laser
product conforming to the requirements of IEC 60825-1.

Class I laser products are not considered to be hazardous. The printer contains internally
a Class IIIb (3b) laser that is nominally a 5 milliwatt gallium arsenide laser operating in the
wavelength region of 770-795 nanometers. The laser system and printer are designed so
there is never any human access to laser radiation above a Class I level during normal
operation, user maintenance, or prescribed service condition.

4022-XXX

Laser

Der Drucker erfüllt gemäß amtlicher Bestätigung der USA die Anforderungen der
Bestimmung DHHS (Department of Health and Human Services) 21 CFR Teil J für
Laserprodukte der Klasse I (1). In anderen Ländern gilt der Drucker als Laserprodukt der
Klasse I, der die Anforderungen der IEC (International Electrotechnical Commission)
60825-1 gemäß amtlicher Bestätigung erfüllt.

Laserprodukte der Klasse I gelten als unschädlich. Im Inneren des Druckers befindet sich
ein Laser der Klasse IIIb (3b), bei dem es sich um einen Galliumarsenlaser mit 5 Milliwatt
handelt, der Wellen der Länge 770-795 Nanometer ausstrahlt. Das Lasersystem und der
Drucker sind so konzipiert, daß im Normalbetrieb, bei der Wartung durch den Benutzer
oder bei ordnungsgemäßer Wartung durch den Kundendienst Laserbestrahlung, die die
Klasse I übersteigen würde, Menschen keinesfalls erreicht.

Avis relatif à l’utilisation de laser

Pour les Etats-Unis : cette imprimante est certifiée conforme aux provisions DHHS 21
CFR alinéa J concernant les produits laser de Classe I (1). Pour les autres pays : cette
imprimante répond aux normes IEC 60825-1 relatives aux produits laser de Classe I.

Les produits laser de Classe I sont considérés comme des produits non dan gereux.
Cette imprimante est équipée d’un laser de Classe IIIb (3b) (arséniure de gallium d’une
puissance nominale de 5 milliwatts) émettant sur des longueurs d’onde comprises entre
770 et 795 nanomètres. L’imprimante et son système laser sont conçus pour impossible,
dans des conditions normales d’utilisation, d’entretien par l’utilisateur ou de révision,
l’exposition à des rayonnements laser supérieurs à des rayonnements de Classe I .

Laser Notice s xi

4022-XXX

Avvertenze sui prodotti laser

Questa stampante è certificata negli Stati Uniti per essere conforme ai requisiti del DHHS
21 CFR Sottocapitolo J per i prodotti laser di classe 1 ed è certificata negli altri Paesi
come prodotto laser di classe 1 conforme ai requisiti della norma CEI 60825-1.

I prodotti laser di classe non sono considerati pericolosi. La stampante contiene al suo
interno un laser di classe IIIb (3b) all’arseniuro di gallio della potenza di 5mW che opera
sulla lunghezza d’onda compresa tra 770 e 795 nanometri. Il sistema laser e la
stampante sono stati progettati in modo tale che le persone a contatto con la stampante,
durante il normale funzionamento, le operazioni di servizio o quelle di assistenza tecnica,
non ricevano radiazioni laser superiori al livello della classe 1.

Avisos sobre el láser

Se certifica que, en los EE.UU., esta impresora cumple los requisitos para los productos
láser de Clase I (1) establecidos en el subcapítulo J de la norma CFR 21 del DHHS
(Departamento de Sanidad y Servicios) y, en los demás países, reúne todas las
condiciones expuestas en la norma IEC 60825-1 para productos láser de Clase I (1).

Los productos láser de Clase I no se consideran peligrosos. La impresora contiene en su
interior un láser de Clase IIIb (3b) de arseniuro de galio de funcionamiento nominal a 5
milivatios en una longitud de onda de 770 a 795 nanómetros. El sistema láser y la
impresora están diseñados de forma que ninguna persona pueda verse afectada por
ningún tipo de radiación láser superior al nivel de la Clase I durante su uso normal, el
mantenimiento realizado por el usuario o cualquier otra situación de servicio técnico.

Declaração sobre Laser

A impressora está certificada nos E.U.A. em conformidade com os requisitos da
regulamentação DHHS 21 CFR Subcapítulo J para a Classe I (1) de produtos laser. Em
outros locais, está certificada como um produto laser da Classe I, em conformidade com
os requisitos da norma IEC 60825-1.

Os produtos laser da Classe I não são considerados perigosos. Internamente, a
impressora contém um produto laser da Classe IIIb (3b), designado laser de arseneto de
potássio, de 5 milliwatts ,operando numa faixa de comprimento de onda entre 770 e 795
nanómetros. O sistema e a impressora laser foram concebidos de forma a nunca existir
qualquer possiblidade de acesso humano a radiação laser superior a um nível de Classe
I durante a operação normal, a manutenção feita pelo utilizador ou condições de
assistência prescritas.

xii Service Manual

4022-XXX

Laserinformatie

De printer voldoet aan de eisen die gesteld worden aan een laserprodukt van klasse I.
Voor de Verenigde Staten zijn deze eisen vastgelegd in DHHS 21 CFR Subchapter J,
voor andere landen in IEC 60825-1.

Laserprodukten van klasse I worden niet als ongevaarlijk aangemerkt. De printer is
voorzien van een laser van klasse IIIb (3b), dat wil zeggen een gallium arsenide-laser van
5 milliwatt met een golflengte van 770-795 nanometer. Het lasergedeelte en de printer
zijn zo ontworpen dat bij normaal gebruik, bij onderhoud of reparatie conform de
voorschriften, nooit blootstelling mogelijk is aan laserstraling boven een niveau zoals
voorgeschreven is voor klasse 1.

Lasermeddelelse

Printeren er godkendt som et Klasse I-laserprodukt, i overenstemmelse med kravene i
IEC 60825-1.

Klasse I-laserprodukter betragtes ikke som farlige. Printeren indeholder internt en Klasse
IIIB (3b)-laser, der nominelt er en 5 milliwatt galliumarsenid laser, som arbejder på
bølgelængdeområdet 770-795 nanometer. Lasersystemet og printeren er udformet
således, at mennesker aldrig udsættes for en laserstråling over Klasse I-niveau ved
normal drift, brugervedligeholdelse eller obligator iske servicebetingel se r.

Huomautus laserlaitteesta

Tämä kirjoitin on Yhdysvalloissa luokan I (1) laserlaitteiden DHHS 21 CFR Subchapter J ­määrityksen mukainen ja muualla luokan I laserlaitteiden IEC 60825-1 -määrityksen
mukainen.

Luokan I laserlaitteiden ei katsota olevan vaarallisia käyttäjälle. Kirjoittimessa on sisäinen
luokan IIIb (3b) 5 milliwatin galliumarsenidilaser, joka toimii aaltoalueella 770 - 795
nanometriä. Laserjärjestelmä ja kirjoitin on suunniteltu siten, että käyttäjä ei altistu luokan
I määrityksiä voimakkaammalle säteilylle kirjoitti men normaalin toiminnan, käyttäjän
tekemien huoltotoimien tai muiden huoltotoimien yhteydessä.

VARO! Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle
lasersäteilylle. Älä katso säteeseen.

V ARNING! Osynlig laserstrålning när denna del är öppnad och spärren är urkoppla d.
Betrakta ej strålen.

Laser Notices xiii

4022-XXX

Laser-notis

Laser-melding

Denna skrivare är i USA certifierad att motsvara kraven i DHHS 21 CFR, underparagraf J
för laserprodukter av Klass I (1). I andra länder uppfyller skrivaren kraven för
laserprodukter av Klass I enligt kraven i IEC 60825-1.

Laserprodukter i Klass I anses ej hälsovådliga. Skrivaren har en inbyggd laser av Klass
IIIb (3b) som består av en laserenhet av gallium-arsenid på 5 milliwatt som arbetar i
våglängdsområdet 770-795 nanometer. Lasersystemet och skrivaren är utformade så att
det aldrig finns risk för att någon person utsätts för laserstrålning över Klass I-nivå vid
normal användning, underhåll som utförs av användaren eller annan föreskriven
serviceåtgärd.

Skriveren er godkjent i USA etter kravene i DHHS 21 CFR, underkapittel J, for klasse I (1)
laserprodukter, og er i andre land godkjent som et Klasse I-laserprodukt i samsvar med
kravene i IEC 60825-1.

Klasse I-laserprodukter er ikke å betrakte som farlige. Skriveren inneholder internt en
klasse IIIb (3b)-laser, som består av en gallium-arsenlaserenhet som avgir stråling i
bølgelengdeområdet 770-795 nanometer. Lasersystemet og skriveren er utformet slik at
personer aldri utsettes for laserstråling ut ov er klasse I-nivå under vanlig bruk, vedlikehold
som utføres av brukeren, eller foreskrevne serviceoperasjoner.

Avís sobre el Làser

Segons ha estat certificat als Estats Units, aquesta impressora compleix els requisits de
DHHS 21 CFR, apartat J, pels productes làser de classe I (1), i segons ha estat certificat
en altres llocs, és un producte làser de classe I que compleix els requisits d’IEC 60825-1.

Els productes làser de classe I no es consideren perillosos. Aquesta impressora conté un
làser de classe IIIb (3b) d’arseniür de gal.li, nominalment de 5 mil.liwats, i funciona a la
regió de longitud d’ona de 770-795 nanòmetres. El sistema làser i la impress ora han
sigut concebuts de manera que mai hi hagi exposició a la radiació làser per sobre d’un
nivell de classe I durant una operació normal, durant les tasques de manteniment
d’usuari ni durant els serveis que satisfacin les condicions prescrites.

xiv Service Manual

4022-XXX

Japanese Laser Notice

Chinese Laser Notice

Laser Notices xv

4022-XXX

Korean Laser Notice

xvi Service Manual

4022-XXX

Safety Information

• The safety of this product is based on testing and approvals of the original design

and specific components. The manufacturer is not responsible for safety in the event

of use of unauthorized replacement parts.

• The maintenance information for this product has been prepared for use by a

professional service person and is not intended to be used by others.

• There may be an increased risk of electric shock and personal injury during

disassembly and servicing of this product. Professional service personnel should

understand this and take necessary precautions.

Consignes de Sécurité

• La sécurité de ce produit repose sur des tests et des

agréations portant sur sa conception d'origine et sur des composants particuliers.

Le fabricant n'assume aucune responsabilité concernant la sécur ité en cas

d'utilisation de pièces de rechange non agréées.

• Les consignes d'entretien et de réparation de ce produit s'adressent uniquement à

un personnel de maintenance qualifié.

• Le démontage et l'entretien de ce produit pouvant présenter certains risques

électriques, le personnel d'entretien qualifié devra prendre toutes les précautions

nécessaires.

Norme di sicurezza

• La sicurezza del prodotto si basa sui test e sull'approvazione del progetto originale e

dei componenti specifici. Il produttore non è responsabile per la sicurezza in caso di

sostituzione non autorizzata delle parti.

• Le informazioni riguardanti la manutenzione di questo prodotto sono indirizzate

soltanto al personale di assistenza autorizzato.

• Durante lo smontaggio e la manutenzione di questo prodotto,

il rischio di subire scosse elettriche e danni alla persona è più elevato. Il personale di

assistenza autorizzato, deve, quindi, adottare le precauzioni necessarie.

Sicherheitshinweise

• Die Sicherheit dieses Produkts basiert auf Tests und Zulassungen des

ursprünglichen Modells und bestimmter Bauteile. Bei Verwendung nicht

genehmigter Ersatzteile wird vom Hersteller keine Verantwortung oder Haftung für

die Sicherheit übernommen.

• Die Wartungsinformationen für dieses Produkt sind ausschließlich für die

Verwendung durch einen Wartungsfachmann bestimmt.

• Während des Auseinandernehmens und der Wartung des Geräts besteht ein

zusätzliches Risiko eines elektrischen Schlags und körperlicher Verletzung. Das

zuständige Fachpersonal sollte entsprechende Vorsichtsmaßnahmen treffen.

Safety Information xvii

4022-XXX

Pautas de Seguridad

• La seguridad de este producto se basa en pruebas y aprobaciones del diseño

original y componentes específicos. El fabricante no es responsable de la
seguridad en caso de uso de piezas de repuesto no autorizadas.

• La información sobre el mantenimiento de este producto está dirigida

exclusivamente al personal cualificado de mantenimiento.

• Existe mayor riesgo de descarga eléctrica y de daños personales durante el

desmontaje y la reparación de la máquina. El personal cualificado debe ser
consciente de este peligro y tomar las precauciones necesarias.

Informações de Segurança

• A segurança deste produto baseia-se em testes e aprovações do modelo original e

de componentes específicos. O fabricante não é respons ável pela segunran ça, no
caso de uso de peças de substituição não autorizadas.

• As informações de segurança relativas a este produto destinam-se a profissionais

destes serviços e não devem ser utilizadas por outras pessoas.

• Risco de choques eléctricos e ferimentos graves durante a desmontagem e

manutenção deste produto. Os profissionais destes serviços devem estar avisados
deste facto e tomar os cuidados necessários.

Informació de Seguretat

• La seguretat d'aquest producte es basa en l'avaluació i aprovació del disseny

original i els components específics.
El fabricant no es fa responsable de les qüestions de
seguretat si s'utilitzen peces de recanvi no autoritzades.

• La informació pel manteniment d’aquest producte està orientada exclusivament a

professionals i no està destinada
a ningú que no ho sigui.

• El risc de xoc elèctric i de danys personals pot augmentar durant el procés de

desmuntatge i de servei d’aquest producte. El personal professional ha d’estar-ne
assabentat i prendre
les mesures convenients.

xviii Service Manual

4022-XXX

Safety Information xix

4022-XXX

Preface

This manual contains maintenance procedures for service personnel only. It is divided
into the following chapters:

1. General Information contains a general description of the printer and the
maintenance approach used to repair it. Special tools and test equipment are listed
in this chapter, as well as general environmental and safety instructions.

2. Diagnostic Information contains an error indicator table, symptom tables, and
service checks used to isolate failing field replaceable units (FRUs).

3. Diagnostic Aids contains tests and checks used to locate or repeat symptoms of
printer problems.

4. Repair Information provides instructions for making printer adjustments and
removing and installing FRUs.

5. Connector Locations uses illustrations to identify the connector locations and test
points on the printer.

6. Preventive Maintenance contains the lubrication specifications and
recommendations to prevent problems.

7. Parts Catalog contains illustrations and part numbers for individual FRUs.

xx Service Manual

4022-XXX

1. General Information

The Lexmark™ W812 printer is a mid-range mono laser printer available in two models:

• 4022-100 is a base model of the W812 with 16MB of standard memory and USB/

parallel port co nnec to rs.

• 4022-110 is a network model of the W812 with 32 MB of standard memory and USB/

Ethernet 10BaseT/100BaseTX network port connectors.

Product features include:

• A3 support

• 26 ppm

• Memory expandable up to an additional 256MB

• Optional 250-sheet drawer

• Optional 500-sheet drawer

• Optional Unit

The product supports the following operating systems:

• Windows 95/98/Me

• Windows NT 4.0

• Windows 2000

• Windows XP

• Macintosh OS 8.6-9.x

• Macintosh OS X (10.1.2)

• UNIX/Linus

Maintenance Approach

The diagnostic information in this manual leads you to the correct field replaceable unit
(FRU) or part. Use the service error codes, user status messages, user error message,
service checks, and diagnostic aids to determine the printer problem and repair the
failure. After you complete the repair, perform tests as needed to verify the repair.

Tool s Required

The removal and replacement procedures described in this manual require the following
tools and equipment:

• Flat-blade screwdriver

• #1 Phillips screwdriver

• #2 Phillips screwdriver

• Needlenose pliers

• Diagonal pliers

• Spring hook

• Analog or digital multimeter

General Information 1-1

4022-XXX

Acronyms

BCR Bias Charge Roll
CM Charging and Metering
CSU Customer Setup
DIMM Dual Inline Memory Module
DRAM Dynamic Random Access Memory
EDO Enhanced Data Out
EP Electrophotographic Process
EPROM Erasable Programmable Read-Only Memory
ESD Electrostatic Discharge
FG Frame Ground
FRU Field Replaceable Unit
GB Gigabyte
HVPS High Voltage Power Supply
LASER Light Amplification by Stimulated Emission of Radiation
LCD Liquid Crystal Display
LD Laser Diode
LED Light-Emitting Diode
LVPS Low Voltage Power Supply
MROM Masked Read Only Memory
NVRAM Nonvolatile Random Access Memory
OEM Original Equipment Manufacturer
PC Photoconductor
POR Power-On Reset
POST Power-On Self Test
RIP Raster Imaging Processor
ROM Read-Only Memory
SDRAM Synchronous Dynamic Random Access Memory
SRAM Static Random Access Memory
UPR Used Parts Return
V ac Volts alternating current
V dc Volts direct current
TTL Transistor-Transistor Logic

1-2 Service Manual

4022-XXX

Preparing for shipping

When a printer is first installed, two transfer roll stops (bright orange in color) are removed
before the toner cartridge can be installed. These transfer roll stops prevent roll from
coming loose during shipping.

Whenever the printer is to be shipped, reinstall the stops.

Transfer Roll Stop

Left

Right

Transfer Roll Stop

Transfer Roll Assembly Transfer Roll Assembly

General Information 1-3

4022-XXX

Principles of Operation

Overview of Print Process

The printer provides a electrophotographic process function to print image on paper with
video signals sent from the controller board to the engine board. The electrophotographic
process consists of the following seven steps.

1. Charge - Equally assigns negative charge on the drum surface by the bias charge
roll.

2. Exposure - The laser scanner scans the drum surface and generates an invisible
electrostatic latent image on the drum surface using super-fine laser beams
modulated according to signals sent from the controller.

3. Development - Draws toner toward an electrostatic latent image on the drum
surface and creates a visible toner image.

4. Transcription - Transcribes a toner image from the drum surface to paper.

5. Exfoliation - Cast off paper from the drum surface by partially neutralizing charge on
paper.

6. Fusing - Permanently fuses a toner image by heat and pressure.

7. Cleaning - Eliminates the remaining toner from the drum surface.

1. Charge

Paper Enters

2. Exposure

3. Development

Xerographic cycle

Cycle repeats for the next print

4. Transfer

5. Detack

7. Cleaning

6. Fusing

Paper Exits

Rotating the drum, the drum surface passes six steps (charge, exposure, development,
transcription, exfoliation, and cleaning), creates a toner image, and transcribes the
created image on paper. Paper passes three steps (transcription, exfoliation, and fusing)
by the paper transfer mechanism. When paper is positioned as shown in image, toner
image is transcribed from the drum surface to paper, and then fused.

1-4 Service Manual

4022-XXX

The illustrations show the major components directly related to the print process and
paper transfer.

Back-up
Roll

6

FUSING

Detack Saw

Transfer Roller

5

DETACK

4

TRANSFER

Hot Roll

Cleaning
Blade

7

Drum

Mag.Roll

Paper

CLEANING

BCR

1

CHARGE

2

EXPOSURE

CM Blade

3

DEVELOPMENT

Laser Beam

General Information 1-5

4022-XXX

Pressure
Roll

Drum

Transfer
Roller

Mag. Roll

Fuser Assembly Heat Roll

Toner
Cartridge

Front

Printhead

1-6 Service Manual

4022-XXX

In the exposure step, thin laser beam scans the drum surface which was negatively
charged in the charging step of the previous process. The laser beam emitted by the laser
diode of the printhead scans from end to end of the drum through the rotating polyhedron
mirror (Polygon Mirror: 6 or 12 sides) and lens.

Radiation from the laser beam is adjusted according to the video signal from the
controller.

The laser beam irradiated to the drum excites the electron going toward the conductor
and generates a pair of electronic holes in the light transmission layer. As the electronic
holes move to the surface of the light transmission layer when the electron moves toward
the body in the drum along the electric field, the negative charge at that part decreases
and invisible electrostatic latent image is generated.

Toner is absorbed to the electrostatic latent image and developed.
Toner absorbed to the drum is attracted by the positive electric charge supplied by

Transfer Roller and transcribed on the paper and the drum goes to the separating and
cleaning process.

In the cleaning step, residual toner is removed from the drum surface as the surface is
prepared for the next cycle.

The toner is scraped off the drum surface by the cleaning blade.
Note: The toner rubbed off in the cleaning step is collected in the recovery toner

compartment separated from the unused toner. The transcription ratio is 90% or more,
but it varies depending on the image cover range and environment conditions such as the
temperature and humidity. The used toner cannot be reused.

Note: At the starting time for each print process, the entire drum surface is scanned with
laser beams, and the charge remaining on the drum surface from the preceding print step
is removed completely.

Note: At the starting and ending times of the continuous print process, the negative high­voltage is applied to the Transfer Roller. If residual toner is on the Transfer Roller surface
in the preceding print step, it is returned onto the drum surface to clean the Transfer
Roller surface.

General Information 1-7

4022-XXX

Paper Transfer

Paper is supplied from tray 1 or chute MPF, and carried to the printer along the paper
route shown in the illustration.

The optional duplex assembly has an individual motor (bracket assembly motor duplex) to
transfer paper.

Tray 1

Roll Assembly Tray 1

Roll Pinch Registration (lower)

Roll Pinch Registration (upper)

Chute Assembly Transfer

MPF

Roll Assembly MPF

Roll Registration Metal

Roll Registration Rubber

Transfer Roller

Drum

Toner Cartridge

Fuser Assembly

1-8 Service Manual

Heat Roll

Pressure Roll

Roll Assembly Decurler

Roll Pinch

Roll Assembly Exit

Roll Pinch

4022-XXX

The illustration below shows the major components directly related to the paper route and
paper transfer. See "Options" for the major components related to the paper route and
paper transfer when the optional devices (Tray 2, Tray 3, and Duplex) are attached to the
printer.

Exit Sensor

Pressure
Roll

Drum

Transfer
Roller

Roll
Registration
Metal

Roll
Registration
Rubber

Roll Pinch Exit

Sensor
Registration

Exit Roll

Roll Assembly
Tray 1

Heat Roll

Front

Roll Assembly MPF

Generati n g P r int Image

The printers attached to the network, the network interface card (NIC) of the printer
connected to network receives packet signals from a network client or server in a bit
stream, and decomposes the received packet signals into a data format for the layer
where data is sent to the controller. The controller processes the data sent from the NIC
in the same way as of the data received from the host computer through a parallel port.
Data received from the NIC or parallel port is called host data.

The controller board buffers host data in the lustered bit image or converts host data of
the page description language (PDL) into the lustered bit image data. The controller
board sends the lustered bit image data to the engine board line by line each time laser
beams are scanned.

The signal that transfers image data (/VDO signal) is converted into an LVDS signal by
the engine board, and sent to the printhead as a P.DATA+P.DATA signal. The printhead

General Information 1-9

4022-XXX

converts the signal into laser beams, and radiated as super fine laser beams. The laser
beams are turned on and off according to a video signal. Laser beams, that are emitted
from the surface of the rotating polygon mirror, are collectively irradiated on the drum
surface of the EP cartridge. An electrostatic latent image is then generated on the drum
surface.

Transmission of Driving Power

The driving power is generated by the Motor Assembly (component of the Main Drive
Assembly), and transferred to the printer components, that requires the mechanical
driving power, through the gear and gear train in the Main Drive Assembly.

As shown in the following illustrations, the driving power is distributed to the toner
cartridge, chute assembly transfer, Roll Assembly MPF, Roll assembly tray 1, optional
feeder, and fuser assembly through the gear in the drive assembly.

The driving power transmitted to the chute assembly transfer drives the roll registration
metal and roll registration rubber. The driving power transmitted to the toner cartridge
drives the drum, and it is transmitted to the Transfer Roller of the chute assembly transfer.
The driving power transmitted to the fuser assembly drives the heat roll, and it is further
transmitted to the roll assembly exit by the gear decurler.

1-10 Service Manual