LEXMARK C91x Service Manual

Lexmark C91x

• Table of Contents

• Start Diagnostics

• Safety and Notices

• Trademarks

5055-xxx

•Index

Lexmark and Lexmark with diamond
design are trademarks of Lexmark
International, Inc., registered in the
United States and/or other countries.

5055-xxx

Edition: June 2004
The following paragraph does not apply to any country where such provisions are

inconsiste nt with local law: LEXMARK INTERNATIONAL, INC. PROVIDES THIS

PUBLICATION “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPR E SS O R
IMPLIED, INCLUDING, BUT NOT LI MITED 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 electronically mailed
(e-mail) to [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 and Lexmark with diamond design are trademarks of Lexmark International,
Inc., registered in the United States and/or other countries.

ImageQuick, Optra Forms, and PrintCryption are trademarks of Lexmark International,
Inc.

PCL® is a registered trademark of the Hewlett-Packard Company.
PostScript® is a registered trademark of Adobe Systems Incorporated.
Other trademarks are the property of their respective owners.

© 2003, 2004 Lexmark International, Inc.
All rights reserved.

UNITED STATES GOVERNMENT RIGHTS

This software and any accompanying documentation provided under this agreement are
commercial computer software and documentation developed exclusively at private
expense.

P/N 12G9292

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Contents

Safety information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-xvi

General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Model differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Toner darkness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Color correction settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Physical specifications and weight . . . . . . . . . . . . . . . . . . . . . 1-3

Print speed and performance . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Time to first print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Duty cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Printer memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Resident fonts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Paper and media specifications . . . . . . . . . . . . . . . . . . . . . . . 1-8

Input and output configurations. . . . . . . . . . . . . . . . . . . . . . . . 1-8

Media size supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Input media types and weights . . . . . . . . . . . . . . . . . . . . . . . 1-15

Output media types and weights. . . . . . . . . . . . . . . . . . . . . . 1-16

Input capacity by media and source . . . . . . . . . . . . . . . . . . . 1-18

Output capacity by media and source. . . . . . . . . . . . . . . . . . 1-19

Media guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

Print area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

Options and features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

Optional internal local connections . . . . . . . . . . . . . . . . . . . . 1-23

Network connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

Data streams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

Operating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

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Power and electrical specifications . . . . . . . . . . . . . . . . . . . .1-26

Power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-26

Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-26

Operating clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-27

Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-27

Printer temperature and humidity. . . . . . . . . . . . . . . . . . . . . .1-27

Maintenance approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-29

Standard inspection and cleaning procedure. . . . . . . . . . . . .1-29

Return parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-30

Service recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . .1-30

Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-31

Serial number, configuration ID, and part number . . . . . . . . .1-32

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-33

Diagnostic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

Adjustments and procedures following parts replacement. . . .2-1

Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Initial check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Printer messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Service error message tables. . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Attendance messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-34

Maintenance analysis procedures (MAPS) . . . . . . . . . . . . . .2-54

Symptom table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-63

Service checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-68

Drive 1 DC motor service check. . . . . . . . . . . . . . . . . . . . . . .2-68

Drive 2 stepper motor service check . . . . . . . . . . . . . . . . . . .2-68

Duplex unit service check. . . . . . . . . . . . . . . . . . . . . . . . . . . .2-69

Expansion paper feed service check . . . . . . . . . . . . . . . . . . .2-69

Face down stacker full service check. . . . . . . . . . . . . . . . . . .2-70

High-capacity feeder (HCF) service check. . . . . . . . . . . . . . .2-70

Finisher service check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-71

Marks on paper service check . . . . . . . . . . . . . . . . . . . . . . . .2-72

Operator panel service check. . . . . . . . . . . . . . . . . . . . . . . . .2-73

Paper carrying service check . . . . . . . . . . . . . . . . . . . . . . . . .2-74

Paper exit, face up service check. . . . . . . . . . . . . . . . . . . . . .2-82

Paper skew service check . . . . . . . . . . . . . . . . . . . . . . . . . . .2-83

Paper tray missing service check. . . . . . . . . . . . . . . . . . . . . .2-83

Photodeveloper missing service check . . . . . . . . . . . . . . . . .2-84

Power supply service check . . . . . . . . . . . . . . . . . . . . . . . . .2-85

210 Staple jam service check. . . . . . . . . . . . . . . . . . . . . . . . .2-86

Transfer belt up/down service check . . . . . . . . . . . . . . . . . . .2-87

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Image quality troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 2-88

Print quality problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-88

Options service check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98

Diagnostic aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Power-On Self Test sequence . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Using the operator panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Operator panel buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Printing the menu settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Operator menu disabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Menu overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Diagnostic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Adjustment example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Print tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Hardware tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

High-capacity feeder tests. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

Finisher tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Device tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

Diagnostics - printer setup . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26

Defaults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26

Viewing and resetting the drum counters . . . . . . . . . . . . . . . 3-28

Diagnostics - error log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31

Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33

Processes and configuration. . . . . . . . . . . . . . . . . . . . . . . . . 3-33

Electrophotography process . . . . . . . . . . . . . . . . . . . . . . . . . 3-33

Development unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34

Transfer unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34

Cleaning unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35

Paper feeding / fusing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35

Drive system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

Paper feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

Cassette paper feeder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

Multipurpose feeding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38

Registration unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38

Separation unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

Fuser unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40

Delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-41

Belt unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42

Belt up/down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43

Expansion paper feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43

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Duplex unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-44

Paper weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-45

Clearing paper jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-46

High-capacity feeder (HCF) . . . . . . . . . . . . . . . . . . . . . . . . . .3-52

Maintenance Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-60

Finisher. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-61

Finisher installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-73

Attaching the docking plate and guide rail . . . . . . . . . . . . . . .3-73

Combining the finisher and stand. . . . . . . . . . . . . . . . . . . . . .3-75

Attaching the bins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-79

Aligning the finisher and printer . . . . . . . . . . . . . . . . . . . . . . .3-80

Adjusting the wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-88

Attaching the cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-90

Hole punch adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-94

Repair information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

Service precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

Handling printed circuit boards. . . . . . . . . . . . . . . . . . . . . . . . .4-1

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

High-capacity paper feed timing belt adjustment . . . . . . . . . . .4-3

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

Cover, top removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

Cover, front removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

Cover, front left removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

Cover, rear removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

Cover, solenoid removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

Cover, left side removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

Cover, right side removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

Cover, RIP board removal . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

Tray, paper exit removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10

Belt up/down clutch removal . . . . . . . . . . . . . . . . . . . . . . . . .4-10

Belt up/down detection sensor removal . . . . . . . . . . . . . . . . .4-11

Cassette guide removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12

Connector, duplex unit removal . . . . . . . . . . . . . . . . . . . . . . .4-13

Separation fingers removal . . . . . . . . . . . . . . . . . . . . . . . . . .4-14

Sensor cleaner removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14

Drive gear unit sensor assembly removal . . . . . . . . . . . . . . .4-15

Drive motor assembly removal. . . . . . . . . . . . . . . . . . . . . . . .4-16

Electronic box removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17

Fanning pad removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

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Front cover open switch actuator removal . . . . . . . . . . . . . . 4-20

Fuser removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

High voltage power supply board (HVU) removal. . . . . . . . . 4-23

LED printhead removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

Eraser removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27

Lock handle assembly removal. . . . . . . . . . . . . . . . . . . . . . . 4-28

Main drive unit removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29

Main unit fan removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

Motor drive board removal . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33

Multipurpose feeder paper present sensor removal . . . . . . . 4-33

Multipurpose feeder tray removal . . . . . . . . . . . . . . . . . . . . . 4-34

Operator panel removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

Paper carrying frame removal. . . . . . . . . . . . . . . . . . . . . . . . 4-35

Paper carrying roller removal . . . . . . . . . . . . . . . . . . . . . . . . 4-36

Paper feed frame removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37

Paper feed roller removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38

Paper pres ent sensor removal . . . . . . . . . . . . . . . . . . . . . . . 4-38

Paper remaining sensor removal . . . . . . . . . . . . . . . . . . . . . 4-39

Paper size sensor board assembly removal. . . . . . . . . . . . . 4-39

Power supply 1 removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40

Power supply 2 removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41

Power switch removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42

Printer controller removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43

Printhead controller board removal. . . . . . . . . . . . . . . . . . . . 4-44

Registration sensor removal . . . . . . . . . . . . . . . . . . . . . . . . . 4-48

Right slide rail removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49

RIP box removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49

Sensor board removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50

Stay arm removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51

Sub-frame removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52

Sub frame F1, sub frame F2 removal . . . . . . . . . . . . . . . . . . 4-53

Top unit removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-55

Transfer belt removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56

Turn guide cover sensor removal . . . . . . . . . . . . . . . . . . . . . 4-65

Upper fan removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-66

Options removals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-67

Expansion paper feeder removal . . . . . . . . . . . . . . . . . . . . . 4-67

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Duplex removals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-75

Duplex unit separation removal . . . . . . . . . . . . . . . . . . . . . . .4-75

Duplex unit removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-76

Duplex timing belt removal. . . . . . . . . . . . . . . . . . . . . . . . . . .4-76

Duplex pressure roller and solenoid removal. . . . . . . . . . . . .4-77

Duplex feed roller and solenoid removal . . . . . . . . . . . . . . . .4-78

Duplex side fence motor assembly/side fence removal . . . . .4-79

Duplex paper carrying motor removal . . . . . . . . . . . . . . . . . .4-80

High-capacity feeder (HCF) removals . . . . . . . . . . . . . . . . . .4-81

HCF covers removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-81

HCF call roller, paper feed roller, reverse roller removal . . . .4-82

HCF pickup solenoid removal . . . . . . . . . . . . . . . . . . . . . . . .4-83

HCF tray motor removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-86

HCF paper level sensor removal . . . . . . . . . . . . . . . . . . . . . .4-87

HCF power supply removal . . . . . . . . . . . . . . . . . . . . . . . . . .4-88

Finisher removals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-89

External covers removals. . . . . . . . . . . . . . . . . . . . . . . . . . . .4-89

Finisher control board removal. . . . . . . . . . . . . . . . . . . . . . . .4-90

Elevator motor removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-91

Feed motor assembly removal. . . . . . . . . . . . . . . . . . . . . . . .4-91

Hole punch removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-92

Inverter paper exit discharge brus h rem ova l . . . . . . . . . . . . .4-93

Inverter paper exit roller removal . . . . . . . . . . . . . . . . . . . . . .4-93

Jogging unit removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-95

Path select gate removal . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-96

Patting roller removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-97

Power supply removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-99

Registration roller removal . . . . . . . . . . . . . . . . . . . . . . . . . .4-100

Registration roller clutch removal. . . . . . . . . . . . . . . . . . . . .4-101

Stack area discharge brush removal . . . . . . . . . . . . . . . . . .4-102

Staple unit removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-102

Straight paper exit discharge brush removal . . . . . . . . . . . .4-103

Straight paper exit roller removal . . . . . . . . . . . . . . . . . . . . .4-103

Timing belts 1 and 2 removal . . . . . . . . . . . . . . . . . . . . . . . .4-105

Tractor belt removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-106

Tractor drive motor assembl y remov al. . . . . . . . . . . . . . . . .4-108

viii Service Manual

5055-xxx

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

Covers diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Major parts diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Sensor and switch locations . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Component locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Printer controller board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Printer controller board connectors. . . . . . . . . . . . . . . . . . . . . 5-9

Printhead controller board. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

RIP board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

Power source unit 1 board . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

Power source unit 2 board . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

High voltage power supply board . . . . . . . . . . . . . . . . . . . . . 5-15

Sensor board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

Expansion paper feeder controller board . . . . . . . . . . . . . . . 5-16

Duplex unit controller board . . . . . . . . . . . . . . . . . . . . . . . . . 5-16

Motor drive board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16

Size sensor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17

High-capacity feeder (HCF) . . . . . . . . . . . . . . . . . . . . . . . . . 5-18

High-capacity paper feed configuration. . . . . . . . . . . . . . . . . 5-18

Electrical parts layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19

Driving parts layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

Finisher locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Maintenance kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Periodic maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Lubricants and cleaners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Parts catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

How to use this parts catalog . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Assembly 1: Covers 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Assembly 2: Covers 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Assembly 3: Covers 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

Assembly 4: Covers 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

Assembly 5: Covers 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

Assembly 6: Upper unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12

Assembly 7: Base 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16

Assembly 8: Base 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18

Assembly 9: Base 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20

ix

5055-xxx

Assembly 10: Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-22

Assembly 11: Rip board. . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-26

Assembly 12: Fuse r unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-28

Assembly 13: Cassette. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-30

Assembly 14: Expansion feeder 1 . . . . . . . . . . . . . . . . . . . . .7-32

Assembly 15: Expansion feeder 2 . . . . . . . . . . . . . . . . . . . . .7-34

Assembly 16: Duplex unit 1 . . . . . . . . . . . . . . . . . . . . . . . . . .7-38

Assembly 17: Duplex unit 2 . . . . . . . . . . . . . . . . . . . . . . . . . .7-40

Assembly 18: High-capacity feeder 1. . . . . . . . . . . . . . . . . . .7-42

Assembly 19: High-capacity feeder 2. . . . . . . . . . . . . . . . . . .7-44

Assembly 20: High-capacity feeder 3. . . . . . . . . . . . . . . . . . .7-46

Assembly 21: High-capacity feeder 4. . . . . . . . . . . . . . . . . . .7-48

Assembly 22: High-capacity feeder 5. . . . . . . . . . . . . . . . . . .7-50

Assembly 23: High-capacity feeder 6. . . . . . . . . . . . . . . . . . .7-52

Assembly 24: Finisher covers . . . . . . . . . . . . . . . . . . . . . . . .7-54

Assembly 25: Finisher frame . . . . . . . . . . . . . . . . . . . . . . . . .7-56

Assembly 26: Finisher feed 1. . . . . . . . . . . . . . . . . . . . . . . . .7-58

Assembly 27: Finisher feed 2 . . . . . . . . . . . . . . . . . . . . . . . .7-62

Assembly 28: Finisher elevator . . . . . . . . . . . . . . . . . . . . . . .7-64

Assembly 29: Finisher electronics . . . . . . . . . . . . . . . . . . . . .7-66

Assembly 30: Finisher docking 1 . . . . . . . . . . . . . . . . . . . . . .7-68

Assembly 31: Finisher docking 2 . . . . . . . . . . . . . . . . . . . . . .7-70

Assembly 32: Miscellaneous/options . . . . . . . . . . . . . . . . . . .7-72

Assembly 33: Finisher parts packet

P/N 56P9480 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-81

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

Part number index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-9

x Service Manual

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
necessar y pr ec autions.

• CAUTION: When you see this symbol, there is a

danger from hazardous voltage in the area of the
product where you are working. Unplug the product
before you begin, or use caution if the product must
receive power in order to perform the task.

Consignes de sécurité

5055-xxx

• 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 sécurité 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.

• ATTENTION : Ce symbole indique la présence

d'une tension dangereuse dans la partie du produit
sur laquelle vous travaillez. Débranchez le produit
avant de commencer ou faites preuve de vigilance si
l'exécution de la tâche exige que le produit reste sous
tension.

Safety information xi

5055-xxx

Norme di sicurezza

• La sicurezza d el 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.

• ATTENZIONE: Questo simbolo indica la presenza

di tensione pericolosa nell'area del prodotto.
Scollegare il prodotto prima di iniziare o usare
cautela se il prodotto deve essere alimentato per
eseguire l'intervento.

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 V orsichtsmaßnahmen
treffen.

• ACHTUNG: Dieses Symbol weist auf eine

gefährliche elektrische Spannung hin, die in diesem
Bereich des Produkts auftreten kann. Ziehen Sie vor
den Arbeiten am Gerät den Netzstecker des Geräts,
bzw. arbeiten Sie mit großer Vorsicht, wenn das
Produkt für die Ausführung der Arbeiten an den
Strom angeschlossen sein muß.

xii Service Manual

Pautas de Seguridad

• La seguridad de este producto se basa en pruebas y

aprobaciones del dise ño 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.

• PRECAUCIÓN: este símbolo indica que el voltaje

de la parte del equipo con la que está trabajando es
peligroso. Antes de empezar, desenchufe el equipo
o tenga cuidado si, para trabajar con él, debe
conectarlo.

Informações de Segurança

5055-xxx

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

do modelo original e de componentes específicos. O fabricante
não é responsável pela segunrança, no caso de uso de peças
de substituição não autorizadas.

• As informações de segurança relativas a este produto

destinam-se a profissio nai s 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.

• CUIDADO: Quando vir este símbolo, existe a

possível pr esença de uma potencial tensão perigosa
na zona do produto em que está a trabalhar. Antes
de começar, desligue o produto da tomada eléctrica
ou seja cuidadoso caso o produto tenha de estar
ligado à corrente eléctrica para realizar a tarefa
necessária.

Safety information xiii

5055-xxx

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 se rv e i d’aquest producte.
El personal professional ha d’estar-ne assabentat i prendre
les mesures convenients.

• PRECAUCIÓ: aquest símbol indica que el voltatge

de la part de l'equip amb la qual esteu treballant és
perillós. Abans de començar, desendolleu l'equip
o extremeu les precaucions si, per treballar amb
l'equip, l'heu de connectar.

xiv Service Manual

5055-xxx

Safety information xv

5055-xxx

Preface

This manual contains maintenance procedures for service
personnel. 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, 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.

Definitions

Note: A note provides additional information.
Warning: A warning identifies something that might damage the

product hardware or software.
CAUTION: A caution identifies something that might cause a

servicer harm.

CAUTION: When you see this symbol, there is a
danger from hazardous voltage in the area of the
product where you are working. Unplug the product
before you begin, or use caution if the product must
receive power in order to perform the task.

xvi Service Manual

5055-xxx

1. General information

Overview

The Lexmark™ C91x printers are high-speed, wide-format color
LED Electrophotographic color printers with superior print quality for
high-volume printing.

Resolution

• 600 x 600 dpi

• 2400 image quality

Model differences

C912

5055-230

28/29 ppm engine X X X X X
USB/parallel X X
USB/Ethernet X X X
Memory (MB) 256 256 128 64 64

Options available

550-sheet drawer X X X
Duplex X X
Hard disk X X
Staple and punch

finisher w/stand
Printer cabinet X X

XX

C912

5055-210

C912

5055-200

C910

5055-01N

5055-010

C910

General information 1-1

5055-xxx

Technical specifications

Toner darkness

Toner darkness settings offer four user-selectable settings to
balance print darkness and toner savings. The higher the setting,
the darker the print. The toner darkness default setting is 4.

The toner darkness setting is available through the operator panel
under the Print Quality menu.

Color correction settings

There are four color correction settings to provide flexibility in
choosing the type of color correction to be applied when printing a
file.

• Auto (default)—provides ease of use with no color science

knowledge required

• Vivid—adjusts CMYK components, with the result being colors

that are more saturated

• Off—no color correction is implemented from RGB or CMYK

applications

• CMYK—provides the application's color correction instead of

the printer's algorithms

Black and White Lock—(in configuration menu) allows printer and
network administrators to lock the printer in a mode that will only
print black. This feature cannot be overridden with any other menu
or driver selection.

1-2 Service Manual

5055-xxx

Physical specifications and weight

Description Height Width Depth Weight

Printers

Lexmark C91x

Lexmark C91xn

1

2,4

20.2 in.
(512 mm)

25.2 in.
(641 mm)

27.4 in.
(695 mm)

27.4 in.
(695 mm)

25.8 in.
(655 mm)

25.8 in.
(655 mm)

177 lb
(80.5 kg)

217.8 lb
(99.0 kg)

Lexmark C91xdn 25.2 in.

(641 mm)

Lexmark C91xfn

3

40.5 in.
(1028 mm)

Fully configured

4

40.5 in.
(1028 mm)

27.4 in.
(695 mm)

46.9 in.
(1191 mm)

60.0 in.
(1520 mm)

25.8 in.
(655 mm)

25.8 in.
(655 mm)

25.8 in.
(655 mm)

230.8 lb
(104.9 kg)

336.4 lb
(152.9 kg)

443.3 lb
(201.5 kg)

Options

Duplex unit 4.7 in.

(120 mm)

550-Sheet drawer 5.1 in.

(129 mm)

High-capacity f ee der,
3000-sheet

Staple Punch finisher,
1100-sheet

25.0 in.
(635 mm)

41.7 in.
(1060 mm)

27.4 in.
(695 mm)

27.4 in.
(695 mm)

14.2 in.
(360 mm)

19.5 in.
(495 mm)

13.8 in.
(350 mm)

25.8 in.
(655 mm)

20.7 in.
(525 mm)

20.5 in.
(520 mm)

13.0 lb
(5.9 kg)

40.8 lb
(18.5 kg)

50.0 lb
(22.6 kg)

56.9 lb
(25.9 kg)

(with stand)

Furniture

Printer cabinet 20.4 in.

(517 mm)

Printer base 10.2 in.

(260 mm)

1

Base model with standard 550-sheet input tray.

2

Network model is network-ready printer with standard 550-sheet input tray plus one
optional 550-sheet drawer.

3

Finisher model is a duplex model printer with 1100-sheet punch finisher and printer
cabinet.

4

Fully configured models include base printer with four standard 550-sheet input
trays, 3000-sheet feeder, 1100-sheet staple punch finisher, duplex unit, and printer
base.

26.6 in.
(675 mm)

26.6 in.
(675 mm)

23.6 in.
(598 mm)

23.6 in.
(547 mm)

57.5 lb
(26.0 kg)

33.0 lb
(15.0 kg)

General information 1-3

5055-xxx

Print speed and performance

Standard and
heavy media
tray

Simplex printing on letter-size media (pages per minute)

Letter—8.5 in. x 11 in. 28 28 28
Ledger 16 N/A 16
Legal—8.5 in. x 14 in. 19 N/A 19
A3 16 N/A 16
A4—3.4 in. x 11.7 in. 29 29 29
A5/Executive N/A N/A 38
B4 18 N/A 18
B5 N/A N/A 32
Transparencies 22 N/A 22
Card stock N/A N/A 11
Envelopes N/A N/A 11
Paper labels 22 N/A 22

Duplex printing on letter-size media (sides per minute)

High-capacity
feeder

Multipurpose
feeder

1

1,2,3,4

Letter—8.5 in. x 11 in. 19 19 19
Ledger 11 N/A 11
Legal—8.5 in. x 14 in. 12 N/A 12
A3 11 N/A 11
A4—3.4 in. x 11.7 in. 19 19 19
A5/Executive N/A N/A 20

1-4 Service Manual

5055-xxx

B4 12 N/A 12
B5 N/A N/A 19

1

Folio and statement paper support from multipurpose feeder only.

2

Speeds.

3

When printing from the multipurpose feeder: Simplex—the first three pages print a

“legal” speed with the balance printing at the speed consistent with the actual media
size. Duplex—all pages print at “legal” speed.

4

Average duple x print performance measured under the following conditions: Simplex

text document from the printer’s integrated tray to the printer’s standard output bin,
with a job stream sufficiently long for the printer system to enter the maximum
duplex print performance page sequence (2,4,6,1,3,5...) The first two sides (2 and 4)
are not included in the performance computation since they “seed” the printer
system’s paper path to achieve the maximum duplex print performance.

Performance

The Lexmark C91x printers support the speeds listed above.
Performance depends on:

• Interface to the host (USB, serial, parallel, network)

• Host system and application

• Page complexity and content

• Certain printer options installed or selected

• Printer memory

• Media size and type

Time to first print

Time to first print is 15 seconds.

Processor

• 400 MHz (C910)

• 600 MHz (C912)

Duty cycle

• Maximum duty cycle–100,000 pages

• True continuous duty cycle–10,000 pages

• Lifetime maximum duty cycle–600,000 pages

General information 1-5

5055-xxx

Printer memory

Memory configuration

DRAM memory Standard Maximum

Lexmark C910(n) 64MB 512MB
Lexmark C910dn 128MB 512MB
Lexmark C912(n) 128MB 512MB
Lexmark C912(dn) 256MB 512MB

Available memory options

Optional 64MB, 128MB and 256MB SDRAM DIMMs are available
from Lexmark.

Flash memory options

Optional 4MB, 8MM and 16MB DIMMs are available from Lexmark.

Memory and expansion slots

• Memory slots for extra flash or DRAM

– Two for Lexmark C910(n) and Lexmark C912(n)
– One for Lexmark C910(dn) and Lexmark C912(dn)

• One expansion slot for optional interface cards

• One optional firmware expansion slots (application solution

firmware card)

• One on-board hard disk interface (for optional hard disk)

SDRAM and flash memory options are interchangeable within any of
the memory slots available on the system board. However, only one
flash memory Maintenance Approach option will be recognized. If
multiple flash memory options are installed, the system will
recognize the largest one.

1-6 Service Manual

5055-xxx

Resident fonts

Emulation Scalable Fonts Bitmapped fonts

PCL 6 84 2
PostScript 3 156 0

For a listing of specific fonts, visit www.lexmark.com.
There are 83 symbol sets in the PCL 6 emulation to support all the

languages that use these characters.
Not all symbol sets are supported by all fonts. Refer to the Technical

Reference or use the printer operator panel to find which symbol
sets are supported by each font.

Support for the euro currency character is included in all applicable
fonts for both PostScript and PCL emulations. Twelve PCL symbol
sets support the euro character, including all seven Windows symbol
sets.

Additional fonts can be downloaded to the printer RAM, optional
Flash DIMM or hard disk. PCL emulation supports both scalable and
bitmapped downloadable fonts. PostScript emulation supports only
downloadable scalable fonts. Font cards and font cartridges are not
supported.

General information 1-7

5055-xxx

Paper and media specifications

Capacity may vary and is subject to media specifications and printer
operating environment. Capacities listed are based on plain paper
at 75 g/m

Input and output configurations

2

.

Sources and
capacities

Input sources

Number of standard
sources

Optional input dra w ers 3 2 2
High-capacity feeder 1 1 1
Maximum number of

input sources

Input capacities (sheets)
Standard

Primary tray 550 550 550
Second tray N/A 550 550
Multipurpose tray 100 100 100
Total standard

capacity

Optional

500-sheet drawer 550 550 550
Heavy media tray
High-capacity feeder

Lexmark
C91x

233

666

650 1,200 1,200

1

2

Yes Yes Yes

3,000 3,000 3,000

Lexmark
C91xn

Lexmark
C91xdn

Maximum additional
drawers

1-8 Service Manual

322

5055-xxx

Sources and
capacities

Maximum input

Lexmark
C91x

Lexmark
C91xn

2,300 2,300 2,300

Lexmark
C91xdn

capacity (without
high-capacity feeder)

Maximum input

5,300 5,300 5,300
capacity and
high-capacity feeder

Output destination

Number (standard) 1 1 1

Output capacities sheets

Standard output bin 550 550 550
Face-up bin 100 100 100

Optional

Finisher

3,4

Maximum output

1,000 1,000 1,000

1,650 1,650 1,650
capacity

Other

Duplex unit Yes Yes Standard

1

The heavy media tray is supported only as Tray 1 (top).

2

A maximum of one high-capacity input drawer is supported on any model.

3

A maximum of one finisher is supported on any model.

4

The finisher requires installation of the 2 x 550-sheet drawer with the base or printer

cabinet.

General information 1-9

5055-xxx

Media size supported

Input

A4—8.27” x 11.7 in.
(210 mm x 297 mm)

A5—5.83” x 8.27 in.
(148 mm x 210 mm

JIS-B5—7.17 in.x 10.23 in.
(182 mm x 257mm)

JIS-B4—4.34 in. x 10.1 in.
(364 mm x 252 mm)

Letter—8.5 in. x 11 in.
(216 mm x 279 mm)

Legal—8.5 in. x 14 in.
(216 mm x 256 mm)

Executive—7.25 in. x 10.5 in.
(184 mm x 267 mm)

Tabloid—11 in. x 17 in.
(279.4 mm x 431.8 mm)

12 in. x 18 in.
(305 mm x 457 mm)
Lexmark C912 only

500-sheet input

XXXXX

XX XX

XXXXX

XX XX

XX XX

XX XX

multipurpose feeder

XXX

XX

XX

High-capacity feeder

Duplex

Heavy media tray

A3—11.69 in. x 16.54” in.
(297 mm x 420 mm)

1-10 Service Manual

XX XX

5055-xxx

Universal

1,2

Banner 11.69 x 36 in.
(297.2 x 914.4 mm)
Lexmark C912 only

2.75 x 5 in. to 8.5 x 14 in.
(69.85 x 127 mm to 229 x

355.6 mm)

5.83 x 7.17 in. to 8.5 x 14 in.
(148 x 182 mm to 215.9 x

355.6 mm)
7 ¾ Envelope—3.875 in. x

7.5 in. (98 mm x 191 mm)
9 Envelope—3.875 in. x 8.9 in.

(98 mm x 225.4 mm)
10 Envelope—4.125 in. x

9.5 in. (105 mm x 241 mm)
DL Envelope—4.33 in. x

8.66 in. (110 mm x 220 mm)
C4 Envelope —9 in. x 12. 75 in.

(229 mm x 324 mm)

500-sheet input

multipurpose feeder

High-capacity feeder

Duplex

Heavy media tray

X

X

X

3

X

3

X

X

X

X

X

X

C5 Envelope—6.38 in. x

9.01 in. (162 mm x 229 mm)
B5 Envelope—6.93 in. x

9.84 in. (176 mm x 250 mm)

4

Other Envelope

—

11.69 in. x 11.69 in.
(297 mm to 297 mm)

X

X

X

General information 1-11

5055-xxx

500-sheet input

multipurpose feeder

High-capacity feeder

Duplex

Heavy media tray

Media type

Paper XXXXX
Card stock X
Transparencies X

5

X
Envelopes X
Glossy paper X X
Paper labels X

6

7

XX

8

X

Output

A4—8.27 in. x 11.7 in.
(210 mm x 297 mm)

Standard output

XXXX

Bin 1

Finisher Bin 1

Finisher Bin 2

A5—5.83 in. x 8.27 in.
(148 mm x 210 mm

JIS-B5—7.17 in. x 10.23 in.
(182 mm x 257mm)

JIS-B4—14.34 in. x 10.1 in.
(364 mm x 252 mm)

Letter—8.5 in. x 11 in.
(216 mm x 279 mm)

1-12 Service Manual

XXX

XX

XXX

XXXX

5055-xxx

Legal—8.5 in. x 14 in.
(216 mm x 256 mm)

Executive—7.25 in. x 10.5 in.
(184 mm x 267 mm)

Tabloid—11 in. x 17 in.
(279.4 mm x 431.8 mm)

12 in. x 18 in.
(305 mm x 457 mm)
Lexmark C912 only

A3—11.69 in. x 16.54 in.
(297 mm x 420 mm)

Universal
Banner 11.69 x 36 in.

(297.2 x 914.4 mm)
Lexmark C912 only

2.75 x 5 in. to 8.5 x 14 in.
(69.85 x 127 mm to 229 x 355.6 mm)

5.83 x 7.17 in. to 8.5 x 14 in.
(148 x 182 mm to 215.9 x 355.6 mm)

1,2

Standard output

XXX

XXX

XXX

XXX

XXX

X

Bin 1

X

X

Finisher Bin 1

X

X

Finisher Bin 2

7 ¾ Envelope—3.875 in. x 7.5 in.
(98 mm x 191 mm)

9 Envelope—3.875 in. x 8.9 in.
(98 mm x 225.4 mm)

10 Envelope—4.125 in. x 9.5 in.
(105 mm x 241 mm)

DL Envelope—4.33 in. x 8.66 in.
(110 mm x 220 mm)

C4 Envelope—9 in. x 12.75 in.
(229 mm x 324 mm)

X

X

X

X

XX

General information 1-13

5055-xxx

Standard output

C5 Envelope—6.38 in. x 9.01 in.

Bin 1

Finisher Bin 1

XX

(162 mm x 229 mm)
B5 Envelope—6.93 in. x 9.84 in.

XX

(176 mm x 250 mm)
Other Envelope

—11.69 in. x 11.6 9 in .

XX

4

(297 mm to 297 mm)

Media type

Paper X X X X
Card stock XXX
Transparencies X X
Envelopes X X
Glossy paper X X X X
Paper labels X

1

When Universal is selected, the page is formatted for 8.5 x 14 in. (215.9 x 355.6

mm) unless the size is specified in the software application.

2

Narrow media should be loaded with the length in the feed direction (portrait).

3

A5 paper 5.83 x 8.27 in. (148 x 210 mm) is the smallest size the printer can duplex.

4

When Other Envelope is selected, the page is formatted for 8.5 x 14 in. (215.9 x

355.6 mm) unless the size is specified in the software application.

5

Maximum stack of 50 sheets; if more input is required, use Heavy Media Tray.

6

Manual feed (one sheet at a time) only; if more input is required, use Heavy Media

Tray.

7

Maximum st ack of 30 sheets; if more input is required, use Heavy Media Tray.

8

Refer to Cardstock & Label Guide for media guidelines.

X

Finisher Bin 2

1-14 Service Manual

5055-xxx

Input media types and weights

Media Weight

Standard trays

1, 2, 3

Paper–xerographic or business 16 to 28 lb bond (60 to 105 g/m2)
Specialty papers–glossy laser 80 lb book (32 lb bond) (120 g/m

Heavy media tray1

Paper–xerographic or business 28 to 47 lb bond (105 to 176 g/m
Specialty papers–glossy laser4 80 lb book (32 lb bond) (120 g/m
Transparencies–laser printer type5 47 lb bond (175 g/m2)

2

Labels–upper limit paper 48 lb bond (180 g/m

Multipurpose feeder

1

)

Paper–xerographic or business 16 to 28 lb bond (60 to 105 g/m2)
Specialty papers–glossy laser 80 lb book (32 lb bond)(120 g/m
Card stock–upper limit Index

90 lb index (44 lb bond) (165 g/m

Bristol

2

Transparencies–laser printer type 47 lb bond (175 g/m
Labels–upper limit paper 48 lb bond (180 g/m
Envelopes–sulfite, wood -free, up to

100% cotton

High-capacity feeder

1

20 to 28 lb bond

2

)

g/m

)

2

)

2,3

(75 to 105

2

)

2

)

2

)

2

)

2

)

Paper–xerographic or business 16 to 28 lb bond (60 to 105 g/m2)

1

T he duplex option supports the same weights and types as the printer, except for

transparencies, envelopes, labels, and paper less than 80 g/m2 (21.3 lb bond) or
greater than 105 g/m

2

100% cotton content maximum weight is 90 g/m2 (24 lb bond)

3

105 g/m2 (28 lb bond) envelopes are limited to 25% cotton content

4

Part numbers 12A5950 (letter) and 12A5951 (A4)

5

Part numbers 12A5940 (letter) and 12A5941 (A4)

6

Refer to Cardstock & Label Guide for media guidelines.

2

(28 lb bond).

General information 1-15

5055-xxx

Output media types and weights

Media Weight

Standard output

3

Paper–xerographic or business 16 to 28 lb bond (60 to 105 g/m2)
Specialty papers–glossy laser 80 lb book (32 lb bond) (120 g/m
Card stock–upper limit Index

90 lb index (44 lb bond) (165 g/m2)

Bristol
Transparencies–laser printer type 47 lb bond (175 g/m

2

)

Labels—upper limit paper 48 lb bond (180 g/m2)

3, 4

Bin 1

Paper–xerographic or business 16 to 28 lb bond (60 to 105 g/m2)
Specialty papers–glossy laser
Card stock–upper limit Index

1

80 lb book (32 lb bond) (120 g/m2)
90 lb index (44 lb bond) (165 g/m

Bristol

2

Transparencies–laser printer type
Labels–upper limit paper 48 lb bond (180 g/m
Envelopes–su lfite, wood -free, up to

100% cotton

Finisher bin 1

3,4

47 lb bond (175 g/m2)

20 to 28 lb bond

6,7,8

(75 to 105 g/m2)

2

)

2

)

2

)

Paper–xerographic or business 16 to 28 lb bond (60 to 105 g/m2)
Specialty papers–glossy laser
Card stock–upper limit Index

1

80 lb book (32 lb bond) (120 g/m2)
90 lb index (44 lb bond) (165 g/m

Bristol

2

Transparencies–laser printer type
Labels–upper limit paper 48 lb bond (180 g/m

47 lb bond (175 g/m2)

2

)

1-16 Service Manual

2

)

5055-xxx

Media Weight

Finisher bin 2

3, 4, 5

Paper–xerographic or business 16 to 28 lb bond (60 to 105 g/m2)

1

Part numbers 12A5950 (letter) and 12A5951 (A4).

2

Part numbers 12A5940 (letter) and 12A5941 (A4).

3

The duplex option supports the same weights and types as the printer, except for
transparencies, envelopes, labels and paper less than 80 g/m
greater than 105 g/m

4

Bin 1 represents engine side output and Finisher Bin 1 (face-up).

5

F inisher supports hole punch, job offset and stapling.

6

Finisher only supports long-edge fed envelopes wider than 5.8 in. (148 mm)—feed

direction dimension.

7

100% cotton content maximum weight is 90 g/m2 (24 lb bond).

8

105 g/m2 (28 lb bond) envelopes are limited to 25% cotton content.

2

(28 lb bond).

2

(21.3 lb bond) or

General information 1-17

5055-xxx

Input capacity by media and source

Media Stack height Capacity

500-Sheet trays

Plain paper (letter, A4,
legal, tabloid, A3)

Plain paper (letter, A4,
legal, tabloid, A3)

Glossy paper 0.6 in. (15 mm) 130 sheets

2.2 in. (5 6 mm) 550 sheets
20 lb (75 g/m

1 in. (25 mm)

240 sheets
24 lb (90 g/m

32 lb (120 g/ m

2

)

2

)

2

)

Multipurpose feeder

Plain paper

100 sheets
20 lb (75 g/m

2

)

Transparencies 50 transparencies

0.4 in. (11 mm)

Envelopes 10 envelopes
Card stock 55 sheets

90 lb index (163 g/m

Paper labels 55 sheets

up to 48 lb (180 g/m

Glossy paper (Manual) 1 sheet

32 lb (120 g/ m

2

)

High-capacity feeder

Plain paper 12.5 in. (317 mm) 3,000 sheets

20 lb (75 g/m

2

)

2

)

2

)

Heavy media tray

Plain paper 1.6 in. (40 mm) 300 sheets

32 lb (120 g/ m

Transparencies 0.8 in. (20 mm) 150 transparencies

47 lb (175 g/ m

Paper labels 1.6 in. (40 mm) 200 sheets

up to 48 lb (180 g/m

Glossy paper 1.6 in. (40 mm) 360 sheets

32 lb (120 g/ m

1-18 Service Manual

2

)

2

)

2

)

2

)

5055-xxx

Output capacity by media and source

Media Stack heights Capacity

Standard output bin

Plain paper Varies 550 sheets

20 lb (75 g/m

Glossy paper Varies 130 sheets

32 lb (120 g/m

2

)

2

)

Bin 1 and Staple Punch Finisher Bin 1

Plain paper Varies 100 sheets

20 lb (75 g/m

Transparencies Varies 50 transparencies

47 lb (175 g/m

2

)

2

)

Bin 2—Staple Punch Finisher

Plain paper 6.0 in.

(152 mm)

1,000 sheets
20 lb (75 g/m

2)

Notes:

• Performance may vary subject to media specifications and printer
operating environment

• Media at ambient environment

• All media is letter/A4, unless otherwise noted

• All paper weights are stated in bond, unless otherwise noted

General information 1-19

5055-xxx

Media guidelines

Paper

Following are media guidelines for successful printing:

• Rough, highly textured, limp or pre-curled papers will result in

lower print quality and more frequent paper feed failures.

• Colored papers, treated and preprinted papers, letterhead and

labels must be able to withstand 338° F (170° C) fusing
temperature.

• Preprinted forms and letterhead should be selected using

guidelines found in the printer User's Guide. The chemical
process used in preprinting may render some papers
unsuitable.

• Unsuitable papers include multipart forms and documents;

chemically treated papers; coated, synthetic, and thermal
papers; and preprinted papers requiring a high degree of
registration.

• Recycled paper less than 21 lb (80 g/m

unacceptable results.

2

) may cause

Envelopes

• Envelopes should be fed long edge first, with flap trailing.

• When the finisher is attached, only long-edge fed envelopes

wider than 5.8 in. (148 mm) feed direction dimension may be
used. To print smaller envelopes, the finisher must be undocked
during the job.

• If envelope wrinkling occurs, refer to the User's Guide for correct

weight, type, loading and stacking of envelopes.

• All envelopes should be new, unused and without package

damage.

• Envelopes with excessive curl or twist exceeding 0.12 in.

(6 mm), stuck together, with bent corners or nicked edges or
those that interlock should not be used.

1-20 Service Manual

5055-xxx

• Minimum weight: 20 lb (75 g/m

2

)

• The following envelopes should not be used:

– Envelopes with windows, holes, perforations, cutouts, deep

embossing or package damage

– Envelopes with metal clasps, string ties or metal folding bars
– Envelopes with exposed flap adhesive when the flap is in the

closed position

For best results, printing on new 24 lb (90 g/m
bond envelopes is recommended.

Note: Under high-humidity conditions (over 60%) the envelopes
may seal during printing.

Transparencies

Use letter (p/n 12A5940) or A4 (p/n 12A5941) only

Labels

Labels should be selected using guidelines found in the User's
Guide or the Cardstock and Label Guide, and tested for

acceptability.

Lexmark glossy paper

2

) sulfite or 25% cotton

• Use letter (p/n 12A5950) or A4 (p/n 12A5951) only

• Glossy paper is only supported from Tray 1, Multipurpose

Feeder, and Heavy Media Tray.

Print area

Printable area for the printer is to within 0.16 in. (4.2 mm) of all
edges of the media (except envelopes).

General information 1-21

5055-xxx

Options and features

Lexmark C91x printers support only Lexmark C91x paper-handling
options. These options are not compatible with any other Lexmark
printer.

• 550-Sheet drawer—(includes 550-sheet tray and support unit)

installs beneath the printer and holds approximately 550 sheets
of 20 lb paper. Multiple optional drawers (up to 3) are supported
simultaneously.

• High-capacity feeder—is designed to provide an additional

input tray (Tray 3 or T ray 5, depending on the configuration) with
a total capacity of 3,000 sheets (plain paper—letter or A4—20
lb (75 g/m
and attaches to the right side of the printer.

• Heavy-media tray—is intended for special media such as

transparencies, labels and glossy paper. This is supported only
as Tray 1 (top drawer location).

• Duplex unit—offers two-side printing and is designed to

complement the Lexmark C91x printers.

• Finisher—offers stapling, hole punching, offset stacking and an

additional output bin. Two models are available. 3- or 4-hole left­edge hole punching is available. The single staple position is the
upper left corner. The finisher can support up to 1,100 sheets of
unstapled, unpunched media. For stapled media, the output bin
supports up to 30 stapled sets or 1,000 sheets. The stapler can
staple a maximum of 30 sheets per set. Each printer can
support a single finisher.

• Printer cabinet—is customer installable and attaches so the

printer sits on top of the printer stand. The printer cabinet raises
the printer to the correct height for use with the optional finisher
and high-capacity feeder. The printer cabinet and high-capacity
feeder can be installed at the same time.

– C91x – 1 optional drawer
– C91xn or dn – no optional drawers

2

). The high-capacity feeder is customer installable

1-22 Service Manual

5055-xxx

• Printer base—is customer installable and attaches so the

printer sits on top of the printer base. If used with two optional
550-sheet drawers, the printer base raises the printer to the
correct height for use with the optional finisher and high­capacity feeder. The printer base and high-capacity feeder can
be installed at the same time.

– C91x –3 optional drawers
– C91xn and C91xdn –2 optional drawers

Connectivity

Standard

• Lexmark C91x

– Bidirectional parallel and USB

• Lexmark C91xn and Lexmark C91xdn

– 10/100BaseTX Ethernet and USB

Note: USB is supported only under Windows 98 SE, Windows Me,
Windows XP, Windows 2000 operating systems, Sun's Sun Ray
appliances running Sun Ray Server code version 1.2 or later, Sun
Blade workstations and Apple Macintosh iMac computer with
Operating System 8.6 or higher. A USB cable is included with this
card.

Optional internal local connections

• Tri-Port Adapter (RS-232/RS-422 Serial, LocalTalk and Infrared)

• RS-232C Serial/Parallel-C Interface Card

General information 1-23

5055-xxx

Network connections

Internal network connections

• Lexmark MarkNet N2000 Serie s Internal Print Servers

– MarkNet N2000t for Token-Ring attachment
– MarkNet N2001e for Ethernet 10BaseT/100BaseTX
– MarkNet N2002e for Ethernet 10BaseT/10Base2

• Lexmark MarkNet N2003 Series Internal Fiber Print Servers,

including:

– MarkNet N2003fx SC
– MarkNet N2003fx MTRJ

External network connections

• MarkNet X2000 Series External Print Servers

– MarkNet X2011e (1-port) for Ethernet 10BaseT/100BaseTX
– MarkNet X2012e (1-port) for Ethernet 10BaseT/100BaseTX,

10BaseT/10Base2

– MarkNet X2031e (3-port) for Ethernet 10BaseT/100BaseTX
– MarkNet X2030t (3-port) for Token-Ring attachment

Standard Ethernet and MarkNet compatibility

The standard Ethernet connection, MarkNet N2000 series and
MarkNet N2003 series internal and MarkNet X2000 series external
print servers support NetPnP 7.0 or later on Windows NT 4.0,
Windows 2000 and Windows XP systems.

The Ethernet and Token-Ring print servers and the standard
Ethernet connection support the following protocols:

• TCP/IP

• Novell (IPX/SPX including NetWare Directory Services)

• AppleTalk

• LexLin k (DLC/LLC)

1-24 Service Manual

5055-xxx

The TCP/IP standard set of application services is supported,
including DHCP, WINS, SNMP (industry standard printer MIB), http,
lpr/lpd, ftp, tftp, ping, finger, telnet, bootp and rarp. The following
protocols are also supported:

• IPP: Internet Printing Protocol

• SLP: Service Location Protocol

• NTP: Network Timing Protocol

Printers with standard Ethernet, MarkNet N2000 series and MarkNet
N2003 series internal print servers and MarkNet X2000 series
external print servers support a resident Web page with Microsoft
Internet Explorer 4.0 or later and Netscape Navigator 4.5 or later for
Windows 95, Windows 98, Windows Me, Windows 2000, Windows
XP or Windows NT. The remote operator panel is available using the
standard Ethernet connection, MarkNet N2000, MarkNet N2003 or
MarkNet X2000 Series external print servers installed in or used
with a Lexmark C91x pr in ter.

Data streams

• PostScript 3 Emulation

• Hewlett-Packard Company PCL 6 Emulation

Operating systems

These printers are compatible with applications running under the
previously mentioned operating systems for either local or network
connections.

General information 1-25

5055-xxx

Power and electrical specifications

Power requirements

Average nominal power requirements for the base printer
configuration (110 volt). Power level are shown in watts.

Printing states (average
power)

Off 0 W * *
Average power while printing

Continuous mono
Continuous color

Average power while printing

Continuous mono
Continuous color

Average power while printing

Continuous mono
Continuous color

* 0 W. Always active and drawing voltage.

Non­network

400 W
290 W

13 W

125 W

11 A

6 A

Network

400 W
290 W

14 W

125 W

11 A

6 A

Electrical specifications

Low volta ge models

• 110 to 127 V at 50 to 60 hertz (Hz) nominal

• 99 to 135 V, extreme

Duplex/
network

410 W
300 W

15 W

125 W

11 A

6 A

High voltage models

• 220 to 240 V at 50 to 60 hertz (Hz) nominal

• 198 to 254 V, extreme

Note: Using a 220 to 110 power converter with the 110 V printer is
not recommended.

1-26 Service Manual

5055-xxx

Operating clearances

Dimension Measurement Notes

Left side 13 in. (330 mm) Clearance on the left side

Right
side

Front 26 in. (660 mm)
Rear 5 in. (127 mm)
Top 9 in. (229 mm) With the high-capacity feeder

C91x(n) 6 in. (152 mm) Clearance on right side should
C91xdn 13 in. (330 mm)

should be 9 in. (228.6) with
the finisher attached.

be 30 in. (762 mm) with the
high-capacity f ee der attached.

Clearance on the right side
should be 13 in. (330 mm)
with the duplex attache d, b u t
not the high-capacity feeder.

or finisher attached, the top
clearance needs to be 43.8 in.
(1,113 mm).

Environment

Printer temperature and humidity

Operating

• Temperature: 60 to 90° F (15.6 to 32.3° C)

• Relative humidity: 8 to 80%

• Maximum wet bulb temperature: 73° F (22.8° C)

• Altitude: 10,000 ft. (0 to 3,048 meters)

• Atmospheric pressure: 74.6 kPa

Power Off

• Temperature: 50 to 110° F (10 to 43.3° C)

• Relative humidity: 8 to 80%

• Maximum wet bulb temperature: 80.1° F (26.7° C)

• Altitude: 10,000 ft. (0 to 3,048 meters)

General information 1-27

5055-xxx

Shipping printer without print cartridges

• Temperature: 0 to 140° F (0.6 to 60° C)

• Relative humidity: 5 to 100%

• Maximum wet bulb temperature: 85° F (30° C)

• Altitude: 34,000 ft. (10,300 meters)

Storing printer without print cartridges

• Temperature: 0 to 140° F (0.6 to 60° C)

• Relative humidity: 5 to 80%

• Maximum wet bulb temperature: 85° F (30° C)

• Altitude: 34,000 ft. (10,300 meters)

Shipping supply items

• Temperature: -40 to 104° F (-40 to 40° C)

• Relative humidity: 5 to 100%

• Maximum wet bulb temperature: 80° F (27° C)

Storing supply items

• Temperature: 0 to 104° F (0.6 to 40° C)

• Relative humidity: 5 to 80%

• Maximum wet bulb temperature: 80° F (27° C)

In some cases, performance specifications (such as paper OCF or
EP cartridge usage) are specified to be measured at an ambient
condition.

1-28 Service Manual

5055-xxx

Maintenance approach

The diagnostic information in this manual leads you to the correct
field replaceable unit (FRU) or part. Use the error code charts,
symptom index, and service checks to determine the symptom and
repair the failure. The removals in the repair information chapter may
help you identify parts.

• “Printer messages” on page 2-4

• “Symptom table” on page 2-63

• “Service checks” on page 2-68

• “Repair information” on page 4-1

After you complete the repair, perform tests as needed to verify the
repair. See “Diagnostic aids” on page 3-1.

Standard inspection and cleaning procedure

• Switch off printer power, and disconnect the AC power cord

from the electrical outlet.

• Remove and inspect the photodevelopers and toner cartridges,

shielding them from strong light.

• Inspect the interior of the printer, removing foreign matter such

as paper clips, staples, pieces of paper or transparencies, paper
dust, hair, oil, grease, or toner.

• Clean the printer interior using a lint-free cloth, dampened

slightly with cold water. Do not use solvents or chemical
cleaners to clean the printer interior.

• Use only the specified oil or lubricant on printer parts (some

service parts are lubricated at the factory).

• Inspect and, if necessary, clean all rubber/plastic and D rolls

with a lint-free cloth, dampened slightly with cold water. Dry the
rolls with a lint-free cloth.

• While cleaning, inspect the interior of the printer for damaged

wires, loose connections, toner leakage, loose springs, and
damaged or worn parts.

• Be sure the printer is on a single, flat, strong table or desk top.

General information 1-29

5055-xxx

• Inspect all supplies (OCR, cartridges, photodevelopers/toner

cartridges, belts, fuser CRUs) and paper sources (cassettes,
trays, feeders, duplex drawers, finishers, mailbox trays) for
obvious damage and proper installation (paper under corner
bucklers, paper guides not too tight). Inspect for correct media
usage (paper, transparencies, labels).

• Print a Demo page.

• If additional paper sources are installed, print a Demo page

from each of these, (if possible).

Note: Failure to print from an additional tray or feeder may imply
one or more pins are bent in the mating connector.

Return parts

Engineering periodically analyzes returned parts for failure modes.
Include a printed test (DEMO) page, before and after the repair, and
tag any returnable parts with a description of the failure.

Service recommendations

Before leaving the printer check the following:

• Be sure printer is on a flat, level, strong tabletop or level floor.

This is very important for color printers that use belts. Check
and set registration as necessary.

• Shake all cartridges and be sure they are correctly installed and

fully seated.

• While the cover is open, wipe any residual toner from the LEDs

using a lint free cloth.

• If you have serviced the finisher option, and in the process

pulled it away from the printer during repair, ensure that it is
properly aligned with the printer.

1-30 Service Manual

5055-xxx

Tools

The removal and adjustment procedures require the following tools
and equipment:

• Magnetic tip Phillips screwdrivers, large and small

• Flat-blade screwdrivers

• Analog volt ohmmeter (a digital volt ohmmeter may also be

used)

• Needle nose pliers

• Tweezers, C-ring pliers

• Magnifier (20 times or highe r)

• 6-angle wrench (1.5 mm)

When you make voltage readings, always use frame ground unless
another ground is specified.

General information 1-31

5055-xxx

Serial number, configuration ID, and part number

Open the front door. The serial number, configuration ID, and part
number are located as shown. The serial number is also on the
menu settings page you can print from the Tests Menu.

Serial Number

Config ID

P/N

1-32 Service Manual

5055-xxx

Abbreviations

ASIC Application-specific integrated circuit
CSU Customer setup
DRAM Dynamic random access memory
EP Electrophotographic process
EPROM Erasable programmable read-only memory
ESD Electrostatic discharge
FRU Field replaceable unit
HVPS High voltage power supply
LAN Local area network
LASER Light amplification by stimulated emission of

radiation
LCD Liquid crystal display
LED Light-emitting diode
LVPS Low voltage power supply
NVRAM Nonvolatile random access memory
OEM Original equipment manufacturer
PICS Problem isolation charts
PIXEL Picture element
POR Power-on reset
POST Power-on self test
PQET Print quality enhancement technology
RIP Raster image processor
ROS Read-only storage
SRAM Static random access memory
UPR Used parts replacement
V ac Volts alternating current
V dc Volts direct current

General information 1-33

5055-xxx

1-34 Service Manual

5055-xxx

2. Diagnostic information

The diagnostic information in this chapter leads you to the failing
part. Before you replace an entire assembly, determine if just the
defective part is available in the parts catalog. Use the error code
tables, symptom table, service checks and the diagnostic aids
chapter to determine the symptom and repair the failure. The
removal procedures in the Repair information chapter may help you
identify parts. After you complete the repair, perform the appropriate
tests to verify the repair.

If an error is displayed, locate it in the “Service error message

tables” on page 2-4, the “Attendance messages” on page 2-34,

or the “Symptom table” on page 2-63 and take the appropriate
action.

If an error message appears while you are working on the printer, go
to the error message table and take the indicated action.

Adjustments and procedures following parts replacement

Note: When troubleshooting, or prior to making any adjustment to

print quality, always be sure:

• The printer is installed on a level rigid surface.

• The photodevelopers are never exchanged. Do not exchange a

black photodeveloper for a color photodeveloper, as they have
different surface phase counts.

• The Alignment Page is used when adjusting print registration.

Whenever you replace any of the following parts be sure to perform
the required adjustments or procedures. The adjustments are in the
Repair information and Diagnostic aids chapters.

Diagnostic information 2-1

5055-xxx

Printer controller board/printer control EPROM (U5)

If you replace the printer controller board, remove EPROM (U5) and
install it on the new board. Also check the printhead alignment.

If you change the EPROM, record and input the following items
using the diagnostic mode following EPROM replacement:

• LED Printhead Light Quantity

• Printer Alignment (X, Y, and Theta)

• All Counters

RIP controller board

If you replace the RIP controller board, move the solid state drive,
memory, and option cards from the old card to the new one. After
replacing the RIP controller board, it is necessary to type in the
following items in Diagnostic Mode:

• Set Serial Number

• Configuration ID

Transfer belt

If you replace the transfer belt, check the printer alignment (X, Y, and
Theta), adjusted in diagnostic mode.

LED printhead controller board or LED printhe ad

If you replace the LED printhead controller board or LED printhead,
check and adjust the following items in diagnostic mode:

• LED Printhead Light Quantity

• Printer Alignment (X, Y, and Theta)

2-2 Service Manual

5055-xxx

Start

Initial check

Before you start troubleshooting, check the following:

Installation environment

• The power supply line voltage is plus or minus 10% of the rated

line voltage.

• The machine is securely installed on a level surface in a well-

ventilated place.

• The room temperature is between 10 and 32°C (50 and 90°F)

and the relative humidity between 20 and 80%.

• Avoid sites generating ammonia gas, high temperature, high

humidity (near water faucets, kettles, humidifiers), cold spaces,
near open flames, and dusty areas.

• Avoid sites exposed to direct sunlight.

Print paper checks

• Use the recommended paper for this printer.

• Paper dampness. Make a trial print with paper from a newly

opened package, and check the result.

Diagnostic information 2-3

5055-xxx

Printer messages

The printer displays three types of messages: service messages,
status messages, and attendance messages. Service messages
indicate a problem that requires a service technician. Status
messages provide information about the current state of the printer,
requiring no action. Attendance messages alert the operator to
printer problems that require operator intervention.

Service error message tables

900 - Unrecoverable Software Error

910 Service
Motor Error

910 - Drive Motor Error

Step Questions/actions Yes No

1 Are connectors CN1 and

CN5 on the motor drive
board connected properly?

2 Is connector CN33 on the

printer controller board
connected properly?

3 Did replacement of the

motor drive board solve the
problem?

4 Did replacement of the

printer controller board
solve the probl em ?

5 Did replacement of the

supplies solve the problem?

2-4 Service Manual

Go to step 2. Connect CN1

and CN5.

Replace th e
motor drive
board and go to
step 3.

Problem solved. Replace the

Problem solved. Replace all the

Problem solved. Replace the

Connect CN33.

printer controller
board and go to
step 4.

supplies and go
to step 5.

drive motor.

5055-xxx

911 - Paper Exit Motor Error

Step Questions/actions Yes No

1 Is connector CN4 on the

printer controller board
securely connected?

2 Did replacement of the

paper exit motor solve the
problem?

Replace th e
paper exit motor
and go to step 2.

Problem solved. Replace the

Plug the
connector in
securely.

printer controller
board.

912 - High-Capacity Feed Motor Error

Step Questions/actions Yes No

1 Is connector CN40 on the

printer controller board
securely connected?

Go to “High-

capacity feeder
(HCF) service
check” on
page 2-70.

Plug the
connector in
securely.

917 - RIP Fan Error

917 Service
Fan Error

Step Questions/actions Yes No

1 Is connector J5 on the RIP

board connected properly?

2 Is 24 V dc present bet ween

pins 1 and 3 of connector
J5 on the RIP board?

3 Is 24 V dc present bet ween

pin 80 of the RIP/pri nter
controller and ground?

Go to step 2. Properly connect

J5.

Replace the RIP
fan.

Replace the RIP
board.

Go to step 3.

Replace the
printer controller
board.

Diagnostic information 2-5

5055-xxx

918 - Main Unit Fan Error

Step Questions/actions Yes No

1 Is +24 V present between

pins 1 and 3 on connectors
CN17 (upper left fan) and
CN5 (upper right f an) on the
printer controller board?

Replace th e
failing fan.

Replace the
printer controller
board.

919 - Power Supply Fan Error

Step Questions/actions Yes No

1 Is +24 V present between

pins 1 and 3 of connector
CN6 on the printer
controller board?

Replace th e
power supply
fan.

Replace the
printer controller
board.

92x Service
Fuser Error

920 - Fuser Error—Fuser Heater Trouble

Step Questions/actions Yes No

1 Replace the fuser. Did this

fix the problem?

2 Did replacing power supply

2 fix the problem?

2-6 Service Manual

Problem solved. Return the fuse r,

replace the
power supply 2
and go to step 2.

Problem solved. Return power

supply 2 and
replace the
printer controller
board.

5055-xxx

923 - Upper Fuser Thermistor Open Error

Step Questions/actions Yes No

1 Is connector CN44 on the

printer controller board
connected properly?

2 Is error 923 displayed? Power off and

3 Power the printer off and

short pins 1 and 4 of CN44
and power on. Is error 923
displayed?

Disconnect
CN44 and turn
the printer on.
Go to step 2.

reconnect CN44.
Go to step 3.

Replace th e
fuser.

Plug the
connector in
securely.

Replace the
printer controller
board.

Replace the
printer controller
board.

924 - Lower Fuser Thermistor Open Error

Step Questions/actions Yes No

1 Turn off the printer and

reinstall the fuser, making
sure it clicks into place.
Turn on the printer.

Did this resolve the
problem?

Problem solved Go to step 2

2 Is connector CN44 on the

printer controller board
connected properly?

3 Is error 924 displayed? Turn the printer

4 Turn off the printer and

short pins 8 and 11 of
CN44. Turn on the printer.
Is error 924 displayed?

Disconnect
CN44 and turn
the printer on.
Go to step 3.

off and
reconnect CN44.
Go to step 4.

Replace th e
fuser.

Diagnostic information 2-7

Plug the
connector in
securely.

Replace the
printer controller
board.

Replace the
printer controller
board.

5055-xxx

925 - HVU Error

Step Questions/actions Yes No

1 Has the high voltage power

board (HVU) been
removed/replaced?

2 Is connector CN42 on the

printer controller board
connected properly?

3 Did replacing the printer

controller board fix the
problem?

Inspect the
secondary card
on the high
voltage board
(HVU) for a
broken
component
(Q906). Replace
the high voltage
board (HVU) if
necessary.

Replace th e
printer controller
board.
Go to step 3.

Problem solved. Replace the high

Go to step 2

Plug the
connector in
securely.

voltage power
board (HVU).

2-8 Service Manual

5055-xxx

926(K), 927(C), 928(Y), 929(M) - Toner Sensor Error

92x Service
Toner Sensor

Step Questions/actions Yes No

1 Is the toner cartridge the

correct type for the printer?

2 Is the toner cartridge

encoder wheel dirty?

3 Replace the t one r c artridge

for the color with the error.
Did this fix the problem?

4 Test the sensors.

While actuating the sensor,
does the voltage fluctuate
between 0 V and +5 V
between pins 1 and 2 on
connectors CN22(K),
CN21(Y), CN18(M), and
CN19(C) on the printer
controller board?

Go to step 2. Recommend the

customer
replace the
cartridge with
the correct type.

Clean the
encoder wheel
and toner
sensor.

Problem solved. Go to step 4.

Replace th e
printer controller
board.

Go to step 3.

Replace the
affected toner
sensor.

Diagnostic information 2-9

5055-xxx

930 - Yellow Printhead Error

930 Service
Printhead Error

Step Questions/actions Yes No

1 Check to ensure that the

cables between the LED
printhead and the printhead
controller board as well as
the cables between the
printhead controller board
and the printer controller
board are properly
connected.

Are they properly
connected?

2 For serial number

XX–0XXXX: Is fuse 5 on
the printhead control board
open?

3 Did replacement of the

printhead controller board
correct the problem?

4 For serial number

XX–1XXXX and above:

Replace the LED printhead
for the affected color.

If you have a
printer with serial
number
XX–0XXXX, go
to step 2.

If you have a
printer with serial
number
XX–1XXXX and
above, go to
step 4.

Replace th e
printhead control
board, cables
(CL13, CL24),
and LED
printhead.

Problem solved. Replace the

Problem solved. Replace the

Properly connect
the cables.

Replace the
printhead
controller board
and go to step 3.

printer controller
board.

printhead
controller board
and go to step 5.

Did this resolve the
problem?

5 Did replacement of the

printhead controller board
resolve the problem?

2-10 Service Manual

Problem solved. Replace the

printer controller
board.

5055-xxx

931 - Magenta Printhead Error

Step Questions/actions Yes No

1 Check to ensure that the

cables between the LED
printhead and the print head
controller board as well as
the cables between the
printhead controller board
and the printer controller
board are properly
connected. Are they
properly connected?

2 For serial number

XX–0XXXX: Is fuse 6 on
the printhead control board
open?

3 Did replacement of the

printhead controller board
correct the problem?

4 For serial number

XX–1XXXX and above:

Replace th e LED printhead
for the affected color.

If you have a
printer with serial
number
XX–0XXXX, go
to step 2.

If you have a
printer with serial
number
XX–1XXXX and
above, go to
step 4.

Replace th e
printhead control
board, cables
(CL13, CL24),
and LED
printhead.

Problem solved. Replace the

Problem solved. Replace the

Properly connect
the cables.

Replace the
printhead
controller board
and go to step 3.

printer controller
board.

printhead
controller board
and go to step 5.

Did this resolve the
problem?

5 Did replacement of the

printhead controller board
resolve the problem?

Problem solved. Replace the

printer controller
board.

Diagnostic information 2-11

5055-xxx

932 - Cyan Printhead Error

Step Questions/actions Yes No

1 Check to ensure that the

cables between the LED
printhead and the printhead
controller board as well as
the cables between the
printhead controller board
and the printer controller
board are properly
connected.

Are they properly
connected?

2 For serial number

XX–0XXXX: Is fuse 3 on
the printhead control board
open?

3 Did replacement of the

printhead controller board
correct the problem?

4 For serial number

XX–1XXXX and above:

Replace the LED printhead
for the affected color.

If you have a
printer with serial
number
XX–0XXXX, go
to step 2.

If you have a
printer with serial
number
XX–1XXXX and
above, go to
step 4.

Replace th e
printhead control
board, cables
(CL13, CL24),
and LED
printhead.

Problem solved. Replace the

Problem solved. Replace the

Properly connect
the cables.

Replace the
printhead
controller board
and go to step 3.

printer controller
board.

printhead
controller board
and go to step 5.

Did this resolve the
problem?

5 Did replacement of the

printhead controller board
resolve the problem?

2-12 Service Manual

Problem solved. Replace the

printer controller
board.

5055-xxx

933 - Black Printhead Error

Step Questions/actions Yes No

1 Check to ensure that the

cables between the LED
printhead and the print head
controller board as well as
the cables between the
printhead controller board
and the printer controller
board are properly
connected.

Are they properly
connected?

2 For serial number

XX–0XXXX: Is fuse 4 on
the printhead control board
open?

3 Did replacement of the

printhead controller board
correct the problem?

4 For serial number

XX–1XXXX and above:

Replace th e LED printhead
for the affected color.

If you have a
printer with serial
number
XX–0XXXX, go
to step 2.

If you have a
printer with serial
number
XX–1XXXX and
above, go to
step 4.

Replace th e
printhead control
board, cables
(K13, K24), and
LED printhead.

Problem solved. Replace the

Problem solved. Replace the

Properly connect
the cables.

Replace the
printhead
controller board.

printer controller
board.

printhead
controller board
and go to step 5.

Did this resolve the
problem?

5 Did replacement of the

printhead controller board
resolve the problem?

Problem solved. Replace the

printer controller
board.

Diagnostic information 2-13

5055-xxx

934 - Color Drum Sensor Error

934 Service
Drum Sensor

Step Questions/actions Yes No

1 Is connector CN28

connected properly?

2 Clean the color drum

sensor LED.
Did this fix the problem?

3 Did replacing the color

drum sensor fix the
problem?

Go to step 2. Plug the

connector in
securely.

Problem solved. Replace the

color drum
sensor.
Go to step 3.

Problem solved. Replace the

printer controller
board.

935 - Black Drum Sensor Error

Step Questions/actions Yes No

1 Is connector CN27

connected properly?

2 Clean the black drum

sensor LED. Did this fix the
problem?

Go to step 2. Plug the

connector in
securely.

Problem solved. Replace the

black drum
sensor.
Go to step 3.

3 Did replacing the black

drum sensor fix the
problem?

2-14 Service Manual

Problem solved. Replace the

printer controller
board.

5055-xxx

936 - 939 Cassette Error

936 Service
Paper Option

Step Questions/actions Yes No

1 Are connectors CN35 and

CN36 on the printer
controller board connected
properly?

Replace th e
printer controller
board.

Plug the
connector in
securely.

940 - High-Capacity Feed Sensor Error

Step Questions/actions Yes No

1 Is connector CN40 on the

printer controller board
connected properly?

Go to “High-

capacity feeder
(HCF) service
check” on
page 2-70.

Plug the
connector in
securely.

941 - High-Capacity Feed Tray Error

Step Questions/actions Yes No

1 Is connector CN40 on the

printer controller board
connected properly?

Go to “High-

capacity feeder
(HCF) service
check” on
page 2-70.

Plug the
connector in
securely.

Diagnostic information 2-15

5055-xxx

942 - Duplex Error

942 Service
Duplex

Step Questions/actions Yes No

1 Is connector CN37 on the

printer controller board
connected properly?

Replace th e
printer controller
board.

Plug the
connector in
securely.

945 - Engine Flash Error

945 Service
Engine Flash

Reflash the engine code.

946 - Printer/Printhead Controller Board Communication Error

946 Service
Communication

Step Questions/actions Yes No

1 Make sure all printhead

LED EPROMS are pr esent
on the printhead controller
board.

Are all the EPROMS
present?

Go to step 2 Install the

EPROM(s)
included with
printhead FRU.

2 Replace the printhead

controller board.
Did this fix the problem?

2-16 Service Manual

Problem solved. Replace the

printer controller
board.

5055-xxx

947 - Finisher Communication Error

Step Questions/actions Yes No

1 Are the finisher to printer

interface cable and power
cable properly connected?

2 Replace the interf ace cable .

Did this resolve the
problem?

3 Did finisher control board

replacement resolve the
problem?

Go to step 2. Properly connect

the cable.

Problem solved. Replace the

control finisher
board. Go to
step 3.

Problem solved. Replace the

printer control
board.

948 - Machine ID Error

948 Service
Machine ID

Step Questions/actions Yes No

1 Turn the printer off and wait

30 seconds. Turn the printer
on. Did this fix the problem?

Problem solved. Verify proper

installation of the
EPROMs on
both the printer
controller board
and the
printhead
controller board.
Go to step 2.

2 Are the EPROMs installed

correctly?

3 Did replacing the printer

controller board fix the
problem?

Replace th e
printer controller
board.
Go to step 3.

Problem solved. Replace the

Install the
EPROMs
correctly.

printhead
controller board.

Diagnostic information 2-17

5055-xxx

949 - Tray (x) Comm

Step Questions/actions Yes No

1 Replace the printer

controller board.
Does this fix the problem?

Problem solved. Replace the

expansion
feeder control
board for trays
2-5.

If the problem is
with the high­capacity paper
feeder, replace
the HCPF board.

950 - Pr Control Board

Replace the printer controller board.

952 - NVRAM Chip Failure

952 Service
NVRAM Failure

Step Questions/actions Yes No

1 Make sure the 80-pin RIP

printer controller cable is
not broken or damaged.

Replace th e
cable.

Go to step 2.

Is the cable broken or
damaged?

2 Is EPROM U5 present on

the printer controller board?

954 - NVRAM CRC Failure

Replace the RIP board.

2-18 Service Manual

Replace th e
printer controller
board.

Install EPROM
U5

5055-xxx

955 - Code CRC

955 Service
Code CRC <loc>

Replace the RIP board.

956 - Processor Failure

956 Service
System Board

Replace the RIP board.

957 - ASIC Failure

Replace the RIP board.

958 - NAND Failure

958 Service
NAND Failure

Replace the RIP board.

960 - RAM Slot 1 Bad

960 Service
RAM Memory Error

Replace the RAM card or the RIP board.

961 - RAM Slot 2 Bad

Replace the RAM card or the RIP board.

962 - RAM Slot 3 Bad

Replace the RAM card or the RIP board.

964 - Emulation Error

964 Service
Emulation Error

Replace the DLE board. If this does not fix the problem, replace the
RIP board.

Diagnostic information 2-19

5055-xxx

970 - Standard Network Error

970 Service
Standard Network

970 Service
Network Card x

Check the network card in slot x on the RIP card.

975 - Unrecognizable Network Port

Software error.

976 - Unrecoverable Software Error in Network Port

Software error. Go to the “Options service check” on page 2-98
and refer to the network card option section.

978 - Bad Checksum While Pro gramming Net work Card

Software error.

979 - Flash Parts Failed While Programming Network Port

Reflash network port.

2-20 Service Manual

5055-xxx

980 - Face Up/Down Switching Error

980 Service
Switch Error

Check Area
B

Step Questions/actions Yes No

1 Does the F ac e Up/ Down

(FU/FD) deflector move at
all during power up?

2 Manually operate the FU/

FD deflector .
Does it properly lock int o

position when manually
operated?

3 Is there continuity on the

FU/FD deflector solenoid
between pins 1 and 2 of
CN14 on the printer
controller board?

4 Make sure that the FU/FD

deflector pivot arm is in the
proper position.

Is it in the proper position
with its operating linkage?

5 Is fuse 1 on the printer

controller board open?

Go to step 2. Go to step 3.

Go to step 3. Go to step 4.

Go to step 5. Replace the FU

exit assembly.

Replace th e FU
exit assembly.

Replace th e
printer controller
board and drum
eraser cable
assembly.

Place the FU/FD
pivot arm in the
proper position.

Replace the
printer controller
board.

Diagnostic information 2-21

5055-xxx

981 - Belt Up/Down Sensor Error

981 Service
Switch Error

Step Questions/actions Yes No

1 Is engine code level 41D or

above.

2 Are connectors CN409 and

CN407 on the sensor board
connected properly?

3 Are connectors CN26 and

CN29 on the printer
controller board connected
properly?

4 Remove the transfer belt.

Verify the belt up/down
sensor actuator flag is
properly installed, not
broken, and in the proper
position. Make sure the
sensor is fully snapped in
place and that the sensor
connector is fully seated.
Are these items correct?

Go to step 2. Update the

printer with code
lev el 41D or
above.
If this dies not
resolve the
problem,
continue with
step 2.

Go to step 3. Plug the

connectors in
securely.

Go to step 4. Plug the

connector in
securely.

Go to step 5. If the sensor is

out of position or
disconnected,
properly install
the sensor and
securely connect
the sensor
connector.

If the sensor
actuator flag is
broken, replace
the belt up/down
changing shaft.

5 Clean the b elt up/down

sensor. Does this fix the
problem?

2-22 Service Manual

Problem solved. Go to step 5.

5055-xxx

Step Questions/actions Yes No

6 Test the sensor. While

actuating the sensor, does
the voltage fluctuate
between 0 V and +5 V
between pins 7 and 8 of
connector CN29 on the
printer controller board?

7 Did replacing the belt up/

down clutch fix the
problem?

Replace th e belt
up/down clutch.
Go to step 7.

Problem solved. Replace the

Replace the belt
up/down sensor.

printer controller
board.

982 - Sensor Controller Error

982 Service
Sensor Control

Step Questions/actions Yes No

1 Turn the printer off and wait

30 seconds. Turn the printer
on.

Is error 982 displayed?

Replace the
printer
controller
board.

Problem
solved.

Diagnostic information 2-23

5055-xxx

983 - Black Gear Sensor Error

983 Service
Gear Sensor

Step Questions/actions Yes No

1 Is connector CN20 on the

printer controller board
connected properly?

2 Check the cable running to

CN20 for damage.
Is the cable damaged?

3 Clean the gear sensor.

Does this correct the
problem?

4 Replace the sensor card.

Did this resolve the
problem?

Go to step 2. Plug the

connector in
securely.

Replace th e
cable.

Problem solved. Go to step 4.

Problem solved. Replace the

Go to step 3.

drive unit.

984 - Yellow Gear Sensor Error

Step Questions/actions Yes No

1 Is connector CN20 on the

printer controller board
connected properly?

2 Check the cable running to

CN20 for damage.
Is the cable damaged?

Go to step 2. Plug the

connector in
securely.

Replace th e
cable.

Go to step 3.

3 Clean the gear sensor.

Does this correct the
problem?

4 Replace the sensor card.

Did this resolve the
problem?

2-24 Service Manual

Problem solved. Go to step 4.

Problem solved. Replace the

drive unit.

5055-xxx

985 - Transfer Belt Thermistor Error

985 Service
Thermistor Error

Step Questions/actions Yes No

1 Are connectors CN407 and

CN408 on the sensor board
connected properly?

2 Is connector CN29 on the

printer controller board
connected properly?

Go to step 2. Plug the

connector in
securely.

Replace th e
transfer b elt unit.
If the problem
remains, replace
the printer
controller board.

Plug the
connector in
securely.

986 - Transparency (OHP) Sensor Error

986 Service
OHP Sensor

Step Questions/actions Yes No

1 Are connectors CN15 (light

emitting) and CN7 (light
receiving) on the printer
controller board connected
properly?

2 Test the sensor. While

actuating the sensor, does
the voltage fluctuate
between 0 V and +5
between pins 2 and 3 of
connector CN7 of the
printer controller board?

Go to step 2. Plug the

connector in
securely.

Replace th e
printer controller
board.

Replace the
upper and lower
transparency
sensor.

Diagnostic information 2-25

5055-xxx

992 - Temperature/Humidity Sensor Error

Step Questions/actions Yes No

1 Is connector CN3 on the

printer controller board
connected properly?

2 Replace the temperature

and humidity sensor (a
component of the paper
feed solenoid assembly).
Did this fix the problem?

993 CPU Error

Replace the printer controller board.

Go to step 2. Plug the

connector in
securely.

Problem solved. Replace the

printer controller
board.

2-26 Service Manual

5055-xxx

994 - Density Sensor Error

Step Questions/actions Yes No

1 Is the front door fully

closed?

2 Is the density sensor

actuator stuck in place?

3 Are connectors CN406 and

CN407 on the sensor board
connected properly?

4 Is connector CN29 on the

printer controller board
connected properly?

5 Did replacing the density

sensor fix the problem?

Go to step 2. Close the front

door.

Release th e
density sensor
actuator.

Go to step 4 Plug the

Replace th e
density sensor.
Go to step 5.

Problem solved. Replace the

Go to step 3.

connector in
securely.

Plug the
connector in
securely.

printer controller
board.

Diagnostic information 2-27

5055-xxx

995 - Finisher Main Feed Motor abnormal

995 Service
Finisher

Step Questions/actions Yes No

1 Is there jammed paper or

other obstructions in the
paper path?

2 Check to ensure the

connector PJ6 on the
finisher control board and
the feed motor assembly
cable are properly
connected. Are the cables
properly connected?

3 Make sure the finisher set

switch is activated.
Measure for +24 V dc
(±10%) between pins 7 an d
8 and +5 V dc (±10%)
between pins 7 and 6 on
the feed motor assembly
cable connector CN1. Is
either voltage missing?

4 Disconnect the feed motor

assembly ca b le and PJ6 o n
the finisher control board.
Measure continuity on the
cable for all positi ons. Is
there continuity?

Clear the paper
path.

Go to step 3. Properly connect

Go to step 4. Go to step 5.

Go to step 6. Replace the

Go to step 2.

the cables.

cable.

5 Replace the feed motor

assembly. Did this resolve
the problem?

2-28 Service Manual

Problem solved. Replace the

finisher control
board.

5055-xxx

Step Questions/actions Yes No

6 Measure for +24 V dc

between pins 1 and 2 on
connector PJ3 on the
finisher control board.
Measure for +5 V dc
between pins 1 and 3 on
PJ2 on the finisher control
board. Is either voltage
missing?

Replace th e
power supply.

Replace the
finisher control
board.

Diagnostic information 2-29

5055-xxx

996 - Finisher Jogging Motor Error

Step Questions/actions Yes No

1 Are there foreign objects or

obstructions in the jogging
assembly?

2 Are the jogging motor

connectors CN2 on the
finisher control board
securely connected?

3 Make sure the finisher set

switch is activated.
Measure for +24 V dc
(±10%) between pin 1 on
CN2 and frame ground. Is
+24 V dc present?

4 Replace the jogging motor

assembly. Did this resolve
the problem?

5 Disconnect CN2 and PJ5.

Perform a continuity check
on the cable for all
positions. Is there
continuity?

6 Check for +24 V dc (±10%)

between pins 1 and 2 of
PJ3 on the finisher control
board. Is +24 V dc present?

Clear the obje cts
or obstruction.

Go to step 3. Securely

Go to step 4. Go to step 5.

Problem solved. Replace the

Go to step 6. Replace the

Replace th e
finisher control
board.

Go to step 2.

connect the
connectors.

finisher control
board.

cable.

Replace the
power supply.

2-30 Service Manual

5055-xxx

997 - Finisher Tractor Motor Error

Step Questions/actions Yes No

1 Are there obstructions or

foreign objec ts in the
accumulator or face down
paper path?

2 Are the connectors CN3 at

the tractor motor and PJ4
on the finisher control boar d
securely connected?

3 Make sure the finisher set

switch is activated.
Measure +24 V dc b etwee n
pin 1 of tractor motor
connector CN3 and frame
ground. Is +24 V dc
(±10%)?

4 Replace the tractor motor

assembly. Did this resolve
the problem?

5 Disconnect CN3 and PJ4

on the finisher control boar d
and perform a continuity
check on all positions. Is
there continuity on all
positions?

Remove the
objects or
obstructions.

Go to step 3. Securely

Go to step 4. Go to step 5.

Problem solved. Replace the

Go to step 6. Replace the

Go to step 2.

connect the
connectors.

finisher control
board.

cable.

6 Check for +24 V dc

between pins 1 and 2 of
PJ3 on the finisher control
board. Is +24 V dc present?

Replace th e
finisher control
board.

Replace the
power supply.

Diagnostic information 2-31

5055-xxx

998 - Tray Elevator Motor Error

Step Questions/actions Yes No

1 Are the connectors CN4 at

the tray elevator motor and
connector PJ4 on the
finisher control board
properly connected?

2 Make sure that the finisher

set switch is activated.
Power the printer off.
Measure for appr oximately
+24 V dc (±10%) between
pins 1 and 2 of connector
CN4 at the tray elevator
motor . Power the printer on
and observe the voltage
meter during the first 12
seconds of power up. Is
+24 V dc present while the
printer is powering up?

3 Disconnect CN4 at the tray

elevator motor. Disconnect
PJ4 on the finisher control
board. Measure for
continuity between CN4 pin
1 and PJ4 pin 7. Measure
for continuity between CN4
pin 2 and PJ4 pin 8. I s there
continuity i n both locations?

Go to step 2. Properly connect

the connectors.

Replace th e tray
elevator motor.

Go to step 4. Replace the

Go to step 3.

cable.

4 Measure for +24 V dc

(±10%) between pins 1 an d
2 on connector PJ6. Is +24
V dc present?

2-32 Service Manual

Replace th e
finisher control
board.

Replace the
finisher power
supply.

5055-xxx

999 - Stapler Motor Error

Step Questions/actions Yes No

1 Are staples jammed in the

stapler?

2 Clear the staple jam and

run the staple test in
diagnostic mode or run a
staple job. Does the
problem reoccur?

3 Are the connectors CN5 on

the stapler and PJ1 on the
finisher control board
securely connected?

4 Did replacement of the

stapler cartridge resolv e the
problem?

5 Make sure the finisher set

switch is activated.
Measure for 5 V dc
between pins 11 and 12 on
stapler connector CN5. Is
5 V dc present?

6 Did replacement of the

finisher control board
correct the problem?

Go to step 2. Go to step 3.

Replace th e
staple cartridge
and to go step 4.

Go to step 5. Securely

Problem
resolved.

Replace th e
stapler.

Problem solved. Go to step 7.

Problem solved.

connect the
connectors.

Replace the
stapler.

Replace the
finisher control
board.

7 Is there continuity on the

stapler to finisher control
board cable?

Replace th e
power supply.

Replace the
cable.

Diagnostic information 2-33

5055-xxx

Attendance messages

Message Meaning Action

Activating
Menu Changes

Bin <x> Full The specified bin is full. Remove the paper from the

Busy The printer is busy receiving,

Canceling Fax The printer is processing a

Canceling Job The printer i s processing a

Change <x> The printer is requesting a

Check
<device>
connection

The printer is activating
changes made to the printer
settings.

processing, or printing data.

request to cancel a fax job.

request to cancel the current
print job.

different type of paper.

• The specified de vice is not
fully connected.

• Hardware failure.

Wait for the message to
clear.

bin.
Wait f or the messag e to clear

or press Menu to open the
Job Menu and cancel the
current job.

Wait for the message to
clear.

Wait for the message to
clear.

Change paper.

• Reestablish
communication by
reattaching the device.

• Press Go to clear the
message.

• If a hardware failure, turn
the printer off and back
on. If the error recurs, turn
the printer off, remove the
specified device and call
for service. If the error
cannot be reset,
go to “Map 10 -

Unrecoverable Check
Tray (x) or Duplex
Connection message”
on page 2-60.

Clearing Job
Accounting
Stat

The printer is deleting all job
statistics stored on the hard
disk.

2-34 Service Manual

Wait for the message to
clear.

5055-xxx

Message Meaning Action

Close Side
Door

Close Front
Door

Close Tray <x>
Top Cover

Copying The printer is processing a

Defragmenting The printer is defragmenting

Delete All Jobs The printer is requesting

The printer side door is
open.

The printer front door is
open.

The high-capacity feeder
door is open.

copy job originating from the
scanner.

the flash memory to reclaim
storage space occupied by
deleted resources .

confirmation to delete all
held jobs.

Close the printer side door . If
the error cannot be reset, go
to “Map 1 - F alse Sid e Door

Open message” on
page 2-54.

Close the printer top door
and front door. If the error
cannot be reset go to “Map

2 - False Close Front Door
message” on page 2-54.

Close the HCF door and the
top cover. If the error cannot
be reset, go to “Map 3 -

False Close Tray (x) Top
Cover message” on
page 2-55.

Wait for the message to
clear.

Wait for the message to
clear.

Warning: Do not turn the
printer off while this
message is displayed.

• Press Go to cont inue. The
printer deletes all held
jobs.

• Press Stop to cancel the
operation.

Deleting Jobs Th e printer is dele ting one or

more held jobs.

Disabling
Menus

The printer is responding to
a request to disable the
menus.

Wait for the message to
clear.

Wait for the message to
clear.

Note: While the menus are
disabled, y ou c annot cha nge
the printer settings from the
operator panel.

Diagnostic information 2-35

5055-xxx

Message Meaning Action

Disk Corrupted
Reformat?

Disk Recovery
x/5 yyy%

Enabling
Menus

Engine
Warming

Enter PIN:
=______

Fax <x> The printer is processing an

Flushing Buffer The printer is flushing

The printer has attempted a
disk recovery process and
cannot repair the disk.

The printer is attempting to
recover the hard disk .

The prin ter is responding to
a request to mak e the menus
available to all users.

The printer is warming the
fuser assembly.

The printer is waiting for you
to enter your four-digit PIN
number.

incoming f ax .

corrupted print data and
discarding the current print
job.

• Press Go to reformat the
disk and delete all files
currently stored on the
disk.

• Press Stop to clear the
message without
reformatting the disk.

Wait for the message to
clear.

Warning: Do not turn the
printer off while this
message is displayed.

Wait f or the messag e to clear
and press Menu to view the
menus available.

Wait for the message to
clear.

Use the operator panel
buttons to enter the PIN.

Wait for the message to
clear.

Wait for the message to
clear.

Formatting
Disk yyy%

Formatting
Flash

Fuser
Maintenance

The printer is formatting the
hard disk. The second line
shows percentage complete.

The printer is formatting
flash memory.

The counter that trac ks w ea r
on the fuser has reached its
limit.

2-36 Service Manual

Wait for the message to
clear.

Wait for the message to
clear.

• Press Go to continue
printing.

• If print quality is
unacceptable, replace the
fuser.

5055-xxx

Message Meaning Action

Held Jobs May
be Lost

Infrared <x> An infrared interface is the

Insert Tray <x> The specified tray is either

Install
<device> or
Cancel Job

Invalid Engine
Code

Invalid Netw ork
<x> Code

The printer memory is too
full.

active communication link.

missing or not fully inserted.

The printer is requesting a
specified de vi ce be ins tal led
so it can print.

The printer engine code has
not been programmed or is
not valid.

The code in an internal print
server is not valid. The
printer cannot receive and
process jobs until valid code
is programmed into the
internal print server.

• Press Go to clear the
message. The p rinter
frees memory by deleting
the oldest job and
continues deleting jobs
until there is enough
memory.

• Press Stop to clear the
message without deleting
jobs.

• Press Menu to open the
Job Menu and cancel the
current job.

Wait for the message to
clear.

Insert the specified tray. If
the error cannot be reset, go
to “Paper tray missing

service check” on
page 2-83.

• Turn the printer off, install
the specified device and
restart the printer.

• Press Menu to open the
Job Menu and cancel the
current job.

Call for service.

Download valid code to the
printer internal print server.

Diagnostic information 2-37

5055-xxx

Message Meaning Action

Load <x> The printer is trying to feed

paper from a source it
detects is empty.

Load Manual A request for a manual feed

job has been sent to the
printer. The printer is ready
for insertion of a single sheet
into the manual fe ed sl ot.

Load paper of the size and
type requested in the second
line of the display in the
specified tra y . Press Menu to
open the Job Menu and
cancel the current job.

• If Load (Tray) cannot be
reset, go to “Map 4 -

False Tray (x) Low/
Empty message” on
page 2-56.

• If Load (MPF), check the
MPF paper present
sensor.

• Load a sheet of paper
specified in the second
line of the display in the
manual feed tray or
multipurpose feeder.

• Press Select or Go to
ignore the manual feed
request and print on pap er
already in the printer.

• Press Menu to open the
Job Menu and cancel the
current job.

LocalTalk <x> A LocalTalk interface is the

active commu ni cation link.

Menus
Disabled

Network Card
Busy

Network <x> A network interface is the

The printer menus are
disabled.

An internal print server is
being reset.

active commu ni cation link.

2-38 Service Manual

Wait for the message to
clear.

You can still open the Job
Menu to cancel a job that is
printing or to select a
confidential job or a held job
that you want to print.

Wait for the message to
clear.

Wait for the message to
clear.

5055-xxx

Message Meaning Action

Network
<x>, <y>

No Jobs
Found, Retry?

Not Ready The printer is not ready to

Parallel <x> A parallel interface is the

Performing Self
Test

Power Saver The printer is ready to

Print Jobs on
Disk

Printer
Calibrating

Network interface is the
active communication link,
where <x> represents the
active link and <y>
represents the channel.

The PIN number entered is
not associated with any
confidential job.

receive or process data.

active communication link.
The printer is running the

series of start-up tests it
performs after it is turned on.

receive data. It is reducing
electricity consumpti on while
idle.

Jobs spooled to the hard
disk before the printer was
last turned off have not y et
printed.

The printer is adjusting the
color tables to correct
variations caused by
environmental conditions.

Wait for the message to
clear.

• Press Go to enter another
PIN.

• Press Stop to clear the
PIN entry prompt.

Press Go to m ake the prin ter
ready.

Wait for the message to
clear.

Wait for the message to
clear.

• Send a job to the printer.

• Press Go to quickly warm

the printer to normal
operating temperature
and display the Ready
message.

Press Go to print the jobs.
Press Return or Stop to

delete jobs.
Wait for the message to

clear.

Printing
Alignment
Page

Printing
Directory List

The printer is processing or
printing a test page that
shows alignment values.

The printer is processing or
printing a directory of all files
stored in flash memo ry or on
a hard disk.

Wait for the message to
clear.

Wait for the message to
clear.

Diagnostic information 2-39

5055-xxx

Message Meaning Action

Printing Font
List

Printing Job
Accounting
Stat

Printing Menu
Settings

Prog Engine
Code

Prog System
Code

Program Flash The printer is storing

Programming
Disk

Programming
Error <x>

The printer is processing or
printing a list of all available
fonts f o r the sp eci f ie d printe r
language.

The printer is processing or
printing all job accounting
statistics stored on the hard
disk.

The printer is processing or
printing the menu settings
page.

The prin ter is programming
new code into flash memory.

The prin ter is programming
new system code.

resources, such as fonts or
macros, in flash memory.

The printer is storing
resources, such as fonts or
macros, on hard disk.

An error occurred while the
printer was programming
code into memory.

Wait for the message to
clear.

Wait for the message to
clear.

Wait for the message to
clear.

Wait for the message to
clear.

Wait for the message to
clear.

Wait for the message to
clear.

Wait for the message to
clear.

Correct the problem
specified on the second line
of the display.

Queuing and
Deleting Jobs

Queuing Jobs The printer is sending o ne or

Ready The printer is ready to

The printer is deleting o ne or
more held jobs and sending
one or more jobs to print.

more held jobs to print.

receive and process print
jobs.

2-40 Service Manual

Wait for the message to
clear.

Wait for the message to
clear.

Send a job t o print.

5055-xxx

Message Meaning Action

Ready Hex The printer is in Hex Trace

mode and is ready to recei ve
and process print jobs.

Remove Paper
<specified bin>

Resetting
Maint Cnt
Value

Resetting the
Printer

Restore Held
Jobs. Go/
Stop?

Restoring
Factory
Defaults

The specified output bin is
full.

The printer is resetting the
counter that tracks wear on
the fuser.

The printer is resetting to the
current default settings. Any
active print jobs are
canceled.

The printer has been rese t or
has been turned on and the
printer detects print and hold
jobs stored on the hard disk.

The printer is restoring
factory default settings.

• Send a job to print. All
data is printed in
hexadecimal. Control
strings are printed, not
executed.

• Turn the printer off and
then on to exit Hex Trace
mode.

Remove the paper from the
specified bin(s).

Wait for the message to
clear.

Wait for the message to
clear.

Press Go. All jobs on hard
disk are restored.

Press Return or Stop. No
jobs are restored and the
printer returns to Ready.

Wait for the message to
clear.

Restoring Held
Jobs

Serial <x> A serial interface is the

Std Bin Full The standard bin is full. Remove the paper in the bin

Supplies One of the printer supplies

The printer is restoring held
jobs from the hard disk.

active communication link.

requires attention.

Wait for the message to
clear.

Wait for the message to
clear.

to clear the message.
Press Menu to open the

Supplies Menu and identify
which supply item needs
replacing.

Diagnostic information 2-41

5055-xxx

Message Meaning Action

Tray <x>
Empty

Tray <x> Low The specified tray is low of

Tray <x>
Missing

Unsupported
Disk

USB <x> The printer is processing

Waiting The printer is waiting for an

The specified tray is out of
paper.

paper.

The specifi ed tray is either
missing or not fully inserted.

The printer detects an
unsupported disk.

data through the specified
USB port.

End of Job command, a
Form Feed Command, or
additional data.

Load paper in the tray and
try to clear the message. If
the message cannot be
reset, go to “Map 4 - False

Tray (x) Low/Empty
message” on page 2-56.

Add paper in the tray and try
to clear the message. If the
message cannot be reset, go
to “Map 4 - False Tray (x)

Low/Empty message” on
page 2-56.

Insert the tray completely. If
the message cannot be
reset, go to “Paper tray

missing service check” on
page 2-83.

• Press Go to clear the
message.

• Format the disk.

Wait for the message to
clear.

• Press Go to print the
contents of the buffer.

• Press Menu to open the
Job Menu and cancel the
current job.

1565 Emul
Error Load
Emul Option

2 <xx> Paper
Jam

The download emulator
version on th e f irmware ca rd
does not match the printer
code version.

The printer detects a paper
jam.

2-42 Service Manual

Download the correct
emulator version from
Lexmark’s Web site.

Clear the paper path. If the
message cannot be reset, go
to the “Paper carrying

service check” on
page 2-74.

5055-xxx

Message Meaning Action

30 Coating Roll
Missing

30 <color>
Print Unit
Missing

32
Unsupported
<color>
Cartridge

33 Tray <x>
Config Error

34 Short Paper The paper is too short. • Press Go to clear the

The oil coating roll is either
missing or installed
incorrectly.

One or more of the color
print units is either missing
or incorrectly installed.

The printer detects an
unsupported toner cartridge.

The optional heavy media
tray is inserted into any tray
location except tray 1.

Correctly install the oil
coating roll. If the message
cannot be reset, go to

“Map 5 - False 30 Oil
Coating Roll Missing
message” on page 2-57.

Correctly install the color
print unit(s). If the message
cannot be reset, go to “Map

6 - False <color> Print Unit
Missing message” on
page 2-57.

Replace the cartridge.

Remove the heavy media
tray from the invalid location.

message.

• Make sure the paper size
setting in the Pape r Menu
is correct for the size you
are using.

• Press Menu to open the
Job Menu and cancel the
current job.

35 Res Save
Off Deficient
Memory

37 Insufficient
Collation Area

The printer lacks the
memory to enable Res ourc e
Save.

The printer memory does not
have the free space
necessary to collate the job.

• Press Go to disable
Resource Save and
continue printing.

• Install additional memory.

• Press Go to print the

portion of the job already
stored and begin collating
the rest of the job.

• Press Menu to open the
Job Menu and cancel the
current job.

Diagnostic information 2-43

5055-xxx

Message Meaning Action

37 Insufficient
Defrag
Memory

37 Insufficient
Memory

38 Memory
Full

39 Complex
Page

4 <x>
Unsupported
Firmware Card

The printer cannot
defragment flash memory.

The printer memory is full
and cannot continue
processing current jobs.

The printer is processing
data, but the memory is full.

The print information on the
page is too complex.

The printer detects an
unsupported version of
firmware on the installed
firmware card.

• Delete fonts, macros, and
other data in printer
memory.

• Install additional printer
memory.

• Press Go to clear the
message and continue
printing.

• Press Stop to clear the
message without deleting
print jobs.

• Press Menu to open the
Job Menu and cancel the
current job.

• Press Go to clear the
message and continue
printing.

• Press Menu to open the
Job Menu and cancel the
current job.

• Press Go to clear the
message and continue
printing.

• Press Menu to open the
Job Menu and cancel the
current job.

• Turn the printer off and
then press and hold Go
while turning it on,
bypassing the co de on the
firmware card.

• Remove the firmware
card.

2-44 Service Manual

5055-xxx

Message Meaning Action

40 Tray <x>
Size Sense
Error

41 Open Bin 1
Exit Tray

51 Defectiv e
Flash

52 Flash Full There is not enough free

The high-capacity feeder
detects an error in the size
sensing mechanism.

The printer wants to send
paper to the bin 1 output tr ay,
but the tray is closed .

The printer detects defective
flash memory.

space in flash memory.

• Turn off the printer and be
sure that all the high­capacity fee der
connectors are installed
properly.

• Check the high-capacity
feeder siz e sensor and go
to

“Map 8 - False 40 Tray
(x) Size Sensor Error
message” on page 2-59.

• Open bin 1 to clear the
message.

• Press Go to clear the
message and continue. If
the message cannot be
reset, go to

“Map 9 - False 41 Open
Bin 1 Exit Tray
message” on page 2-59.

• Press Go to clear the
message and continue
printing.

• Install different flash
memory before
downloading.

• Press Go to clear the
message and continue
printing.

• Delete fonts, macros, and
other data stored on flash
memory.

• Install flash memory with
more storage capacit y.

53
Unformatted
Flash

The printer detects
unformatted flash memory.

• Press Go to clear the
message and continue
printing.

• Format the flash memory.
If the error remains, the
flash memory may be
defective.

Diagnostic information 2-45

5055-xxx

Message Meaning Action

54 Serial
Option <x>
Error

54 Network
<x> Software
Error

54 Standard or
Std <x>
Software Error

54 Std Par
ENA
Connection
Lost

54 Par <x>
ENA
Connection
Lost

The printer has detected a
serial interface error on a
serial port.

The printer cannot establish
communications with an
installed netwo rk port.

The printer has lost the
connection to an external
print server.

• Make sure the se rial link is
set up correctly and you
are using the appropriate
cable.

• Press Go to clear the
message and continue.

• Press Menu to open the
Job Menu and reset the
printer.

• Press Go to clear the
message and continue
printing.

• Program new firmware for
the network interface by
way of the parallel port.

• Press Menu to open the
Job Menu and reset the
printer.

• Make sure the cable
connecting the ENA and
the printer is securely
attached. Turn the printer
off and then on to reset.

• Press Go to clear the
message and continue
printing.

56 Serial Port
<x> Disabled

56 Para llel P ort
<x> Disabled

56 Std Parallel
Port Disabled

Data has been sent to the
printer through a disabled
serial port.

Data has been sent to the
printer through a disabled
parallel port.

2-46 Service Manual

• Press Go to clear the
message.

• Make sure the Serial
Buffer menu item in the
Serial Menu is set to
Disabled.

• Press Go to clear the
message.

• Make sure the Parallel
Buffer menu item in the
Parallel Menu is set to
Disabled.

5055-xxx

Message Meaning Action

56 USB Port
<x> Disabled

56 Std USB
Port Disabled

58 T oo Many
Bins Attached

58 T oo Many
Disks Installed

58 T oo Many
Flash Options

58 T oo Many
Trays Attached

61 Defectiv e
Disk

62 Disk Full Insufficient memory on the

Data has been sent to the
printer through a disabled
USB port.

Too many output bins are
installed.

Unsupported output bins are
installed.

Too many disks are installed. Turn off and unplug the

Too many flash options are
installed.

Too many trays are installed. Turn off and unplug the

The printer detects a
defective hard disk.

hard disk.

• Press Go to clear the
message.

• Make sure the USB Buffer
menu item in t he USB
Menu is set to Disabled.

Turn off and unplug the
printer. Remove or
reconfigure the output bins.
Plug the printer in and turn it
on.

printer. Remove the excess
hard disks. Plug the printer
in and turn it on.

Turn off and unplug the
printer. Remove the excess
flash options. Plug the
printer in and turn it on.

printer. Remove the excess
trays. Plug the printer in and
turn it on.

• Press Go to clear the
message and continue
printing.

• Install a different hard di sk
before you perform any
operations that require
one.

• Press Go to clear the
message and continue
printing.

• Delete fonts, macros, and
other data stored on the
hard disk.

Diagnostic information 2-47

5055-xxx

Message Meaning Action

63
Unformatted
Disk

64
Unsupported
Disk Format

80 Belt
Exhausted

80 Belt/Fuser
Exhausted

80 Belt/Fuser
Life W arnin g

80 Belt Life
Warning

80 Fuser
Exhausted

The printer detects an
unformatted hard disk.

The printer detects an
unsupported disk format.

The transfer belt has
reached end of life.

The transfer belt and fuser
have reached end of life.

The transfer belt and fuser
are nearing end of life.

The transfer belt is nearing
end of life.

The fuser has reached end
of life.

• Press Go to clear the
message and continue
printing.

• Format the disk before
performing disk
operations.

• Replace the hard disk.

• Press Go to clear the

message.

• Format the disk.

Replace the transfer belt.

Replace the transf er belt and
fuser.

Press Go to clear the
message and continue
printing. The supplies
message is displayed until
you replace the transfer belt
and fuser.

Press Go to clear the
message and continue
printing. The supplies
message is displayed until
you replace the transfer belt
and fuser.

Replace the fuser.

80 Fuser Life
Warning

81 Engine
Code CRC
Failure

The fuser is nearing end of
life.

Microcode in the engine
flash code modul e has failed
a system check .

2-48 Service Manual

Press Go to clear the
message and continue
printing. The supplies
message is displayed until
you replace the transfer belt
and fuser.

Press Go to clear the
message and discard the
code. Retransmit the
microcode data from the
host computer.

5055-xxx

Message Meaning Action

84 All Photo
Devs
Exhausted

84 Black Photo
Dev Abnormal

84 Black Photo
Dev Exhausted

84 Black Photo
Dev Life
Warning

All of the photodevelopers
have reached end of life.

The printer has detected an
abnormal black
photodeveloper.

The black photodeveloper
has reached end of life.

The black pho todevelo per is
nearing end of life.

Replace all of the
photodevelopers. Mak e sure
you also install the new fuser
coating roll that is include d in
each photodeveloper kit.

Install a new black
photodeveloper to clear the
message and continue
printing.

Replace the black
photodeveloper. Make sure
you also install the new oil
coating roll that is include d in
the kit.

If print quality is still
acceptable and you do not
want to replace the
photodeveloper , pres s Go to
clear the message and
continue printing.

Press Go to clear the
message and continue
printing. The supplies
message is displayed until
you replace the
photodeveloper.

84 Color Photo
Dev Abnormal

The printer has detected an
abnormal color
photodeveloper.

Install a new color
photodeveloper to clear the
message and continue
printing.

Diagnostic information 2-49

5055-xxx

Message Meaning Action

84 Color Photo
Devs
Exhausted

84 <Color>
Photo Dev Life
Warning

85 Toner
Empty
Coating Roll
Exhausted

88 Black Toner
Empty

The color photodevelopers
have reached end of life.

The color photodevelopers
are nearing end of life.

The oil coating roll has
reached end of life.

The black toner cartridge is
empty. See note below.

Replace the color
photodevelopers (Cyan,
Magenta and Yellow) at the
same time.

If print quality is still
acceptable and you do not
want to replace the
photodevelopers, press Go
to clear the message and
continue printing.

Press Go to clear the
message and continue
printing. The supplies
message is displayed until
you replace the
photodevelopers.

Replace the oil coating roll
and black toner cartridge.

Note: If the customer has replaced the black toner cartridge before
this message displays, the oil coating roller message will not display
until the cartridge is empty.

86 Abnormal
Coating Roll

85 Coating Roll
Life W arnin g

84 <color>
Photo Dev
Abnormal

Abnormal coating roll
Installed.

Coating roll is nearing it’s
expected lif t.

Abnormal photodeveloper
installed

2-50 Service Manual

Replace the coating roll with
a valid one to clear this
message.

If the print quality is still
good, press Go to continue.
Otherwise, replace the oil
coating roll.

Install correct
photodeveloper.