Lexmark C91 Service Manual

5055-xxx

Lexmark C91x

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

• Table of Contents

•Index

• Safety and Notic es

• Trademarks

• Start Diagnostics

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

inconsi s te nt with loca l law: LEXMARK INTERNATIONAL, INC. PROVIDES THIS

PUBLICATION “AS IS” WIT HO U T WARRANT Y OF ANY KIND, EITHER EXPRESS OR
IMPLIED, INCLUDING, BU T NOT LIMITED TO, THE IMPLIED WA RRAN TIES 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.

5055-xxx

P/N 12G9292

iii

5055-xxx

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 performanc e . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

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

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

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

Duty cycl e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

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

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

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

Input and output configurati ons. . . . . . . . . . . . . . . . . . . . . . . . 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

iv Service Manual

5055-xxx

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

v

5055-xxx

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

Print quality probl ems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 feed ing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

vi Service Manual

5055-xxx

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

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

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

High-capacity feed er (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

vii

5055-xxx

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 pre sent sensor remova l . . . . . . . . . . . . . . . . . . . . . . . 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 sens or 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

viii Service Manual

5055-xxx

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

Duplex unit separatio n 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 carr ying 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 disch arge br us h remova l . . . . . . . . . . . . .4-93

Inverter paper exit roller remov al . . . . . . . . . . . . . . . . . . . . . .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 asse mbl y remov al. . . . . . . . . . . . . . . . .4-108

ix

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

x Service Manual

5055-xxx

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

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

Assembly 12: Fuser 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: Finish er docking 1 . . . . . . . . . . . . . . . . . . . . . .7-68

Assembly 31: Finish er 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

Safety information xi

5055-xxx

Safety information

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

the original design and specific components. The manufacturer
is not responsible for safety in the event of use of unauthorized
replacement parts.

• The maintenance information for this product has been

prepared for use by a professional service person and is not
intended to be used by others.

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

injury during disassembly and servicing of this product.
Professional service personnel should understand this and take
necessary precautions.

• 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

• 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.

xii Service Manual

5055-xxx

Norme di sicurezza

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

del progetto originale e dei componenti specifici. Il produttore
non è responsabile per la sicurezza in caso di sostituzione non
autorizzata delle parti.

• Le informazioni riguardanti la manutenzione di questo prodotto

sono indirizzate soltanto al personale di assistenza autorizzato.

• Durante lo smontaggio e la manutenzione di questo prodotto,

il rischio di subire scosse elettriche e danni alla persona è più
elevato. Il personale di assistenza autorizzato deve, quindi,
adottare le precauzioni necessarie.

• 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 Vorsichtsmaßnahmen
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.

Safety information xiii

5055-xxx

Pautas de Seguridad

• La seguridad de este producto se basa en pruebas y

aprobacione s 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

• 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 profi ssio nai s des tes 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

possív el pr e s en ça 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.

xiv Service Manual

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 serv 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.

Safety information xv

5055-xxx

xvi Service Manual

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.

General information 1-1

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

5055-230

C912

5055-210

C912

5055-200

C912

5055-01N

C910

5055-010

C910

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 av ai lab le

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

finisher w/stand

XX

Printer cabinet X X

1-2 Service Manual

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 av ailable 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.

General information 1-3

5055-xxx

Physical specifications and weight

Description Height Width Depth Weight

Printers

Lexmark C91x

1

20.2 in.
(512 mm)

27.4 in.
(695 mm)

25.8 in.
(655 mm)

177 lb
(80.5 kg)

Lexmark C91xn

2,4

25.2 in.
(641 mm)

27.4 in.
(695 mm)

25.8 in.
(655 mm)

217.8 lb
(99.0 kg)

Lexmark C91xdn 25.2 in.

(641 mm)

27.4 in.
(695 mm)

25.8 in.
(655 mm)

230.8 lb
(104.9 kg)

Lexmark C91xfn

3

40.5 in.
(1028 mm)

46.9 in.
(1191 mm)

25.8 in.
(655 mm)

336.4 lb
(152.9 kg)

Fully configured

4

40.5 in.
(1028 mm)

60.0 in.
(1520 mm)

25.8 in.
(655 mm)

443.3 lb
(201.5 kg)

Options

Duplex unit 4.7 in.

(120 mm)

27.4 in.
(695 mm)

13.8 in.
(350 mm)

13.0 lb
(5.9 kg)

550-Sheet drawer 5.1 in.

(129 mm)

27.4 in.
(695 mm)

25.8 in.
(655 mm)

40.8 lb
(18.5 kg)

High-capacity feeder,
3000-sheet

25.0 in.
(635 mm)

14.2 in.
(360 mm)

20.7 in.
(525 mm)

50.0 lb
(22.6 kg)

Staple Punch fini she r,
1100-sheet
(with stand)

41.7 in.
(1060 mm)

19.5 in.
(495 mm)

20.5 in.
(520 mm)

56.9 lb
(25.9 kg)

Furniture

Printer cabinet 20.4 in.

(517 mm)

26.6 in.
(675 mm)

23.6 in.
(598 mm)

57.5 lb
(26.0 kg)

Printer base 10.2 in.

(260 mm)

26.6 in.
(675 mm)

23.6 in.
(547 mm)

33.0 lb
(15.0 kg)

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.

1-4 Service Manual

5055-xxx

Print speed and performance

Standa rd and
heavy media
tray

High-capacity
feeder

Multipurpose
feeder

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

1

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)

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

General information 1-5

5055-xxx

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 pag es

• Lifetime maximum duty cycle–600,000 pages

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 duplex 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.

1-6 Service Manual

5055-xxx

Printer memory

Memory configuration

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.

DRAM memory Standard Maximum

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

General information 1-7

5055-xxx

Resident fonts

For a listing of specific fonts, visit www.le xmark.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.

Emulation Scalable Fonts Bitmapped fonts

PCL 6 84 2
PostScript 3 156 0

1-8 Service Manual

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

2

.

Input and output configurations

Sources and
capacities

Lexmark
C91x

Lexmark
C91xn

Lexmark
C91xdn

Input sources

Number of standard
sources

233

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

input sources

666

Input capacities (sheets)
Standard

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

capacity

650 1,200 1,200

Optional

500-sheet drawer 550 550 550
Heavy media tray

1

Yes Yes Yes

High-capacity feeder

2

3,000 3,000 3,000

Maximum add iti ona l
drawers

322

General information 1-9

5055-xxx

Maximum input
capacity (without
high-capacity feeder)

2,300 2,300 2,300

Maximum input
capacity and
high-capacity feeder

5,300 5,300 5,300

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

1,000 1,000 1,000

Maximum output
capacity

1,650 1,650 1,650

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.

Source s and
capacities

Lexmark
C91x

Lexmark
C91xn

Lexmark
C91xdn

1-10 Service Manual

5055-xxx

Media size supported

Input

500-sheet input

multipurpose feeder

High-capacity feeder

Duplex

Heavy media tray

A4—8.27” x 11.7 in.
(210 mm x 297 mm)

XXXXX

A5—5.83” x 8.27 in.
(148 mm x 210 mm

XXX

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

XX

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

XX XX

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

XXXXX

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

XX XX

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

XX

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

XX XX

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

XX XX

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

XX XX

General information 1-11

5055-xxx

Universal

1,2

Banner 11.69 x 36 in.
(297.2 x 914.4 mm)
Lexm ark 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)

X

X

X

3

X

3

X

7 ¾ Envelope—3.875 in. x

7.5 in. (98 mm x 191 mm)

X

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

X

10 Envelope—4.125 in. x

9.5 in. (105 mm x 241 mm)

X

DL Envelope—4.33 in. x

8.66 in. (110 mm x 220 mm)

X

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

X

C5 Envelope—6.38 in. x

9.01 in. (162 mm x 229 mm)

X

B5 Envelope—6.93 in. x

9.84 in. (176 mm x 250 mm)

X

Other Envelope

4

—

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

X

500-sheet input

multipurpose feeder

High-cap ac ity feed er

Duplex

Heavy media tray

1-12 Service Manual

5055-xxx

Output

Media type

Paper XXXXX
Card stock X
Transparencies X

5

X
Envelopes X
Glossy paper X X

6

XX

Paper labels X

7

X

8

Standard output

Bin 1

Finisher Bin 1

Finisher Bin 2

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

XXXX

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

XXX

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

XX

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

XXX

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

XXXX

500-sheet input

multipurpose feeder

High-cap ac ity feed er

Duplex

Heavy media tray

General information 1-13

5055-xxx

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

XXX

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

XXX

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

XXX

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

XXX

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

XXX

Universal

1,2

Banner 11.69 x 36 in.
(297.2 x 914.4 mm)
Lexm ark 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)

X

X

X

X

X

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

X

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

X

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

X

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

X

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

XX

Standard outpu t

Bin 1

Finisher Bin 1

Finisher Bin 2

1-14 Service Manual

5055-xxx

C5 Envelope—6.38 in. x 9.01 in.
(162 mm x 229 mm)

XX

B5 Envelope—6.93 in. x 9.84 in.
(176 mm x 250 mm)

XX

Other Envelope

4

—11.69 in. x 11.6 9 in .

(297 mm to 297 mm)

XX

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

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 stack of 30 sheets; if more input is required, use Heavy Media Tray.

8

Refer to Cardstock & Label Guide for media guidelines.

Standard outpu t

Bin 1

Finisher Bin 1

Finisher Bin 2

General information 1-15

5055-xxx

Input media types and weights

Media Weight

Standard tray s

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

2

)

Heavy media tray1

Paper–xerographic or business 28 to 47 lb bond (105 to 176 g/m

2

)

Specialty papers–glossy laser4 80 lb book (32 lb bond) (120 g/m

2

)
Transparencies–laser printer type5 47 lb bond (175 g/m2)
Labels–upper limit paper 48 lb bond (180 g/m

2

)

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

2

)

Card stock–upper limit Index
Bristol

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

2

)

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

2

)

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

2

)

Envelopes–sulfite , wood-free, up to
100% cott on

20 to 28 lb bond

2,3

(75 to 105

g/m

2

)

High-capacity feeder

1

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

1

The 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

(28 lb bond).

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.

1-16 Service Manual

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

2

)

Card stock–upper limit Index
Bristol

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

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

2

)

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

Bin 1

3, 4

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

1

80 lb book (32 lb bond) (120 g/m2)

Card stock–upper limit Index
Bristol

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

2

)

Transparencies–laser printer type

2

47 lb bond (175 g/m2)

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

2

)

Envelopes–sulfite, w ood-free, up to
100% cotton

20 to 28 lb bond

6,7,8

(75 to 105 g/m2)

Finisher bin 1

3,4

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

1

80 lb book (32 lb bond) (120 g/m2)

Card stock–upper limit Index
Bristol

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

2

)

Transparencies–laser printer type

2

47 lb bond (175 g/m2)

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

2

)

General information 1-17

5055-xxx

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

2

(21.3 lb bond) or

greater than 105 g/m

2

(28 lb bond).

4

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

5

Finisher supports hole punch, job offset and stapling.

6

Finisher only supports long-edge fed envel opes 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.

Media Weight

1-18 Service Manual

5055-xxx

Input capacity by media and source

Media Stack height Capacity

500-Sheet trays

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

2.2 in. (56 mm) 550 sheets
20 lb (75 g/m

2

)

240 sheets
24 lb (90 g/m

2

)

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

1 in. (25 mm)

Glossy paper 0.6 in. (15 mm) 130 sheets

32 lb (120 g/m

2

)

Multipurpose feeder

Plain paper

0.4 in. (11 mm)

100 sheets
20 lb (75 g/m

2

)
Transparencies 50 transparencies
Envelopes 10 envelopes
Card stock 55 sheets

90 lb index (163 g/m

2

)

Paper labels 55 sheets

up to 48 lb (180 g/m

2

)

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

)

Heavy med ia tray

Plain paper 1.6 in. (40 mm) 300 sheets

32 lb (120 g/m

2

)

Transparencies 0.8 in. (20 mm) 150 transparencies

47 lb (175 g/m

2

)

Paper labels 1.6 in. (40 mm) 200 sheets

up to 48 lb (180 g/m

2

)

Glossy paper 1.6 in. (40 mm) 360 sheets

32 lb (120 g/m

2

)

General information 1-19

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

2

)

Glossy paper Varies 130 sheets

32 lb (120 g/m

2

)

Bin 1 and Staple Punch Finisher Bin 1

Plain paper Varies 100 sheets

20 lb (75 g/m

2

)

Transparencies Varies 50 transparencies

47 lb (175 g/m

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

1-20 Service Manual

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

2

) may cause

unacceptable results.

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.

General information 1-21

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

2

) sulfite or 25% cotton

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

• 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).

1-22 Service Manual

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 Tray 5, depending on the configuration) with
a total capacity of 3,000 sheets (plain paper—letter or A4—20
lb (75 g/m

2

). The high-capacity feeder is customer installable

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

General information 1-23

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

1-24 Service Manual

5055-xxx

Network connections

Internal network connections

• Lexmark MarkNet N2000 Series 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 pr in t servers and the standard
Ethernet connection support the following protocols:

• TCP/IP

• Novell (IPX/SPX including NetWare Directory Services)

• AppleTalk

• LexLink (DLC/LLC)

General information 1-25

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 printer.

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.

1-26 Service Manual

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.

Electrical specifications

Low voltage models

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

• 99 to 135 V, extreme

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.

Printing states (average
power)

Non­network

Network

Duplex/
network

Off 0 W * *
Average power while printing

Continuous mono
Continuous color

400 W
290 W

400 W
290 W

410 W
300 W

Average power while printing

Continuous mono
Continuous color

13 W

125 W

14 W

125 W

15 W

125 W

Average power while printing

Continuous mono
Continuous color

11 A

6 A

11 A

6 A

11 A

6 A

* 0 W. Always active and drawing voltage.

General information 1-27

5055-xxx

Operating clearances

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)

Dimension Measurement Notes

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

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

Right
side

C91x(n) 6 in. (152 mm) Clearance on right si de should

be 30 in. (762 mm) with the
high-capacity feeder attached.

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

C91xdn 13 in. (330 mm)

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

or finisher attached, the top
clearance nee ds to be 4 3.8 in.
(1,113 mm).

1-28 Service Manual

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.

General information 1-29

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.

1-30 Service Manual

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 l int 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.

General information 1-31

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 tim es or higher)

• 6-angle wrench (1.5 mm)

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

1-32 Service Manual

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

General information 1-33

5055-xxx

Abbreviations

ASIC Application-specific integrated circuit
CSU Customer setup
DRAM Dynamic random access memory
EP Electrophotographic proces s
EPROM Erasable programmable read-only memory
ESD Electrostatic discharge
FR U 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

1-34 Service Manual

5055-xxx

Diagnostic information 2-1

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 messag e

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.

2-2 Service Manual

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 printhead

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)

Diagnostic information 2-3

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.

2-4 Service Manual

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 - Drive Motor Error

910 Service
Motor Error

Step Questions/actions Yes No

1 Are connectors CN1 and

CN5 on the motor drive
board connected properly?

Go to step 2. Connect CN1

and CN5.

2 Is connector CN33 on the

printer controller board
connected properly?

Replace the
motor drive
board and go to
step 3.

Connect CN33.

3 Did replacement of t he

motor drive bo ard s olve the
problem?

Problem solved. Replace the

printer controller
board and go to
step 4.

4 Did replacement of t he

printer controller board
solve the problem?

Problem solved. Replace all the

supplies and go
to step 5.

5 Did replacement of t he

supplies solve the problem?

Problem solved. Replace the

drive motor.

Diagnostic information 2-5

5055-xxx

911 - Paper Exit Motor Error

912 - High-Capacity Feed Motor Error

917 - RIP Fan Error

Step Questions/actions Yes No

1 Is connector CN4 on the

printer controller board
securely connected?

Replace the
paper exit motor
and go to step 2.

Plug the
connector in
securely.

2 Did replacement of the

paper exit motor solve the
problem?

Problem solved. Replace the

printer controller
board.

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 Service
Fan Error

Step Questions/actions Yes No

1 Is connector J5 on the RIP

board connected properly?

Go to step 2. Properly connect

J5.

2 Is 24 V dc pres en t bet w e en

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

Replace the RIP
fan.

Go to step 3.

3 Is 24 V dc pres en t bet w e en

pin 80 of the RIP/printer
controller and ground?

Replace the RIP
board.

Replace the
printer controller
board.

2-6 Service Manual

5055-xxx

918 - Main Unit Fan Error

919 - Power Supply Fan Error

920 - Fuser Error—Fuser Heater Trouble

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 the
failing fan.

Replace the
printer controller
board.

Step Questions/actions Yes No

1 Is +24 V present between

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

Replace the
power supply
fan.

Replace the
printer controller
board.

92x Service
Fuser Error

Step Questions/actions Yes No

1 Replace the fuser. Did this

fix the problem ?

Problem solved. Return the fuser ,

replace the
power supply 2
and go to step 2.

2 Did replacing power supply

2 fix the problem?

Problem solved. Return power

supply 2 and
replace the
printer controller
board.

Diagnostic information 2-7

5055-xxx

923 - Upper Fuser Thermi stor Open Error

924 - Lower Fuser Thermistor Open Error

Step Questions/actions Yes No

1 Is connector CN44 on the

printer controller board
connected properly?

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

Plug the
connector in
securely.

2 Is error 923 displayed? Power off and

reconnect CN4 4.
Go to step 3.

Replace the
printer controller
board.

3 Power the printer off and

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

Replace the
fuser.

Replace the
printer controller
board.

Step Questions/actions Yes No

1 Turn off the printer and

reinstall the fuser, making
sure it clicks into place.
Tur n 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?

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

Plug the
connector in
securely.

3 Is error 924 displayed? Turn the printer

off and
reconnect CN44.
Go to step 4.

Replace the
printer controller
board.

4 Turn off the printer and

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

Replace the
fuser.

Replace the
printer controller
board.

2-8 Service Manual

5055-xxx

925 - HVU Error

Step Questions/actions Yes No

1 Has the high voltage power

board (HVU) been
removed/replaced?

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

Go to step 2

2 Is connector CN42 on the

printer controller board
connected properly?

Replace the
printer controller
board.
Go to step 3.

Plug the
connector in
securely.

3 Did replacing the printer

controller board fix the
problem?

Problem solved. Replace the high

voltage power
board (HVU).

Diagnostic information 2-9

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?

Go to step 2. Recommend the

customer
replace the
cartridge with
the correct type.

2 Is the toner cartridge

encoder wheel dirty?

Clean the
encoder wheel
and toner
sensor.

Go to step 3.

3 Replace th e toner cartridge

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

Problem solved. Go to step 4.

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?

Replace the
printer controller
board.

Replace the
affected toner
sensor.

2-10 Service Manual

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 t he 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?

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.

Properly connect
the cables.

2 For serial number

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

Replace the
printhead contr ol
board, ca bles
(CL13, CL24),
and LED
printhead.

Replace the
printhead
controller board
and go to step 3.

3 Did replacement of t he

printhead controller board
correct the problem ?

Problem solved. Replace the

printer controller
board.

4 For serial number

XX–1XXXX and above:

Replace the LED printhead
for the affected color.

Did this resolve the
problem?

Problem solved. Replace the

printhead
controller board
and go to step 5.

5 Did replacement of t he

printhead controller board
resolve the problem?

Problem solved. Replace the

printer controller
board.

Diagnostic information 2-11

5055-xxx

931 - Magenta Printhead Error

Step Questions/actions Yes No

1 Chec k to ensure that the

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

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.

Properly connect
the cables.

2 For serial number

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

Replace the
printhead contro l
board, cables
(CL13, CL24),
and LED
printhead.

Replace the
printhead
controller board
and go to step 3.

3 Did replacement of the

printhead controller board
correct the problem?

Problem solved. Replace the

printer controller
board.

4 For serial number

XX–1XXXX and above:

Replace the LED printhead
for the affected co lor.

Did this resolve the
problem?

Problem solved. Replace the

printhead
controller board
and go to step 5.

5 Did replacement of the

printhead controller board
resolve the problem?

Problem solved. Replace the

printer controller
board.

2-12 Service Manual

5055-xxx

932 - Cyan Printhead Error

Step Questions/actions Yes No

1 Check to ensure that the

cables between the LED
printhead and t he 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?

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.

Properly connect
the cables.

2 For serial number

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

Replace the
printhead contr ol
board, ca bles
(CL13, CL24),
and LED
printhead.

Replace the
printhead
controller board
and go to step 3.

3 Did replacement of t he

printhead controller board
correct the problem ?

Problem solved. Replace the

printer controller
board.

4 For serial number

XX–1XXXX and above:

Replace the LED printhead
for the affected color.

Did this resolve the
problem?

Problem solved. Replace the

printhead
controller board
and go to step 5.

5 Did replacement of t he

printhead controller board
resolve the problem?

Problem solved. Replace the

printer controller
board.

Diagnostic information 2-13

5055-xxx

933 - Black Printhead Error

Step Questions/actions Yes No

1 Chec k to ensure that the

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

Are they properly
connected?

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.

Properly connect
the cables.

2 For serial number

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

Replace the
printhead contro l
board, cables
(K13, K24), and
LED printhead.

Replace the
printhead
controller board.

3 Did replacement of the

printhead controller board
correct the problem?

Problem solved. Replace the

printer controller
board.

4 For serial number

XX–1XXXX and above:

Replace the LED printhead
for the affected co lor.

Did this resolve the
problem?

Problem solved. Replace the

printhead
controller board
and go to step 5.

5 Did replacement of the

printhead controller board
resolve the problem?

Problem solved. Replace the

printer controller
board.

2-14 Service Manual

5055-xxx

934 - Color Drum Sensor Error

935 - Black Drum Sensor Error

934 Service
Drum Sensor

Step Questions/actions Yes No

1 Is connector CN28

connected properly?

Go to step 2. Plug the

connector in
securely.

2 Clean the color drum

sensor LED.
Did this fix the problem?

Problem solved. Replace the

color drum
sensor.
Go to step 3.

3 Did replacing the color

drum sensor fix the
problem?

Problem solved. Replace the

printer controller
board.

Step Questions/actions Yes No

1 Is connector CN27

connected properly?

Go to step 2. Plug the

connector in
securely.

2 Clean the black drum

sensor LED. Did this fix the
problem?

Problem solved. Replace the

blac k drum
sensor.
Go to step 3.

3 Did replacing the black

drum sensor fix the
problem?

Problem solved. Replace the

printer controller
board.

Diagnostic information 2-15

5055-xxx

936 - 939 Cassette Error

940 - High-Capacity Feed Sensor Error

941 - High-Capacity Feed Tray Error

936 Service
Paper Option

Step Questions/actions Yes No

1 Are connectors CN35 and

CN36 on the printer
controller board connected
properly?

Replace the
printer controller
board.

Plug the
connector in
securely.

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.

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.

2-16 Service Manual

5055-xxx

942 - Duplex Error

945 - Engine Flash Error

Reflash the engine code.

946 - Printer/Printhead Controller Board Communication Error

942 Service
Duplex

Step Questions/actions Yes No

1 Is connector CN37 on the

printer controller board
connected properly?

Replace the
printer controller
board.

Plug the
connector in
securely.

945 Service
Engine Flash

946 Service
Communication

Step Questions/actions Yes No

1 Make sure all printhead

LED EPROMS are present
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?

Problem solved. Replace the

printer controller
board.

Diagnostic information 2-17

5055-xxx

947 - Finisher Communication Error

948 - Machine ID Error

Step Questions/actions Yes No

1 Are the finisher to printer

interface cable and power
cable properly connected?

Go to step 2. Properly connect

the cable.

2 Replace th e interface cab le.

Did this resolve the
problem?

Problem solved. Replace the

control finisher
board. Go to
step 3.

3 Did finisher control board

replacement resolve the
problem?

Problem solved. Replace the

printer control
board.

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?

Replace the
printer controller
board.
Go to step 3.

Install the
EPROMs
correctly.

3 Did replacing the printer

controller board fix the
problem?

Problem solved. Replace the

printhead
controller board.

2-18 Service Manual

5055-xxx

949 - Tray (x) Comm

950 - Pr Control Board

Replace the printer controller board.

952 - NVRAM Chip Failure

954 - NVRAM CRC Failure

Replace the RIP board.

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.

952 Service
NVRAM Failure

Step Questions/actions Yes No

1 Make sure the 80-pin RIP

printer controller cable is
not broken or damaged.

Is the cable broken or
damaged?

Replace the
cable.

Go to step 2.

2 Is EPROM U5 present on

the printer controller board?

Replace the
printer controller
board.

Install EPROM
U5

Diagnostic information 2-19

5055-xxx

955 - Code CRC

Replace the RIP board.

956 - Processor Failure

Replace the RIP board.

957 - ASIC Failure

Replace the RIP board.

958 - NAND Failure

Replace the RIP board.

960 - RAM Slot 1 Bad

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

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

955 Service
Code CRC <loc>

956 Service
System Board

958 Service
NAND Failure

960 Service
RAM Memory Error

964 Service
Emulation Error

2-20 Service Manual

5055-xxx

970 - Standard Network Error

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 Programming Network Card

Software error.

979 - Flash Parts Failed While Programming Network Port

Reflash network port.

970 Service
Standard Network

970 Service
Network Card x

Diagnostic information 2-21

5055-xxx

980 - Face Up/Down Switching Error

980 Service
Switch Error

Check Area
B

Step Questions/actions Yes No

1 Does the Face Up/Down

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

Go to step 2. Go to step 3.

2 Manually operate the FU/

FD deflector.
Does it properly l ock into

position when manually
operated?

Go to step 3. Go to step 4.

3 Is there continuity on the

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

Go to step 5. Replace the FU

exit assembly.

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?

Replace the FU
exit assembly.

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

5 Is fuse 1 on the printer

controller board open?

Replace the
printer controller
board and drum
eraser cable
assembly.

Replace the
printer controller
board.

2-22 Service Manual

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.

Go to step 2. Update the

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

2 Are connectors CN409 and

CN407 on the sensor b oard
connected properly?

Go to step 3. Plug the

connectors in
securely.

3 Are connectors CN26 and

CN29 on the printer
controller board connec ted
properly?

Go to step 4. Plug the

connector in
securely.

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 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/do wn
changing shaft.

5 Clean the belt up/down

sensor. Does this fix the
problem?

Problem solved. Go to step 5.

Diagnostic information 2-23

5055-xxx

982 - Sensor Controller Error

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?

Replace the belt
up/down clutch.
Go to step 7.

Replace the belt
up/down sensor.

7 Did replacing the belt up/

down clutch fix the
problem?

Problem solved. Replace the

printer controller
board.

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.

Step Questions/actions Yes No

2-24 Service Manual

5055-xxx

983 - Black Gear Sensor Error

984 - Yellow Gear Sensor Error

983 Service
Gear Sensor

Step Questions/actions Yes No

1 Is connector CN20 on the

printer controller board
connected properly?

Go to step 2. Plug the

connector in
securely.

2 Check the cable running to

CN20 for damage.
Is the cable damaged?

Replace the
cable.

Go to step 3.

3 Clean the gear sensor.

Does this correct the
problem?

Problem solved. Go to step 4.

4 Replace the sensor card.

Did this resolve the
problem?

Problem solved. Replace the

drive unit.

Step Questions/actions Yes No

1 Is connector CN20 on the

printer controller board
connected properly?

Go to step 2. Plug the

connector in
securely.

2 Check the cable running to

CN20 for damage.
Is the cable damaged?

Replace the
cable.

Go to step 3.

3 Clean the gear sensor.

Does this correct the
problem?

Problem solved. Go to step 4.

4 Replace the sensor card.

Did this resolve the
problem?

Problem solved. Replace the

drive unit.

Diagnostic information 2-25

5055-xxx

985 - Transfer Belt Thermistor Error

986 - Transparency (OHP) Sensor Error

985 Service
Thermistor Error

Step Questions/actions Yes No

1 Are connectors CN407 and

CN408 on the sens or board
connected properly?

Go to step 2. Plug the

connector in
securely.

2 Is connector CN29 on the

printer controller board
connected properly?

Replace the
transf er belt unit.
If the problem
remains, replac e
the printer
controller board.

Plug the
connector in
securely.

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?

Go to step 2. Plug the

connector in
securely.

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?

Replace the
printer controller
board.

Replace the
upper and lower
transparency
sensor.

2-26 Service Manual

5055-xxx

992 - Temperature/Humidity Sensor Error

993 CPU Error

Replace the printer controller board.

Step Questions/actions Yes No

1 Is connector CN3 on the

printer controller board
connected properly?

Go to step 2. Plug the

connector in
securely.

2 Replace the temperat ure

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

Problem solved. Replace the

printer controller
board.

Diagnostic information 2-27

5055-xxx

994 - Density Sensor Error

Step Questions/actions Yes No

1 Is the front door fully

closed?

Go to step 2. Close the front

door.

2 Is the density sensor

actuator stuck in place?

Release the
density sensor
actuator.

Go to step 3.

3 Are connectors CN406 and

CN407 on the sens or board
connected properly?

Go to step 4 Plug the

connector in
securely.

4 Is connector CN29 on the

printer controller board
connected properly?

Replace the
density sensor.
Go to step 5.

Plug the
connector in
securely.

5 Did replacing the density

sensor fix the problem?

Problem solved. Replace the

printer controller
board.

2-28 Service Manual

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?

Clear the paper
path.

Go to step 2.

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?

Go to step 3. Properly connect

the cables.

3 Make sure the finisher set

swit ch is activated.
Measure fo r +24 V dc
(±10%) between p ins 7 and
8 and +5 V dc (±10%)
between pins 7 and 6 on
the feed motor assembly
cable connector CN1. Is
either voltage missing?

Go to step 4. Go to step 5.

4 Disconnect the feed motor

assemb ly cable and PJ6 on
the finisher control board.
Measure continuity on the
cable for all positions. Is
there continuity?

Go to step 6. Replace the

cable.

5 Replace the feed motor

assembly. Did this resolve
the problem?

Problem solved. Replace the

finisher control
board.

Diagnostic information 2-29

5055-xxx

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 the
power supply.

Replace the
finisher control
board.

Step Questions/actions Yes No

2-30 Service Manual

5055-xxx

996 - Finisher Jogging Motor Error

Step Questions/actions Yes No

1 Are there foreign objects or

obstructions in the jog gin g
assembly?

Clear the ob jects
or obstruction.

Go to step 2.

2 Are the jogging motor

connectors CN2 on the
finisher control board
securely connected?

Go to step 3. Securely

connect the
connectors.

3 Make sure the finisher set

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

Go to step 4. Go to step 5.

4 Replace the jogging motor

assembly. Did this resolve
the problem?

Problem solved. Replace the

finisher control
board.

5 Disconnect CN2 and PJ5.

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

Go to step 6. Replace the

cable.

6 Check for +24 V dc (±10%)

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

Replace the
finisher control
board.

Replace the
power supply.

Diagnostic information 2-31

5055-xxx

997 - Finisher Tractor Motor Error

Step Questions/actions Yes No

1 Are there obstructions or

foreign obj ec ts in the
accumulator or face down
paper path?

Remove the
objects or
obstructions.

Go to step 2.

2 Are the connectors CN3 at

the tractor motor and PJ4
on the finisher contro l board
securely connected?

Go to step 3. Securely

connect the
connectors.

3 Make sure the finisher set

switch is ac tivated.
Measure +24 V dc betw een
pin 1 of tractor motor
connector CN3 and frame
ground. Is +24 V dc
(±10%)?

Go to step 4. Go to step 5.

4 Replace the tractor motor

assembly. Did this resolve
the problem?

Problem solved. Replace the

finisher control
board.

5 Disconnect CN3 and PJ4

on the finisher contro l board
and perform a continuity
check on all positions. Is
there continuity on all
positions?

Go to step 6. Replace the

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 the
finisher control
board.

Replace the
power supply.

2-32 Service Manual

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?

Go to step 2. Properly connect

the connectors.

2 Make sure that the finisher

set switch is activated.
Power the printer off.
Measure for approximately
+24 V dc (±10%) between
pins 1 and 2 of connector
CN4 at the tray elevator
motor. P o wer 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?

Replace the tray
elevator motor.

Go to step 3.

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 pi n 8. Is there
continuit y in both locations?

Go to step 4. Replace the

cable.

4 Measure for +24 V dc

(±10%) between p ins 1 and
2 on connector PJ6. Is +24
V dc present?

Replace the
finisher control
board.

Replace the
finisher power
supply.

Diagnostic information 2-33

5055-xxx

999 - Stapler Motor Error

Step Questions/actions Yes No

1 Are staples jammed in the

stapler?

Go to step 2. Go to step 3.

2 Clear the staple jam and

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

Replace the
staple cartridge
and to go step 4.

Problem solved.

3 Are the connectors CN5 on

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

Go to step 5. Securely

connect the
connectors.

4 Did replacement of the

stapler cartridge resolv e the
problem?

Problem
resolved.

Replace the
stapler.

5 Make sure the finisher set

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

Replace the
stapler.

Replace the
finisher control
board.

6 Did replacement of the

finisher control board
correct the problem?

Problem solved. Go to step 7.

7 Is there continuity on the

stapler to finisher control
board cable?

Replace the
power supply.

Replace the
cable.

2-34 Service Manual

5055-xxx

Attendance messages

Message Meaning Action

Activating
Menu Changes

The printer is activating
changes made to the printer
settings.

Wait for the message to
clear.

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

bin.

Busy The printer is busy recei ving,

processing, or printing data.

Wait f or the m essage to clear
or press Menu to open the
Job Menu and cancel the
current job.

Canceling Fax The printer is processing a

request to cancel a fax job.

Wait for the message to
clear.

Canceling Job The printer is processing a

request to cancel the current
print job.

Wait for the message to
clear.

Change <x> The printer is requesting a

different type of paper.

Change paper.

Check
<device>
connection

• The specified d evice is n ot
fully connected.

• Hardware failure.

• 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.

Wait for the message to
clear.

Diagnostic information 2-35

5055-xxx

Close Side
Door

The printer side door is
open.

Close the printer side door . If
the error cannot be res et , go
to “Map 1 - False Sid e Door

Open message” on
page 2-54.

Close Fr o nt
Door

The printer front door is
open.

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 Tray <x>
Top Cover

The high-capacity feeder
door is open.

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.

Copying The printer is processing a

copy job originating f rom the
scanner.

Wait for the message to
clear.

Defragmenting The printer is defragmenting

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

Wait for the message to
clear.

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

Delete All Jobs The printer is requesting

confirmation to delete all
held jobs.

• Press Go to c ontinue . The
printer deletes all held
jobs.

• Press Stop to cancel the
operation.

Deleting Jobs The printer is dele ting one or

more held jobs.

Wait for the message to
clear.

Disabling
Menus

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

Wait for the message to
clear.

Note: While the menus are
disabled, you cannot change
the printer settings from the
operator panel.

Message Meaning Action

2-36 Service Manual

5055-xxx

Disk Corrupted
Reformat?

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

• 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.

Disk Recovery
x/5 yyy%

The printer is attempting to
recov er the hard disk .

Wait for the message to
clear.

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

Enabling
Menus

The printer is responding to
a request to ma ke the men us
ava il able to all users.

Wait f or the m essage to clear
and press Menu to view the
menus available.

Engine
Warming

The printer is warming the
fuser assembly.

Wait for the message to
clear.

Enter PIN:
=______

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

Use the operator panel
buttons to enter the PIN.

Fax <x> T he print er is processing an

incoming fax.

Wait for the message to
clear.

Flushing Buffer The printer is flushing

corrupted print data and
discarding the current print
job.

Wait for the message to
clear.

Formatting
Disk yyy%

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

Wait for the message to
clear.

Formatting
Flash

The printer is formatting
flash memory.

Wait for the message to
clear.

Fuser
Maintenance

The counter that tr ac ks w ear
on the fuser has reached its
limit.

• Press Go to continue
printing.

• If print quality is
unacceptable, replace the
fuser.

Message Meaning Action

Diagnostic information 2-37

5055-xxx

Held Jobs May
be Lost

The printer memory is too
full.

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

• Press Stop to clear the
message w ithout deleting
jobs.

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

Infrared <x> An infrared interface is the

active communication link.

Wait for the message to
clear.

Insert Tray <x> The specified tray is either

missing or not fully inserted.

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

servi ce check” on
page 2-83.

Install
<device> or
Cancel Job

The printer is requesting a
specified device be installed
so it can print.

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

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

Invalid Engine
Code

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

Call for service.

Inva lid Network
<x> Code

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.

Download valid code to the
printer internal print server .

Message Meaning Action

2-38 Service Manual

5055-xxx

Load <x> The printer is trying to feed

paper from a source it
detects is empty.

Load paper of the size and
type requested i n the second
line of the displa y 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 Manual A request for a manual feed

job has been sent to the
printer. The printer is ready
for ins ertion of a sing le shee t
into the manual f eed slot.

• 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 paper
already in the printer.

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

LocalTalk <x> A LocalTalk interface is the

active com munication link.

Wait for the message to
clear.

Menus
Disabled

The printer menus are
disabled.

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.

Network Card
Busy

An internal print server is
being reset.

Wait for the message to
clear.

Network <x> A network interface is the

active com munication link.

Wait for the message to
clear.

Message Meaning Action

Diagnostic information 2-39

5055-xxx

Network
<x>, <y>

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

Wait for the message to
clear.

No Jobs
Found, Retry?

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

• Press Go to enter anothe r
PIN.

• Press Stop to clear the
PIN entry prompt.

Not Ready The printer is not ready to

receive or process data.

Press Go to make the printer
ready.

Parallel <x> A parallel interface is the

active communication link.

Wait for the message to
clear.

Performing Self
Test

The printer is running the
series of start-up tests it
performs after it is turned on.

Wait for the message to
clear.

Power Saver The printer is ready to

receive data. It is reducing
electricity consum ption whil e
idle.

• Send a job to the printer.

• Press Go to quickly warm

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

Print Jobs on
Disk

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

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

delete jobs.

Printer
Calibrating

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

Wait for the message to
clear.

Printing
Alignment
Page

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

Wait for the message to
clear.

Printing
Directory List

The pr inter is processing or
printing a directory of all files
stored in f lash memo ry or on
a hard disk.

Wait for the message to
clear.

Message Meaning Action

2-40 Service Manual

5055-xxx

Printing Font
List

The printer is processing or
printing a list of all available
fonts for the specified printer
language.

Wait for the message to
clear.

Printing Job
Accounting
Stat

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

Wait for the message to
clear.

Printing Menu
Settings

The printer is processing or
printing the menu setting s
page.

Wait for the message to
clear.

Prog Engine
Code

The printer is programming
new code into flash memory.

Wait for the message to
clear.

Prog System
Code

The printer is programming
new system code.

Wait for the message to
clear.

Program Flash The printer is storing

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

Wait for the message to
clear.

Programming
Disk

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

Wait for the message to
clear.

Programming
Error <x>

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

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

Queuing and
Deleting Jobs

The printer is deletin g one or
more held jobs and sending
one or more jobs to print.

Wait for the message to
clear.

Queuing Jobs The printer is sendin g one or

more held jobs to print.

Wait for the message to
clear.

Ready The printer is ready to

receive and process print
jobs.

Send a job to print.

Message Meaning Action

Diagnostic information 2-41

5055-xxx

Ready Hex The printer is in Hex Trace

mode and is ready to re ceive
and process print jobs.

• 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.

Remov e Paper
<specified bin>

The specified output bin is
full.

Remove the paper from the
specified bin(s).

Resetting
Maint Cnt
Value

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

Wait for the message to
clear.

Resetting the
Printer

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

Wait for the message to
clear.

Restore Held
Jobs. Go/
Stop?

The printer has been r eset or
has been turned on and the
printer detects print and ho ld
jobs stored on the hard disk.

Press Go. All jobs on hard
disk are restored.

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

Restoring
Factory
Defaults

The pr inter is restoring
factory default settings.

Wait for the message to
clear.

Restoring Held
Jobs

The printer is restoring held
jobs from the hard disk.

Wait for the message to
clear.

Serial <x> A serial interface is the

active communication link.

Wait for the message to
clear.

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

to clear the message.

Supplies One of the printer supplies

requires attention.

Press Menu to open the
Supplies Menu and identify
which supply item needs
replacing.

Message Meaning Action

2-42 Service Manual

5055-xxx

Tray <x>
Empty

The specified tray is out of
paper.

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.

Tray <x> Low The specified tray is low of

paper.

Add paper in the tr ay and try
to clear the message. If the
message canno t be reset, go
to “Map 4 - False Tray (x)

Low/Empty message” on
page 2-56.

Tray <x>
Missing

The specified tray is either
missing or not fully inserted.

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

missing service check” on
page 2-83.

Unsupported
Disk

The printer detects an
unsupported disk.

• Press Go to clear the
message.

• Format the disk.

USB <x> T he print er is processing

data through the specified
USB port.

Wait for the message to
clear.

Waiting The printer is waiting for an

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

• 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

The download emulator
version on th e firmware card
does not match the printer
code version.

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

2 <xx> Paper
Jam

The printer detects a paper
jam.

Clear the paper path. If the
message canno t be reset, go
to the “Paper carrying

service check” on
page 2-74.

Message Meaning Action

Diagnostic information 2-43

5055-xxx

30 Coating Roll
Missing

The oil coating roll is either
missing or installed
incorrectly.

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.

30 <color>
Print Unit
Missing

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

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.

32
Unsupported
<color>
Cartridge

The printer detects an
unsupported toner cartridge.

Replace the cartridge.

33 Tray <x>
Config Error

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

Remove the heavy media
tray from the invalid location.

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

message.

• Make sure the paper size
setting in the P ape r Men u
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

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

• Press Go to disable
Resource Save and
continue printing.

• Install additional memory.

37 Insufficient
Collation Area

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

• 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.

Message Meaning Action

2-44 Service Manual

5055-xxx

37 Insufficient
Defrag
Memory

The printer cannot
defragment flash memory.

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

• Install additional printer
memory.

37 Insufficient
Memory

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

• Press Go to clear the
message and conti n ue
printing.

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

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

38 Memory
Full

The pri nter is processing
data, but the memory is full.

• Press Go to clear the
message and conti n ue
printing.

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

39 Complex
Page

The print info rmation on the
page is too complex.

• Press Go to clear the
message and conti n ue
printing.

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

4 <x>
Unsupported
Firmware Card

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

• Turn the printer off and
then press and hold Go
while turning it on,
bypassi ng the code o n the
firmware card.

• Remove the firmware
card.

Message Meaning Action

Diagnostic information 2-45

5055-xxx

40 Tray <x>
Size Sense
Error

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

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

• Check the high-capaci ty
feeder size sensor and go
to

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

41 Open Bin 1
Exit Tray

The pr inter wants to send
paper to the b in 1 output tra y,
but the tra y is closed .

• 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.

51 Defecti ve
Flash

The printer detects de fective
flash memory.

• Press Go to clear the
message and continue
printing.

• Install different flas h
memory before
downloading.

52 Flash Full There is not enoug h free

space in flash memory.

• 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 capac ity.

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.

Message Meaning Action

2-46 Service Manual

5055-xxx

54 Serial
Option <x>
Error

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

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

• Press Go to clear the
message and conti n ue.

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

54 Network
<x> Software
Error

54 Standard or
Std <x>
Software Error

The printer cannot establish
communications with an
installed netw o rk port.

• Press Go to clear the
message and conti n ue
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.

54 Std Par
ENA
Connection
Lost

54 Par <x>
ENA
Connection
Lost

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

• 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 conti n ue
printing.

56 Serial Port
<x> Disabled

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

• Press Go to clear the
message.

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

56 Pa rallel P ort
<x> Disabled

56 Std Parallel
Po rt Disabled

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

• Press Go to clear the
message.

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

Message Meaning Action

Diagnostic information 2-47

5055-xxx

56 USB Port
<x> Disabled

56 Std USB
Port Disabled

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

• Press Go to clear the
message.

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

58 Too Many
Bins Attached

Too many output bins are
installed.

Unsupported output bins are
installed.

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

58 Too Many
Disks Installed

Too many disks are installed. Turn off and unplug the

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

58 Too Many
Flash Options

Too many flash options are
installed.

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

58 Too Many
Trays Attached

Too many trays are installed. Turn off and unplug the

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

61 Defecti ve
Disk

The printer detects a
defective hard disk.

• Press Go to clear the
message and continue
printing.

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

62 Disk Full Insuffic ien t mem ory on the

hard disk.

• Press Go to clear the
message and continue
printing.

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

Message Meaning Action

2-48 Service Manual

5055-xxx

63
Unformatted
Disk

The printer detects an
unformatted hard disk.

• Press Go to clear the
message and conti n ue
printing.

• Format the disk before
performing disk
operations.

• Replace the hard disk.

64
Unsupported
Disk Format

The printer detects an
unsupported disk format.

• Press Go to clear the
message.

• Format the disk.

80 Belt
Exhausted

The transfer belt has
reached end of life.

Replace the transfer belt.

80 Belt/Fuser
Exhausted

The transfer belt and fuser
have reached end of life.

Replace the tran sfer belt and
fuser.

80 Belt/Fuser
Life Warning

The transfer belt and fuser
are nearing end of life.

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

80 Belt Life
Warning

The transfer belt is nearing
end of life.

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

80 Fuser
Exhausted

The fuser has reached end
of life.

Replace the fuser.

80 Fuser Life
Warning

The fuser is nearing end of
life.

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

81 Engine
Code CRC
Failure

Microcode in the engine
flash code mo dule ha s failed
a system check.

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

Message Meaning Action

Diagnostic information 2-49

5055-xxx

84 All Photo
Devs
Exhausted

All of the photodevelopers
have reached end of life.

Replace all of the
photodevelopers. Make sure
you also install the new fuser
coating roll that is incl uded in
each photode veloper kit.

84 Black Photo
Dev Abnormal

The printer has detected an
abnormal black
photodeveloper.

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

84 Black Photo
Dev Exhausted

The black photodeveloper
has reached end of life.

Replace the black
photodeveloper. Make sure
you also install the new oil
coating roll that is incl uded 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 printin g.

84 Black Photo
Dev Life
Warning

The blac k pho todeveloper is
nearing end of life.

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.

Message Meaning Action

2-50 Service Manual

5055-xxx

84 Color Photo
Devs
Exhausted

The color photodevelopers
have reached end of life.

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

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

84 <Color>
Photo Dev Life
Warning

The color photodevelopers
are nearing end of life.

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

85 Toner
Empty
Coatin g Roll
Exhausted

88 Black Toner
Empty

The oil coating roll has
reached end of life.

The black toner cartridge is
empty. See note below.

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
Coatin g Roll

Abnormal coating roll
Installed.

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

85 Coating Roll
Life Warning

Coating roll is nearing it’s
expec ted lif t.

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

84 <color>
Photo Dev
Abnormal

Abnormal photodeveloper
installed

Install correct
photodeveloper.

Message Meaning Action