Lexmark 4250, 4270 Service Manual

Lexmark 4200 Series

• Table of Contents

• Start Diagnostics

All-In-One

4413-XXX

• Safety and Notic es

• Trademarks

•Index

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

4413-XXX

Edition: March 2004
The following paragraph doe s not apply to any c ountry where such provisions are

incons is te nt with loc a l law: LEXMARK INTERNATIONAL, INC. PROVIDES THIS

PUBLICATION “AS IS” WIT HO U T WARRANTY OF ANY KIND, EITHER EXPRESS OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO , THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do
not allow disclaimer of express or implied warranties in certain transactions; therefore, this
statement may not apply to you.

This publication could include technical inaccuracies or typogr aphical errors. Changes are
periodically made to the information herein; these changes will be incorporated in later
editions. Improvements or changes in the products or the programs described may be
made at any time.

Comments may be addressed to Lexmark International, Inc., Department D22A/032-2,
740 West New Circle Road, Lexington, Kentucky 40550, U.S.A or e-mail at
[e-mail]. Lexmark may use or distribute any of the
information you supply in any way it believes appropriate without incurring any obligation
to you. You can purchase additional copies of publications related to this product by
calling 1-800-553-9727. In other countries, contact your point of purchase.

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

Other trademarks are the property of their respective owners.

© Copyright Lexmark International, Inc. 2004.
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
expanse.

USA P/N 12G9334

Japanese P/N 12G9335

4413-XXX

Table of Contents

Safety information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. x

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

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Print engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Printhead. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Facsimile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Scanner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Power and size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

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

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

Power-On Self Test (POST) sequence. . . . . . . . . . . . . . . . . . 2-1

POST symptom table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Symptom tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Service checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Carrier transport service check . . . . . . . . . . . . . . . . . . . . . . . . 2-6

CIS assembly service check. . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Scanner motor with gear assembly service check . . . . . . . . . 2-9

Maintenance stati on se rv ice check. . . . . . . . . . . . . . . . . . . . 2-10

Paper feed service check . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Paper path service check . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Power service check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Print quality service check. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Scan/copy quality service check . . . . . . . . . . . . . . . . . . . . . . 2-17

Fax/telephone communication service check . . . . . . . . . . . . 2-18

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

Theory of mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Scanner mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Drive feed roller assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Contact Image Sensor (CIS). . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Document sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

iii

4413-00X

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

Handling ESD-sensitive parts . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Removal procedu res . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Releasing plastic latches . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Removals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

General precautions on removals . . . . . . . . . . . . . . . . . . . . . .4-3

CIS white roller assembly removal. . . . . . . . . . . . . . . . . . . . . .4-4

Top cover assembly removal . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

Rollers (drive feed roller assembly, exit shaft) removal . . . . . .4-6

CIS (Contact Image Sensor) removal . . . . . . . . . . . . . . . . . .4-10

Scanner motor with gear assembly removal . . . . . . . . . . . . .4-11

Control panel assembly removal . . . . . . . . . . . . . . . . . . . . . .4-13

Print engine removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Maintenance station removal . . . . . . . . . . . . . . . . . . . . . . . . .4-17

Carrier assembly with belt removal . . . . . . . . . . . . . . . . . . . .4-18

System board removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

Exit rollers removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-20

Large feed roller assembly with gear removal . . . . . . . . . . . .4-21

Paper feed motor assembl y with gears rem ov al . . . . . . . . . .4-23

Carrier transport motor removal . . . . . . . . . . . . . . . . . . . . . . .4-24

Handset and cradle removal . . . . . . . . . . . . . . . . . . . . . . . . .4-24

Connector locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

System board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

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

Lubrication specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

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

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

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

iv Service Manual

Safety information

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

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

• The maintenance information for this product has been

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

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

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

4413-XXX

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.

Safety information v

4413-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.

vi Service Manual

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.

4413-XXX

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.

Safety information vii

4413-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.

viii Service Manual

4413-XXX

Safety information ix

4413-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 in this chapter, as well as
general environmental and safety instructions.

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

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

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

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

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

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

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.

x Service Manual

4413-XXX

1. General information

The Le xmark™ 4200 Series All-In-One (4413-XXX) is a letter quality
print, fax, copy, and scan machine. It is a standalone color/mono
copier and fax. The printhead uses small heater plates and nozzles
to control ink flow and the formation of characters on the print media.
The printhead assembly and ink supply are combined into a single
unit. Print cartridges are available as a customer replaceable supply
item. Dual printheads provide color and true black printing without
changing printheads. The number and size of inkjets or nozzles, in
the printhead, determines the overall quality and capability of the
printer. The black cartridge has a total of 208 nozzles and installs on
the right. The color cartridge has a total of 192 nozzles and installs
on the left. The printer is capable of printing in both directions from
either cartridge.

4250 4270

4413-K01 4413-K03
4413-AK1 (DBCS) 4413-AK3 (DBCS)
No handset Handset

General information 1-1

4413-XXX

Specifications

Print engine

Technology Thermal Inkjet

2-pin and printhead swapping
type

Speed Color 10 ppm at Draft Mode

Mono 17 ppm at Draft Mode

Resolution Color/Mono Quick Print: 300 x 600 dpi

Normal: 600 x 600 dpi
Better: 1200 x 1200 dpi
Best: 4800 x 1200 dpi for

photo paper

Best: 2400 x 1200 dpi for

other paper
Printing Width 203 mm
Feedin g Method Automati c 100 sheets of 20 lb c ut she ets

(Max 10 mm)

Manual Tray No
Emulation Host Based Printing (GDI)
Printer Driver Windows 98/ME, Win do w s

2000/Windows XP

Interface USB Interface

Printhead

Babbage Mono Standard Birch Color

Printhead 208 nozzles 192 nozzles
Ink Type Pigment Dye
Ink Color Black Color
Ink Yield About 600 sheets About 450 sheets

1-2 Service Manual

4413-XXX

Facsimile

General Scan Method CIS

Scan Width Maximum 216 mm, Minimum 76.2 mm
Feeding Method Sheet Feed
ADF 30 sheets of 20 lb
Guide Document Input Guide
Stacke r Document Output Stack er/Paper

Paper Tray Bin Type (without Manual Tray)
Modem Speed 33.6 Kbps
LCD 2 lines of 16 characters each

Stacker

Scanning Resolution Optical Resolution: 600 dpi (H) x 1200

dpi (V)
Interpolated: 9600 dpi x 9600 dpi

Contrast Darkest/Darken/Normal

Lighten/Lightest

Telephone Speed Dial 79 locations

On-Hook Dial Yes
Last Number Redial Yes
Auto Redial Yes
Ringer Volume S/W Option Setting (4 steps)
Tone/Pulse Select S/W Option Setting

Report and
List

Telephone Number
List

Self Test Yes

Yes

Copy Multipage Copy Up to 99 pages

Grayscale 256 levels
Reduction and

Enlargement

25% - 200%
(Reference is the top center of
document.)

General information 1-3

4413-XXX

Telephone
I/F

Others Sensors Paper Jam

Answering I/F Yes
Extension Phone 1-jack, extension phone transfer

Clock Yes

Scanner

Compatibility TWAIN
Technology Platen CIS
Light Source for Color CIS RGB LEDs (Line Order Control)

Power and size

Power Source 100V-127V with 2-wire power cord fixed

100V-127V with 2-wire separate pow er
cord (Japan)
220V-240V with 2-wire AC inlet separate
power cord
Energy Star Compliant (with 1 watt

regulation)
Dimensions 440.6 X 319.6 X 205.4 mm
Weight (Packed) 15.3 lbs (Packed Weight)

1-4 Service Manual

4413-XXX

Abbreviations

AIO All-In-One
ASF Auto Sheet Feed
B/M Bill of Material
CIS C onta ct Imag e Sensor
EOF End of Form
ESD Electrostatic Discharge
FPC Flat Printhead Cable
FRU Field Replaceable Unit
GDI Graphic Display Interface
HVPS High Voltage Power Supply
LCD Liquid Crystal Display
LVPS Low Voltage Power Supply
OEM Original Equipment Manufacturer
V ac Volts alternating current
V dc Volts direct current
ZIF Zero Insertion Force

General information 1-5

4413-XXX

1-6 Service Manual

4413-XXX

2. Diagnostic information

Start

Power-On Self Test (POST) sequence

1. Lexmark 4200 Series is displayed on the LCD.

2. Power, Fax, Copy, Scan and Auto Answer lights turn on.

3. Copy and Scan button lights turn on.

4. Carrier moves to the left and returns to the maintenance station.
The paper feed motor runs then stops.

5. Enter Fax Number is displayed.

6. Date and Time display when POST is complete.

If your printer completes POST with errors, go to the “Symptom

tables” on page 2-3. Locate the symptom and take the indicated

action.
If your printer does not complete POST, locate the symptom in the

following table and take the indicated action.

Diagnostic information 2-1

4413-XXX

POST symptom table

Symptom Action

LCD or Control
Panel buttons do
not work and no
motors run

Paper feed
gears do not
turn

Carrier does not
move

Carrier slams
side frame

CIS light does
not turn on

Go to the “Power service check” on page 2-14. If okay,
go to the “Control panel problems” on page 2-3.

Go to the “Paper feed service check” on page 2-11.

Go to the “Carrie r transp ort service che c k” on

page 2-6.

Go to the “Carrie r transp ort service che c k” on

page 2-6.

Go to the “CIS assembly service check” on page 2-8.

2-2 Service Manual

4413-XXX

Symptom tables

Locate the symptom in the following tables and take the appropriate
action.

Carrier transport problems

Symptom Action

• No carrier movement

• Slow carrier movement

• Carrier stops

• Carrier slams side frame

Go to the “Carrier transport

service chec k” on page 2-6.

Maintenance station problems

Symptom Action

Maintenance station:

• Fails to cap the printheads

• Fails to clean the printheads

Go to the “Maintenance station

service chec k” on page 2-10.

Control panel problems

Symptom Action

• Buttons do not work

• LCD does not display

Check control panel cable
connection at CN5 on the system
board. Run the “Power-On Self

Test (POST) sequence” on
page 2-1. If the LCD or buttons fail,

check connection CN5. If the
problem remains , r eplace t he contro l
panel assembly. Go to the “Control

panel assembly removal” on
page 4-13.

If the problem still e xists , repla ce the
system board. Go to the “System

board removal” on page 4-19.

Diagnostic information 2-3

4413-XXX

Symptom Action

Document scan sensor does not
detect document

Check con trol p anel cab le conn ector
CN5 on the system b oard. If oka y, go
to the “Scanner motor with gear

assembly service check” on
page 2-9. If the scanner motor is

working correctly, replace the control
panel assembly. Go to the “Control

panel assembly removal” on
page 4-13.

Printer communication problem

Symptom Action

Not able to print Self Test Page Check the USB cable and system

board cable connections. If okay,
replace system board. Go to the

“System board removal” on
page 4-19.

Phone handset/cradle problem

Symptom Action

No dial tone
Handset does not work

Check all phone connections. Be
sure the main phone connection is
connected to the printer.Check pins
5 and 6 for approximately 3 volts on
connector CN11 located on the
system board. If voltage is not
correct, replace the syste m boa rd.
Go to the “Syste m b oard removal”

on page 4-19. If problem still exists,

replace the handset and cradle. Go
to “Handset and cradle removal”

on page 4-24.

2-4 Service Manual

4413-XXX

Scanner problems

Symptom Action
Light does not turn on Go to the “CIS assembly service

check” on page 2-8.

• Scanned images are faded, or
colors are dull, blurry or fuzzy.
Images are slanted or crooked
and the straight lines in the
image appear to be jagged or
uneven.

• Blank copies

• Scanner motor does not run

• Document sensor does not

work

• CIS white roller assembly slips

• Paper does not feed correctly

Go to the “Scan/copy quality

service chec k” on page 2-17.

Go to the “Scanner motor with

gear assembl y servi ce c heck” on
page 2-9.

Go to the “Control panel

problems” on page 2-3.

Go to the “Paper path service

check” on page 2-13.

Paper feed problems

Symptom Action

• Fails to pick paper

• Picks more than one sheet of

paper

• Picks paper but fails to feed

• Paper jams

• Paper fails to exit

• Noisy paper feed

Envelopes fail to feed Go to the “Paper feed service

Paper skews Go to the “Paper path service

Go to the “Paper feed service

check” on page 2-11.

check” on page 2-11.

check” on page 2-13.

Diagnostic information 2-5

4413-XXX

Power problems

Symptom Action

No power in machine, motors do
not operate

Go to the “Power service check”

on page 2-14.

Print quality problems

Symptom Action

• Voids in characters

• Light print

• Prints off the page

• Fuzzy print

• Carrier moves but no print

• Printhead dries prematurely

• Colors print incorrectly

• Vertical alignment off

• Ink smearing

• Vertical streaks on paper

• Print lines crowded

Go to the “Print quality service

check” on page 2-15.

Go to the “Paper feed service

check” on page 2-11.

Service checks

Carrier trans port servi ce check

FRU Action

1 System Board

Carrier Transport
Motor

Check the carrier transport motor connector CN3.
If connected, check for approximately 30 volts on
pins 1 and 3 or at the wire connections located on
the rear of the carrier transport motor. If voltage is
incorrect, replace the system board. If voltage is
correct, check the motor for shorts. If a short is
found, rep lace the mot or . Go to “Carrier transport

motor remov al ” on page 4-24.

2-6 Service Manual

4413-XXX

FRU Action

2 Carrier Transport

Motor

Check the motor for binds, or loose motor pulley.
A noisy or chattering mo tor, or a motor that fails to

turn, can be caused by:

• An open or short in the motor

• An open or short in the motor driver

on the system board

• A bind in the carrier transport

mechanism

With the carrier transport motor cable (CN3)
disconnecte d from the syst em board, che ck for 0
to 16 ohms between the following pins on the
motor:

CN3-2 and CN3-3

If the re adings are incorrect, replace the print
engine. Go to the “Print engine removal” on

page 4-16.

3 Carrier Guide Rod Clean the carrier rod.

Note: Lubricate the rod an d the carrier rod bearing
surfaces with grease P/N 99A0394.

4 Encoder Strip

Carrier Assembly
with Belt

5 Carrier Transport

Belt
Idler Pulley
Assembly

Check the encoder strip for proper installation.
Also , ch eck it for wear, dirt, and grea se. Replace if
needed.

Be sure all printhead connectors are fully seated.
Check the cables for damage.

If the encoder strip and all connections are okay,
but the carrier still slams the side frame, replace
the carrier assembly with belt. Go to the “Carrier

assembly with belt removal” on page 4-18. If

problem rem ains , repl ace the system boa rd. Go to
the “System board removal” on page 4-19.

Check for worn, loose or broken parts. Check for
obstructions blocking carrier movemen t. If pulley
assembly is damaged, replace.

Lubricate carrier to carrier fram e enga gemen t with
grease P/N 99A03 94.

Diagnostic information 2-7