Lexmark 4076-0XX User Manual
ExecJet™ II and ExecJet IIc
• Table of Contents
• Start Diagnostics
• Safety and Notices
• Trademarks
4076-0XX
•Index
• Manuals Menu
Lexmark and Lexmark with diamond
design are trademarks of Lexmark
International, Inc., registered in the
United States and/or other countries.
4076-0XX
Second Edition (May, 1996)
The following paragraph doesnot apply tothe United Kingdom or any country where such
provisions are inconsistent with local law: LEXMARK INTERNATIONAL,INC.PROVIDES
THIS PUBLICATION“AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do
not allow disclaimer of expressor 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 of the publication. Improvements or changes in the products or the programs
described in this publication may be made at any time. Publications are not stocked at the
address given below; requests for publications should be made to your point of purchase.
Comments may be addressed to Lexmark International, Inc., Department D22A/035-3,
740 New Circle Road, Lexington, Kentucky 40550, U.S.A. Lexmark may use or distribute
any of the information you supply in any way it believes appropriate without incurring any
obligation to you.
ExecJet and Lexmark are trademarks of Lexmark International, Inc., registered in the
United States and/or other countries.
AppleTalk and LocalTalk are trademarks of Apple Computer, Inc. registered in the United
States and other countries.
Other trademarks are the property of their respective owners.
© Copyright Lexmark International, Inc. 1994, 1996.
All Rights Reserved.
UNITED STATES GOVERNMENT RESTRICTED RIGHTS
This software and documentation are provided with RESTRICTED RIGHTS. Use,
duplication or disclosure by the Government is subject to restrictions as set forth in
subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause at
DFARS252.227-7013 and in applicable FAR provisions: Lexmark International, Inc.,
Lexington, KY 40550.
4076-0XX
Contents 1
NoticesandSafetyInformation ............................vi
ElectronicEmissionNotices........................... vi
SafetyInformation...................................viii
General Information .....................................1
PowerConsumption...............................1
Options.........................................2
MaintenanceApproach ............................2
Abbreviations....................................3
UniqueToolsRequiredForService...................3
DiagnosticInformation ...................................4
Start..............................................4
ErrorIndicatorTable...............................5
Power-on-self-test (Post) Sequence ..................7
POSTSymptomTable. ............................8
SymptomTables .................................9
CarrierTransportProblems .....................9
ServiceChecks.....................................11
EnvelopeFeedServiceCheck......................11
FirstPrintLineServiceCheck......................11
MaintenanceStationServiceCheck.................12
Operator Panel Service Check......................13
Paper Feed Service Check ........................14
Paper Path Service Check.........................17
ParallelPortServiceCheck........................18
PowerServiceCheck.............................19
PrintQualityServiceCheck........................20
SimmServiceCheck.............................22
TransportServiceCheck..........................22
DiagnosticAids........................................24
DemoTest.....................................24
PrintFontsTest.................................24
PurgeTest.....................................25
PrintNvram ....................................25
TestPage......................................26
Paper Sensor Test ...............................26
Encoder Sensor Test . . ...........................27
HexPrint.......................................27
ParallelPortTest................................28
InitializeNvram..................................28
Serial Adapter Test...............................29
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4076-0XX
Repair Information . . . ...................................30
HandlingEsd-sensitiveParts....................... 30
Adjustments....................................... 31
Bi-directionalAlignmentAdjustment................. 31
RemovalProcedures................................ 32
ReleasingPlasticLatches......................... 32
Auto Sheet Feed (ASF) Assembly Removal ........... 33
ASF Envelope Buckler And Pick Roller Hub Removal . . . 33
ASF Right And Left Edge Guide Assemblies Removal. . . 34
ASF Paper Load Lever Removal.................... 34
CarrierRemoval ................................ 34
CarrierTransportBeltRemoval..................... 35
CarrierGuideRemoval........................... 35
CarrierTransportMotorRemoval................... 35
CarrierTransportMotorFrameRemoval ............. 36
EncoderStripRemoval........................... 36
End-of-formsFlagRemoval........................ 37
ExitRollerAssemblyRemoval ..................... 37
EpromRemoval................................. 37
FeedArmAssemblyRemoval...................... 37
InsideIdlerGearsRemoval........................ 38
LargeFeedRollerAssemblyRemoval............... 38
LeftSideFrameRemoval......................... 39
Maintenance Drive And Rocker Assemblies Removal . . . 40
MiddleFrameRemoval........................... 40
Operator Panel Removal. ......................... 40
OutsideIdlerGearsRemoval...................... 41
Paper Ejectors Removal . ......................... 41
Paper Feed Motor Removal ....................... 41
Paper Guide Removal. . . ......................... 41
Paper Release Lever Removal ..................... 42
Power Supply Removal. . ......................... 42
PrintHeadCableRemoval........................ 43
RightSideFrameRemoval........................ 44
Rubber Backer Removal . ......................... 45
SmallFeedRollerAssemblyRemoval............... 45
StarRollerRemoval ............................. 45
SystemBoardRemoval........................... 46
TopCoverRemoval.............................. 47
Connector Locations . ...................................48
System Board Connectors......................... 48
Preventive Maintenance .................................50
Lubrication Specifications ......................... 50
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PartsCatalog .........................................51
HowToUseThisPartsCatalog.....................51
Assembly1:Covers ..........................52
Assembly2:Frames..........................54
Assembly3:PaperFeed ......................56
Assembly3:PaperFeed(Cont.) ................58
Assembly4:Electronics .......................60
Assembly4:Electronics(Cont.) .................62
Assembly4Electronics(Cont.)..................64
Assembly5:Carrier ..........................66
Assembly6:CarrierTransport ..................68
Assembly 7: Auto Sheet Feed ..................70
Assembly 8: Maintenance Station ...............72
Assembly9:Options..........................74
Index................................................76
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4076-0XX
Notices and Safety Information 2
References in this publication to products, programs, or services
do not imply that the manufacturer intends to make these
available in all countries in which it operates. Any reference to a
product, program, or service is not intended to state or imply that
only that product, program, or service may be used. Any
functionally equivalent product, program, or service that does not
infringe any existing intellectual property rights may be used
instead. Evaluation and verification of operation in conjunction
with other products, programs, or services, except those
expressly designated by the manufacturer, are the user’s
responsibility.
Electronic Emission Notices
Consult the following list for any emission notices that may apply
in your country.
Federal Communications Commission (FCC) Statement
This printer has been tested and found to comply with the limits
for a Class B digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
communications. However, there is no guarantee that
interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and
receiver.
vi
4076-0XX
• Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
• Consult your point of purchase or service representative for
additional suggestions.
The manufacturer is not responsible for any radio or television
interference caused by using other than recommended cables or
by unauthorized changes or modifications to this equipment.
Unauthorized changes or modifications could void the user’s
authority to operate the equipment.
To assure compliance with FCC regulations for a Class B
computing device, use a properly shielded and grounded
Lexmark or IBM parallel interface cable, such as Lexmark part
number 1525612.
Use of a substitute cable not properly shielded and grounded
may result in violation of FCC regulations.
Industry Canada Compliance Statement
This Class B digital apparatus meets all requirements of the
Canadian Interference-Causing Equipment Regulations.
Avis de conformité aux normes d’Industrie Canada
Cet appareil numérique de la classe B respecte toutes les
exigences du Règlement sur le matériel brouilleur du Canada.
The United Kingdom Telecommunications Act 1984
This apparatus is approved under the approval number NS/G/
1234/J/100003 for the indirect connections to the public
telecommunications systems in the United Kingdom.
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4076-0XX
Japanese VCCI Notice
European Community (EC) Electromagnetic Compatibility
Directive
This product is in conformity with the protection requirements of
EC Council directive 89/336/EEC on the approximation of the
laws of the Member States relating to electromagnetic
compatibility.
A declaration of conformity with the requirements of the Directive
has been signed by the Director of Manufacturing and Technical
Support, Lexmark International, Ltd., Boigny, France.
This product satisfies the Class B limits of EN 55022.
Safety Information
• 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 injur y during disassembly and servicing of this
product. Professional service personnel should understand
this and take necessary precautions.
• The safety features of some parts may not always be
obvious. Therefore, replacement parts must have the
identical or equivalent characteristics as the original parts.
viii
4076-0XX
Sicherheitshinweise
• 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.
• Ersatzteile müssen gleiche oder gleichwertige Merkmale wie
die Originalteile aufweisen, da nicht immer offensichtlich ist,
welche Teile des Geräts Sicherheitsmerkmale aufweisen.
Consignes de Sécurité
• 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.
• Les normes de sécurité de certaines pièces n'étant pas
toujours explicites, les pièces de rechange doivent être
identiques ou conformes aux caractéristiques des pièces
d'origine.
Norme di sicurezza
• Le informazioni riguardanti la manutenzione di questo
prodotto sono indirizzate soltanto al personale di assistenza
autorizzato.
• Durantelo 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.
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4076-0XX
• Poiché non tutti i pezzi di ricambio garantiscono la stessa
sicurezza, questi devono avere caratteristiche identiche o
equivalenti a quelle dei pezzi originali.
Pautas de Seguridad
• 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.
• Los dispositivos de seguridad de algunas piezas no siempre
pueden reconocerse a simple vista. Por lo tanto, los
recambios deben poseer características idénticas o
equivalentes a las de las piezas originales.
Informações de Segurança
• As informações de segurança relativas a este produto
destinam-se a profissionais destes serviços e não devem ser
utilizadas por outras pessoas.
• Risco de choques eléctricos e ferimentos graves durante a
desmontagem e manutenção deste produto.Os profissionais
destes serviços devem estar avisados deste facto e tomar os
cuidados necessários.
• Os dispositivos de segurança de algumas peças poderão
não ser sempre suficientemente evidentes. Assim, as peças
sobressalentes devem possuir características idênticas ou
equivalentes às peças originais.
Informació de Seguretat
• La informació pel manteniment d’aquest producte està
orientada exclusivament a professionals i no està destinada
a ningú que no ho sigui.
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4076-0XX
• El risc de xoc elèctric i de danys personals pot augmentar
durant el procés de desmuntatge i de servei d’aquest
producte. El personal professional ha d’estar-ne assabentat i
prendre les mesures convenients.
• Les característiques de seguretat d’algunes de les peces
poden no ser òbvies. Per tant, les característiques dels
recanvis hauran de ser idèntiques o equivalents a les de les
peces originals.
Chinese Safety Information
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4076-0XX
Korean Safety Information
xii
4076-0XX
General Information 3
This manual is used to service both the IBM ExecJet II by Lexmark
4076 and the ExecJet IIc 4076 printers. The ExecJet IIc is capable of
using a color print cartridge or a black print cartridge. The ExecJet II
uses only a black print cartridge.
Both the Execjet II and the ExecJet IIc are general purpose highquality ink jet printers with a customer-replaceable print cartridge
containing the ink and the print head. The black pr int cartridge has a
total of 56 nozzles in the print head and can print at 16.7 ips in Letter
Quality mode and 30.0 ips in Draft m ode. With the black print cartridge installed, the printer prints in two directions with a resolution of
300 x 300 pels per inch in text and graphics. Print Quality Enhancement Technology (PQET) smooths the edges.
The color print cartridge used in the ExecJet IIc has a total of 48
nozzles in the print head using three major colors; cyan, magenta,
and yellow. Printing is from left-to-right with the color print cartridge
installed and print speeds are 12.0 ips in Letter Quality mode and
24.0 ips in Draft mode.
The ExecJet IIc electronically senses for the correct print cartridge
when a print job is sent to the printer. The Ink Low and Busy lights
will flash alternately to indicate to the user the correct print cartridge
must be installed.
Both printers can handle a variety of paper sizes as well as envelopes and other media using an integrated automatic sheet feeder
and manual insert tray.
Power Consumption
• Less than 2 Watts - power off and power to the printer
• 7.5 Watts - Idle Mode (power on - not printing)
• 12 Watts - Printing (average)
• 25 Watts - Printing (peak)
General Information 1
4076-0XX
Options
• The following options are available.Some options are not avail-
able in every country. Contact your point of purchase for options
available in your country.
• Serial Adapter
• Flash Memory Simm - 256K, 1MB, 2MB
• SRAM SIMM - 256K
Maintenance Approach
The diagnostic information in this manual will lead you to the correct
field replaceable unit (FRU) or part. Use the error code charts,
symptom index, service checks, and diagnostic aids to determine
the symptom and repair the failure. Begin with “Start” on page 2-2.
This printer can be serviced without being connected to a host.
After you complete the repair, perform tests as needed to verify the
repair.
2
4076-0XX
Abbreviations
CE Customer Engineer
CPU Central Processing Unit
CSU Customer Setup
DRAM Dynamic Random Access Memory
EP Electrophotographic Process
ESD Electrostatic Discharge
FRU Field Replaceable Unit
HVPS High Voltage Power Supply
LASER Light Amplification by Stimulated Emission
of Radiation
LCD Liquid Crystal Display
LED Light-Emitting Diode
LVPS Low Voltage Power Supply
MAP Maintenance Analysis Procedures
NVRAM Nonvolatile Random Access Memory
OEM Original Equipment Manufacturer
PC Photoconductor
PCA Printed Circuit Assemblies
PICS Problem Isolation Charts
PIXEL Picture Element
POST Power-On Self Test
PQET Print Quality Enhancement Technology
PSO Printer Sharing Option
SRAM Static Random Access Memory
UPR Used Parts Replacement
V AC Volts alternating current
V DC Volts direct current
ZIF Zero Insertion Force
Unique Tools Required For Service
Wrap Plug (Parallel) P/N = 1319128
General Information 3
4076-0XX
Diagnostic Information 4
Use the error code charts, symptom index, service checks, and
diagnostic aids in this chapter to determine the failing part in a malfunctioning printer.
Start
Service error indications show up as flashing operator panel lights. A
flashing Draft light always indicates a service related error. If your
machine has an error indication, locate the pattern of alternating
flashing lights in the following table and take the indicated action.
If your machine does not have an error indicator, go to “Power-on-
self-test (Post) Sequence” on page 7. If an error indicator appears
while you are working on the machine, go to the error indicator table
and take the indicated action for that error.
The printer also logs the last occurring error. If you think you may
have an intermittent error, or the error indicator lights have been
cleared, you can retrieve the error from the Test Page printout:
1. Run the “Test Page” on page 26.
2. The error is the last number to print on the page in the lower right
corner. Note the number.
3. Run “Initialize Nvram” on page 28 to clear the log (the number
may not be the result of a current error).
4. Run Test Page again to verify a current error. If no error prints,
go to “Power-on-self-test (Post) Sequence” on page 7.
Diagnostic Information 4
4076-0XX
Error Indicator Table
Error
Code
64
65
66 to
78
No
Log
Alternating Light Pattern Action
Replace the EPROM and/or
system board.
Replace the EPROM and/or
system board.
Replace the EPROM and/or
system board.
79 Replace the EPROM and/or the
system board.
Diagnostic Information 5
4076-0XX
Error
Code
80 Go to the “Maintenance Station
81 Go to the “Transport Service
85 Go to the “Transport Service
Alternating Light Pattern Action
ServiceCheck”onpage12.
Check” on page 22.
Check” on page 22.
84 86
87 88
89 Go to the “Transport Service
Go to the “Simm Service Check”
on page 22.
Check” on page 22.
6
4076-0XX
Error
Code
90 Go to the “Transport Service
127
and
up
Alternating Light Pattern Action
Check” on page 22.
Go to the “Maintenance Station
Service Check” on page 12.
Power-on-self-test (Post) Sequence
When you turn the printer on it performs a POST. Turn your machine
on and check for a correct POST operation by observing the following:
1. The power light comes on.
2. All four function lights come on and then go off one light at a time
starting with the Busy light. The Draft light may take longer than
the others to go off.
3. The paper feed gears turn.
4. The carrier moves to the left and right at least one time.
5. The maintenance station cleans and caps the print head.
6. All motors stop and the power light stays on.
If your machine completes POST with no errors, go to the. “Symp-
tom Tables” on page 9, locate your symptom and take the indicated
action.
If your machine does not complete POST locate your symptom in
the following table and take the indicated action
Diagnostic Information 7
4076-0XX
POST Symptom Table.
Symptom Action
No lights come on and no motors run Go to the “Power Service
Check” on page 19.
The Powerlight is the only light that
comes on
One or more operator panel lights do
not come on
One or more operator panel lights do
not go off
Feeds paper Go to the “First Print Line Ser-
Paper feed gears do not turn Go to the “Paper Feed Service
Feeds paper and prints Go to the “ Note: if the failure
Carrier doesn’t move Go to the “Transport Service
Maintenance station doesn’t move Go to the “Maintenance Station
The printer prints “HARDWARE
ERROR HAVE PROTOCOL CONVERTER SERVICED”
The carrier moves then error 85
appears
Go to the “Operator Panel Ser-
vice Check” on page 13.
Go to the “Operator Panel Ser-
vice Check” on page 13.
Go to the “Operator Panel Ser-
vice Check” on page 13.
vice Check” on page 11.
Check” on page 14.
remains, replace the system
board” on page 12.
Check” on page 22.
ServiceCheck”onpage12.
Replace the serial adapter.
Replace the system board.
8
4076-0XX
Symptom Tables
Locate your symptom in the following tables and take the appropriate action.
Carrier Transport Problems
SYMPTOM ACTION
• No carrier movement
• Slow carrier movement
• Carrier stops
Go to the “Transport Service Check”
on page 22.
Communications Problem
SYMPTOM ACTION
Printer not communicating with
host.
Go to the “Parallel Port Service
Check” on page 18.
Maintenance Station Problems
SYMPTOM ACTION
• Maintenance station doesn’t
move
• Failsto cap fails to cap the print
head the print head
• Fails to clean the print head
Go to the “Maintenance Station Ser-
vice Check” on page 12.
Operator Panel Problems
SYMPTOM ACTION
• Panel light(s) not working
• Panel button(s) not working
• Power Lights the only light that
comes on
• Panel cover closed, open functions not working
Go to the “ Note: if the failure
remains, replace the system board”
on page 12.
Diagnostic Information 9
4076-0XX
Paper Feed Problems
SYMPTOM ACTION
Paper fails to stop at first print
line
• 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 “Envelope Feed Service
Paper skews Go to the “Paper Path Service
Go to the “First Print Line Service
Check” on page 11.
Go to the “Paper Feed Service
Check” on page 14.
Check” on page 11.
Check” on page 17.
Power Problems
SYMPTOM ACTION
No power in machine, no lights,
no motors
Go to the “Power Service Check” on
page 19.
Print Quality Problems
SYMPTOM ACTION
• Voids in characters
•Lightprint
• Prints off the page
• Prints satellites
• Carrier moves but does not print
• Print head drying out prematurely
• Vertical alignment off
• Ink smearing
• Vertical streaks on paper
• Print lines crowded
Go to the “Print Quality Service
Check” on page 20.
Go to the “Paper Feed Service
Check” on page 14.
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4076-0XX
SIMM Problem
SYMPTOM ACTION
Can’t write to SIMM Go to the “Simm Service Check” on
page 22.
Service Checks
Envelope Feed Service Check
FRU OR PROCEDURE ACTION
1 Envelope Loading Be sure the envelope guides have
been turned to the envelope load
positions
Besuretheenvelopeguidesare
against the envelopes
Go to and perform the “Paper Feed
Service Check” on page 14.
First Print Line Service Check
FRU OR PROCEDURE ACTION
1 End-of-Forms Flag Check the flag for binds or damage.
2 End-of-Forms Sensor Check the sensor for dirt.
3 System Board Perform the “Paper Sensor Test” on
page 26 to check the end-of-forms sen-
sor.
4 Feed Arm Assembly Check all parts of the feed arm assem-
bly for binds, wear, or damage.
5 Software Setting Use Toolkit, on the setup diskette, to
6 Operator Panel Go to the “ Note: if the failure remains,
adjust the Top of Form setting.
replace the system board” on page 12.
Diagnostic Information 11
4076-0XX
Maintenance Station Service Check
The maintenance station has two functions:
1. Cleans the print head nozzles during the print operation.
2. Seals the print head when it is not being used to prevent the nozzles from drying..
FRU OR PROCEDURE ACTION
1 Maintenance Drive Assem-
bly
2 System Board Turn the printer off and disconnect J4
3 Maintenance Rocker Am. Check for binds or wear.
4 Wiper A worn wiper will cause degraded print
Disconnect J4 from the system board.
Check for 18 ohms (±4 ohms) between
pins 1 and 2 at the motor. If the reading
is incorrect, replace the maintenance
drive assembly,
Check for motor pins shorted to the
motor housing. If you find a shorted pin,
replace the maintenance drive assembly. If the symptom remains, replace the
system board.
Abindinthedriveassemblycanprevent
the motor from turning. Check for binds
and loose or worn parts in the drive
assembly. Also check the motor gear
from the system board. Turn the printer
on and check for a pulse of 15 V dc
between J4-1 and ground on the system
board as the printer goes through
POST.
quality just after a maintenance cleaning. Check for loose or worn wiper.
5 Cap A worn cap will cause the print head
nozzles to dry and clog. Check for loose
or worn cap.
Note: if the failure remains, replace the system board
12
4076-0XX
Operator Panel Service Check
FRU OR PROCEDURE ACTION
1 Power Supply Disconnect J11 from the system
board and check the following voltages on the power supply cable:
J11-1 to GND = +5V dc
J11-3 to GND = +24V dc
If you do not have correct voltage,
replace the power supply. Be sure to
unplug the machine before you reconnect the power supply to the system
board.
2 System Board Turn the printer on. Check for +5 V dc
at test point CE/TP near the operator
panel connector on the system board
3 Operator Panel Cover The operator panel cover actuates
the operator panel sensor on the
operator panel. Check the cover for
any broken parts. Check the operator
panel sensor for dirt.
4 Operator Panel Card
Operator Panel Cable
Check the operator panel cable for
continuity. If the cable is good,
replace the operator panel. If the
symptom remains, replace the system board.
Diagnostic Information 13
4076-0XX
Paper Feed Service Check
If your machine does not have paper jam problems, go on to the service check. If your machine does have a paper jam problem, examine it for the following before you begin the service check.
• Check the entire paper path for obstructions.
• Make sure there is not too much paper in the ASF.
• Make sure the correct type of paper is in the machine.
• Check for static in the paper.
• Make sure the rear of the carrier guide is on top of the paper
guide.
FRU OR PROCEDURE ACTION
1 System Board With J5 disconnected and power on,
check for +24 V dc between J5-3 and
ground, and between J5-4 and
ground on the system board. If the
voltage is not present, check for
motor pins shorted to the motor housing. If you find a shorted pin, replace
the motor. If you still have a failure
after replacing the motor, replace the
system board.
14
4076-0XX
FRU OR PROCEDURE ACTION
2 Paper Feed Motor Anoisy or chattering motor 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
• Abind in the paper feed mechanism
Check for 100 ohms (±20 ohms)
between the following pins on the
motor:
Pin 1 to Pin 4
Pin 2 to Pin 4
Pin 3 to Pin 5
Pin 3 to Pin 6
If the readings are incorrect, replace
the motor. Check for motor pins
shorted to the motor housing. If you
find a shorted pin, replace the motor.
If the failure remains, replace the system board.
Although the paper feeds in a forward
direction only, the paper feed motor
turns in two directions. If the paper
feed motor turns in one direction only,
replace the system board. Binds in
thepaperfeedmotororgeartraincan
cause intermittent false paper jam
errors. Remove the paper feed motor
and check the shaft for binds Also
check for loose or worn motor gear
3 Gears Check for binds in the gear train and
paper feed mechanism. To do this,
rotate the largest gear by hand. If you
noticeabindisolateitbyremoving
thesmallidlergearontheoutsideof
the right side plate. Replace any worn
or binding gears, rollers, or bearings.
Diagnostic Information 15
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