Lexmark Medley 4012-009 User manual

4012-0XX
Medley
TM
Lexmark and Medley are trademarks
of Lexmark International, Inc.,
registered in the United States and/or
other countries.
• Table of Contents
•Index
• Safety and Notices
• Trademarks
• Start Diagnostics
• Main Menu

Second Edition (July, 1995)
The following paragraph does not apply to the United Kingdom or any country
where such provisions are inconsistent with local law: LEXMARK INTERNA-
TIONAL, INC. PROVIDES THIS PUBLICATION “AS IS” WITHOUT WAR-
RANTY 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 dis-
claimer 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 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 pub-
lications 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. Lex-
mark may use or distribute any of the information you supply in any way it
believes appropriate without incurring any obligation to you.
Lexmark and Medley are trademarks of Lexmark International, Inc.
ExecJet is a registered trademark of International Business Machines Corpora-
tion
© Copyright Lexmark International, Inc. 1995. All Rights Reserved.
UNITED STATES GOVERNMENT RESTRICTED RIGHTS
This software and documentation are provided with RESTRICTED RIGHTS.
Use, duplication or disclosure by the Government is subject to restrictions as
set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer
Software clause at DFARS 252.227-7013 and in applicable FAR provisions:
Lexmark International, Inc., Lexington, KY 40550.
4012-0XX

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4012-0XX
Contents 1
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Safety Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Maintenance Approach. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Diagnostic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Symptom Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Service Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Communications Service Check . . . . . . . . . . . . . . . . . . . . . 7
Envelope Feed Service Check. . . . . . . . . . . . . . . . . . . . . . . 8
First Print Line Service Check . . . . . . . . . . . . . . . . . . . . . . . 8
Maintenance Station Service Check . . . . . . . . . . . . . . . . . . 9
Operator Panel Service Check. . . . . . . . . . . . . . . . . . . . . . 10
Power Service Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Printer Paper Feed Service Check. . . . . . . . . . . . . . . . . . . 12
Printer Paper Path Service Check . . . . . . . . . . . . . . . . . . . 15
Print Quality Service Check . . . . . . . . . . . . . . . . . . . . . . . . 16
Printing Problem Service Check. . . . . . . . . . . . . . . . . . . . . 18
Scanner Document Feed Service Check. . . . . . . . . . . . . . 19
Scanner Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Transport Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Diagnostic Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Call Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Error Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Frame Service Position. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Hex Print Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Machine Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Memory Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Operator Panel Service Position. . . . . . . . . . . . . . . . . . . . . . . . 23
Operator Panel Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Reset Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Print Engine Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Purge Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Scanner Feed Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Setting the Machine Serial Number . . . . . . . . . . . . . . . . . . . . . 26
Test Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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4012-0XX
Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Handling ESD-Sensitive Parts . . . . . . . . . . . . . . . . . . . . . . . . . 28
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Bidirectional Alignment Adjustment. . . . . . . . . . . . . . . . . . 29
Removal Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Auto Sheet Feed (ASF) Assembly Removal . . . . . . . . . . . 30
ASF Envelope Buckler and Pick Roller Hub Removal. . . . 31
ASF Right and Left Edge Guide Assemblies Removal . . . 31
Battery Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Carrier Guide Rod Removal . . . . . . . . . . . . . . . . . . . . . . . 31
Carrier Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Carrier Transport Belt Removal. . . . . . . . . . . . . . . . . . . . . 32
Carrier Transport Motor Removal . . . . . . . . . . . . . . . . . . . 33
Carrier Transport Motor Frame Removal . . . . . . . . . . . . . 33
Covers Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Front Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Rear Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Right Side Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Left Side Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Operator Panel and Cover . . . . . . . . . . . . . . . . . . . . . .34
Encoder Strip Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
End-of-Forms Flag Removal . . . . . . . . . . . . . . . . . . . . . . . 35
Exit Roller Assembly Removal . . . . . . . . . . . . . . . . . . . . . 35
EPROM Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Fax Board, Printer Board, and LCU Board Removal. . . . . 37
Feed Arm Assembly Removal. . . . . . . . . . . . . . . . . . . . . . 37
Inside Idler Gears Removal. . . . . . . . . . . . . . . . . . . . . . . . 37
Large Feed Roller Assembly Removal . . . . . . . . . . . . . . . 38
Left Side Frame Removal . . . . . . . . . . . . . . . . . . . . . . . . . 38
Maintenance Drive and Rocker Assemblies Removal. . . . 39
Memory Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Middle Frame Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Outside Idler Gears Removal . . . . . . . . . . . . . . . . . . . . . . 40
Paper Ejectors Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Paper Feed Motor Removal . . . . . . . . . . . . . . . . . . . . . . . 40
Paper Guide Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Paper Release Lever Removal . . . . . . . . . . . . . . . . . . . . . 41
Power Supply Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Print Engine Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Printhead Cable Removal . . . . . . . . . . . . . . . . . . . . . . . . . 43
Releasing Plastic Latches . . . . . . . . . . . . . . . . . . . . . . . . . 44
Right Side Frame Removal . . . . . . . . . . . . . . . . . . . . . . . . 45

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Repair Information, Removal Procedures (continued)
Rubber Backer Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Small Feed Roller Assembly Removal. . . . . . . . . . . . . . . . 47
Star Roller Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Scanner and Speaker Removal . . . . . . . . . . . . . . . . . . . . . 48
Subframe Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Parts and Test Point Locations . . . . . . . . . . . . . . . . . . . . . . . . . . 49
LCU Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Fax Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Printer Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Lubrication Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . 54
Scanner Cleaning Procedure. . . . . . . . . . . . . . . . . . . . . . . 55
Parts Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
How To Use This Parts Catalog. . . . . . . . . . . . . . . . . . . . . 56
Assembly 1: Covers . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Assembly 2: Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Assembly 3: Operator Panel . . . . . . . . . . . . . . . . . . . . 61
Assembly 4: Printer Paper Feed Assembly . . . . . . . . 63
Assembly 4: Printer Paper Feed Assembly (cont.) . . . 65
Assembly 5: Carrier . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Assembly 6: Carrier Transport . . . . . . . . . . . . . . . . . . 69
Assembly 7: Maintenance Station . . . . . . . . . . . . . . . 71
Assembly 8: Scanner . . . . . . . . . . . . . . . . . . . . . . . . . 73
Assembly 9: Electronics . . . . . . . . . . . . . . . . . . . . . . . 75
Assembly 10: Automatic Sheet Feed (ASF) . . . . . . . . 77
Assembly 11: Options . . . . . . . . . . . . . . . . . . . . . . . . . 79
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

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Preface
This manual 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 the symptom table and ser-
vice 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. Parts and Test Point Locations uses illustrations to identify the
major components and test points on the printer.
6. Preventive Maintenance contains recommendations to help
prevent problems and maintain optimum performance.
7. Parts Catalog contains illustrations and part numbers for indi-
vidual FRUs.

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4012-0XX
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
injury during disassembly and servicing of this product. Profes-
sional service personnel should understand this and take neces-
sary precautions.
•The safety features of some parts may not always be obvious.
Therefore, replacement parts must have the identical or equiva-
lent characteristics as the original parts.
Sicherheitshinweise
•Die Wartungsinformationen fuer dieses Produkt wurden zur
Verwendung durch einen Wartungsfachmann entwickelt und
sollten nicht von anderen benuetzt werden.
•Zusaetzliches Risiko eines elektrischen Schlags und
koerperlicher Verletzung existiert waehrend des
Auseinandernehmens und der Wartung des Geraets.
Fachpersonal sollte im vollen Verstaendnis der Lage
entsprechende VorsichtsmaBnahmen ergreifen.
•Ersatzteile muessen gleiche oder gleichwertige Merkmale wie
die Originalteile aufweisen, da Sicherheitsvorkehrungen nicht
immer offensichtlich sind.
Consignes De Securite
•Les consignes d’entretien et de reparation de ce produit
s’adressent uniquement a un personnel de maintenance qualifie.
•Le demontage et l’entretien de ce produit pouvant presenter
certains risques electriques, le personnel d’entretien qualifie
devra prendre toutes les precautions necessaires.
•Les normes de securite de certaines pieces n’etant pas toujours
explicites, les pieces de rechange doivent etre identiques ou
conformes aux caracteristiques des pieces d’origine.

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4012-0XX
Norme Di Sicurezza
•Le informazioni riguardanti la manutenzione di questo prodotto
sono indirizzate soltanto al personale dell’assistenza autorizzato.
•Durante lo smontaggio e il manutenzionamento di questo
prodotto, e possibile il rischio accresciuto di scosse elettriche e
danni personali. Il personale di assistenza autorizzato,
consapevole di cio, deve adottare le precauzioni necessarie.
•E possibile che le funzioni di sicurezza di alcuni elementi non
siano cosi ovvie, quindi, i pezzi di ricambio devono avere
caratteristiche identiche o equivalenti a quelle dei pezzi originali.
Pautas De Seguridad
•La informacion sobre el mantenimiento de este producto fue
escrita para el personal de mantenimiento cualificado y no para
cualquier otro usuario.
•Existen mayores riesgos de descargas electricas y danos
personales durante el desmontaje y la reparacion de la maquina.
El personal cualificado comprende esto y toma las precauciones
necesarias.
•Los dispositivos de seguridad de algunas partes quiza no
siempre puedan ser reconocidas a simple vista. Por lo tanto, las
partes de reemplazo deben poseer caracteristicas identicas o
equivalentes a las partes originales.
Sikkerhedsoplysninger
•Oplysningerne om vedligeholdelse af dette produkt er forberedt
med henblik pa professionelt servicepersonale, og bor derfor ikke
benyttes af andre.
•Risikoen for elektrisk stod oges under demontering og service af
dette produkt, hvorfor der bor tages de nodvendige
forholdsregler.
•Sikkerhedsforanstaltningerne er ikke altid lige apenbare for alle
reservedele. Der bor derfor kun anvendes originale reservedele
eller reservedele med samme egenskaber som de oprindelige.

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4012-0XX
Chinese Safety Information
Korean Safety Information

General Information 1
4012-0XX
General Information 8
This manual is used to service the Lexmark Medley 4012. Medley is
a multifunction product which can connect to an IBM-compatible per-
sonal computer. It acts as an all-in-one color-capable printer, G3 fax
machine, scanner, and convenience copier. It will send and receive
faxes, scan documents, print from the PC, and make convenience
copies. It uses 300 x 300 pels per inch inkjet technology for high
quality text and graphics. Print Quality Enhancement Technology
(PQET) smooths the edges of lines and characters.
Medley uses the same black or color print cartridges as the IBM
ExecJet II and ExecJet IIc by Lexmark.
Medley uses a 300 x 300 dpi scanner for fast, high quality scanning,
personal copying, and faxing. Scanning software for the PC is
included with the Medley.
There are three models: Medley 4c (4012-005) which does not
include a handset, Medley 4x (4012-006) which does include a
handset, and the Medley 4sx (4012-009) which is the same as the
4x but is shipped standard with the battery backup. Other than in the
Parts Catalog, there are no service differences.
All models can handle a variety of paper sizes as well as envelopes
and other media using an integrated automatic sheet feed and man-
ual feed.
The machine contains the following circuit boards:
•Fax Board—controls the scanner and most of the machine’s
functions
•Printer Board—runs the printer motors, sensors, and printhead
•Line Connect Unit (LCU) Board—printer parallel port and tele-
phone connections
•Operator Panel Board

General Information 2
4012-0XX
Options
The following options are available. Contact your point of purchase
for options available in your country.
•1MB Memory Expansion
•3MB Memory Expansion
•Battery Backup (standard on Medley 4sx)
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 table, service checks, and diagnostic aids to determine the
symptom and repair the failure.
Medley can be serviced without being connected to a host computer.
After you complete the repair, perform tests as needed to verify the
repair.

4012-0XX
3
Abbreviations
CCD Charge Coupled Device
CE Customer Engineer
CSU Customer Setup
DRAM Dynamic Random Access Memory
ESD Electrostatic Discharge
FRU Field Replaceable Unit
G3 Group 3 (Digital Facsimile Protocol)
LCD Liquid Crystal Display
LCU Line Connect Unit
LED Light-Emitting Diode
NVRAM Nonvolatile Random Access Memory
OEM Original Equipment Manufacturer
PCA Printed Circuit Assemblies
PICS Problem Isolation Charts
PIXEL Picture Element
POST Power-On Self Test
PQET Print Quality Enhancement Technology
SRAM Static Random Access Memory
UPR Used Parts Replacement
V ac Volts alternating current
V dc Volts direct current
ZIF Zero Insertion Force

Diagnostic Information 4
4012-0XX
Diagnostic Information 9
Use the symptom table and service checks in this chapter to deter-
mine the failing part in a malfunctioning machine.

4012-0XX
5
Symptom Table
Symptom Action
Printer Code 1,4 Replace the printer board EPROM;
if necessary replace the printer board.
Printer Code 1,6 Go to “Transport Service Check” on page
21.
Printer Code 1,8 Replace the printer board EPROM;
if necessary replace the printer board.
Printer Code 1,10 Go to “Maintenance Station Service
Check” on page 9.
Printer Code 1,12 Replace the printer board EPROM;
if necessary replace the printer board.
Printer Code 1,14 Go to “Maintenance Station Service
Check” on page 9.
Printer Code 3,4 Go to “Transport Service Check” on page
21.
Printer Code 3,8 Go to “Transport Service Check” on page
21.
Printer Code 9,2 Replace the printer board EPROM;
if necessary replace the printer board.
Printer Code 9,4 Go to “Transport Service Check” on page
21.
Power Problem
No LEDs or LCD pixels light up
during POR, no machine activ-
ity: Go to “Power Service Check” on page 11.
Maintenance Station Problem
Maintenance station does not
move, or fails to clean or cap the
printhead: Go to “Maintenance Station Service Check” on page 9.
Carrier Transport Problem
No carrier movement, slow car-
rier movement, carrier stops: Go to “Transport Service Check” on page 21.
Operator Panel Problem
Incorrect or no lit LEDs or LCD
display, or buttons do not work
properly: Go to “Operator Panel Service Check” on page 10.

Diagnostic Information 6
4012-0XX
Printer paper feed, misfeed, or
jam problem
Paper fails to stop at first print
line:
Envelopes fail to feed:
Paper misfeeds, multifeeds,
jams, picks but fails to feed, or
fails to exit:
Paper skews:
Go to “First Print Line Service Check” on
page 8.
Go to “Envelope Feed Service Check” on
page 8.
Go to “Printer Paper Feed Service Check”
on page 12.
Go to “Printer Paper Path Service Check”
on page 15.
Scanner paper feed, misfeed, or
jam problem Go to “Scanner Document Feed Service Check” on page 19.
Printing Problem
Test prints, faxes, or printer jobs
do not print correctly (not a print
quality problem). Go to “Printing Problem Service Check” on page 18.
Print Quality Problem
Test prints, faxes, and printer
jobs print but output has voids or
uneven density or is fuzzy,
smudged, or faint. Go to “Print Quality Service Check” on page 16.
Scanning Problem
No scanned image or incorrect
scanned image: Go to “Scanner Service Check” on page 20.
Communications Problem
Cannot send fax, cannot receive
fax, or cannot connect with
remote machine: Go to “Communications Service Check” on page 7.
Symptom Action

4012-0XX
7
Service Checks
Communications Service Check
FRU Action
1 Fax or LCU Card
Cannot make telephone con-
nection to other fax machine.
No dialtone
Verify correct dialing method (tone or
pulse).
TEL and LINE connections reversed.
Verify phone number and availability of
other fax machine.
Turn Call Monitoring on and listen to the
speaker during dial. You should hear the
ring and a 0.5 second 1000Hz calling tone
from your machine, a 1 second pause,
then the 3 second 2100Hz fax response
tone and a 1650Hz-1850Hz “warbling”
handshaking tone from the called
machine.
Check the connections of LCU card J2 to
fax card J11. If the problem still exists,
replace the LCU board, and then if neces-
sary, the fax board.
2 Cannot receive faxes. Machine not set for auto-answer.
TEL and LINE connections reversed.
A telephone on the same line is already
off-hook.
Machine connected to the wrong tele-
phone line.
Damaged telephone line to machine.
Check memory; faxes received during
paper jams are stored and printed after
jam is cleared.
Make sure “Receive into memory” is set to
No.
If handshaking between fax machines can
be established, the LCU board should be
OK. If necessary, replace the fax board.

Diagnostic Information 8
4012-0XX
Envelope Feed Service Check
First Print Line Service Check
FRU Action
1 Envelope Loading Be sure the envelope guides have been
turned to the envelope load positions.
Be sure the envelope guides are against
the envelopes.
Go to and perform the “Printer Paper Feed
Service Check” on page 12.
FRU Action
1 Printer End-of-Forms Flag Check the flag for binds or damage.
2 Printer End-of-Forms Sensor Check the sensor for dirt.
3 Printer Board Check the End-of-Forms sensor, measure
the voltage at pin 2 of U28 on the printer
board. The voltage should change from 0 to
5 V dc as you block and unblock the End-of-
Forms sensor S1.
4 Feed Arm Assembly Check all parts of the feed arm assembly for
binds, wear, or damage.
5 Software Setting Use Toolkit, one of the setup programs
installed on the PC, to adjust the Top of Form
setting.
6 Operator Panel Go to “Operator Panel Service Check” on
page 10.

4012-0XX
9
Maintenance Station Service Check
The maintenance station has two functions:
1. Cleans the printhead nozzles during the print operation.
2. Seals the printhead when it is not being used to prevent the noz-
zles from drying.
Note: If the failure remains, replace the printer board.
FRU Action
1 Maintenance Drive Assembly Warning: Disconnecting the maintenance
motor while the machine is plugged in can
damage the printer board. Voltage is present
on the board even with the power switch off.
Disconnect J4 from the printer 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 printer board.
A bind in the drive assembly can prevent the
motor from turning. Check for binds and
loose or worn parts in the drive assembly.
Also check the motor gear.
2 Printer Board Turn the machine off and disconnect J4 from
the printer board. Turn the machine 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.
3 Maintenance Rocker Asm Check for binds or wear.
4 Wiper A worn wiper causes degraded print quality
just after a maintenance cleaning. Check for
loose or worn wiper.
5 Cap A worn cap causes the printhead nozzles to
dry and clog. Check for loose or worn cap.

Diagnostic Information 10
4012-0XX
Operator Panel Service Check
FRU Action
1 Power Supply Disconnect J2 from the fax board and
check the following voltages on the power
supply cable:
J2-1 to GND = +5 V dc
J2-3 to GND = +34 V 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 fax board.
2 Operator Panel Board
Operator Panel Cable Perform the Operator Panel Test; see “Operator Panel Test” on page 24.
If some of the buttons do not work, check
the contacts on the back of the keypads
and the surface of the lands on the opera-
tor panel board. Replace the keypads as
necessary. Check the continuity of the
operator panel cable before replacing the
operator panel board.
3 Fax Board Turn the printer on. Check for +5 V dc at
J4-3 on the fax board.

4012-0XX
11
Power Service Check
The operator panel power key does not control line power. With the
machine turned off the power supply is still active and there is volt-
age to both the fax and printer boards. To remove power you must
unplug the machine.
FRU Action
1 Power Supply Disconnect J2 from the fax board, J11
from the printer board and check the fol-
lowing voltages on both power supply
cables:
Pin-1 to GND = +5 V dc
Pin-3 to GND = +34 V 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 boards.
2 Printhead Cable
Parallel Cable Unplug the machine. Disconnect one of the listed components and plug in the
machine. Look for a symptom change.
Check the failing part for shorts and
replace as necessary. Repeat this proce-
dure for the remaining listed parts.
3 Printer Board Disconnect the fax board from the printer
board. Run the Print Engine Test. If the
test does not run and there are no
mechanical problems, replace the printer
board.
4 Fax Board Check for +5 V dc at the fax board J9-4,
and check for +34 V dc at J9-2. If the volt-
ages are incorrect replace the fax board.