Lexmark OptraTM User Manual

Download

• Table of Contents

• Start Diagnostics

• Safety and Notices

• Trademarks

Optra™ E

4026-0XX

• Index

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

4026-0XX

Third Edition (April 1997)

The following paragraph does not apply to the United Kingdom or any country where such provisions are inconsistent with local law: LEXMARK INTERNATIONAL, INC. PROVIDES THIS PUBLICATION “AS IS” WITHOUT WARRANTYOFANYKIND,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 toyou.

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., D22A/035-3, 740 New Circle Road NW,Lexington, Kentucky40550, 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.

Lexmark and Optra 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. 1995, 1997

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 theRights in Technical Data and Computer Software clause at DFARS 252.227-7013 and in applicable FAR provisions: Lexmark International, Inc., Lexington, KY 40550.

4026-0XX

Contents 1

NoticesandSafetyInformation ..........................vi

LaserNotice....................................... vi

SafetyInformation.................................. xvi

OzoneInformation................................. xix

Preface .............................................xx

GeneralInformation...................................1-1

Options.......................................... 1-1

Maintenance Approach.............................. 1-1

Tools Required For Service .......................... 1-1

Acronyms........................................ 1-2

DiagnosticInformation ................................2-1

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

ServiceErrorCodes............................. 2-2

UserErrorMessageTable........................ 2-6

UserSecondaryErrorMessageTable............... 2-8

Power-OnSelfTest(POST)...................... 2-10

POSTSymptomTable.......................... 2-12

SymptomTable............................... 2-13

ServiceChecks................................... 2-15

ChargeBrushServiceCheck..................... 2-15

CoverInterlockServiceCheck.................... 2-16

D-RollAssemblyServiceCheck................... 2-16

ExitSensorServiceCheck....................... 2-17

FanServiceCheck............................. 2-17

ColdFuserServiceCheck....................... 2-18

HotFuserServiceCheck........................ 2-20

Input Sensor Service Check...................... 2-20

Low Voltage Power Supply Service Check . . . ....... 2-22

MainDriveMotorServiceCheck.................. 2-25

Operator Panel Service Check.................... 2-27

Optional Paper Tray Two Service Check............ 2-28

Paper Take-Up Solenoid Service Check ............ 2-32

ParallelPortServiceCheck...................... 2-34

Paper Feed Service Check ...................... 2-34

Paper Feed Frame Assembly Service Check . ....... 2-37

PrintQualityServiceCheck...................... 2-38

RegistrationServiceCheck...................... 2-44

TransferAssemblyServiceCheck................. 2-44

TransferCoronaServiceCheck................... 2-45

ROMSIMMServiceCheck ...................... 2-45

iii

DiagnosticAids ......................................3-1

Power-OnSelfTest(Post)........................... 3-1

Diagnostic Tests . ................................. 3-3

Printer Diagnostic Test . . ........................ 3-3

Service Diagnostic Test Page ..................... 3-4

UserModePrintTestPage....................... 3-6

Paper Feed Timing ............................. 3-8

FuserOperation................................ 3-9

ConfigurationMode............................ 3-10

Configuration Mode Operator Panel Overlay . . . ..... 3-10

Operator Panel Configuration Mode Button Definition . 3-11

HexTrace................................... 3-12

RestoringFactoryDefaults...................... 3-13

RepairInformation....................................4-1

Handling ESD-Sensitive Parts........................ 4-1

Adjustment Procedures ............................. 4-2

PrintRegistrationAdjustment..................... 4-2

RemovalProcedures............................... 4-3

Screw Identification Table........................ 4-3

BoardCageRemoval........................... 4-4

CoverRemovals............................... 4-4

ControllerBoardRemoval........................ 4-5

D-RollRemoval................................ 4-6

EngineBoardRemoval.......................... 4-6

ExitSensorRemoval............................ 4-6

ExitSensorFlagRemoval........................ 4-6

Exit Paper Feed Roller Assembly Removal........... 4-7

FanRemoval.................................. 4-7

FuserLampRemoval........................... 4-7

FuserLowerFrameAssemblyRemoval............. 4-8

Fuser Upper Frame Assembly Removal ............. 4-8

Fuser Paper Separator Removal................... 4-8

HVPSBoardRemoval........................... 4-9

HVPSCoverRemoval........................... 4-9

LeftSidePlateRemoval......................... 4-9

LVPSRemoval............................... 4-10

MainDriveMotorRemoval...................... 4-10

MainDrive/PaperFeedGearsRemoval............ 4-10

Manual Paper Feed Guide Plate Removal .......... 4-10

Operator Panel Removal. ....................... 4-11

Paper Entry Sensor Removal .................... 4-11

Paper Entry Sensor Flag Removal . . .............. 4-11

Paper Feed Frame Assembly Removal............. 4-12

4026-0XX

Removal Procedures (continued)

Paper Feed Solenoid Removal . . . ................ 4-12

Paper Feed Input Tray Assembly Removal . . . ....... 4-12

Paper Lift Plate Assembly Removal................ 4-12

Paper Separator Removal ....................... 4-13

Printhead Removal............................. 4-13

Print Media Selection Lever Removal (06C/06F/071) . . 4-13

Second Paper Tray Option Connector Removal ...... 4-13

Thermal Fuse Removal (06A/06B/06D/06J/070) ...... 4-14

ThermostatRemoval(06C/06F/071)............... 4-14

ThermistorRemoval............................ 4-14

TransferUnitRemoval.......................... 4-14

ConnectorLocations ..................................5-1

Low Voltage Power Supply ....................... 5-1

High Voltage Power Supply ....................... 5-2

EngineBoard.................................. 5-3

SecondPaperTraySensorBoard(Option)........... 5-7

ControllerBoard................................ 5-7

Paper Exit Sensor ............................. 5-11

Paper Entry Sensor . . . ......................... 5-11

Paper Feed Solenoid . . ......................... 5-11

PartsCatalog ........................................6-1

HowToUseThisPartsCatalog....................... 6-1

Assembly1:Covers............................. 6-2

Assembly2:Frame ............................. 6-6

Assembly 3: Printhead. ......................... 6-12

Assembly 4: Paper Feed Input Tray................ 6-14

Assembly 5: Paper Feed Frame. . . ................ 6-16

Assembly6:Fuser............................. 6-18

Assembly7:Electronics......................... 6-22

Assembly8:TransferAssembly................... 6-26

Assembly 9: Option - Second Paper Drawer . . ....... 6-28

Assembly10:Options .......................... 6-34

Assembly 11: Miscellaneous ..................... 6-35

Index .............................................. X-1

4026-0XX

Notices and Safety Information

Laser Notice

The printer is certified in the U.S. to conform to the requirements of DHHS 21 CFR Subchapter J for Class I (1) laser products, and elsewhere is certified as a Class I laser product conforming to the requirements of IEC 825.

Class I laser products are not considered to be hazardous. The printer contains internally a Class IIIb (3b) laser that is nominally a 5 milliwatt gallium arsenidelaser operating in the wavelengthregion of 770-795 nanometers. The laser system and printer are designed so there is never any human access to laser radiation above a Class I level during normal operation, user maintenance, or prescribed service condition.

vi Service Manual

4026-0XX

Laser product labels are located on the back of the printer and on the printhead.

CLASS 1 LASER PRODUCT LASER KLASSE1 NACH IEC825 LUOKAN 1 LASERLAITE APPAREIL A LASER DE CLASSE1 TO IEC 825

Notices and Safety Information vii

4026-0XX

viii Service Manual

4026-0XX

Laser

Der Drucker erfüllt gemäß amtlicher Bestätigung der USA die Anforderungen der Bestimmung DHHS (Department of Health and Human Services) 21 CFR Teil J für Laserprodukte der Klasse I (1). In anderen Ländern gilt der Drucker als Laserprodukt der Klasse I, der die Anforderungen der IEC (International Electrotechnical Commission) 825 gemäß amtlicher Bestätigung erfüllt.

Laserprodukte der Klasse I gelten als unschädlich. Im Inneren des Druckers befindet sich ein Laser der Klasse IIIb (3b), bei dem es sich um einen Galliumarsenlaser mit 5 Milliwatt handelt, der Wellen der Länge 770-795 Nanometer ausstrahlt. Das Lasersystem und der Drucker sind so konzipiert, daß im Normalbetrieb, bei der Wartung durch den Benutzer oder bei ordnungsgemäßer Wartung durch den KundendienstLaserbestrahlung, die die Klasse I übersteigen würde, Menschen keinesfalls erreicht.

Avis relatif à l’utilisation de laser

Pour les Etats-Unis : cette imprimante est certifiée conforme aux provisions DHHS 21 CFR alinéa J concernant les produits laser de Classe I (1). Pour les autres pays : cette imprimante répond aux normes IEC 825 relatives aux produits laser de Classe I.

Les produits laser de Classe I sont considérés comme des produits non dangereux. Cette imprimante est équipée d’un laser de Classe IIIb (3b) (arséniure de gallium d’une puissance nominale de 5 milliwatts) émettant sur des longueurs d’onde comprises entre 770 et 795 nanomètres. L’imprimante et son système laser sont conçus pour impossible, dans des conditions normales d’utilisation, d’entretien par l’utilisateur ou de révision, l’exposition à des rayonnements laser supérieurs à des rayonnements de Classe I .

Notices and Safety Information ix

4026-0XX

Avvertenze sui prodotti laser

Questa stampante è certificata negli S tati Uniti per essereconforme ai requisiti del DHHS 21 CFR Sottocapitolo J per i prodotti laser di classe 1 ed è certificata negli altri Paesi come prodotto laser di classe 1 conforme ai requisiti della norma CEI 825.

I prodotti laser di classe non sono considerati pericolosi. La stampante contiene al suo interno un laser di classe IIIb (3b) all’arseniuro di gallio della potenza di 5mW che opera sulla lunghezza d’onda compresa tra 770 e 795 nanometri. Il sistema laser e la stampante sono stati progettati in modo tale che le persone a contatto con la stampante, durante il normale funzionamento, le operazioni di servizio o quelle di assistenza tecnica, non ricevano radiazioni laser superiori al livello della classe

1..

Avisos sobre el láser

Se certifica que, en los EE.UU., esta impresora cumple los requisitos para los productos láser de Clase I (1) establecidos en el subcapítulo J de la norma CFR 21 del DHHS (Departamento de Sanidad y Servicios) y, en los demás países, reúne todas las condiciones expuestas en la norma IEC 825 para productos láser de Clase I (1).

Los productos láser de Clase I no se consideran peligrosos. La impresora contiene en su interior un láser de Clase IIIb (3b) de arseniuro de galio de funcionamiento nominal a 5 milivatios en una longitud de onda de 770 a 795 nanómetros. El sistema láser y la impresora están diseñados de forma que ninguna persona pueda verse afectada por ningún tipo de radiación láser superior al nivel de la Clase I durante su uso normal, el mantenimiento realizado por el usuario o cualquier otra situación de servicio técnico.

x Service Manual

4026-0XX

Declaração sobre Laser

A impressora está certificada nos E.U.A. em conformidade com os requisitos da regulamentação DHHS 21 CFR Subcapítulo J para a Classe I (1) de produtos laser. Em outros locais, está certificada como um produto laser da Classe I, em conformidade com os requisitos da norma IEC 825.

Os produtos laser da Classe I não são considerados perigosos. Internamente, a impressora contémum produto laser da ClasseIIIb (3b), designado laser de arseneto de potássio, de 5 milliwatts ,operando numa faixa de comprimento de onda entre 770 e 795 nanómetros. O sistemaeaimpressoralaserforamconcebidosde forma a nunca existir qualquer possiblidade de acesso humano a radiação laser superior a um nível de Classe I durante a operação normal, a manutenção feita pelo utilizador ou condições de assistência prescritas.

Laserinformatie

De printer voldoet aan de eisen die gesteld worden aan een laserprodukt van klasse I. Voor de Verenigde Staten zijn deze eisen vastgelegd in DHHS 21 CFR Subchapter J, voor andere landen in IEC 825.

Laserprodukten van klasse I worden niet als ongevaarlijk aangemerkt. De printer is voorzien van een laser van klasse IIIb (3b), dat wil zeggen een gallium arsenide-laser van 5 milliwatt met een golflengte van 770-795 nanometer. Het lasergedeelte en de printer zijn zo ontworpen dat bij normaal gebruik, bij onderhoud of reparatie conform de voorschriften, nooit blootstelling mogelijk is aan laserstraling boven een niveau zoals voorgeschreven is voor klasse 1.

Notices and Safety Information xi

4026-0XX

Lasermeddelelse

Printeren er godkendt som et Klasse I-laserprodukt, i overenstemmelse med kravene i IEC 825.

Klasse I-laserprodukter betragtes ikke som farlige. Printeren indeholder internt en Klasse IIIB (3b)-laser, der nominelt er en 5 milliwatt galliumarsenid laser,som arbejder på bølgelængdeområdet 770-795 nanometer. Lasersystemet og printeren er udformet således, at mennesker aldrig udsættes for en laserstråling over Klasse I-niveau ved normal drift, brugervedligeholdelse eller obligatoriske servicebetingelser.

Huomautus laserlaitteesta

Tämä kirjoitin on Yhdysvalloissa luokan I (1) laserlaitteiden DHHS 21 CFR Subchapter J -määrityksen mukainen ja muualla luokan I laserlaitteiden IEC 825 -määrityksen mukainen.

Luokan I laserlaitteiden ei katsota olevan vaarallisia käyttäjälle. Kirjoittimessa on sisäinen luokan IIIb (3b) 5 milliwatin galliumarsenidilaser, joka toimii aaltoalueella 770 - 795 nanometriä. Laserjärjestelmä ja kirjoitin on suunniteltu siten, että käyttäjä ei altistu luokan I määrityksiä voimakkaammalle säteilylle kirjoittimen normaalin toiminnan, käyttäjän tekemien huoltotoimien tai muiden huoltotoimien yhteydessä.

VARO! Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen.

VARNING! Osynlig laserstrålning när denna del är öppnad och spärren är urkopplad. Betrakta ej strålen.

xii Service Manual

4026-0XX

Laser-notis

Denna skrivare är i USA certifierad att motsvara kraven i DHHS 21 CFR, underparagraf J för laserprodukter av Klass I (1). I andra länder uppfyller skrivaren kraven för laserprodukter av Klass I enligt kraven i IEC 825.

Laserprodukter i Klass I anses ej hälsovådliga. Skrivaren har en inbyggd laser av Klass IIIb (3b) som består av en laserenhet av gallium-arsenid på 5 milliwatt som arbetar i våglängdsområdet 770795 nanometer. Lasersystemet och skrivaren är utformade så att det aldrig finns risk för att någon person utsätts för laserstrålning över Klass I-nivå vid normal användning, underhåll som utförs av användaren eller annan föreskriven serviceåtgärd.

Laser-melding

Skriveren er godkjent i USA etter kravene i DHHS 21 CFR, underkapittel J, for klasse I (1) laserprodukter, og er i andre land godkjent som et Klasse I-laserprodukt i samsvar med kravene i IEC

825. Klasse I-laserprodukter er ikke å betrakte som farlige. Skriveren

inneholder internt en klasse IIIb (3b)-laser, som består av en gallium-arsenlaserenhet som avgir stråling i bølgelengdeområdet 770-795 nanometer. Lasersystemet og skriveren er utformet slik at personer aldri utsettes for laserstråling ut over klasse I-nivå under vanlig bruk, vedlikehold som utføres av brukeren, eller foreskrevne serviceoperasjoner.

Notices and Safety Information xiii

4026-0XX

Avís sobre el Làser

Segons ha estat certificat als Estats Units, aquesta impressora compleix els requisits de DHHS 21 CFR, apartat J, pels productes làser de classe I (1), i segons ha estat certificat en altres llocs, és un producte làser de classe I que compleix els requisits d’IEC 825.

Els productes làser de classe I no es consideren perillosos. Aquesta impressora conté un làser de classe IIIb (3b) d’arseniür de gal.li, nominalment de 5 mil.liwats, i funciona a la regió de longitud d’ona de 770-795 nanòmetres. El sistema làser i la impressora han sigut concebuts de manera que mai hi hagi exposició a la radiació làser per sobre d’un nivell de classe I durant una operació normal, durant les tasques de manteniment d’usuari ni durant els serveis que satisfacin les condicions prescrites.

xiv Service Manual

4026-0XX

Japanese Laser Notice

Chinese Laser Notice

Notices and Safety Information xv

4026-0XX

Korean Laser Notice

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. 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.

Sicherheitshinweise

• Die Wartungsinformationen für dieses Produkt sind

ausschließlich für die Verwendung durch einen Wartungsfachmann bestimmt.

xvi Service Manual

4026-0XX

• 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 pastoujours

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.

• 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.

• Poiché non tutti i pezzi di ri cambio 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

Notices and Safety Information xvii

4026-0XX

personales durante e l 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.

• 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. Pertant, les característiques dels recanvis hauran de ser idèntiques o equivalents a les de les peces originals.

xviii Service Manual

4026-0XX

Chinese Safety Information

Korean Safety Information

Ozone Information

This product does not produce measurable amounts of ozone gas.

Notices and Safety Information xix

4026-0XX

Preface

This manual is divided into the following chapters:

• “General Information” contains a general description of the

printer, options, and the maintenanceapproach used to repairit. General environmental and safety instructions as well as special tools and test equipment are listed in this chapter.

• “Diagnostic Information” contains error code table, symptom

table, and service checks used toisolate failing field replaceable units (FRUs).

• “Diagnostic Aids” contains tests and checks used to locate or

repeat symptoms of printer problems.

• “Repair Information” provides instructions for making printer

adjustments and removing and installing FRUs.

• “Connector Locations” uses illustrations to identify the major

components and test points on the printer.

• “Parts Catalog” contains illustrations and part numbers for

individual FRUs.

xx Service Manual

4026-0XX

1. General Information

This printer is a letter-quality page printer designed to attach to an IBM PersonalComputer or other computers compatible with the IBM Personal Computer (with 386 processor or higher).

The printer is available in models 4026-06A, 06C, 06D, and 06J without Flash memory and models 4026-06B and 06F with Flash memory. Model upgrade is not available.

The printer can print in various pitches and has bit image graphics capability, allowing the user to print advanced graphics. Model 4026-06D has PostScript Level 2 emulation.

The model 4026-070 printer includes a manual input guide, additional memory and font selections. The 4026-071 is a label printing model which also includes a manual input guide, additional memory and font selections.

Options

Memory upgrade options are 1MB, 2MB, and 4MB. The paper tray option is a 250 sheet secondary paper tray. Contact your point of purchase for options available in your country.

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, service checks, and diagnostic aids to determine the symptom and repair the failure. After you complete the repair, perform tests as needed to verify the repair.

Tools Required For Service

Magnetic Phillips Screwdriver

General Information 1-1

4026-0XX

Acronyms

CSU Customer Setup DRAM Dynamic Random Access Memory EP Electrophotographic Process EPROM Erasable, Programmable Read-Only

Memory ESD Electrostatic Discharge FRU Field Replaceable Unit HVPS High Voltage Power Supply LASER Light Amplification by Stimulated Emission

of Radiation LCD Liquid Crystal Display LED Light-Emitting Diode LVPS Low Voltage Power Supply MROM Masked Read Only Memory NVRAM Nonvolatile Random Access Memory OEM Original Equipment Manufacturer PC Photoconductor POST Power-On Self Test ROM R ead Only Memory SIMM Single In-Line Memory Module SRAM Static Random Access Memory UPR Used Parts Return V ac Volts alternating current V dc Volts direct current

1-2

4026-0XX

2. Diagnostic Information

Start

CAUTION: interlock switch and the printhead shutter actuator at the same time. To perform some of the service checks and tests, such as

troubleshooting paper feed problems, you need to actuate the top coverinterlock switch with the covers opened or removed and power applied to the machine. It is important for personal safety that you

DO NOT, FOR ANY REASON

when power is on. Remove power from the printer before you connect or disconnect

any cable or electronic board or assembly for personal safety and to prevent damage to the printer.

Use the service error code, user error message, symptom table, service checks, and diagnostic aids in this chapter to determine the corrective action necessary to repair a malfunctioning printer.

The lights on the operator panel can indicate either a user error message or service error message. When a service error occurs the printer stops printing and all operator panel LEDs blink in a continuous pattern, indicating a service error, until the printer is powered off. If all operator panel LEDs are blinking, go to the

“Service Error Codes” on page 2-2.

When a user error message occurs, one or two operator panel LEDs are on solid or blinking. Go to the “User Error Message Table” on

page 2-6.

NEVER

manually actuate or disable the top cover

, disable the printhead shutter actuator

If your machine does not have a service error code and does not completePOST,gotothe“POST Symptom Table” on page 2-12.If your machine completes POST without an error, and you have a symptom, go to the “Symptom Table” on page 2-13. Locate your symptom and take the appropriate action.

If a service error code appears while you are working on the machine, go to the “Service Error Codes” on page 2-2 andtakethe indicated action for that error.

Diagnostic Information 2-1

4026-0XX

Service Error Codes

When a service error occurs the printer stops printing and all operator panel LEDs blink in a continuous pattern, indicating a service error, until the printer is powered off.

Press and release the operator panel button to display the service error code. Locate the blinking LEDs in the following table and take the indicated action.

Blinking Operator Panel LED Action

Software Service Error Code Run the Printer Diagnostic Test to

diagnose between the ROM SIMM and the controller board. If no other error code displays after the test completes, replace the controller board.

Fuser Failure Error Go to the “Cold Fuser Service

Mirror Motor Error The Polygon Mirror Motor is not

Laser Diode Failure Replace the printhead assembly. If

Check” on page 2-18.

rotating during printing. Replace the engine board. If this does not correct the problem, replace the printhead assembly.

this does not correct the problem, replace the engine board.

2-2

4026-0XX

Blinking Operator Panel LED Action

Controller Card Failure Replace Controller board

Optional Memory Error Replace the optional memory SIMM.

If this does not correct the problem, replace the controller board.

Fan Failure Error Go to the “Fan Service Check” on

page 2-17.

ROM Checksum Error Replace the ROM SIMM. If this does

not correct the problem, replace the controller board.

Base Memory Error Replace Controller board

Diagnostic Information 2-3

4026-0XX

Blinking Operator Panel LED Action

NVRAM Failure Error Replace Controller board

ASIC Register Failure Error Replace Controller board

ASIC SRAM Failure Error Replace Controller board

Flash Memory Failure Error Replace the ROM SIMM w/Flash. If

this does not correct the problem, replace the controller board.

Font Checksum Failure Error Replace the ROM SIMM. If this does

not correct the problem, replace the controller board.

2-4

4026-0XX

Blinking Operator Panel LED Action

Engine Board Communications Failure Error

Controller SRAM Failure Error Replace Controller board

Replace the engine board. If this does not correct the problem, replace the controller board.

Diagnostic Information 2-5

4026-0XX

User Error Message Table

When a user error message occurs the printer stops printing and one or two operator panel LEDs are on solid or blinking until the printer is powered off. Locate the printer’s LED Status in the following table and take the indicated action.

User Error Message LED Status Action

Paper Jam Paper Jam on solid Open cover and clear

anypaperjams.Close the top cover. If the error message is still present, go to the

“Paper Feed Service Check” on page 2-34.

Load Manual Paper/ Envelope

Load Paper/Load Envelope

Top Cover Open Error on solid Close the top cover.If

LoadPaperblinksand Press Button on solid

Load Paper on solid andPressButtonon solid

Load media into the manual slot and push the operator panel buttontoresume printing or do a front panel reset by pressing and holding the operator panel button for more than three seconds.

Load media in the appropriate paper tray and push the operator panel button to resume printing or do a front panel reset by pressing and holding the operator panel button for more than three seconds.

the error LED remains on solid and POST does not continue, go to the “Cover Inter-

lock Service Check” on page 2-16

2-6

4026-0XX

User Error Message LED Status Action

Memory Full/Complex Page/Resolution Reduction Warning/ Data Transmission Error

Flash Memory Full Error blinks and Press

Error on solid and Press Button on solid

Buttononsolid

The printer memory is full or the page is too complex to print. The printer is forced to reduce the resolution of a formatted page to 300 dpi before printing, or the printer is unableto maintain the required data transfer rate. Go to the “User

Secondary Error Message Table” on page 2-8.

This condition only occurs when the Flash SIMM is installed. (4026-06B or 4026-06F) Go to

the “User Secondary Error Message Table” on page 2-8.

Diagnostic Information 2-7

4026-0XX

User Secondary Error Message Table

Press and release the operator panel button two times to display the user secondary error LED status. Each press and release action must be performed within a half second. Locate the printer’s LED status in the following table and take the indicated action.

User Error Message LED Status Action

Complex Page Ready, Error, and

Press Button on solid

Memory Full Ready, Data, Error,

andPressButtonon solid

Switch the printing mode to a different printing mode using the Lexmark driver for Windows, or push the operator panel button to resume printing, or do a front panel reset by pressing and holding the operator panel button for more than three seconds.

Change the printing mode to Quick Print Plus or reduce the complexity of the job or the resolution, or push the operator panel button to resume printing, or do a front panel reset by pressing and holding the operator panel button for more than three seconds.

2-8

4026-0XX

User Error Message LED Status Action

Resolution Reduction Ready, Data blinking

and the Error, Press Buttononsolid

Data Transmission Error

Data,Error,andPress Buttononsolid

Switch from the GL/2 or raster mode to QuickPrint Plus mode using the Lexmark driver for Windows, or press the operator panel button to resume printing, or do a front panel reset by pressing and holding the operator button for more than three seconds.

Switch to Print Accelerator using the Lexmark driver for Windows i f 2MB of memory or more is installed, or switch to the GL/2 printing mode using the Lexmark driver for Windows, or push the operator panel button to resume printing, or do a front panel reset by pressing and holding the operator panel button for more than three seconds.

Flash Memory Full Error blinking and

Press Button on solid

This condition only occurs when the Flash memory is full.

Diagnostic Information 2-9

4026-0XX

Power-On Self Test (POST)

When you turn the printer on, it performs a Power-On Self Test. Check for correct POST functioning by observing the following:

1. All LEDs come on solid.

2. The fan turns on for 2 seconds.

3. All the LEDs turn off.

4. The engine board checks the status of the cover interlock switch.

5. The LEDs begin to turn on then off sequentially.

6. The fan turns off.

7. The engine board checks the status of the paper exit sensor.

8. The engine board checks the status of the thermistor.

9. The fuser lamp turns on. Note: The printer may be idle for up to 40 seconds asthe fuser

warms to operating temperature. Printer idle time is shorter if the fuser is already warm.

10. The polygon motor (printhead motor) turns on.

11. The main motor turns on.

12. The paper feed gears turn.

13. The print cartridge drive gear engages.

14. The paper feed take-up shaft and D-roll assembly rotates to home position. (The paper feed lift plate assembly is in the down position).

15. All the LEDs turn off.

16. Models 4026-06A, 06C, 06D and 06J,070 and 071 - The Ready LED turns on solid and the Data LED blinks. Go to Step 17.

Models 4026-06B and 06F- The Ready LED turns on solid and theDataLEDblinks.

• The controller board checks flash ROM installation.

• The controller board verifies that flash is formatted.

• The controller board attempts to format flash if unformatted.

• The Data LED blinks during format.

• The printer continues POST after format is complete.

• If format fails, a “Flash Memory Failure” error displays.

17. The main drive motor turns off.

2-10

4026-0XX

18. The polygon motor (printhead motor) turns off.

19. The Data LED turns off.

20. The Ready LED stays on solid. If your printer did not successfully complete POST, locate the

symptom in the “POST Symptom Table” on page 2-12 and take the appropriate action.

If the printer completes all these steps and no error indications are displayed, the printer has successfully completed the POST. If the printer has completed POST withoutan error anda symptom exists, go to the “Symptom Table” on page 2-13.

Diagnostic Information 2-11

4026-0XX

POST Symptom Table

Symptom Action

POST completes except one or more LEDs do not come on.

None of the LEDs come on. Goto the “Operator Panel Service

The printer is dead (No LEDs come on, no motor turns)

The fan does not come on. Go to the “Fan Service Check” on

The fuser lamp does not come on. Go to the “Cold Fuser Service

Thepolygon motor does not come on.

The main drive motor does not come on.

The paper feed gears do not turn. Go to the “Paper Feed Service

The paper feed solenoid picks and tries to feed paper.

The toner/print cartridge gears do not turn.

Go to the “Operator Panel Service Check” on page 2-27.

Check” on page 2-27. Go to the “Low Voltage Power Sup-

ply Service Check” on page 2-22.

page 2-17

Check” on page 2-18.

Replace the printhead assembly. If this does not fix the problem, replace the engine board.

Go to the “Main Drive Motor Service Check” on page 2-25.

Check” on page 2-34. Go to the “Paper Feed Service

Check” on page 2-34. Go to the “Main Drive Motor Service

Check” on page 2-25.

2-12

4026-0XX

Symptom Table

Locate your symptom in the following table and take the appropr i ate action

Symptom Action

Dead printer Go to the “Low Voltage Power Sup-

ply Service Check” on page 2-22.

Fan not working Go to the “Fan Service Check” on

page 2-17.

Fan noisy Go to the “Fan Service Check” on

page 2-17

Fuser parts melted Go to the “Cold Fuser Service

Check” on page 2-18.

Fuser Lamp doesn’t light Go to the “Cold Fuser Service

Check” on page 2-18.

Toner not fused to the paper Go to the “Cold Fuser Service

Check” on page 2-18.

Blank page Go to the “Print Quality Service

Check” on page 2-38.

Black page Go to the “Print Quality Service

High or heavy background Go to the “Print Quality Service

Offset print (image around characters)

Poor image (characters washed out)

Paper jams Go to the “Paper Feed Service

Main Drive Motor noisy Go to the “Main Drive Motor Service

Main Drive Motor does not move Go to the “Main Drive Motor Service

Main Drive Motor runs backward Replace the Engine board.

Check” on page 2-38.

Go to the “Print Quality Service

Check” on page 2-38.

Go to the “Print Quality Service

Check” on page 2-38.

Check” on page 2-34.

Check” on page 2-25.

Diagnostic Information 2-13

4026-0XX

Symptom Action

Paper is not picked or never leaves the primary tray

Paper is not picked or never leaves the optional paper tray (Tray 2)

Paper feeds continuously Goto the “Paper Feed Service

Paper fails to exit printer or stack in output bin

Paper skew Go to the “Paper Feed Service

Toner on theback of the page Go to the “Transfer Assembly Ser-

Poor print quality Go to the “Print Quality Service

Incorrect characters print Go to the “Print Quality Service

Printer not communicating with host

White or black lines or bands Go to the “Print Quality Service

Go to the “Paper Feed Frame Assembly Service Check” on page 2-37.

Go to the “Optional Paper Tray Two

Service Check” on page 2-28.

Check” on page 2-34.

Go to the “Paper Feed Service

Check” on page 2-34.

vice Check” on page 2-44.

Check” on page 2-38.

Go to the “Parallel Port Service

Check” on page 2-34.

Check” on page 2-38.

Paper wrinkled or bent Go to the “Paper Feed Service

Top cover will not close Go to the “Cover Interlock Service

Light print Go to the “Print Quality Service

Check” on page 2-34.

Check” on page 2-16.

Check” on page 2-38

2-14

4026-0XX

Service Checks

Charge Brush Service Check

Note: The charge brush charges the photoconductor and is located

inside the photoconductor unit.

FRU Action

Photoconductor Unit

Spots and marks can be caused by a defective charge brush inside the If there are any spots or marks, especially ones that appear in the same spot on the printed page, replace the

photoconductor unit.

Check the charge brush contact.

Main Drive Motor Gears

ChargeBrush Bias Contact (right side frame)

Photoconductor Unit Ground Contact

HVPS board Unplug the machine andcheck the HVPS for

Be sure the main drive motor and gears are operating correctly and turning the charge brush.

Check the charge brush bias contact located on the right side frame for damage, corrosion, wear or pitting. Intermittent failure of the charge brush contact can cause an all black page, horizontal black bars or lines. If any of these are found, replace the charge brush bias contact.

Check the photoconductorunit ground contact on the right side frame for damage. Intermittent failureof the photoconductor unit ground contact can cause print quality problems such as an all black page, horizontal black bars or lines. If any of these are found, replace the photoconductor unit ground contact.

correct mounting, pitted or discolored contacts. If the HVPS is damaged, replace as necessary. If no problems are found replace the photoconductor unit assembly.

photoconductor unit for a damaged

Diagnostic Information 2-15

4026-0XX

Cover I nterlock Service Check

FRU Action

Right Hand Transfer Bracket

Check the right hand transfer bracket actuator arm to be sure it contacts theinterlock switch actuator mounted in the LVPS.

Replace the bracket if the arm is damaged or broken.

Top Cover Interlock Switch

If the interlock switch is being actuated correctly, check the continuityof the switch between CN7A-1andCN7A-2onthecableasyouactivate the switch. If incorrect, replace the LVPS.

LVPS Be sure the voltage at CN7-1 measures +24 V

dc. If incorrect, turn the printer power off and disconnect the LVPS cable from theengine board. Turnthe printer power on. The voltage on the LVPS cable pin 1 should measure approximately+24Vdc.Ifincorrect,replacetheLVPS. If correct, go to the “Low Voltage Power Supply

Service Check” on page 2-22.

D-Roll Assembly Service Check

FRU Action

D-Roll Check the D-roll for wear, broken, or worn parts.

Replace as necessary.

2-16

D-Roll Clutch Assembly

Be sure the clutch assembly operates correctly. Replace as necessary.

Solenoid Be sure the paper feed solenoid operates cor-

rectly. If the solenoid fails to pick, go to the

“Paper Take-Up Solenoid Service Check” on page 2-32.

Paper Feed Drive Gears

Be sure the main drive/paper feed gears operate correctly. Check for broken teeth or damaged gears. Replace as necessary.

4026-0XX

Exit Sensor Service Check

FRU Action

Engine Board Disconnect the exit sensor cable from the

Exit Sensor Be sure the exit sensor is snapped in place and

Exit Sensor Flag

Exit Sensor Cable

Fan Service Check

FRU Action

Engine Board Turn the printer power off. Disconnect CN11

engine board. Check for +4.5 V dc to+5.5 V dc at CN8-1. If incorrect, replace the engine board.

the cable is firmly connected. Check the flag for damage and free movement

and replace as necessary. Be sure the exit sensor spring is properly installed and notdisconnected, damaged, or missing.

Reconnect the exit sensor cable and check the voltage at CN8-3on the engine board as you press the exit sensor flag. The voltage should change as the flag is moved in and out of the sensor.Ifincorrect,replacetheexitsensor.

Check the continuity of the cable. If incorrect, replace the exit sensor cable.

on the engine board. Turn the printer on and measure the voltage between CN11-1 and CN11-2. The voltage should read approximately +24 V dc. If incorrect, replace the engine board.

If correct, turn the printer off and connect CN11. Monitor the voltage between ground and CN11-1 (FAN*)immediately as you power on the printer.The voltage should go from +24 V dc with the fan motor off to approximately 0 V dc when the motor turns on. If incorrect, replace the fan motor and cable assembly.

Fan Motor/ Cable

Be sure the fan is properly installed if the fan is noisy. If correct, replace the fan motor assembly.

Diagnostic Information 2-17

4026-0XX

Cold Fuser Service Check

If all the Cold Fuser Service Check items are correct, go to the “Hot

Fuser Service Check” on page 2-20

Note: Toner buildupon the fuser input guide, paper separator, hot roll and backup roll causes paper jams.

When toner is partially fused to the paper it is usually caused by low fuser temperature.

Avoid handling the lamp as much as possible as it is easily broken. Be careful not to touch the glass housing with bare hands as the skin contains acids that can weaken the glass.

When making checks and handling the fuser lamp make sure you allow enough time for the fuser l amp and associated parts to cool.

FRU Action

Line Voltage The voltage to the printer must be within the fol-

lowing limits. 100 V ac (90 V ac - 110 V ac) Japan 120 V ac (108 V ac - 132 V ac) U.S. 220/230 V ac (207 Vac - 253 V ac) W.T.

Fuser Lamp Turn off the printer and wait a few minutes for

thefuserlamptocool.Turnthemachineonand observe the lamp turning on during POST. You can see the lamp through the left rear vents of the top cover. If the lamp lights, be sure the correct voltage lamp is installed. The voltage rating is stamped on one of the ceramic end pieces.

2-18

4026-0XX

FRU Action

Thermistor If thefuser lamp comes on and a fuser failure

LED error code displays, be sure the thermistor is contacting the hot roll and the thermistor cableisfirmlyseatedinconnectorCN2onthe engine board.

Checkforexcessivetoner buildup on the surface of the thermistor. Clean or replace as necessary.

Turn the printer power off and disconnect the thermistor cable from CN2 on the engine board. Measure the resistance of the thermistor between CN2-1 and CN2-2. The resistance should measure 250K ohms or less. If incorrect, replace the thermistor and cable assembly. If correct, replace the engine board.

Note: The thermistor assembly is fragile. Use care when handling to avoid damage.

Fuser Lamp Cable

If the fuser lamp does not come on and a fuser failure LED error codedisplays, unplug the printer power cord and check the continuity between the fuser cable contacts in the lower fuser cover. If incorrect, check the continuity of the fuser lamp, thermal fuse and terminals. Repair or replace as necessary.If correct, check the continuity of the fuser lamp cable. If incorrect, replace the cable. If correct, replace the following FRUs one at a time in theorder shown:

Engine Board LVPS If the lamp does not come on and the Error LED

is on solid, go to the “Fan Service Check” on

page 2-17

Fuser Thermostat (402606C and 06F)

Check the fuser thermostat if the fuser lamp does not come on or if it comes on and does not go off. Unplug the printer power cord and check the thermostat to be sure that it opens and closes properly.Replace as necessary.

Diagnostic Information 2-19

4026-0XX

Hot Fuser Service Check

Note: If you replace the fuser assembly for overheating, also

replace the engine board.

CAUTION: FUSER PARTS MAY BE HOT.

FRU Action

Fuser Assembly

Engine Board Replace the engine board if the fuser continues

Check for melted or damaged hot roll bearings, drive gear, paper separators, thermistor, hot roll, backup roll or frame parts. If the fuser assembly shows evidence of overheating or thermal damage, repair as necessary.

Note: If the lower fuser frame is damaged, replace the complete assembly.

to operate erratic or overheats.

Input Sensor Service Check

If the paper never leaves the tray or fails to be picked from the tray, go to the “Paper Feed Service Check” on page 2-34.

FRU Action

Paper Check the paper for rough edges, creases,

tears, or folds. Be sure the paper leaves the paper tray as soon

as it is picked by the D-Roll. If it does not, go to the “Paper Feed Service Check” on page 2-34.

Envelopes (if being used)

Be sure no more than 10 envelopes are stacked in the input paper tray. They may not pick or may jam at the input sensor or paper separator.

2-20

Note: Coated papers, synthetic papers, multi-sheet

forms, thermal papers, envelopes with windows, holes, cutouts, perforations, string-ties, metal fasteners, exposed flap adhesive, excessive curl, bent corners and some labels cause problems.

4026-0XX

FRU Action

Input Sensor Flag

Check the flag for damage, especially at the front edge, Be sure the flag moves freely. Replace the flag as necessary.

Input Sensor Be sure the input sensor is correctly installed

and the sensor/solenoid cable is properly connected.

Disconnect the input sensor cable from the CN3 connector on the engine board. The voltage at CN3-1 measures between +4.5 V dc and +5.5 V dc. If incorrect, replace the engine board.

If correct, reconnect the input sensor cable at CN3. Monitor the voltage at CN3-3 while moving the sensor flag in and out. The voltage changes from +2 V dc to 0 V dc. Ifincorrect, check the input sensor/solenoid cable continuity. If cable continuity is incorrect, replace the paper feed frame assembly. If cable continuity is correct, replace the following FRUs one at a time in the order shown:

Input Sensor Engine Board

Diagnostic Information 2-21

4026-0XX

Low Voltage Power Supply Service Check

Note: The controller board, HVPS and printhead assembly receive

power from the LVPS through the engine board. If the machine is dead, be sure the controller board i s correctly

seated in the engine board connector. Check and reseat all c ables.

Dead Printer

FRU Action

Line Voltage Check the AC line voltage. The voltages should

be within the following limits: 100 V ac (90 V ac - 110 V ac) Japan 120 V ac (108 V ac - 132 V ac) U.S. 220/230 V ac (207 V ac - 253 V ac) W.T.

LVPS The voltage measures approximately +5 V dc

between CN7-4 and ground on the engine board. If incorrect, disconnect CN7 on the engine board and measure the voltage between CN7-4 (+5 V dc) and CN7-3 (+5 V ground). The reading should measure approximately +5 V dc.

If +5 V dc is not present, unplug the printer line cord and check fuse F1. If the fuse is open, replace the fuse. If the fuse is not open, replace the LVPS.

Engine Board If +5 V dc is present when CN7 is disconnected

then disconnect CN2, CN4, CN5, CN9 and CN10 from the engine board. Also disconnect the controller board and remove the ROM SIMM and any optional memory SIMMs. Reconnect CN7 and check for +5 V dc. If incorrect, replace the engine board.

Controller Board

Reinstall the controller board. Check for +5 V dc atCN7-4.Ifincorrect,replacethecontroller board.

2-22

4026-0XX

FRU Action

ROM SIMM and Optional

Reinstall the ROM SIMM. Check for +5 V dc at

CN7-4. If incorrect, replace the ROM SIMM. Memory SIMM

Reinstall the optional memory SIMM if one was

installed. Check for +5 V dc at CN7-4. If incor-

rect, replace the optional memory SIMM.

HVPS Reconnect CN4 and check for +5 V dc at CN7-

4. If incorrect, replace the HVPS.

Printhead Assembly

Reconnect CN5 and CN10. Check for +5 V dc at

CN7-4. If incorrect, replace the printhead

assembly.

Thermistor Reconnect CN2 and check for +5 V dc at CN7-

4. If incorrect, replace the thermistor/cable

assembly.

Post Incomplete - ERROR LED remains on solid

Note: Be sure the top cover is closed when doing the following

checks.

FRU Action

LVPS Disconnect the LVPS cable from the engine

board.The voltage measures approximately +24

V dc between pin 1 (+24 V dc) and pin 2 (+24 V

dc ground). If incorrect, replace the LVPS.

Engine Board Reconnect the LVPS cable and measure the

voltage on CN7-1. The readingshould measure

approximately +24 V dc. If incorrect, disconnect

CN3, CN4, CN6, CN9, CN10 and CN11 from the

engine board. The voltage on CN7-1 measures

+24 V dc. If incorrect, r eplace the engine board.

If correct, reconnect one cable at a time check-

ing the voltage at CN7-1 until the FRU causing

the problem is found. Replace the failing FRU.

If the CN3 or CN9 are causing the problem, it is

necessary to disconnect each solenoid and

check the voltage at CN7-1. Replace the failing

FRU.

Diagnostic Information 2-23

4026-0XX

Fuse F1 continues to open after being replaced

FRU Action

Fuse F1 If fuse F1 continues to open after being

replaced, disconnect CN7 from the engine board and turn the printer poweron. If F1 opens, replace the LVPS.

If F1 does not open with CN7 disconnected, check the following:

Turn the printer power off and disconnect all the cables connected tothe engine board and remove the controller board. Reconnecteach cable and the controller board one at a time until the FRU causing F1 toopen is found. Replace thefailingFRU.

2-24

4026-0XX

Main Drive Motor Service Check

FRU Action

Main Drive Motor

Left Side Frame Gears

Disconnect CN6 from the engine board. Check

the motor for shorts between each pin on CN2

and the motor case. If continuity is indicated,

replace the motor.

Check the resistance between the following pins

on the cable connector. If incorrect, replace the

motor. If correct, replace the engineboard.

CN2-1 to CN2-2, 8 - 10 ohms

CN2-1 to CN2-1, 8 - 10 ohms

CN2-1 to CN2-4, 8 - 10 ohms

CN2-2 to CN2-3, 8 - 10 ohms

CN2-2 to CN2-4, 8 - 10 ohms

CN2-3 to CN2-4, 8 - 10 ohms

CN2-1 to CN2-5, 3 - 5 ohms

CN2-2 to CN2-5, 3 - 5 ohms

CN2-3 to CN2-5, 3 - 5 ohms

CN2-4 to CN2-5, 3 - 5 ohms

Remove the toner cartridge and print cartridge.

Manually rotate the paper feed gears on the left

side frame assembly and check for smooth

movement with no binds. If there are binds or

the gears do not turn, repairas necessary.

Paper Feed Frame Assembly

Associated Gears

Besurethepaperfeedframeassemblyiscor-

rectly installed and the drive gear is engaging

correctly.

Check the fuser gears, print cartridge, transfer

roll gear and photoconductor unit gears to make

sure they turn freely.Repair as necessary.

Diagnostic Information 2-25

4026-0XX

FRU Action

Motor Noise Checkthe motor for proper mounting, tight

mounting screws, and gearmesh. If incorrect, repair as necessary.If correct, replace the main drive motor.

If the motor continues to make noise after the motor is replaced, replace the engine board.

2-26

4026-0XX

Operator Panel Service Check

FRU Action

Operator Panel Assembly

LEDs

Be sure the operator panel cable is properly

seated in J5 on the controller board.

Run POST and check each LED for proper

operation.

If more than one LED does not light or an indi-

vidual LED stays on solid during POST, replace

the following FRUs one at a time in the order

shown:

Controller board

Operator panel

If all LEDs are very dim and operate erratically

during POST or all LEDs come on andstay on

solid during POST replace the following FRUs

one at a time in the order shown:

Operator panel assembly

Controller board

If none of the LEDs are on, be sure +5 V dc is

present at J1-2 on the controller board. If cor-

rect, replace the operator panel assembly. If

incorrect, replace the controller board.

If all the LEDs come on and remain on, replace

the following FRUs one at a time in the order

shown:

Operator Panel Assembly

Controller Board

Button Inoperative

Disconnect the operatorpanel cable at J5 on the

controller board. Check the continuity between

J5-5andJ5-6onthecableasyoupressthebut-

ton. The meter should read from approximately

10K ohms to approximately zero ohms when the

button is pressed.

If the continuity is incorrect, replace the operator

panel assembly. If correct,replace the following

FRUs one at a timein the order shown:

Operator Panel Assembly

Controller Board

Diagnostic Information 2-27

4026-0XX

Optional Paper Tray Two Service Check

Check the following before servicing tray two:

• Be sure tray one is working correctly.

• Be sure the second paper tray is correctly installed and the sec-

ond paper tray connector on the base printer properly contacts the second paper tray connector in the second paper tray.

• Be sure the second paper tray is selected in the user’s applica-

tion and no other application is on the selected port.

• Be sure the base printer and tray two connectors are not dam-

aged.

• Be sure the second paper tray drive gear in the base printer

operates correctly.

• Check the paper feed frame assembly for any obstruction or

damage in the area of the second paper tray feed slot that can cause the paper to catch or jam.

Note: Only paper can feed from tray two. Envelopes, label sheets, and transparencies must feed from tray one or manual feed.

Wrinkled or damaged paper

FRU Action

Paper Check the paper supply for wrinkled, damaged

or out of specification paper. Correct as necessary.

Paper Path Check the paper feed lift plate assembly, paper

empty flag, paper separators, paper feed rollers or anything in the paper path that might catch the paper or cause the paper to wrinkle.

Paper fails to leave Paper Tray Two - Solenoid never picks

FRU Action

Paper Check the paper supply for any paper that may

cause a problem.

2-28

4026-0XX

FRU Action

Paper Lift Plate Assembly

Check the liftplate assembly, release button,

button spring, release arm and all related hard-

ware for proper operation. Be sure thelift plate

D-roll pad mounted on the top of the lift plate is

not worn, contaminated or missing. Repair as

necessary.

Paper Empty Sensor Flag

Check the paper sensor flag for damage and

proper operation. Repair or replace as neces-

sary.

Paper Empty Sensor

Be sure the voltage at CN9-4 on the engine

board is between +4.5 V dc and +5.5 V dc.If

incorrect, replace the engine board. If correct,

check the voltage at CN9-6. The voltage

changes from approximately +2.00 V dc to 0 V

dc as you manually move the sensor flag in and

out of the sensor. If incorrect,be sure tray two

cable measures continuity. If incorrect, replace

the cable. If correct, replace the tray two sensor

board.

Second Paper Tray Solenoid/

Be sure the solenoid cable is connected to the

paper sensor board cable and the cable is prop-

erly connected to the sensor board. Engine Board/Solenoid Cable/ Tray Two Cable

Disconnect CN9 at the engine board. The volt-

age measures approximately +24 V dc at

CN9-1. If incorrect, replace the engine board. If

correct, reconnect CN9 and measure the volt-

age again at CN9-1. If the voltage continues to

be incorrect, check the resistance of the sole-

noid at the solenoid cable connector which mea-

sures from 60 to 90 ohms. If incorrect, replace

the tray two solenoid. If correct, be sure the

solenoid to sensor board cable measures conti-

nuity. If incorrect, replace the sensor board and

cable assembly. If correct, be sure the tray two

to engine board cable measures continuity. If

incorrect, replace the cable. If correct, replace

the tray two sensor board.

Diagnostic Information 2-29

4026-0XX

Paper Tray Two feeds paper. - Paper does not reach the input sensor in the base printer.

FRU Action

Second Paper Tray Gear Assembly

Second Paper Tray

Be sure the second paper tray drive assembly operates properly by manually feeding paper through the second paper tray. Repair as necessary.

Be sure the D-roll assembly operates properly. Repair as necessary.

D-Roll

Second Paper Tray

Be sure the D-roll clutch assembly operates

properly. Repair as necessary. D-Roll Clutch Assembly

Paper Feed Shaft, Gear

Be sure the paper feed gear, shaft and roller

operate properly. Repair as necessary. and Roller

Paper Feed Roller,Holder and Spring

Be sure the paper feed roller, holder and spring

that is mounted on the tray two base frame oper-

ates properly. Repair as necessary. Assembly

Base Printer Paper Feed Frame

Be sure there is no obstruction or damage at the

traytwo feed slot in the bottom of the paper feed

frame. Repair as necessary. Assembly

Note: If the problem appears to be with the base

printer paper feed frame, go to the “Paper Feed

Frame Assembly Service Check” on page 2-37

2-30

4026-0XX

Paper Tray Two selected in the application. Paper does not feed from Tray Two but instead feeds from Tray One. Tray Two reset to Tray One in printer utility.

FRU Action

Engine Board Be sure the voltage at CN9-8 on the engine

board measures approximately 0 V dc. If incorrect, turn the printer power off and measure the resistance between ground and CN9-8. Be sure the resistance measures 0 ohms. If incorrect, be sure the tray two cable measures continuity. If incorrect, replace the cable. If correct, replace the following FRUs one at a time in the order shown:

Engine Board Tray Two Sensor Board

Diagnostic Information 2-31

4026-0XX

Paper Take-Up Solenoid Service Check

FRU Action

Solenoid Be sure the solenoid/engine board cable is

firmly seated in connector CN3 on theengine

board.

Be sure the solenoid cable is firmly seated in the

solenoid/engine board cable connector at the

solenoid.

Check the solenoid for proper mechanical oper-

ation and that the solenoid spring is not broken,

loose, or stretched. Replace parts as necces-

sary.

Be sure the solenoid to paper lift plate ground

strap is installed correctly.

Disconnect the solenoid cable from CN3 on the

engine board. Check the resistance of the sole-

noid between CN3-5 and CN3-6 on the cable.

The resistance should measure between 60 to

90 ohms.

Check the continuity of the solenoid/engine

board cable. If the cable continuity is correct,

replace the solenoid. If the cable continuity is

incorrect, replace the paper feed frame assem-

bly.

Disconnect the solenoid from the solenoid/

engine board cable at the solenoid and check

the resistance between each pin on the solenoid

connector and the solenoid frame.If continuity is

indicated, replace the solenoid assembly.

2-32

4026-0XX

FRU Action

Engine Board Disconnect the solenoid/input sensor cable from

CN3 on the engine board. Check the voltage at CN3-5. The voltage should measure approximately +24 V dc. If incorrect, replace the engine board.

If the voltage reads approximately +24 V dc, check the voltage at CN3-6 while running a test page. The voltage should measure0 V dc and read approximately 1 V dc at the time the solenoid should pick. If incorrect, replace the engine board.

Diagnostic Information 2-33

4026-0XX

Parallel Port Service Check

1. Do a print test to be sure the printer prints correctly.

2. Be sure the printer parallel cable is designed for bi-directional printing.

3. Be sure the user application is set up correctly. Improper set up can prevent establishing a communication link with the printer.

4. Be sure controller board jumper J3 is located on pins two and three. J3 in this position causes the parallel port pull-up resistors to be disabled. Some computers have open collector outputs which require enabling the parallel port pull-up resistors.

Do the following to enable the pull-up resistors:

Turn the printer power off. Place J3 between pins one and two. Turn the printer power on and run POST. Run a print test page from the host.

5. If the printer still does not print, return J3 tothe original position.

6. If the internal print test page prints correctly, the user application and printer driver is set up correctly and the correct printer parallel bi-directional cable is installed.If the printer fails to print on command from the host, replace the controller board.

Paper Feed Service Check

CAUTION: To check the paper feed it may be necessary to run the

machine with the covers removed and the top cover interlock disabled. If this is necessary, NEVER disable both the top cover interlock and the printhead shutter actuator at the same time.

If it is necessary to run the machine to check for paper feed problems, open the top cover and disable the top cover interlock switch. You can feed paper after POST has completed by running the Normal Mode Print Test. To check some of the paper feed for proper operation, it may be necessary to remove the toner cartridge and photoconductor unit assemblies. Do not expose the photoconductor unit to direct sunlight. Keep it covered. The photoconductor will be damaged if exposed to light for any length of time.

2-34

4026-0XX

Wrinkled Paper/Envelope/Transparency

FRU Action

Paper Checkthe paper supply forwrinkled or damaged

paper, out of specification paper, envelopes or transparency material. Correct as necessary.

Paper Path Check the paper feed lift plate assembly, input

sensor actuator, paper separators, paper feed rollers or anything in the paper path that might catch the paper or cause the paper to wrinkle.

Paper Never Leaves The Tray or Fails To Reach The Input Sensor

Note: Remove the Optional Second Paper Tray if installed before

performing the following checks.

FRU Action

Paper Check the paper supply for any paper, envelope,

transparency, label, or index cards that may be causing a problem.

Paper TakeUp Solenoid

Be sure the paper take-up solenoid is picking. If incorrect go to the “Paper Take-Up Solenoid

ServiceCheck”onpage2-32.

Paper Frame Assembly

Checkthe paper feed frame assembly forproper operation. If incorrect go to the “Paper Feed

Frame Assembly Service Check” on page 2-37.

D-Roll Assembly

Check the D-Roll assembly for proper operation. If incorrect go to the “D-Roll Assembly Service

Check” on page 2-16

Paper Lift Plate Assembly

Print Media Selection Lever

Check the paper lift plate assembly for proper operation. If incorrect, replace the paper lift plate assembly.

Check the print media selection lever on models 06C and 06F for the correct setting. This is determined by the media being used ( labels,

card stock, paper, etc. ). (Models 06C and 06F)

Diagnostic Information 2-35

4026-0XX

Paper Never Reaches The Exit Sensor

FRU Action

Input Sensor Check the input sensor for proper operation. If

incorrect, go to the “Input Sensor Service

Check” on page 2-20.

D-Roll Assembly

Check the D-Roll assembly for proper operation. If incorrect go to the “D-Roll Assembly Service

Check” on page 2-16.

Paper Feed Frame Assembly

Check the paper feed frame assembly. Ifpaper is not being fed to the fuser assembly, go to the

“Paper Feed Frame Assembly Service Check” on page 2-37.

Fuser Assembly

Be sure the fuser assembly is free of excessive toner or other contamination and is operating correctly. Repair as necessary.

Paper Jam In The Fuser Assembly

FRU Action

Fuser Assembly

Check the fuser assembly for excessive toner build-up on the input paper guide, paper separators, hot roll, backup roll and any signs of damage, overheating, or broken and damaged parts. Repair as necessary.

Exit Sensor Go to the“Exit Sensor Service Check” on

page 2-17.

Any Jam After The Exit Sensor

FRU Action

Fuser Assembly

Manually turn the fuser drive gear and be sure the fuser drive assembly is working correctly.Be sure the paper feed exit shaft and gearare also operating properly. Repair as necessary.

Exit Sensor Go to the“Exit Sensor Service Check” on

page 2-17.

2-36

4026-0XX

FRU Action

Paper Feed Exit Shaft/

Check the paper feed exit shaft, rollers, and

gear for proper operation. Repair as necessary. Roller Assembly

Paper Feed Exit Shaft

Be sure the paper feed exit shaft ground termi-

nal is properly installed. Ground Terminal

Note: A poor ground contact allows static

buildup on the roller and causes paper feed

problems.

Top Cover Check the top cover to be sure it does not inter-

fere with the paper as it exits the fuser.

Paper Feed Frame Assembly Service Check

FRU Action

Paper Check the paper supply for any problems that

might prevent the paper feeding from the paper

feed lift tray . Frame

Assembly

Check the paper feed roller shaft gear forproper

operation or damage. If incorrect, repair as nec-

essary.Checkthe paper feed roller assembly for

proper operation or damage.If incorrect, replace

the roller assembly.

Checkthe paper separators for sticking, binding,

or damage. Replace as necessary.

Check the frame for signs of damage or warped

surfaces. If incorrect, replace the frame assem-

bly.

Diagnostic Information 2-37

4026-0XX

Print Quality Service Check

Before you perform the Print Quality Service Check, do the following:

• The toner cartridge can cause a variety of print quality prob-

lems. Be sure the toner cartridge is in good condition, works correctly, and is not low on toner. If in doubt, install a new toner cartridge before you proceed. The printer does not have a toner sensor.If the print is light, remove the tonercartridge and gently shake it to evenly distribute the toner.

• Turn PQET off.

• Set the print darkness setting to normal.

• Place the printer in the 300 dpi mode.

• Be sure the pr inter is clean, especially around the paper path,

print cartridge, and photoconductor unit.

• Some types of paper can cause print quality problems. Print

quality problems can also be caused by extreme environmental conditions like high temperature and humidity.

• An incorrect printer driver for the installed software can cause

problems.Incorrect characters could print and thecopy may not fit the page correctly

• Turn off PostScript on model 4026-06D before performing the

Print Quality Service Check.

2-38

FRU Action

Toner Cartridge

Photoconductor Unit

Transfer Assembly

Be sure the cartridge is installed correctly and not low on toner. Be sure the tonercartridge drive operates correctly.

Be sure the photoconductor unit is correctly installed and the cartridge drive is operating correctly.

If you have vertical marks or horizontal black bars on the page and these marks or bars are 126 mm (4.9 inches) or 55 mm (2.2 inches) apart, check the photoconductor unit.

Replace the transfer assembly if you have a horizontal black bar 57 mm from the top of page.

4026-0XX

Spot or Marks At Same Spot On Every Print

Note: Do not expose the photoconductor to light any longer than

necessary when you remove the photoconductor unit from the printer.

FRU Action

Photoconductor Unit Assembly

Fuser Paper Separators

Blank Page

FRU Action

Toner Cartridge

Printhead Be sure the printhead actuator in the top cover

Printhead Assembly

All Black Page

Remove the photoconductor unit assembly and

check the photoconductor for voids, spots, or

damage.

If black spots are observed approximately 70

mm apart, check the fuser paper separators for

toner buildup. Clean or replace as necessary.

Remove the toner cartridge and gently shake

the assembly to evenly distribute the toner.

actuates the printhead switch in the printhead

assembly.

Blank pages can be caused by a defective print-

head assembly or engine board.If the toner car-

tridge is operating correctly,replace the

printhead assembly. If this does not correct the

problem, replace the engine board.

Note: Incorrect laser exposure or incorrect charging of the photoconductor causes an all black page.

FRU Action

Right Side Frame Terminals

Check for a bent, broken, contaminated, or pit-

ted drum charge bias terminal ordrum ground

terminal located on the right side frame.

Replace as necessary.

Diagnostic Information 2-39

4026-0XX

FRU Action

Cables/Connectors

HVPS Contacts

Be sure the printhead cables to the engine board are properly seated.

Be sure the HVPS is correctly installed. Be sure the two high voltage contacts and the ground contact are not damaged. Repair as necessary.

HVPS Cover Check the HVPS cover for pitted or damaged

contacts. Replace as necessary.

Printhead Assembly,

If all the previous checks are correct, replace the

following FRUs one at a time in the order shown: Engine Board, HVPS

Printhead Assembly

Engine board

HVPS

White or Black Lines or Bands

Note: Poor image development, incorrect charging of the photocon-

ductor, incorrect laser exposure, poor image transfer, or poor fusing causes white/black bands or lines.

FRU Action

2-40

Toner Cartridge

Photoconductor Unit

Remove the toner cartridge and gently shake to

evenly distribute the toner. Check the cartridge

drive gear and contacts for damage. Replace

the toner cartridge as necessary.

Check the photoconductor unit for damage to

the drive gear or contact. Replace as necessary.

4026-0XX

FRU Action

Transfer Corona Cleaning

Fuser Assembly

Transfer Assembly

Printhead If all the previous checks are correct, replace the

Offset Print

FRU Action

Fuser Replace the lower fuser assembly.

Clean the corona wire to remove any toner that has accumulated. Open the top cover and locate the cleaning tool. Unsnap the cleaning tool from its holder. The corona wire is located directly in front of the transfer unit. Hook the cleaning tool under the transfer unit with the clear “needle’ facing you. As you slide the cleaning tool back and forth a few times to remove any toner buildup, you hear a clicking sound. If you do not hear this sound, the tool is not seated correctly. Return the cleaning tool to itsmounting in the topcoverandclosethecover.

Check the fuser for toner buildup. Be sure the hot roll, backup roll, and thermistor are not damaged. Repair as necessary.

Go to the “Transfer Assembly Service Check” on

page 2-44.

printhead assembly.

Diagnostic Information 2-41

4026-0XX

Excessive Background

Note: Poor development or poorly charged toner particles causes

excessive background. This is more noticeable as the toner cartridge nears end of life.

FRU Action

Toner Cartridge, Photoconductor Unit

White Spots

FRU Action

Transfer Assembly

Be sure the toner cartridge and photoconductor

unit are installed correctly.If installed correctly,

try a new toner cartridge and then a new photo-

conductor unit. If a new toner cartridge or photo-

conductor unit does not correct the problem,

replace the following FRUs one at a time in the

order shown:

HVPS

Engine board

Check the transfer assembly for any signs of

broken parts, pitting, contamination or foreign

objects attached to or in the area of thetransfer

roll.

If no problem is found, replace the following

FRUs one at a timein the order shown:

Transfer Assembly

HVPS

Light Print

2-42

FRU Action

Photoconductor Unit

Be sure the photoconductor unit is correctly

installed. Check the cartridge for damage and

pitted or contaminated contacts. If no problem is

found, replace the photoconductor unit.

4026-0XX

FRU Action

Toner Cartridge

Transfer Assembly

Replace the toner cartridge if the cartridge is nearing the end of life.

Check the transfer roll for toner buildup and contamination. Clean the transfer roll by performing POST two or three times.

Light print or black vertical streaks can be caused by an open transfer leakage current circuit. Check the transfer roll right side contact, TFR board lead and the TFR Leakage board (PWB-T) for damage or poorcontact.

If light print is still a problem, replace the following FRUs one at atime in the order shown:

HVPS Transfer Assembly TFR Leakage board PWB-T Engine board

Toner on backside of printed page

Note: Toner on the backof the printed page canbe caused by poor

fusing, improper development, or incorrect charging.

FRU Action

Fuser Assembly

Check the hot roll and backup roll for toner buildup. Clean or replace as necessary.

If the fuser assembly is clean and functioning correctly, replace the following FRUs one at a time in the order shown:

HVPS Engine board

Diagnostic Information 2-43

4026-0XX

Registration Service Check

Note: Use the Service Test Page to check the registration.

FRU Action

Paper Be sure the paper is correctly installed in the

paper tray. Registration

Adjustment

Perform the registration adjustment when the

engine board is replaced.

Transfer Assembly Service Check

Note: The transfer assembly left and right transfer bracket springs

bias the transfer assembly toward the photoconductor unit. Be sure the transfer assembly is free to move and biased toward the photoconductor unit.

FRU Action

Transfer Assembly

Be sure the transfer assembly is correctly

installed and the left and right transfer brackets

are properly positioned and fastened. Be sure

the left and right transfer bracket spr ings are

correctly installed and the transfer assembly is

free to move.

Check the transfer roll for toner buildup or dam-

age. Check the transfer roll drivegear for dam-

age or broken teeth. Check the transfer roll for

binds or improper operation and the right side

contact for damage. Replace thetransfer

assembly as necessary.

2-44

Replace the transfer assembly if you have a hor-

izontal black bar 57 mm from the top of page.

Check the Transfer Leakage board, wiring, con-

tacts and transfer roll for signs of damage or

poor contact.

4026-0XX

Transfer Corona Service Check

FRU Action

Transfer Corona

Be sure the transfer corona is clean. Clean with the transfer cleaning tool located onthe upper fuser cover.

Check the high voltage contacts for pitting, contamination, or damage. Be sure the corona assembly is correctly installed in the transfer assembly. Replace as necessary.

Be sure the wires T and TRET are not broken or damaged, and are properly connected to the transfer assembly and the HVPS. Replace as necessary.

ROMSIMMServiceCheck

FRU Action

ROM SIMM Be sure the correct ROM SIMM is installed.

Models 4026-06B and 06F require ROM SIMM with flash.

Be sure the ROM SIMM is correctly installed in location socket (J8).

Diagnostic Information 2-45

4026-0XX

3. Diagnostic Aids

This chapter explains the tests and procedures you can r un to identify printer failures and verify that repairs have corrected the problem.

Power-On Self Test (Post)

The printer performs the following Power-On Self Test when powered on:

1. All LEDs come on solid.

2. The fan turns on for 2 seconds.

3. All the LEDs turn off.

4. The engine board checks the status of the cover interlock switch.

5. The LEDs begin to turn on then off continuously.

6. The fan turns off.

7. The engine board checks the status of the paper exit sensor.

8. The engine board checks the status of the thermistor.

9. The fuser lamp turns on. Note: The printer may be idle for up to 40 seconds asthe fuser

warms to operating temperature. Printer idle time is shorter if the fuser is already warm.

10. The polygon motor (printhead motor) turns on.

11. The main motor turns on.

12. The paper feed gears turn.

13. The print cartridge drive gear engages.

14. The paper feed take-up shaft and D-roll assembly rotates to home position. (The paper feed lift plate assembly is in the down position).

15. All the LEDs turn off.

Diagnostic Aids 3-1

4026-0XX

16. Models 4026-06A, 06C, 06D and 06J,070 and 071 - The Ready LED turns on solid and the Data LED blinks. Go to Step 17.

Models 4026-06B and 06F- The Ready LED turns on solid and theDataLEDblinks.

• The controller board checks flash ROM installation.

• The controller board verifies that flash is formatted.

• The controller board attempts to format flash if unformatted.

• The Data LED blinks during format.

• The printer continues POST after format is complete.

• If format fails, a “Flash Memory Failure” error displays.

17. The main drive motor turns off.

18. The polygon motor (printhead motor) turns off.

19. The Data LED turns off.

20. The Ready LED stays on solid.

If the printer completes all these steps and no error indications are displayed, the printer has successfully completed the POST.

Diagnostic Aids 3-2

4026-0XX

Diagnostic Tests

Printer Diagnostic Test

The following tests run sequentially when performing this test:

Standard Memory Test Optional Memory Test Microcode Check LED Test Read/Write ASIC Register Test Read/Write ASIC SRAM Test Read/Write controller board SRAM Test

Perform the following steps to run the Printer Diagnostic Test:

1. Turn the printer off.

2. Open the top cover.

3. Press and hold the operator panel button as you turn on the printer. Release the button once the printer’s indicator lights come on.

4. Wait until the Error LED (top cover open indication) comes on.

5. Close the top cover.

6. The Ready LED comes on solid a nd the Data LED blinks. (This is the printer Busy Mode indication).

7. If all the diagnostic tests run correctly, the Ready LED goes off and the Data LED continues to blink. If a test fails, the error light pattern for the service error code displays on the operator panel.

3-3

4026-0XX

Service Diagnostic Test Page

The service diagnostic test page includes registration marks to aid in adjusting print registration and also includes the installed printer base code level. The service test page displays the user default values for the following:

Top Margin Offset Left Margin Offset Printer Page Count Permanent Page Count Print Darkness Setting PQET Setting (on/off) Toner Saver (on/off) Print Resolution

Perform the following steps to pr int the Service Diagnostic Test Page:

1. Turn the printer off.

2. Open the top cover.

3. Press and hold the operator panel button as you turn on the printer.

4. Wait until the Error LED comes on solid.

5. Close the top cover.

6. The Ready LED is on solid and the Data LED blinks continuously.

7. When the test is complete the Ready LED goes off and the Data LED continues to blink.

8. Press the operator panel button briefly.

9. The Ready and Data LEDs blink and the Service Diagnostic Test Page prints. The test page requires several seconds to start printing.

10. When the test page hasfinished printing the ReadyLED comes on solid and Data LED goes off.

Note: After the diagnostic test page prints, the printer automatically exits the diagnostic mode and returns to the normal mode.

Diagnostic Aids 3-4

4026-0XX

3-5

4026-0XX

User Mode Print Test Page

The User Mode Print Test Page displays the user default values, installed options, printer features, various typefaces, and the installed printer base code level.

1. Be sure the Ready LED is on solid (printer is in the readystate).

2. Press and release the operator panel button.

3. The Ready and Data LEDs blink continuously.

4. The test page prints and the operator panel Ready LED comes on solid and the Data light turns off.

5. The printer returns to the ready state.

Diagnostic Aids 3-6

4026-0XX

3-7

4026-0XX

Paper Feed Timing

The following describes the timing of paper flow through the printer to aid in diagnosing paper jam problems. Detection of paper in the printer paper feed path is accomplished by the low or high status condition of the paper entry and paper exit sensors. The timing of the paper as it leaves the input paper tray, passes the input sensor, exit sensor and into the exit tray, determines normal paper flow or a paper jam.

Single Sheet Printing: When condition twoin the following list is detected and there is no paper in the paper path the printer powers down except for the fuser lamp and fan motor.

Multi Sheet Printing: When condition two in the following list is detected and paper is in the paper path the printer powers down except for the fan motor.

• Both the paper entry and paper exit sensors are activated

whenever the printer is turned on or the top cover is closed.

• If the paper does not activate the paper entry sensor in the base

printer within two seconds after the D-roll starts rotating or within four seconds after the D-roll in theoptional second paper tray, if installed, starts rotating, a paper feed error occurs.

• If the paper entry sensor does not deactivate within eleven sec-

onds after the paper leading edge has activated the sensor, a paper jam error occurs.

• If the paper exit sensor is not activated within 3.5 to 4.5 seconds

after the leading edge of the paper has activated the paper entry sensor, a paper jam error occurs.

• If the paper exit sensor is not deactivated within 3.4 to 4.7 sec-

onds by the trailing edge of the paper, a paper jam error occurs.

Diagnostic Aids 3-8

4026-0XX

Fuser Operation

Fuser Mode Printer Action

Warm-Up Mode When the printer power is turned on

the fuser lamp turns on until thehot roll temperature reaches approximately 172 degrees centigrade.

Standby Mode The hot roll temperature reaches

approximately 156 degrees centigrade. If this temperature is maintained for three minutes, the printer switches to low temperature standby mode and the hot roll is maintained at 112 degrees centigrade.

Print Cycle The hot roll is maintained at 172

degrees centigrade if the engine board receives a print command from the controller board.

Note: The hot roll temperature is slightly higher on models 06C and 06F during the print cycle.

Fuser Control

The thermistor detects the hot roll temperature and sends a corresponding analog signal to the engine board. The engine board turns the lamp on or off depending on the analog signal from the thermistor.

If the thermistor detects a high temperature failure but the fuser lamp does not turn off, the thermal fuse opens (thermostat on models 4026-06C and 06F) and the engine board turns the fuser lamp off.

3-9

4026-0XX

Configuration Mode

The configuration mode gives the ability to set the following printer functions through the operator panel:

Hex Trace NPA Mode (Parallel) Parallel Protocol Advanced Status PPDA Activated Auto CRLF/LFCR

Perform the following steps to enter the configuration mode:

1. Turn the printer power off.

2. Open the top cover.

3. Turn the printer power on.

4. Top Cover Open (Error LED on) is displayed on the operator panel.

5. Double-click the operator panel button.

6. The printer is in the configuration m ode. The Ready LED is on solid. The Data, Load Paper, Paper Jam, Error and Press Button are off.

Note: Closing the top cover causes the printer to exit the configuration mode. Repeat the steps to reaccess the configuration mode.

Configuration Mode Operator Panel Overlay

The following overlay indicates the operator panel LED and button designations when in the configuration mode.

Hex Trace NPA Mode Parallel Protocol Advance Status CRLF/LFCR Off/On/Auto

Press three seconds to save

Diagnostic Aids 3-10

4026-0XX

Operator Panel Configuration Mode Button Definition

Term Description Result

Brief Button Press Press the operator

panelbuttonnolonger than three seconds.

Long Button Press Press and hold the

operator panel button for more than three seconds.

Double-Click Button Press

Press and release the operator panel button two times. Each press and release action must be performed within a half second.

This action moves through the configuration mode value list.

This action selects and saves the value for the menu item displayed. To indicate that the setting is saved, it is displayed on the operator panel.

This action moves through the configuration mode value list.

3-11

4026-0XX

Hex Trace

UseHexTracetoisolatethecauseofprintproblems.Whenajobis printed, the printer operator panel displays the Hex Trace indication, (Ready LED blinking), showing that the printer remains in the Hex Trace mode. Turn the printer power off or do a front panel reset (long button press) to exit the Hex Trace mode.

Perform the following steps to enter the Hex Trace mode:

1. Enter the configuration mode.

2. Doabriefbuttonpress.

3. The Ready LED is on and the Press Button (Off/On/Auto) is

on or off indicating the value selected. A brief button press causes the printer to cycle through the valid settings for Hex Trace and the Press Button LED turns on or off.

Operator Panel LED Status Action

Off/On/Auto LED and Hex Trace LED is off

Off/On/Auto LED and Hex Trace LED is on

A long button press causes the printer to exit configuration mode and enter the normal printing mode or a demo printing mode.

A double-click button press causes the next menu item, NPA mode, to display

A long button press causes the printer to exit the configuration mode and enter Hex Trace mode.

A double-click button press causes the next menu item, NPA mode, to display.

4. Press and hold the button until the Saved setting indication,

(all LEDs on solid) is posted.

5. When the Error LED comes on, close the top cover.

6. The printer completes POST with the Ready LED blinking

indicating the printer is in the Hex Trace mode.

7. Do a double-click to proceed to the next mode. Do an opera-

tor panel reset or turn the printer off to exit the Hex Trace mode.

Diagnostic Aids 3-12

4026-0XX

Restoring Factory Defaults

Restoring factory defaults returns the printer settings to the original factory settings.

Perform the following steps to invoke factory defaults:

1. Turn the printer power off.

2. Open the top cover.

3. Turn the printer power on. The printer starts POST.

4. The operator panel Error LED comes on solid.

5. Press and hold the operator panel button until all the LEDs are on solid indicating the printer isrestoring factory defaults.

6. Release the button. The printer indicates the operation is complete by turning all the LEDs off except the Error LED.

7. The configuration mode canbe selected by doing a brief button press or closing the top cover which causes the printer to enter either the normal mode or the demo mode.

3-13

4026-0XX

4. Repair Information

WARNING: Read the following before handling electronic parts.

Handling ESD-Sensitive Parts

Many electronic products use parts that are known to be sensitive to electrostatic discharge (ESD). To prevent damage to ESD-sensitive parts, follow the instructions below in addition to all the usual precautions, such as turning offpower before removing logic boards:

• Keep the ESD-sensitive part in its original shipping container (a

special “ESD bag”) until you are readyto install thepart into the machine.

• Make the least-possible movements with your body to prevent

an increase of static electricity from clothing fibers, carpets, and furniture.

• Put the ESD wrist strap on your wrist. Connect thewrist band to

the system ground point. This discharges any static electricity in your body to the machine.

• Hold the ESD-sensitive part by its edge connector shroud

(cover); do not touch its pins. If you are removing a pluggable module, use the correct tool.

• Do not place the ESD-sensitive part on the machine cover or on

a metal table; if you need toput down the ESD-sensitive part for any reason, first put it into its special bag.

• Machine covers and metal tables a re electrical grounds. They

increase the risk of damage because they make a discharge path from your body through the ESD-sensitive part. (Large metal objects can be discharge paths without being grounded.)

• PreventESD-sensitive parts from being accidentally touched by

other personnel. Install machine covers when you are not working on the machine, and do not put unprotected ESD-sensitive parts on a table.

• If possible, keep all ESD-sensitive parts in a grounded metal

cabinet (case).

• Be extra careful in working with ESD-sensitive parts when cold-

weather heating is used because low humidity increases static electricity.

Repair Information 4-1

4026-0XX

Adjustment Procedures

CAUTION: Be sure to unplug the power cord whenever you are working on the printer with one of the covers removed.

Print Registration Adjustment

Print the service diagnostic test page after you replace the engine board. Check the position of the bottom left and right registration lines. Adjust VR1 on the engine board to position both lines exactly on the trailing edge of the page. A slight turn on VR1 produces significant change in the registration line position. Turning the adjustment clockwise increases the gap between the registration lines and the trailing edge of the page and counter clockwise decreases the gap.

4-2

4026-0XX

Removal Procedures

CAUTION: Be sure to unplug the power cord whenever you are working on the printer with one of the covers removed.

Use caution when the photoconductor unit isout of the machine.Do not expose it to light formore than 15 - 20 minutes.

Screw Identification Table

Repair Information 4-3

4026-0XX

Board Cage Removal

1. Remove the controller board.

2. Remove the engine board.

3. Remove the two remaining screws that hold the board cage to the mainframe.

4. Note the way the cables are routed to the engine board before removing the board cage.

5. Remove the board cage.

Cover R emovals

Input Paper Tray

1. Press the left and right tray latches to allow the tray to rest at the lowest position.

2. Press the center of the input paper tray slightly to release the left and right side frame tabs.

3. Remove the input paper tray.

Left Side Cover

1. Loosen the two screws on the left side frame.

2. Release the bottom cover tabs.

3. Gently pull up and remove the left side cover.

Right Side Cover

1. Remove the two side cover screws that attach the right side cover to the board cage.

2. Rotate the right side cover down and remove.

Note: Be sure the lower front side cover mounting is properly snapped into place when you reinstall the right side cover. If installing a new right side cover on models 06C and 06F, transfer the print registration information label from the old cover to the new cover.

Front Cover

Pullthefrontcoverupandforwardtoremove.

4-4

4026-0XX

Top Cover

1. Unplug the power cord from the machine.

2. Remove the toner cartridge and P.C. drum.

3. Remove the left, right, and front covers.

4. Disconnect CN7, CN11, CN2, and CN8 from the engine board.

5. Remove the fuser lamp cable cover.

6. Remove the cable cover from the LVPS.

7. Disconnect the fuser lamp connector from the LVPS.

8. Remove the transfer assembly from the top cover.

9. Carefully disconnect the red leads.

10. Note the mounting and orientation of the left and right transfer assembly tension springs.

11. Remove the transfer assembly left and right tension springs.

12. Grasp the top cover. Use a screwdriver to pry the top cover left and right pivot arms from the main frame mounting pins.

13. Remove the top cover.

Controller Board Removal

1. Unplug the power cord from the machine.

2. Remove the right cover.

3. Disconnect the operator panel cable, J5 from the controller board.

4. Remove the operator panel.

5. Remove the two screws that mount the board cage.

6. Remove the two screws that mount the Centronix parallel interface connector to the board cage bracket.

7. Remove the three screws that mount the controller board.

8. Remove the controller board.

Repair Information 4-5

4026-0XX

D-Roll Removal

1. Remove the paper feed input tray assembly.

2. Remove the paper lift plate assembly.

3. Remove the m anual feed guide plate.

4. Remove the engine board.

5. Remove the controller board.

6. Remove the paper feed frame assembly.

7. Remove the left side plate assembly.

8. Remove the C-clip from both ends of the D-roll shaft.

9. Remove the D-roll clutch cam assembly.

Note: When you remove the clutch cam assembly, the D-roll shaft pin can fall from the shaft. Be careful not to lose the pin.

10. Slide the D-roll shaft slightly toward the left.

11. Remove the D-roll shaft by lifting and pulling the shaft toward the center of the printer.

Engine Board Removal

1. Unplug the power cord from the machine.

2. Remove the controller board.

3. Disconnect all the cables from the engine board.

4. Remove the three board mounting screws and remove the engine board.

Exit Sensor Removal

1. Remove the fuser upper and lower frame assemblies.

2. Disconnect the exit sensor cable.

3. Unsnap the sensor from the frame and remove.

Exit Sensor Flag Removal

1. Remove the fuser upper and lower frame assemblies. Note how the exit sensor flag torsion spring is mounted.

2. Unsnap the flag from the frame.

Note: Be careful when you handle the flag and spring. They are easily damaged.

4-6

4026-0XX

Exit Paper Feed Roller Assembly Removal

1. Remove the transfer assembly.

2. Remove the fuser upper and lower frame assemblies.

3. Note the orientation of the notches in the left and right bushings. Reinstall with the notches facing away from the top cover.

4. Be sure the right end of the shaft contacts the ground strap.

Fan Removal

1. Unplug the power cord from the machine.

2. Disconnect the fan cable from the engine board.

3. Remove the top cover.

4. Remove the transfer assembly.

5. Remove the fuser upper and lower frame assemblies.

6. Remove the top cover cable cover.

7. Remove the screw holding the fan assembly to the rear of the top cover.

8. Unlatch the fan cover assembly from the top cover.

9. Remove the fan assembly.

CAUTION: Be sure the fuser assembly has cooled before working on any of the following fuser FRUs.

Fuser Lamp Removal

1. Remove the fuser upper frame assembly.

2. Caution: Hold the left side fuser support plate and carefully remove the support plate screw. There is pressure against the other end of the lamp therefore care must be used when you remove the lamp from the fuser. Grip the lamp by the ceramic end piece and remove it fromthe fuser assembly. Be careful not to touch the glass.

3. Remove the fuser lamp.

Repair Information 4-7

4026-0XX

Fuser Lower Frame Assembly Removal

1. Remove the top cover.

2. Remove the fuser upper frame assembly.

3. Remove the four fuser lower frame assembly mounting screws.

4. Use a screwdriver to unlatch the left end of the fuser cable cover and remove the cover.

5. Remove the fuser lower frame assembly.

Fuser Upper Frame Assembly Removal

1. Remove the top cover.

2. Remove the left and right transfer assembly mounting brackets on models 4026-06A, 06B, 06D, and 06J. Remove the left and right transfer assembly mounting screws on models 4026-06C and 06F.

3. Remove the five screws that hold the fuser upper frame assembly and the left hand gear assembly.

4. Disconnect the exit sensor and thermistor cables.

5. Remove the fuser upper frame assembly.

Fuser Paper Separator Removal

1. Remove the top cover.

2. Remove the fuser upper frame assembly.

3. Note the type and location of each separator. The location and type are determined during manufacture.

4. Use a screwdriver to release the latch that holds the separator in position.

5. Remove the paper separator.

4-8

4026-0XX

HVPS Board Removal

1. Unplug the power cord from the machine.

2. Remove the HVPS cover.

3. Disconnect CN1 from the HVPS board.

4. Disconnect the transfer assembly high voltage connector from T1 on the HVPS board.

5. Disconnect the red transfer assembly wire at TRET on the HVPS board.

6. Remove the four HVPS board mounting screws.

7. Remove the HVPS board.

HVPS Cover Removal

1. Unplug the power cord from the machine.

2. Remove the screw holding the HVPS cover to the main frame.

3. Insert a screwdriver in the HVPS cover slot and release the cover latch.

4. Remove the HVPS cover.

Left Side Plate Removal

1. Unplug the power cord from the machine.

2. Remove the left, right, and front covers.

3. Remove the printhead assembly.

4. Remove the main drive motor.

5. Remove the four screws holding the left side plate to the main frame.

6. Slide the left side plate toward the front of the machine and remove.

Note: The main drive/paper feed gears are free to fall from their mounting studs with the left side plate removed. Be careful not to lose the gears.

Repair Information 4-9

4026-0XX

LVPS Removal

1. Remove the top cover.

2. Remove the four screws that secure the back of the rear frame to the LVPS.

3. Remove the two screws that hold the top of the rear frame to the LVPS and remove the rear frame.

4. Remove the two screws mounting the on/off switch to the main frame.

5. Remove the four screws holding the LVPS to the main frame.

6. Maneuver and lift the LVPS from the main frame.

Main Drive Motor Removal

1. Unplug the power cord from the machine.

2. Remove the right, left, and front covers.

3. Disconnect the main drive motor cable CN6 from the engine board.

4. Remove the two screws mounting the main drive motor to the left side plate.

5. Remove the main drive motor.

Main Drive/Paper Feed Gears Removal

1. Unplug the power cord from the machine.

2. Remove the right, left, and front covers.

3. Remove the printhead assembly.

4. Remove the main drive motor.

5. Remove the left side plate.

6. Remove the main drive/paper feed gears.

Manual Paper Feed Guide Plate Removal

1. Remove the paper feed input tray assembly.

2. Remove the paper lift plate assembly.

3. Remove the s crew holding the manual feed guide plate to the main frame.

4. Remove the manual paper feed guide plate.

4-10

4026-0XX

Operator Panel Removal

1. Unplug the power cord from the machine.

2. Remove the toner cartridge and P.C. drum.

3. Disconnect the operator panel cable from the controller board.

4. Loosen the frontoperator panel mounting screwfrom the board cage.

5. Remove the rear operator panel mounting screw from the board cage.

6. Remove the operator panel.

Paper Entry Sensor Removal

1. Remove the paper feed input tray assembly.

2. Remove the paper lift plate assembly.

3. Remove the manual feed guide plate.

4. Remove the engine board.

5. Remove the controller board.

6. Remove the paper feed frame assembly.

7. Disconnect the paper entry sensor cable.

8. Use a screwdriver to release the paper entry sensor latches.

9. Remove the paper entry sensor.

Paper Entry Sensor Flag Removal

1. Remove the paper feed input tray assembly.

2. Remove the paper lift plate assembly.

3. Remove the manual feed guide plate.

4. Remove the engine board.

5. Remove the controller board.

6. Remove the paper feed frame assembly.

7. Use a screwdriver to gently apply outward pressure on the flag pivots to release the flag from the mounting.

8. Remove the paper entry sensor flag.

Repair Information 4-11

4026-0XX

Paper Feed Frame Assembly Removal

1. Unplug the power cord from the machine.

2. Remove the paper feed input tray assembly.

3. Remove the paper lift plate assembly.

4. Remove the m anual feed guide plate.

5. Disconnect the paper feed sensor/solenoid cable CN3 from the engine board.

6. Remove the engine board.

7. Remove the controller board.

8. Remove the paper feed frame assembly.

Paper Feed Solenoid Removal

1. Remove the paper feed input tray assembly.

2. Remove the paper lift plate assembly.

3. Remove the m anual feed guide plate.

4. Remove the engine board.

5. Remove the controller board.

6. Remove the paper feed frame assembly.

7. Remove the paper feed solenoid mounting screw.

8. Disconnect the solenoid cable.

9. Remove the paper feed solenoid.

Paper Feed Input Tray Assembly Removal

1. Place the printer on it’s back.

2. Remove the four screws holding the paper feed input tray assembly to the frame.

3. Remove the paper feed input tray assembly.

Paper Lift Plate Assembly Removal

1. Place the printer on it’s back.

2. Remove the paper feed input tray assembly.

3. Press the lift plate assembly to the left.

4. Remove the paper lift plate assembly.

4-12

4026-0XX

Paper Separator Removal

1. Remove the paper feed input tray assembly.

2. Remove the lift plate assembly.

3. Remove the manual feed guide plate.

4. Remove the engine board.

5. Remove the controller board.

6. Remove the paper feed frame assembly.

7. Use a screwdriver to release either side of the separator latches.

8. Remove the paper separator.

Printhead Removal

1. Unplug the power cord from the machine.

2. Remove the left, right, and front covers.

3. Disconnect CN5 and CN10 printhead cables from the engine board.

4. Remove the four screws from the main frame.

5. Remove the 14 mm screw located in the center of the lower frame.

6. Gently pry the printhead locator tabs from the left and right main frame mounting slots and remove the printhead.

Print Media Selection Lever Removal (06C/06F/071)

1. Place the printer on it’s back.

2. Remove the selection lever mounting screw.

3. Remove the print media selection lever.

Second Paper Tray Option Connector Removal

1. Unplug the power cord from the machine.

2. Remove the left, right, and front covers.

3. Disconnect the CN9 cable from the engine board.

4. Remove the two screws holding the option connector to the main frame.

5. Remove the second paper tray option connector.

Repair Information 4-13

4026-0XX

Thermal Fuse Removal (06A/06B/06D/06J/070)

1. Remove the top cover.

2. Remove the fuser upper frame assembly.

3. Remove the two screws mounting the thermal fuse.

4. Remove the thermal fuse.

Thermostat Removal (06C/06F/071)

1. Remove the top cover.

2. Remove the fuser upper frame assembly.

3. Remove the two thermostat mounting screws.

4. Remove the fuser thermostat.

Thermistor Removal

1. Remove the fuser lower frame assembly.

2. Remove the screw that holds the thermistor to the left side of the fuser lower frame assembly.

3. Note the routing of the thermistor cable and remove the thermistor.

Transfer Unit Removal

Models 4026-06A, 06B, 06D, 06J and 070

1. Remove the top cover.

2. Remove the screw holding the right transfer assembly bracket.

3. Note the mounting and orientation of the left and right transfer assembly tension springs.

4. Remove the transfer assembly.

5. Remove the transfer assembly tension springs.

4-14

4026-0XX

Models 4026-06C, 06F and 071

1. Open the top cover.

2. Remove the transfer cable cover screw and transfer cable cover.

3. Remove the two screws that hold the transfer unit to the rear of the top cover.

4. Unplug the wire to the transfer roll assembly. Pay attention to the wire routing.

5. Remove the transfer unit.

Repair Information 4-15

4026-0XX

5. Connector Locations

Low Voltage Power Supply

Connector Pin No. Signal CN1 Engine Board 1+24Vdc

2GND 3GND 4+5Vdc 5FUSERLAMP*

CN2 Fuser Lamp/ Thermal Fuse

1HEATN 2 NO CONNECTION 3HEATL

Connector Locations 5-1

4026-0XX

High Voltage Power Supply

Connector Pin No. Signal CN1 Engine Board 1HVC

2HVT* 3HVSEL2* 4HVSEL1* 5HVB 6BIASMON 7GND 8+24Vdc

T T HV to TRANSFER

CORONA CHARGE

TRET TRET HV to TRANSFER

CORONA HOUSING

Connector Locations 5-2

4026-0XX

Engine Board

CN1A Controller Board Pin No. Signal Pin No. Signal

1 NO CONNECTION 16 CMD* 2 NO CONNECTION 17 CTBSY* 3 NO CONNECTION 18 PRINT* 4 NO CONNECTION 19 SRCLK* 5GND 20 GND 6 RESET* 21 GND 7 GND 22 VIDEO* 8GND 23 +5Vdc

9GND 24 GND 10 HSYND* 25 +5 V dc 11 EPRDY* 26 GND 12 PRRDY* 27 +5 V dc 13 TDD* 28 CPRDY* 14 ETBSY* 29 +5 V dc 15 STS* 30 TEST*

Connector Pin Signal CN2A Thermistor 1 THERMISTOR

2+5Vdc

CN3A Paper Entry Sensor and Paper Take-up Solenoid

1 ANODE (PC1) 2GND 3PC1* 4 NO CONNECTON 5+24Vdc 6FEED1*

5-3

4026-0XX

Connector Pin Signal CN4A HVPS 1HVC

2HVT* 3HVSEL2* 4HVSEL1* 5HVB 6BIASMON 7GND 8+24Vdc

CN5A Laser Diode Drive Board

CN6A Main Motor 1PHASEA

CN7A LVPS 1+24Vdc

CN8A Paper Exit Sensor

1SSCAN 2CO 3 LD APC2 (LDVR2) 4 LD APC1 (LDVR1) 5GND 6LDATA* 7+5Vdc

2PHASEA* 3PHASEB 4PHASEB*

2GND 3GND 4+5Vdc 5FUSERLAMP* 1 ANODE (PC3) 2GND 3PC3*

Connector Locations 5-4

4026-0XX

Connector Pin Signal CN9A 2nd Paper Tray

(Option)

CN10A Polygon Motor 1 NO CONNECTION

CN11A Fan Motor 1FAN*

1+24Vdc 2FEED2* 3 NO CONNECTION 4+5Vdc 5GND 6 P EMP2 7PSIZED 8 2NDBIN*

9 MM/INCH 10 CHECK0* 11 CHECK1* 12 CHECK2*

2+24Vdc

3GND

4+5Vdc

5 POLYGON CONTROL

2+24Vdc

5-5

Lexmark OptraTM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. General Information

Options

Maintenance Approach

Tools Required For Service

Acronyms

2. Diagnostic Information

Start

Service Error Codes

User Error Message Table

User Secondary Error Message Table

Power-On Self Test (POST)

POST Symptom Table

Symptom Table

Service Checks

Charge Brush Service Check

Cover I nterlock Service Check

D-Roll Assembly Service Check

Exit Sensor Service Check

Fan Service Check

Cold Fuser Service Check

Hot Fuser Service Check

Input Sensor Service Check

Low Voltage Power Supply Service Check

Main Drive Motor Service Check

Operator Panel Service Check

Optional Paper Tray Two Service Check

Paper Take-Up Solenoid Service Check

Parallel Port Service Check

Paper Feed Service Check

Paper Feed Frame Assembly Service Check

Print Quality Service Check

Registration Service Check

Transfer Assembly Service Check

Transfer Corona Service Check

ROMSIMMServiceCheck

3. Diagnostic Aids

Power-On Self Test (Post)

Diagnostic Tests

Printer Diagnostic Test

Service Diagnostic Test Page

User Mode Print Test Page

Paper Feed Timing

Fuser Operation

Configuration Mode

Hex Trace

Restoring Factory Defaults

4. Repair Information

Handling ESD-Sensitive Parts

Adjustment Procedures

Removal Procedures

Screw Identification Table

Board Cage Removal

Cover R emovals

Controller Board Removal

D-Roll Removal

Engine Board Removal

Exit Sensor Removal

Exit Sensor Flag Removal

Exit Paper Feed Roller Assembly Removal

Fan Removal

Fuser Lamp Removal

Fuser Lower Frame Assembly Removal

Fuser Upper Frame Assembly Removal

Fuser Paper Separator Removal

HVPS Board Removal

HVPS Cover Removal

Left Side Plate Removal

LVPS Removal

Main Drive Motor Removal

Main Drive/Paper Feed Gears Removal

Manual Paper Feed Guide Plate Removal

Operator Panel Removal

Paper Entry Sensor Removal

Paper Entry Sensor Flag Removal

Paper Feed Frame Assembly Removal

Paper Feed Solenoid Removal