Xerox Phaser 4 400 Bedienungsanleitung

Service

Manual

Phaser™

Laser Printer

4400

haser 4400 Laser Printer Service Manual xiii

Contents

General Information 1-1

SectionContents.................................... 1-1

Phaser 4400 Laser Printer Overview . . . . . . . . . . . . . . . . . . . . 1-2

PartsofthePrinter .................................. 1-4

MachineOrientation ................................ 1-12

Menu Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Printer Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Error Messages and Codes 2-1

SectionContents.................................... 2-1

Introduction........................................ 2-1

Service Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

PrinterErrorMessages.............................. 2-11

Image Processor POST Error Codes . . . . . . . . . . . . . . . . . . . 2-58

Troubleshooting 3-1

SectionContents.................................... 3-1

Introduction........................................ 3-1

Measurements ..................................... 3-1

Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Image-Quality Checkout Procedures . . . . . . . . . . . . . . . . . . . 3-41

Image-Quality Troubleshooting Procedures . . . . . . . . . . . . . . 3-53

Tests Prints, Adjustments, and NVRAM Reset 4-1

SectionContents.................................... 4-1

ServiceTestPrints .................................. 4-1

Adjustments ....................................... 4-5

ResettingNVRAM................................... 4-7

xiv

Cleaning and Maintenance 5-1

Service Preventive Maintenance Procedure . . . . . . . . . . . . . . . 5-1

FRU Disassembly 6-1

List of Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Covers and Trays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

Tray1 ...........................................6-18

Paper Feed (Tray 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28

Paper Feed (MPT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-44

Paper Transportation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-57

Exit Assembly and Fuser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-65

Xerographics......................................6-79

MainDrive........................................6-84

Electrical.........................................6-87

Stacker .........................................6-101

Optional Paper Feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-120

DuplexUnit......................................6-141

Envelope Feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-157

Parts Lists 7-1

PartsListIndex.....................................7-1

UsingthePartsLists.................................7-1

Theory of Operation 8-1

SectionContents....................................8-1

PrintProcessOverview...............................8-3

PrintProcessDescription .............................8-5

The Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11

DriveFlow........................................8-14

Engine Logic Board and Front Panel Functions . . . . . . . . . . . 8-22

ImageProcessorBoard..............................8-22

PowerSupplies....................................8-23

Interlocks.........................................8-24

Phaser 4400 Laser Printer Service Manual xv

LaserControl ..................................... 8-25

FuserControl ..................................... 8-26

EraseCycle....................................... 8-28

FanControl....................................... 8-28

DuplexPrinting.................................... 8-29

Envelope Feeder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-33

Stacker .......................................... 8-37

Option Feeder Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-42

Wiring Data 9-1

SectionContents.................................... 9-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2

Base Engine Wiring Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4

550-Sheet Feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-22

DuplexUnit....................................... 9-26

Stacker ....... ............................ 9-31

Envelope Feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-37

Phaser 4400 Laser Printer Service Manual 3-1

Troubleshooting

Introduction

This section covers two ty ubleshooting procedures:

■Troubleshooting proce problems not directly associated with error

messages or codes

■Troubleshooting Proce mage-quality (IQ) problems

Troubleshooting procedu rmally isolate a problem to a specific component

or subassembly, in some ding the wire harnesses.

In the Yes/No steps of the s, a Yes/No response will either lead you to the

next step or will indicate e action. When you complete the indicated

corrective action, restart t Check to verify that the problem has been

corrected.

Measureme

Power and signal grounds are connected to frame ground. You can perform all circuit

troubleshooting using the metal frame (chassis) as the grounding point. If you need

more information to locate connectors or test points, refer to Wiring Data on page 9-1.

Unless otherwise specified, the following voltage tolerances are used within this

section:

Section Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Index of Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Image-Quality Checkout Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-41

Index of Image-Quality Checkout Procedures . . . . . . . . . . . . . . . . . . . . . . . . 3-41

Image-Quality Troublesh ocedures . . . . . . . . . . . . . . . . . . . . . . . .3-53

Index of Image-Quali ooting Procedures . . . . . . . . . . . . . . . . . . . 3-53

Voltage Measurements

Stated Measured Stated Measured

+3.3 VDC +3.0 to 3.6 VDC +24.0 VDC +21.6 to +26.4 VDC

+5.0 VDC +4.8 to +5.2 VDC 0.0 VDC Less than +0.5 VDC

3-2 Phaser 4400 Laser Printer Service Manual

Troubleshooting Procedures

Verifying AC Power

There is a possible problem with AC power.

Warning: Improper connection of the grounding conductor can

result in the risk of electrical shock.

The following must be observed:

■Never use a ground adapter plug to connect the machine to a power source.

■Never attempt any maintenance function that is not specifically called out in

the service procedures.

■Never remove any covers that are fastened with screws, unless so instructed

in the service procedures.

Caution: If any of the voltage measurements are not as specified in

the following steps, the cause must be corrected. Caution

the customer NOT to connect the machine to the wall

outlet. Advise the customer that a licensed electrician must

correct the wiring. Do not attempt to correct the wiring

yourself. If you later find the condition has not been

corrected, inform your manager in writing of the improper

wiring.

Index of Troubleshooting Procedures

Verifying AC Power . . . . . . . . . . . . . . . . .3-2 Print Cartridge Sensor Assembly . . . . . 3-24

DCPower(LVPS)...................3-4 Tray Motor Assembly Checkout . . . . . . 3-26

DC Power Loading . . . . . . . . . . . . . . . . . .3-6 Registration Clutch . . . . . . . . . . . . . . . . 3-27

Toner Sensor Failure . . . . . . . . . . . . . . . .3-8 Turn Roller Clutch Assembly. . . . . . . . . 3-28

Inoperative Printer . . . . . . . . . . . . . . . . . .3-9 Tray 1 Feed Clutch . . . . . . . . . . . . . . . . 3-29

Malfunctioning Front Panel. . . . . . . . . . .3-11 MPT Pick Up Solenoid . . . . . . . . . . . . . 3-30

Inoperative Front Panel . . . . . . . . . . . . .3-13 Image Processor Isolation. . . . . . . . . . . 3-31

Erratic Printer Operation. . . . . . . . . . . . .3-13 High-Voltage Power Supply (HVPS)

Assembly........................3-31

PowerSupply.....................3-14 Electrical Noise . . . . . . . . . . . . . . . . . . . 3-33

Main Motor Assembly. . . . . . . . . . . . . . .3-15 ExitSensor ......................3-34

Laser Assembly . . . . . . . . . . . . . . . . . . .3-17 ExitMotor .......................3-35

Fuser Assembly . . . . . . . . . . . . . . . . . . .3-18 550-Sheet Feeder Feed Clutch . . . . . . . 3-36

Registration Sensor . . . . . . . . . . . . . . . .3-20 Stacker Full Sensor . . . . . . . . . . . . . . . . 3-37

MPT No Paper Sensor . . . . . . . . . . . . . .3-21 Stacker Offset Operation Not Performed3-38

Tray 1 No Paper Sensor. . . . . . . . . . . . .3-22 Envelope Feed Clutch . . . . . . . . . . . . . . 3-38

Output Tray Full Sensor . . . . . . . . . . . . .3-22 Envelope No Paper Sensor. . . . . . . . . . 3-39

Stack Height Sensor Checkout. . . . . . . .3-23

Phaser 4400 Laser Printer Service Manual 6-1

ssembly

This section contains step emoval procedures for a specific component or

assembly. Numbers in the ns refer to steps in the procedure. For example: if

step 3 in a procedure instr o remove a screw, the screw in the illustration is

labeled 3. Unless a specif ment procedure is included, reassembly is the

reverse of disassembly.

Illustrations are used to a ith the procedures. You should refer to the

specific Parts List illustra under the repair title) for locating most

components within a proc

Caution: Always rein orrect type and size screws. Using the

wrong screw age tapped holes.

Caution: Do not use e orce to either remove or install a part.

Locations, such as left, ri or rear, given in the repairs assume you are facing

the printer front panel.

The Print Cartridge should be removed and stored in a dark, safe place when

performing any procedure where screws or components may damage the cartridge

and where exposure to light could degrade performance.

List of Procedures

Covers and Trays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

RRP1.1LeftInterfaceCover ......................................6-6

RRP1.2LeftCover..............................................6-7

RRP1.3OptionCover............................................6-8

RRP1.4TopCoverAssembly......................................6-9

RRP 1.5 Right Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-10

RRP1.6FrontCoverAssembly ...................................6-11

RRP1.7LeftFrontCover........................................6-12

RRP 1.8 Rear Cover Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-13

RRP 1.9 Front Panel Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-14

RRP1.10InterlockCover........................................6-15

RRP1.11LeftPlate.............................................6-16

RRP1.12PlateHandle..........................................6-17

Tray1........................................................6-18

RRP 2.1 Retard Roller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-18

RRP 2.2 Friction Clutch Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-20

RRP2.3RetardSpring..........................................6-22

RRP2.4MotorAssembly ........................................6-24

RRP 2.5 Paper Feeder Connector and Socket Guide. . . . . . . . . . . . . . . . . . .6-26

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