Xerox Phaser 6250 Service Manual

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Phaser

Color Laser Printer

Service

Manual

6250

Phaser® 6250

Warning

Color Laser Printer

Service Manual

The following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that contained in the operating instructions, unless you are qualified to do so.

First Printing: July, 2003

071-0869-00

Service Terms

Note

Caution

Warning

Manual Terms

Various terms are used throughout this manual to either provide additional information on a specific topic or to warn of possible danger present during a procedure or action. Be aware of all symbols and terms when they are used, and always read NOTE, CAUTION, and WARNING statements.

Common Acronyms:

The following list defines the acronyms that may be fournd in this manual.

ADC: Automatic Density Control MCU: Engine Control Board BTR: Bias Transfer Roller NCS: Non-Contact Sensor CRUM: Customer Replaceable Unit

Monitor

CTD: Toner Density Control PL: Corresponds to the FRU Parts List. DRV: Motor Driver Board RMI: Routine Maintenance Item ESD: Electrostatic Discharge ROS: Laser Scanning Unit IDT: Intermediate Transfer Unit RTC: Charge Roller

PHD: Imaging Unit

A note indicates an operating or maintenance procedure, practice or condition that is neccessary to efficiently accomplish a task. A note can provide additional information related to a specific subject or add a comment on the results achieved through a previous action.

A caution indicates an operating or maintenance procedure, practice or condition that, if not strictly observed, results in damage to, or destruction of, equipment.

A warning indicates an operating or maintenance procedure, practice or condition that, if not strictly observed, results in injury or loss of life.

Product Terms

Caution: A personal injury hazard exists that may not be apparent. For example, a

panel may cover the hazardous area.

Danger: A personal injury hazard exists in the area where you see the sign.

iv Phaser 6250 Color Printer

Symbols Marked on the Product

30 min.

DANGER high voltage.

Protective ground (earth) symbol.

Hot surface on or in the printer. Use caution to avoid personal injury.

The surface is hot while the printer is running. After turning off the power, wait 30 minutes.

Avoid pinching fingers in the printer. Use caution to avoid personal injury.

Use caution (or draws attention to a particular component). Refer to the manual(s) for information.

Service Manual v

Power Safety Precautions

Power Source

For 110 VAC printers, do not apply more than 140 volts RMS between the supply conductors or between either supply conductor and ground. Use only the specified power cord and connector. For 220 VAC printers, do not apply more than 264 volts RMS between the supply conductors or between either supply conductor and ground. Use only the specified power cord. This manual assumes that the reader is a qualif ied service technician.

Plug the three-wire power cord (with grounding prong) into a grounded AC outlet only. If necessary, contact a licensed electrician to install a properly grounded outlet. If the product loses its ground connection, contact with conductive parts may cause an electrical shock.

Disconnecting Power

Turning the power off using the On/Off switch does not completely de-engergize the printer. You must also disconnect the printer power cord from the AC outlet. Position the power cord so that it is easily accessible during servicing so that you may power down the printer during an emergency . Disconnect the po wer plug by pulling the plug, not the cord.

Disconnect the power cord in the following cases:

■ if the power cord or plug is frayed or otherwise damaged,

■ if any liquid or foreign material is spilled into the case,

■ if the printer is exposed to any excess moisture,

■ if the printer is dropped or damaged,

■ if you suspect that the product needs servicing or repair,

■ whenever you clean the product.

vi Phaser 6250 Color Printer

Electrostatic Discharge (ESD) Precautions

Some semiconductor components , and the respective sub-assemblies that contain them, are vulnerable to damage by Electrostatic discharge (ESD). These components include Integrated Circuits (ICs), Large-Scale Integrated circuits (LSIs), field-effect transistors and other semiconductor chip components. The following techniques will reduce the occurrence of component damage caused by static electricity.

Be sure the power is off to the chassis or circuit board, and observe all other safety precautions.

■ Immediately before handling any semiconductor components assemblies, drain

the electrostatic charge from your body. This can be accomplished by touching an earth ground source or by wearing a wrist strap device connected to an earth ground source. Wearing a wrist strap will also prevent accumulation of additional bodily static charges. Be sure to remove the wrist strap before applying power to the unit under test to avoid potential shock.

■ After removing a static sensitive assembly from its anti-static bag, place it on a

grounded conductive surface. If the anti-static bag is conductive, you may ground the bag and use it as a conductive surface.

■ Do not use freon-propelled chemicals. These can generate electrical charges

sufficient to damage some devices.

■ Do not remove a replacement component or electrical sub-assembly from its

protective package until you are ready to install it.

■ Immediately before removing the protective material from the leads of a

replacement device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

■ Minimize body motio ns when handling unpackaged replacement devices. Motion

such as your clothes brushing together, or lifting a foot from a carpeted floor can generate enough static electricity to damage an electro-statically sensitive device

■ Handle IC’s and EPROM’s carefully to avoid bending pins.

■ Pay attention to the direction of parts when mounting or inserting them on

Printed Circuit Boards (PCB’s).

Service Manual vii

Service Safety Summary

General Guidelines

For qualified service personnel only: Refer also to the preceding Po wer Safety

Precautions.

Avoid servicing alone: Do not perform internal service or adjustment of this

product unless another person capable of rendering first aid or resuscitation is present.

Use care when servicing with power: Dangerous voltages may exist at several

points in this product. To a v oid personal injury , do not touch exposed connections and components while power is on. Disconnect power before removing the power supply shield or replacing components.

Do not wear jewelry: Remove jewelry prior to servicing. Rings, necklaces and

other metallic objects could come into contact with dangerous voltages and currents.

Power source: This product is intended to operate from a power source that will

not apply more then 264 volts rms for a 220 volt AC outlet or 140 volts rms for a 110 volt AC outlet between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

Warning Labels

Read and obey all posted warning labels. Throughout the printer, warning labels are displayed on potentially dangerous components. As you service the printer, check to make certain that all warning labels remain in place.

Safety Interlocks

Make sure all covers and the printer’s front panel are in place and all interlock switches are functioning correctly after you have completed a printer service call. If you bypass an interlock switch during a service call, use extreme caution when working on or around the printer.

CLASS 1 LASER PRODUCT

The Phaser® 6250 Color Laser Printer is certified to comply with Laser Product Performance Standards set by the U.S. Department of Health and Human Services as a Class 1 Laser Product. This means that this is a class of laser product that does not emit hazardous laser radiation; this is possible only because the laser beam is totally enclosed during all modes of customer operation. When servicing the printer or laser unit, follow the procedures specified in this manual and there will be no hazards from the laser.

viii Phaser 6250 Color Printer

Servicing Electrical Components

Warning

Before starting any service procedure, switch off the printer power and unplug the power cord from the wall outlet. If you must service the printer with power applied, be aware of the potential for electrical shock.

Turning the power off by using the On/Off switch does not completely deenergize the printer. You must also disconnect the printer power cord from the AC outlet. Position the power cord so that it is easily accessible during servicing.

Do not touch any electrical component unless you are instructed to do so by a service procedure.

S7300-0

Servicing Mechanical Components

When servicing mechanical components within the printer, manually rotate drive assemblies, rollers, and gears.

Do not try to manually rotate or manually stop the drive assemblies while any printer motor is running.

S7300-0

Servicing Fuser Components

This printer uses heat to fuse the toner image to media. The Fuser Assembly is VERY HOT. Turn the printer power off and wait at least 5 minutes for the Fuser to cool before you attempt to service the Fuser Assembly or adjacent components.

Service Manual ix

Regulatory Specifications

Federal Communications Compliance

The equipment described in this manual generates and uses radio frequency energy. If it is not installed properly in strict accordance with Xerox instructions, it m ay cause interference with radio and television reception or may not function properly due to interference from another device. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

■ Reorient or relocate the receiver (device being interfered with).

■ Increase the separation between the printer and the receiver.

■ Connect the printer into an outlet on a circuit different from that which the

receiver is connected.

■ Route the interface cables on the printer away from the receiver

■ Consult the dealer, Xerox service, or an experienced radio/television

technician for help.

Changes or modifications not expressly approved by Xerox can affect the emission and immunity compliance and could void the user's authority to operate this product. To ensure compliance, use shielded interface cables. A shielded parallel cable can be purchased directly from Xerox at www.xerox.com/office/6250supplies

Xerox has tested this product to internationally accepted electromagnetic emission and immunity standards. These standards are designed to mitigate interference caused or received by this product in a normal office environment. This product is also suitable for use in a residential environment based on the levels tested.

In the United States this product complies with the requirements of an unintentional radiator in part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference; (2) this device must accept any interference received, including interference that may cause undesired operation.

This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications, ICES-003.

Le présent appareil numérique n'émet pas de bruits radioélectrique dépassant les limits applicables aux appareils numériques de la classe B prescrites dans le Réglement sur le brouillage radioélectrique édicté par le ministere des Communications du Canada, NMB-003.

x Phaser 6250 Color Printer

Declaration of Conformity

Xerox Corporation, declares, under our sole responsibility that the printer to which this declaration relates, is in conformity with the following standards and other normative documents:

In the European Union

following the provisions of the Low Voltage Directive 73/23/EEC and its amendments:

EN 60950 (IEC 950)

"Safety of Information Technology Equipment including Electrical Business Equipment"

following the provisions of the Electromagnetic Compatibility Directive 89/336/EEC and its amendments:

EN55022:1998 (CISPR 22)

EN61000-3-2:1995 +A1:1998+A2:1998 (IEC61000-3-2)

EN61000-3-3:1995 (IEC61000-3-3)

EN55024:1998 (CISPR 24)

CISPR 24 Immunity Phenomena Basic Standard Test Specification

Electrostatic Discharge IEC61000-4-2:1995 6kV Contact, 10kV Air Radio-Frequency

Electromagnetic Field (radiated)

Fast Burst Transients IEC61000-4-4:1995 5/50 Tr/Th ns, 5kHz Rep. Freq

Line Surge IEC61000-4-5:1995 Combination wave

Radio-Frequency Electromagnetic Field (Conducted)

Line voltage dips IEC61000-4-11:1994 >95% dip for ½ cycle @ 50 Hz

"Limits and Methods of measurement of radio interference characteristics of Information Technology Equipment." Class B.

“Part 3: Limits - Section 2: Limits for harmonic current emissions (equipment input current less than or equal to 16A per phase).”

“Part 3: Limits - Section 3: Limitation of voltage fluctuations and flicker in low-voltage supply systems for equipment with rated current less than or equal to 16A.”

"Information technology equipment - Immunity characteristics - Limits and methods of measurement. "

IEC61000-4-3:1995 80-1000 MHz, 3V/m, 80% AM @ 1KHz

0.5kV on Signal Lines 1kV on AC Mains

2.0kV Common mode

2.0kV Differential mode

IEC61000-4-6:1996 0.15 - 80 MHz, 3V, 80% AM @ 1kHz

30% dip for 25 cycles @ 50 Hz

Service Manual xi

CISPR 24 Immunity Phenomena Basic Standard Test Specification

Line voltage drop-out IEC61000-4-11:1994 >95% dropout for 250 cycles @ 50 Hz

This product, if used properly in accordance with the user's instructions is neither dangerous for the consumer nor for the environment. A signed copy of the Declaration of Conformity for this product can be obtained from Xerox.

xii Phaser 6250 Color Printer

Contents

Service Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iv

Symbols Marked on the Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v

Power Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi

Electrostatic Discharge (ESD) Precautions . . . . . . . . . . . . . . . . . . . . . . . . vii

Service Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii

Regulatory Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .x

1 General Information

Printer Introduction and Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Printer Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Printer Memory and RAM Capabilities . . . . . . . . . . . . . . . . . . . . . 1-4

Parts of the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Exterior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Phaser 6250 Front Panel Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Image Processor Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Routine Maintenance Items. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Consumables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Consumable Life Counter Behavior . . . . . . . . . . . . . . . . . . . . . . 1-10

Printer Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Physical Dimensions and Clearances. . . . . . . . . . . . . . . . . . . . . 1-11

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Environmental Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Media and Tray Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

2 Theory of Operation

Overview of the Phaser 6250 Color Laser Printer Theory of Operation . . 2-2

Summary of the Printing Process . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Print Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Printer Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Paper Size Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Selective Control; Paper Pick . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Laser Light Intensity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Process Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

LED Light Density CTD (ADC) Control of Sensor . . . . . . . . . . . . . 2-8

Color Registration Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Transfer Roller Assembly Control. . . . . . . . . . . . . . . . . . . . . . . . 2-11

Toner Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Fuser Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Paper Path of the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Paper Path Route. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Service Manual xiii

Major Assemblies and Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Frame and Drive Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Main Drive Assembly - Transmission Route . . . . . . . . . . . . . . . 2-17

Gear Layout - Print Engine and Tray 1. . . . . . . . . . . . . . . . . . . . 2-18

Paper Tray 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Paper Feed - Tray 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

HCF Drive and Gears - Transmission Route. . . . . . . . . . . . . . . . 2-25

500-Sheet Feeder Drive and Gears - Transmission Route . . . . . 2-26

Retard Housing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

Chute Assembly In. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

Chute Assembly Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

Chute Assembly Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30

Duplex Motor Drive and Gear - Transmission Route . . . . . . . . . 2-31

Chute Assembly Registration (REGI). . . . . . . . . . . . . . . . . . . . . 2-32

Transfer Roller and Fuser Assembly . . . . . . . . . . . . . . . . . . . . . 2-33

Fuser Drive Assembly - Transmission Route. . . . . . . . . . . . . . . 2-34

Xerographics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

Imaging Unit Charge Voltage Contacts . . . . . . . . . . . . . . . . . . . 2-36

Toner Cartridge Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38

Toner Cartridge Assembly - cont’d . . . . . . . . . . . . . . . . . . . . . . 2-39

Toner Motor Drive Assembly - Transmission Route . . . . . . . . . 2-40

Developer Assembly Transmission Route . . . . . . . . . . . . . . . . . 2-40

3 Error Messages and Codes

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Servicing Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Using the Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . 3-4

General Notes on Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . 3-4

Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Service Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Service Diagnostic Front Panel Button Descriptions . . . . . . . . . . 3-7

Diagnostic Menu Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Service Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Jam History Error Codes Table . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Error Messages and Codes Summary Table . . . . . . . . . . . . . . . 3-17

Jam Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Jam at Fuser: Jam F. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Jam at Duplex: Jam D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

Jam at Registration Roller: Jam RR. . . . . . . . . . . . . . . . . . . . . . 3-23

Misfeed at Tray 1 (MPT): Jam T1. . . . . . . . . . . . . . . . . . . . . . . . 3-25

Misfeed at Tray 2: Jam T2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28

Misfeed at Tray 3: Jam T3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31

Misfeed at Tray 4: Jam T4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34

Door and Cover Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

Close Front Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

Consumable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

xiv Phaser 6250 Color Printer

Install or Reseat Imaging Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

Replace Imaging Unit or

Imaging Unit is Near End of Life. . . . . . . . . . . . . . . . . . . . . . 3-38

Install or Reseat Transfer Roller. . . . . . . . . . . . . . . . . . . . . . . . . 3-39

Replace Transfer Roller or

Transfer Roller is at End of Life . . . . . . . . . . . . . . . . . . . . . . 3-40

Install or Reseat Fuser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-41

Replace Fuser or Fuser is Near End of Life. . . . . . . . . . . . . . . . . 3-42

Install or Lock [Y] [M] [C] [K] Toner Cartridge . . . . . . . . . . . . . 3-43

Replace [Y] [M] [C] [K]Toner Cartridge or

[Y] [M] [C] [K] Toner Is Low . . . . . . . . . . . . . . . . . . . . . . . . 3-45

Dusty Density Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-47

Output Tray is Full, Unload Paper. . . . . . . . . . . . . . . . . . . . . . . . 3-48

Remove Ribbon from [Y] [M] [C] [K] Toner Cartridge. . . . . . . . 3-49

Tray and Media Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50

Insert Tray [2] or Tray [2] Missing. . . . . . . . . . . . . . . . . . . . . . . 3-50

Insert Tray [3] [4] or Tray [3] [4] Missing . . . . . . . . . . . . . . . . . 3-52

Tray 2 Paper is Low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54

Tray [3] [4] Paper is Low. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55

Out of Paper; Load Tray 1 (MPT) with [size] [type] . . . . . . . . . . 3-56

Out of Paper; Load Tray [2] [3] [4] with [size] [type]. . . . . . . . . 3-57

Wrong Paper Size; Load Tray 2 with [size] [type] . . . . . . . . . . . 3-58

Wrong Paper Size; Load Tray [3] [4] with [size] [type] . . . . . . . 3-60

Wrong Paper Type; Load Tray [1 (MPT)] [2] [3] [4]

with [size] [type] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62

Fatal Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-63

Laser Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-63

Density Sensor Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-64

Fuser Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-65

Fuser Failure (cont’d). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-66

Fuser Failure (cont’d). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-67

Fuser Fan Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-68

Rear Fan Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-69

Generic Fan Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-70

Engine Firmware Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-71

Imaging Unit Firmware Failure. . . . . . . . . . . . . . . . . . . . . . . . . . 3-72

Fuser Firmware Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-73

Controller to Engine Communications Failure . . . . . . . . . . . . . . 3-74

Engine NVRAM Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-75

Replace [Y] [M] [C] [K] Toner Cartridge . . . . . . . . . . . . . . . . . . 3-76

[Y] [M] [C] [K] Toner Cartridge Failure . . . . . . . . . . . . . . . . . . . 3-77

Non-Phaser 6250 Fuser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-78

Non-Phaser 6250 Imaging Unit . . . . . . . . . . . . . . . . . . . . . . . . . 3-79

Environmental Sensor Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-80

Service Manual xv

4 General Troubleshooting

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Printer Status Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Power-Up Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

System Start-Up and POST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

System Boot Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Power On Self Test (POST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

POST Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

LED Blink Patterns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

POST Diagnostic Test Descriptions . . . . . . . . . . . . . . . . . . . . . . . 4-7

Front Panel Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

No Front Panel Display after Power is Turned ON . . . . . . . . . . . . 4-8

Front Panel LED is on, Front Panel Display is Blank. . . . . . . . . . . 4-8

Front Panel Continually Displays “Warming Up...”. . . . . . . . . . . . 4-8

Front Panel Continually Displays "Install or Reseat Imaging Unit" 4-8

Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Inoperable Printer Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Engine Power-Up Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Printer Does Not Come to a "Ready" State . . . . . . . . . . . . . . . . . . 4-9

Paper Size Switch Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

AC Power Supply Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

DC Power Supply Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Media Jams and the Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Operating System and Application Problems . . . . . . . . . . . . . . . . . . . . 4-17

Macintosh printing problems. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

Windows printing problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

Network Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

5 Print-Quality Troubleshooting

Print-Quality Problems Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Defects Associated with Specific Printer Components. . . . . . . . . 5-3

Front Panel Test Prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Test Print 1: CMYK Sample Page. . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Test Print 2: RGB Test Print. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Service Test Prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Test Print 3: Test Pattern Sample . . . . . . . . . . . . . . . . . . . . . . . . 5-6

600 x 600 Service Test Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Print Engine Test Print. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

Print-Quality Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Light Prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Light Print in Only One Color. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

Blank Prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

Black Prints with White Margin Border . . . . . . . . . . . . . . . . . . . 5-14

Solid Dark or Dirty Prints, No Border. . . . . . . . . . . . . . . . . . . . . 5-15

xvi Phaser 6250 Color Printer

Missing Band, Voids Or Streaks In a Single Color

or All Colors Parallel to the Leading Edge. . . . . . . . . . . . . . . 5-16

Missing Band, Voids or Streaks in a Single Color

or All Colors in Direction of Paper Travel . . . . . . . . . . . . . . . 5-18

Repeating and/or Random Spots . . . . . . . . . . . . . . . . . . . . . . . . 5-19

Background Contamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

Residual Image, Ghosting or Hot Offset. . . . . . . . . . . . . . . . . . . 5-22

Incomplete Fusing or Cold Offset. . . . . . . . . . . . . . . . . . . . . . . . 5-23

Mis-Registration, Color Layer not Correctly Registered

in the Process Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

Dirty Vertical Streaks on the Edges of the Page . . . . . . . . . . . . . 5-25

6 Adjustments and Calibrations

Calibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Color Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Margin Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Horizontal and Vertical Color Registration . . . . . . . . . . . . . . . . . . 6-3

Resetting NVRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

PostScript NVRAM Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Service Diagnostics PostScript NVRAM Resets. . . . . . . . . . . . . . . . . . . . 6-8

7 Cleaning and Maintenance

Service Preventive Maintenance Procedure. . . . . . . . . . . . . . . . . . . . . . . 7-2

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

8 Service Part Disassembly

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Standard Orientation of the Printer. . . . . . . . . . . . . . . . . . . . . . . . 8-2

General Notes on Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

Notations in the Disassembly Text. . . . . . . . . . . . . . . . . . . . . . . . 8-3

Removing Routine Maintenance Items and Consumables. . . . . . . . . . . . 8-4

Transfer Roller Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

Imaging Unit Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

Fuser Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

Toner Cartridge Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

Print Engine Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6

Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6

Front Cover (PL 1.1.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6

Front Panel (PL 1.1.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7

Fuser Fan (PL 1.1.7). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8

Top Main Cover (PL1.1.9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9

Image Unit Top Cover (Door C) (PL1.1.10) . . . . . . . . . . . . . . . . 8-10

Right and Left Side Covers (PL1.1.24), (PL1.1.30) . . . . . . . . . . 8-11

Service Manual xvii

Rear Cover (PL 1.1.20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12

Left and Right Links (PL 1.1.23) . . . . . . . . . . . . . . . . . . . . . . . . 8-13

Tray 1 (MPT) (PL1.1.99) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14

Front Right Cover (PL 1.1.25) . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15

Front Left Cover Assembly (PL1.1.29). . . . . . . . . . . . . . . . . . . . 8-16

Paper Feed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-18

Paper Feed Roller (PL 2.1.2) (Routine Maintenance Item). . . . . 8-18

Turn Chute Assembly (PL3.1.2). . . . . . . . . . . . . . . . . . . . . . . . . 8-19

Printer Chassis/Feeder Assembly. . . . . . . . . . . . . . . . . . . . . . . . 8-20

Paper Pick Assembly (PL3.3.1) . . . . . . . . . . . . . . . . . . . . . . . . . 8-22

Right and Left Housing (PL 3.2) . . . . . . . . . . . . . . . . . . . . . . . . 8-23

Temperature/Humidity Harness (PL3.2.1) and Sensor (PL3.2.2) 8-24

High-Capacity Feeder Harness (PL3.2.3). . . . . . . . . . . . . . . . . . 8-25

Paper Size Switch Assembly (PL3.2.4) . . . . . . . . . . . . . . . . . . . 8-26

Low Paper Lever (PL3.2.7), Indicator (PL3.2.8) and

Indicator Guide (PL3.2.10). . . . . . . . . . . . . . . . . . . . . . . . . . 8-27

Paper Pick Rollers (PL3.3.3) . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-29

No Paper Actuator (PL3.3.5), No/Low Paper Sensor (PL3.3.4) . 8-30

Link Actuator (PL3.3.6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-32

Feed Solenoid (PL3.3.17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-33

Turn Clutch Assembly (PL3.3.18) . . . . . . . . . . . . . . . . . . . . . . . 8-34

Roll Turn Assembly (PL3.3.20) . . . . . . . . . . . . . . . . . . . . . . . . . 8-35

Paper Feed Roller (Routine Maintenance Item) . . . . . . . . . . . . . 8-36

Retard Roller Housing Assembly (PL4.1.1). . . . . . . . . . . . . . . . 8-37

Turn Roll (PL 4.1.2), Turn Clutch (PL 4.1.9),

and Friction Clutch Assembly (PL 4.1.4) . . . . . . . . . . . . . . . 8-38

Retard Roller Assembly (PL4.1.5) . . . . . . . . . . . . . . . . . . . . . . . 8-39

Chute Assembly In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-41

Chute Assembly In (PL 5.1.1) . . . . . . . . . . . . . . . . . . . . . . . . . . 8-41

CTD (ADC) Sensor (PL 5.1.11) . . . . . . . . . . . . . . . . . . . . . . . . . 8-42

Toner Full Sensor (PL 5.1.13) . . . . . . . . . . . . . . . . . . . . . . . . . . 8-43

Fuser Drive Assembly (PL 5.1.18) . . . . . . . . . . . . . . . . . . . . . . . 8-44

Right Latch (Door A) (PL 5.1.21). . . . . . . . . . . . . . . . . . . . . . . . 8-45

Left Latch (PL 5.1.30) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-46

Chute Assembly Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-47

Chute Assembly Out (PL6.1.1). . . . . . . . . . . . . . . . . . . . . . . . . . 8-47

Output Tray Full Actuator (PL 6.1.5) and

Full Stack Sensor (PL 6.1.4). . . . . . . . . . . . . . . . . . . . . . . . . 8-50

Duplex Actuator (PL 6.1.13) and Duplex Sensor (PL 6.1.4). . . . 8-51

Tray 1 Actuator (PL 6.1.37) and Tray 1 Sensor (PL 6.1.4). . . . . 8-53

Static Eliminator Assembly (PL 6.1.9). . . . . . . . . . . . . . . . . . . . 8-55

Duplex Roller (PL 6.1.12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-56

Latch Plate (PL 6.1.17), Latch Out (PL 6.1.18),

Latch Holder (PL 6.1.19), and Latch Spring Out (PL 6.1.20) 8-57

Tray 1 Paper Pick Assembly (PL 6.1.27) (Roll Feed). . . . . . . . . 8-58

Tray 1 Feed Solenoid (PL 6.1.40). . . . . . . . . . . . . . . . . . . . . . . . 8-59

xviii Phaser 6250 Color Printer

Tray 1 Shaft (PL 6.1.28). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-60

Tray 1 Bottom Plate (PL 6.1.42). . . . . . . . . . . . . . . . . . . . . . . . . 8-61

Chute Assembly Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-62

Chute Assembly Exit (PL 7.1.1) . . . . . . . . . . . . . . . . . . . . . . . . . 8-62

Exit Roller (PL 7.1.4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-63

Mid Roller (PL 7.1.5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-64

Duplex Motor Assembly (PL 7.1.8) . . . . . . . . . . . . . . . . . . . . . . 8-65

Exit Actuator (Fuser) (PL 8.1.7) . . . . . . . . . . . . . . . . . . . . . . . . . 8-66

Strap (PL 8.1.13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-67

Xerographics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-68

Laser Unit (PL 9.1.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-68

Housing Assembly Bias (PL 9.1.4). . . . . . . . . . . . . . . . . . . . . . . 8-69

Chute Assembly Registration (PL 9.1.6) and

Housing Assembly Electric (PL 9.1.11) . . . . . . . . . . . . . . . . 8-71

Registration Sensor Actuator (PL 9.1.9) and

Registration Sensor (PL 9.1.8). . . . . . . . . . . . . . . . . . . . . . . 8-73

OHP Sensor and Harness (Kit) (PL 9.1.12) . . . . . . . . . . . . . . . . 8-75

Toner Cartridge Holder Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-77

Toner Cartridge Holder Unit Assembly (PL 10.1). . . . . . . . . . . . 8-77

Toner Cartridge Holder Assembly. . . . . . . . . . . . . . . . . . . . . . . . 8-80

Toner Present Switch Bracket and Actuator

(PL 10.1.6 and 10.1.22). . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-82

Toner Low Sensor (PL 10.1.5). . . . . . . . . . . . . . . . . . . . . . . . . . 8-84

CRUM Reader Box Assembly (PL 10.1.21) . . . . . . . . . . . . . . . . 8-85

EEPROM Board (PL 10.1.14). . . . . . . . . . . . . . . . . . . . . . . . . . . 8-86

Sub-High Voltage Power Supply Board (PL 10.1.15). . . . . . . . . 8-87

Frame and Drive Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-88

Left Lever Plate (PL 11.1.1), Lever Bracket (PL 11.1.2),

Lever Link (PL 11.1.3), Lever Drum (PL 11.1.4), and

Lever Spring (PL 11.1.5) . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-88

Lever Plate Right (PL 11.1.7), Lever Bracket (PL 11.1.2),

Lever Link (PL 11.1.6), Lever Drum (PL 11.1.4), and

Lever Spring (PL 11.1.5) . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-91

Main Drive Assembly (PL 11.1.14). . . . . . . . . . . . . . . . . . . . . . . 8-94

Developer Drive Assembly (PL 11.1.13). . . . . . . . . . . . . . . . . . . 8-95

Actuator, I/L (PL 11.1.8) and Spring, I/L (PL 11.1.9). . . . . . . . . 8-96

Earth Ground Circuit Board (PL 11.1.16) . . . . . . . . . . . . . . . . . . 8-97

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-98

AC Switch Harness Assembly (PL 12.1.11) . . . . . . . . . . . . . . . . 8-98

Low-Voltage Power Supply (PL 12.1.10) . . . . . . . . . . . . . . . . . . 8-99

Motor Driver Board (PL 12.1.12) . . . . . . . . . . . . . . . . . . . . . . . 8-101

Rear Fan (PL 12.1.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-102

Card Cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-103

Housing Assembly Contact (PL 12.1.14) . . . . . . . . . . . . . . . . . 8-106

Engine Control Circuit Board (PL12.1.1) . . . . . . . . . . . . . . . . . 8-107

Image Processor Board (PL12.1.4) . . . . . . . . . . . . . . . . . . . . . 8-110

Service Manual xix

Optional High Capacity Feeder Disassembly . . . . . . . . . . . . . . . . . . . . 8-111

Cover Front (PL14.2.4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-111

Cover, Right (PL14.2.1) and Cover, Left (PL14.2.3) . . . . . . . . 8-112

Turn Chute Assembly (PL14.3.7) . . . . . . . . . . . . . . . . . . . . . . . 8-113

Tray 3 Harness Assembly (PL14.5.3), Tray 4 Harness Assembly

(PL14.5.4), and HCF Plug Harness Assembly (PL14.5.2) . 8-114

Circuit Board, HCF (PL14.5.1) . . . . . . . . . . . . . . . . . . . . . . . . . 8-116

Drive Feeder Assembly (PL14.5.5). . . . . . . . . . . . . . . . . . . . . . 8-117

Indicator Assembly (PL14.5.9) . . . . . . . . . . . . . . . . . . . . . . . . 8-118

Right Tray Guide (PL14.3.5)and Low Paper Lever (PL 14.5.8) 8-119

Left Tray Guide (PL14.3.3). . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-122

Link Actuator (PL 14.4.6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-124

HCF Paper Pick Assembly (PL14.4.1) . . . . . . . . . . . . . . . . . . . 8-125

Idler Gear (PL14.5.6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-126

No Paper, Low Paper Sensor (PL14.5.7). . . . . . . . . . . . . . . . . 8-127

Paper Size Switch Assembly (PL14.3.6) . . . . . . . . . . . . . . . . . 8-128

Casters, Locking (PL 14.2.5)/Non-Locking (PL 14.2.6) . . . . . . 8-129

Optional 500-sheet Feeder Disassembly . . . . . . . . . . . . . . . . . . . . . . . 8-130

Cover Front (PL15.2.4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-130

Cover, Right (PL15.2.2) and Cover, Left (PL15.2.1) . . . . . . . . 8-131

Turn Chute Assembly (PL15.3.9) . . . . . . . . . . . . . . . . . . . . . . . 8-132

Tray 3 Harness Assembly (PL15.5.3) and

STF Plug Harness Assembly (PL15.5.2). . . . . . . . . . . . . . . 8-133

Circuit Board, STF (PL15.5.1) . . . . . . . . . . . . . . . . . . . . . . . . . 8-135

Drive Feeder Assembly (PL15.5.5). . . . . . . . . . . . . . . . . . . . . . 8-136

Indicator Assembly (PL15.5.8) . . . . . . . . . . . . . . . . . . . . . . . . 8-137

Right Tray Guide (PL15.3.5)and Low Paper Lever (PL 15.5.7) 8-138

Left Tray Guide (PL15.3.3). . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-141

Link Actuator (PL 15.4.6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-143

STF Paper Pick Assembly (PL15.4.1) . . . . . . . . . . . . . . . . . . . 8-144

No Paper, Low Paper Sensor (PL15.5.6). . . . . . . . . . . . . . . . . 8-145

Paper Size Switch Assembly (PL15.3.6) . . . . . . . . . . . . . . . . . 8-146

9 Parts List

Serial Number Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2

Using the Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

Print Engine Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4

PL 1.1 Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4

PL 2.1 Universal Paper Tray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7

PL 3.1 Paper Feed I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8

PL 3.2 Paper Feed II. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10

PL 3.3 Paper Feed III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12

PL 4.1 Housing Assembly Retard . . . . . . . . . . . . . . . . . . . . . . . 9-14

PL 5.1 Chute Assembly In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-16

PL 6.1 Chute Assembly Out. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-18

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-21

xx Phaser 6250 Color Printer

PL 7.1 Chute Assembly Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-22

PL 8.1 Transfer Roller & Fuser Assembly (RMIs) . . . . . . . . . . . 9-24

PL 9.1 Xerographics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-26

PL 10.1 Holder Toner Cartridge Assembly . . . . . . . . . . . . . . . . . 9-28

PL 11.1 Frame and Drive Assemblies. . . . . . . . . . . . . . . . . . . . . 9-30

PL 12.1 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-32

PL 13.1 Harness Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-34

Optional High-Capacity Feeder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-36

PL 14.1 Paper Trays 3 & 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-36

PL 14.2 High-Capacity Feeder Covers . . . . . . . . . . . . . . . . . . . . 9-37

PL 14.3 High-Capacity Feeder Guides and

Turn Chute Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-38

PL 14.4 Paper Pick Assembly Trays 3 & 4. . . . . . . . . . . . . . . . . 9-40

PL 14.5 High-Capacity Feeder Harness, Board and Motor . . . . . 9-42

Optional 500-sheet Feeder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-44

PL 15.1 Paper Tray 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-44

PL 15.2 500-sheet Feeder Covers. . . . . . . . . . . . . . . . . . . . . . . . 9-45

PL 15.3 500-sheet Feeder Guides and Turn Chute Assembly. . . 9-46

PL 15.4 Paper Pick Assembly Tray 3 . . . . . . . . . . . . . . . . . . . . . 9-48

PL 15.5 500-sheet Feeder Harness, Board and Motor . . . . . . . . 9-50

Xerox Supplies and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-51

10 Wiring Diagrams

Plug/Jack Locator Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2

Map 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6

Map 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7

Map 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8

Map 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9

High-Capacity Feeder Plug/Jack Locator Table . . . . . . . . . . . . . . . . . . 10-10

Map 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11

500-sheet Feeder Plug/Jack Locator Table . . . . . . . . . . . . . . . . . . . . . 10-12

Map 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13

Print Engine Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14

Notations used in Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . 10-14

Main Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15

Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16

Paper Tray 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17

Drive Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18

Developer Section 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19

Developer Section 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20

Fuser Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-21

Laser Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22

Xerographics 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23

Xerographics 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24

Paper Feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25

Image Processor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-26

Service Manual xxi

Printer Options Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-27

High Capacity Feeder Main Wiring Diagram. . . . . . . . . . . . . . . 10-27

Drive Section (HCF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-28

Paper Tray 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-29

Paper Tray 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-30

500-sheet Feeder Main Wiring Diagram. . . . . . . . . . . . . . . . . . 10-31

Drive Section (STF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-32

Paper Tray 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-33

A Appendix

Printer Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Index

xxii Phaser 6250 Color Printer

General Information

In this chapter...

■ Printer Introduction and Overview

■ Printer Configurations

■ Parts of the Printer

■ Phaser 6250 Front Panel Configuration

■ Image Processor Board

■ Routine Maintenance Items

■ Printer Specifications

Chapter

Printer Introduction and Overview

The Xerox Phaser® 6250 Color Laser Printer Service Manual is the primary document used for repairing, maintaining, and troubleshooting the printer.

T o ensure complete understanding of this product, participation in Xerox Phaser 6250 Service Training is strongly recommended.

Phaser 6250 Color Laser Printer shown with the Optional HighCapacity Feeder

[

MPT

]

6250-01

Printer Configurations

The Phaser 6250 Printer combines a single-pass, tandem color laser design, with an image processor supporting PostScript 3 and PCL5c page description languages. The printer is a high performance, A4, 26 page per minute (ppm) desktop color laser printer supporting resolutions up to 2400 x 600 dots-per-inch (dpi).

The Phaser 6250 comes in five configurations. The main differences are optional networking, standard memory, optional high-capacity feeder, duplexing (2-sided printing) capabilities, and optional internal hard drive.

1-2 Phaser 6250 Color Laser Printer Service Manual

A replaceable “Configuration Chip” holds configuration information that enables or disables built-in features as described below.

Printer Configuration

Features

6250B 6250N 6250DP 6250DT 6250DX

Max Print Speed 26 26 26 26 26 Memory (Mbytes) 128 256 256 512 512 PostScript Fonts 137 137 137 137 137 PCL Fonts 81 81 81 81 81 Embedded PCL Yes Yes Yes Yes Yes Job Pipelining No Yes Yes Yes Yes Secure, Proof, and Saved

Print Jobs PDF 1.4 support No Opt* Opt* Opt* Yes Banner-Size printing No Opt* Opt* Yes Yes Default Resolutions (dpi) 2400x600 2400x600 2400x600 2400x600 2400x600 Photo Mode No Yes Yes Yes Yes Job Collation No Opt* Opt* Opt* Yes Auto-Duplex No No Yes Yes Ye s Single Tray, 500-Sheet

Feeder Tray 3

1000-Sheet High-Capacity Feeder Trays 3 & 4

Ethernet capabilities Opt Yes Yes Ye s Yes USB, Parallel Yes Yes Yes Yes Yes Hard Drive Opt** Opt Opt Opt Yes

* Requires optional hard drive ** Hard drive will work but does require N upgrade to support storage features *** 500-Sheet Feeder is not stackable

No Opt* Opt* Opt* Yes

Opt Opt Opt Yes*** No

Opt Opt Opt Opt Yes

General Information 1-3

Printer Memory and RAM Capabilities

The printer features two slots that accept 64, 128, and 256 Mbytes of SDRAM. All combinations are allowed for 64, 128, 256, 320, 384, and 512 Mbytes. Memory modules must have the following characteristics:

■ PC133 DRAM Standard

■ 144 Pin SODIMM

■ Serial Presence Detect

■ 3.3 Volt

The startup Page and the Configuration Page list the amount of RAM installed in the Printer.

If the memory does not meet the above specifications, it will be ignored by the printer.

1-4 Phaser 6250 Color Laser Printer Service Manual

Parts of the Printer

Exterior

6250-021

1. Top Cover (Output Tray) 6. High-Capacity Feeder with Tray 3 and Tray 4

2. Control Panel (Front Panel) 7. Door Latch B

3. Front Cover 8. Door Latch A

4. Tray 1 (Multi-Purpose Tray) 9. Power On/Off Switch

5. Tray 2 (Universal Paper Tray)

General Information 1-5

Phaser 6250 Front Panel Configuration

The Front Panel contains one tricolor LED, a display window and six function buttons. These buttons navigate the menu system shown in the display window, perform various functions, and select modes of operation for the printer.

LED Indicators:

■ Green = Ready to Print or

Printing

■ Flashing Yellow = Warning ■ Flashing Red = Error

■ Flashing Green = Receiving, Processing Data,

Printing or Power Saver Mode

Front Panel Button Descriptions

Phaser 6250

12 4678

LED (Power/Status)

Graphic front panel display

Cancel Button

Back Button

Up Arrow Button - scrolls up the menu system

Down Arrow Button - scrolls down the menu

system OK (select) Button

Information Button - for additional explanation

or help

6250-0

Front Panel Shortcuts

Mode Press this selection at Power On

Skip execution of POST diagnostics OK Print Service Diagnostics Map INFO Reset PostScript NVRAM BACK+OK Password Bypass UP+DOWN Enter Service Diagnostics BACK+INFO

1-6 Phaser 6250 Color Laser Printer Service Manual

Rear View

6250-01

1. Top Cover 5. Paper Tray Rear Cover

2. Toner Cartidges 6. USB Connector

3. AC Power Connector 7. Ethernet 10BaseT and 100Tx

Connector

4. Image Processor Board 8. IEEE 1284 Parallel Connector

Rear Panel Configuration Interfaces

■ IEEE 1284 Parallel

■ Ethernet 10BaseT and 100Tx

■ USB

General Information 1-7

Image Processor Board

The components identified in the following figure need to be transferred from the old board to the new board when installing a new Image Processor Board in the printer. Data stored in the NVRAM can be transferred to the new board using the MCU NVRAM Store/Restore functions instead of by moving the component. Detailed information on the Store/Restore functions is available in "Service Diagnostic Tests" on page 3-9.

pin 1

1234

1. Hard Drive (available option) 3. NVRAM

2. Configuration Chip 4. Memory (RAM) DIMM 1 and DIMM 2

(available option)

6250-02

1-8 Phaser 6250 Color Laser Printer Service Manual

Routine Maintenance Items

A printer part or assembly that has a limited life, and requires periodic replacement.

1. Transfer Roller 3. Fuser Assembly

2. Imaging Unit

6250-0

Consumables

Consumables consist of the four toner cartridges used in the printer.

6250-4

General Information 1-9

Consumable Life Counter Behavior

Internal counters track Consumables and Routine Maintenance Items life usage and store the values in NVRAM. The image processor board monitors these counters in order to display the near end-of-life and end-of-use messages.

Life ratings are based on A-size sheets at 5% coverage. Imaging Unit life ratings are based on average 4 page job length.

Consumables Print Life

Toner Cartridges

High-Capacity Standard Capacity

Routine Maintenance Items

Imaging Unit 30,000 Fuser Assembly 100,000 Transfer Roller and Waste Box 15,000 Feed Roller Kit* up to 100,000

* No life tracking for this item

8,000 4,000

1-10 Phaser 6250 Color Laser Printer Service Manual

Printer Specifications

Physical Dimensions and Clearances

Print Engine Dimensions Value

Height: 445 mm (17.52 in.) Width: 439 cm (17.28 in.) Depth: 638 mm (25.12 in.) Weight: Approximately 36.5 kg (80.5 lb.) Print engine

Optional High-Capacity Feeder Dimensions Value

Height: 336 mm (13.23 in.) Optional Paper Tray Assembly Width: 439 cm (17.28 in.) Depth: 563 cm (22.17 in.) Weight: Approximately 15 kg (33 lb.) no Paper Tray(s) installed

Optional 500-sheet Feeder Dimensions Value

Approximately 56.5 kg (124.5 lb.) with Paper Tray(s) installed

Approximately 20 kg (44 lb.) with Paper Tray(s) installed

Height: 172 mm (6.77 in.) Optional Paper Tray Assembly Width: 439 cm (17.28 in.) Depth: 563 cm (22.17 in.) Weight: Approximately 7 kg (15.4 lb.) no Paper Tray installed

Approximately 12 kg (26.4 lb.) with Paper Tray installed

Clearance Value

Top: 350 mm (13.78 in.)

Left: 100 mm (3.94 in.)

Right: 150 mm (5.91 in.)

Front: 600 mm (23.62 in.)

Rear: 200 mm (7.87 in.)

Mounting surface level tolerance:

Within 3 degrees of horizontal with all four feet in contact with the surface.

General Information 1-11

Functional Specifications

Characteristic Specification

Printing process Imaging System - 4-tandem drums, electro-photographic system

Color medium Yellow, Magenta, Cyan, and Black Toner Cartridges Resolution /

Addressability

Operating Modes Print Mode: Print Engine capable of making prints immediately.

Continuuous Operating Printing Speed

ppm = pages per minute ipm = inches per minute

using intermediate drum transfer rolls (IDTs). Exposure System - Semiconductor laser, simultaneous scanning by 4 beams.

Development System - Dry type 2-component developer. Fusing System - Heat fusing, free nip-belt system.

Draft 600 x 600 dpi Enhanced 2400 x 600 dpi (Default) Photo 2400 x 600 dpi* * Not available on the Phaser 6250B.

Ready Mode: 20 seconds from completion of a print. Sleep/ Low Power/ Power Saver Mode: Entered after a specified

period of Print Engine inactivity since completion of the last print.

Mode Paper Size / wt g/m

600/2400 dpi Letter / A4

65 -130 26/24 ppm 15 ipm 100-163 13/12 ppm 7.8 ipm 160-216 13/12 ppm N/A

600/2400 dpi Legal

65 -130 19 ppm 16 ipm 100-163 10 ppm 7.8 ipm 160-216 10 ppm N/A

Simplex Duplex

600/2400 dpi Envelope/Postcard

160-216 13 ppm N/A

600/2400 dpi Letter / A4 / OHP 8.6/8 ppm

Letter / A4 Photo Glossy Paper 8.6/8 ppm 5 ipm 100-200

Cleaning Cycle interval for continuous printing

Print speed will be reduced if the print job is larger than the cleaning cycle interval.

IU Print Volume Draft Enhanced Photo

Pages Pages Pages

0 - 5 K Pages 53 31 22 5 - 10 K Pages 35 26 18 10 - 15 K Pages 35 26 18 15 - 20 K Pages 35 26 18 20 - 25 K Pages 29 22 13 25 - 30 K Pages 29 22 13 >30 K Pages 29 22 13

1-12 Phaser 6250 Color Laser Printer Service Manual

Functional Specifications (Continued)

Characteristic Specification

First Print-Out (in seconds) (Letter/A4) (printer in Ready state)

Warm-up time 30 seconds from cold start (power off condition)

Mode Tray 1 Tray 2 Tray 3 Tray 4

Simplex, 600 dpi 14.5 15 16.5 18 Duplex, 600 dpi 23 23.5 25 26.5 Simplex, half-speed 23.5 24.5 27.5 30.5 Duplex, half-speed 38.5 39.5 42.5 45.5

Electrical Specifications

Characteristic Specification

Primary line voltages 110-127 V Printer - (90 - 140 V) 13 amp circuit

220-240 V Printer - (198 - 264 V) 7-8 amp circuit

Primary line voltage frequency range

Power consumption at rated voltage input

100-120 V Printer - 50/60 Hz + 3Hz 220-240 V Printer - 50/60 Hz + 3Hz

Mode Condition 100/120 VAC 220/240 VAC Print Mode Max.. 1000 W or less 1000 W or less Ready Mode Fuser On 180 W or less 180 W or less Sleep Mode Fuser Off 45 W or less 45 W or less

Environmental Specifications

Characteristic Specification

Temperature:

Operating Transportation

Storage

24 month maximum 1 month maximum

Humidity

Operating Transportation Storage

Altitude

Operating Transportation

Acoustic Noise

Idle Printing

Optimal print-quality range: 17o to 26o C (62o to 80o F) 10o C to 32o C (50o F to 90o F)

-30o C to +50o C (-22o F to 122o F)

Normal: 0o C to 35o C (32o F to 95o F) Severe: -20o C to 40o C (-4o F to 104o F)

Optimal print-quality range: 35% to 70% 10% - 85% 30% - 85% 5% - 95%

0 - 2,500 meters (8,000 ft.) 0 - 6,092 meters (20,000 ft.)

Printer Only With Feeder Option

35.0db or less 35.0db or less

55.0db or less (Full Speed) 55.0db or less (Full Speed)

52.0db or less (Half Speed) 53.0db or less (Half Speed)

General Information 1-13

Media and Tray Specifications

Specification Trays

Printable Area

Supported Media Sizes

Supported Media Types and Weights

Supported Envelopes*

* Some wrinkling and embossing may occur when printing envelopes.

Minimum margins = 5 mm (0.2 in.) on all sides Maximum paper size = 215.9 mm x 355.6 mm (8.5 in. x 14 in.) Minimum paper size = 88.9 mm x 139.7 mm (3.5 in. x 5.5 in.)

Paper Type

Letter Legal Executive Statement US Folio A4 A5* A6 B5 JIS ISO B5 Custom Size & Banner

Type Weight

Plain Paper 64- 90 g/m2 (17 - 24 lb. Bond) Heavy Plain Paper 85 - 130 g/m2 (22 - 28 lb. Bond) Phaser 25-Series Premium Transparency Film (Only) Thin Card Stock 100 - 163 g/m2 (26 - 60 lb. Cover) Thick Card Stock 160 - 216 g/m2 (59 - 80 lb. Cover) Labels N/A Letterhead 85 - 130 g/m2 (22 - 28 lb. Bond) Glossy Coated Paper** 120 - 163 g/m2 (81 - 110 lb.) Business & Greeting Cards N/A CD/DVD Labels and InsertsN/A Digital Photo Paper 163 g/m2 (60 lb. Cover) Phaser Premium Post- 176 g/m2 (65 lb. Cover) cards Phaser Glossy Trifold 176 g/m2 (65 lb. Cover) Brochures Phaser Weatherproof 100 g/m2 (27 lb. Bond) Paper

Envelopes Weight 20 - 24 lb. Bond Commercial #10 4.12 x 9.5 in Monarch Envelope 3.87 x 7.5 in A7 Envelope 5.25 x 7.25 in Custom DL Envelope 110 x 220 mm C5 Envelope 162 x 229 mm C6 Envelope 114 x 162 mm B5 Envelope 176 x 250 mm Envelopes with hot melt type glue are not supported in this printer. Do not use envelopes with windows or metal clasps.

Size

8.5 x 11 in.

8.5 x 14 in.

7.25 x 10.5 in.

5.5 x 8.5 in.

8.5 x 13 in. 210 x 297 mm 148 x 210 mm 105 x 148 mm 182 x 257 mm 176 x 250 mm

8.5 x 22.86 in.

All Trays

All Trays All Trays All Trays Tray 1 Only All Trays All Trays Tray 1 Only Tray 1 Only All Trays Tray 1 Only Tray 1 Only

All Trays All Trays

Tray 1 & 2 Tray 1 Only Tray 1 Only Tray 1 & 2 All Trays All Trays Tray 1 Only Tray 1 Only Tray 1 Only Tray 1 Only

Tray 1 Only

Tray 1 & 2

Tray 1 Only

1-14 Phaser 6250 Color Laser Printer Service Manual

Note

Specification Trays

Speciality Media

Tray Capacity Universal Tray Tray 1/MPT

Phaser 25-Series Premium Transparencies

Letter 216 x 279 mm 8.5 x 11 in. A4 210 x 297 mm 8.27 x 11.69 in.

Other sizes will be handled through Tray 1 with use of the custom size option. Phaser Premium Postcards

Letter 216 x 279 mm 8.5 x 11 in. A4 210 x 297 mm 8.27 x 11.69 in.

Phaser Glossy Trifold Brochures

Letter 216 x 279 mm 8.5 x 11 in. A4 210 x 297 mm 8.27 x 11.69 in.

Weather Proof Paper

Letter 216 x 279 mm 8.5 x 11 in. A4 210 x 297 mm 8.27 x 11.69 in.

Standard Paper 500 Sheets 100 Sheets Transparency 100 Sheets*** 50 Sheets Envelopes N/A 10 each

* A5 paper is supported from all trays in Japanese models only ** Glossy paper can be used in all trays on the 6250 *** Tray 2 only

Trays 1& 2 Only

Tray 1 Only Tray 1 Only

Trays 1& 2 Only

For duplex configured printers, auto duplex operation is available through Tray 1 (MPT) and Trays 2, 3, and 4. Refer to the Paper Tips page for information on which paper types can be used for duplex printing.

General Information 1-15

Theory of Operation

In this chapter...

■ Overview

■ Printer Controls

■ Paper Path of the Printer

■ Major Assemblies and Functions

Chapter

Overview of the Phaser 6250 Color Laser Printer Theory of Operation

Summary of the Printing Process

The Phaser 6250 Color Laser Printer is a ‘full-color laser printer’, that utilizes electrophotographic recording principals to place a full color image onto the print media. The system, contains a drum and developing unit for each color (yellow, magenta, cyan and black (YMCK)), and places the toner image of each color onto print media producing full-color prints through three transfer units (primary transfer units IDT1 (2 ea) and secondary transfer unit IDT2 (1 ea)).

A summary description of the printing process is presented in the following Steps, see the illustration on the following page as a reference:

1. Charging: The charge roller (RTC) is negatively charged by the high voltage

power supply (HVPS) and is kept in contact with the drum surface to provide a uniform negative charge on the drum as it rotates at a constant speed. This occurs simultaneously for YMCK. The refresher is a conductive brush that is also negatively charged by the HVPS to pick off any toner particles left on the drum after image transfer to the IDT.

2. Exposure: The laser unit emits laser beams in response to image data from the

Image Processor board. The laser beams are directed onto the drum surface through a system of mirrors and lenses. A rotating polygonal mirror causes the laser beams to scan the drum surface from end to end (axially) as it rotates. The beams are turned on to print a pixel and off when no printing is required. The negative char ge on the drum surf ace is reduced at each point where the ener gized laser beam strikes, to form an invisible electrostatic latent image on the drum surface. This process is performed simultaneously for YMCK.

3. Development: Toner is electrostatically attached to the invisible latent image

on the drum surface to form the visible image on the drum. Toner is fed into the developer using the agitator and auger. The toner and the carrier in the developer form a homogeneous layer on the magnet roller in the developer. The magnet roller turns against the surface of the drum and is kept at a constant negative potential. At areas on the drum surface where the negative charge has not been reduced by the impact of laser light, potential between the drum and the toner particles is lower than that between the magnet roller and the toner particles. At areas where the drum charge has been reduced, the potential between the particles and drum is higher than between the magnet roller and toner particles are attracted to the drum. A thin semiconductive sleeve on the magnet roller is vibrated by an AC voltage to encourage migration of the toner particles to the drum. When the toner particles attach to the drum, the negative charge of the particles reduces drum potential at that point, thus reducing the attraction of additional toner particles. This process is performed simultaneously for YMCK.

4. Primary Transfer (drum --> I DT1): The toner image formed on the individual

drum surface is transferred onto the surface of the IDT1 (intermediate Drum Transfer 1: intermediate transfer roller 1). There are two IDT1’s: one for yellow and magenta and one for cyan and black. IDT1 is conductive and receives a high positive charge from the HVPS. The ne gatively charged toner image on the drum

2-2 Phaser 6250 Color Laser Printer Service Manual

surface is attracted by the high positive potential and transfers to IDT1. During this transfer, the remaining negative charge on the drum is neutralized by the high positive charge on IDT1.

5. Secondary Transfer (IDT1 --> IDT2): The toner images formed on both

IDT1 surfaces are then transferred onto the surface of IDT 2 to create a complete, 4-color toner image. IDT2 is also conductive and receives a positive voltage from the HVPS. The received voltage puts IDT2 at a higher potential than IDT1 thus attracting the toner image and facilitating the transfer.

6. Cleaning: The IDT1 cleaner consists of a conductive roller brush rotating in

contact with IDT1 after the point where the toner is transferred to IDT2. The cleaner receives a high positive voltage from the HVPS allowing it to electrically attract any toner particles remaining on IDT1. Toner remaining on both IDT1’s after the image transfer to IDT2 is temporarily stored in the IDT1 cleaners.

7. Tertiary Transfer: The finished toner image on IDT2 is transferred onto the

print media using the voltage supplied by the transfer roller. The conductive transfer roller receives a high positive voltage from the HVPS that puts it at a higher potential than IDT2. Since the transfer roller is located behind the print media, the 4-color toner image is attracted to the high potential and deposits on the surface of the print media.

8. Cleaning: The IDT2 cleaner consists of a conductive roller brush rotating in

contact with IDT2 after the point where the toner is transferred to the print media. The cleaner receives a high positive voltage from the HVPS allowing it to electrically attract any toner particles remaining on IDT2. Toner remaining on IDT 2 after the image transfer to the print media is temporarily stored in the IDT2 cleaner.

9. Static Elimination: The positive charge on the print media can cause image

quality problems by scattering toner. To prevent this, negative DC voltage from the HVPS is applied to the back side of the print media by the Detack Saw, located on the Transfer Roller Assembly. This negative charge neutralizes and eliminates the charge on the print media resulting from the tertiary transfer.

10. Fixing: The finished toner image is unstable and easily smeared. To fix the

image, the print media goes through the Fuser Assembly where it passes between a pressure belt and the heat roller. The toner is fused onto the print media by the combination of heat and pressure.

11. Cleaning: During the general cleaning process, the voltage applied to the IDT

rollers and drums go through a cycle of changes to move the negative and positive charged toner particles from the cleaners and IDTs and then the transfer roller. The toner stored in the IDT1 cleaner, the IDT 2 cleaner and on the transfer roller is removed and deposited into the transfer roller waste recovery bin. Toner from the charge roller and refresher is also removed and deposited into the transfer roller waste recovery bin. In each case the voltage at the point of attraction is set high and the voltage at the point of disposal is set to 0V with the result that the toner is moved to the high potential until at last it is deposited on the transfer roller. Toner is removed from the transfer roller by the attached cleaning blade and deposited in the attached recovery bin.

Theory of Operation 2-3

Drum Y

[

Drum M Drum C Drum K

Charged with

(1)

electricity

Exposure

(2)

Develop-

(3)

ment

Primary transfer

(4)

(Drum → IDT1)

Intermediate

transfer unit

( IDT1)

(5)

Intermediate transfer unit

( IDT2)

Paper

rinting Process Flowchart

[(1) Changing with electricity]

(1) Changing with electricity]

Developer(Y)

[(3) Development]

Drum(M)

Developer(M)

[(3) Development]

[(1) Changing with electricity]

Developer(C)

[(3) Development]

Drum(C)

[(1) Changing with electricity]

Developer(K)

[(3) Development]

Printing Process Components

Charged with

(1)

electricity

(2)

Exposure

Develop-

(3)

ment

Cleaning

(6)

( IDT1)

Secondary transfer ( IDT1

→

IDT2)

(8)

Cleaning ( IDT2)

(7)

Tertiary transfer

( IDT2

→

(9)

Static elimination

(10)

Fixing

RTC

Drum(K)

Paper)

Refresher

(1)

(2)

(3)

Intermediate

transfer unit

( IDT1)

(11)

Refresher

Charged with electricity

Exposure

Development

Primary transfer

(4)

(Drum → IDT1)

Cleaning (general)

Transfer Roller

Drum(Y)

Refresher

IDT1 [(4) Primary transfer] [(5) Secondary transfer]

IDT1 Cleaner [(6) Cleaning

(11) Cleaning]

Charged with

(1)

electricity

(2)

Exposure

Develop-

(3)

ment

Cleaning

(6)

( IDT1)

6250-02

IDT1 Cleaner [(6) Cleaning (11) Cleaning]

IDT2 Cleaner

[(8) Cleaning (11) Cleaning]

IDT2 [(5) Secondary transfe [(7) Tertiary transfer]

6250-02

2-4 Phaser 6250 Color Laser Printer Service Manual

Print Modes

There are three print modes: Draft mode, Enhanced mode, and Photo mode. These are based on the resolution (600 dpi or 2400 dpi) and, depending on the media type, can also be affected by process speed (full speed/half speed/one-third speed).

■ Draft mode: 600 X 600 dpi resolution. Used to check layout. Provides

reduced toner usage.

■ Enhanced mode: 2400 X 600 dpi resolution. General purpose mode for crisp

bright color prints. Recommended for most office use. It is the default mode

■ Photo mode: 2400 X 600 dpi resolution. Highest quality color print with

very smooth color shades. When using photo paper or OHP, gloss is raised by setting the process speed to one-third.

Printer Controls

Paper Size Control

The paper size selection is controlled by three paper size switches located in each paper tray slot. The switch condition is set by moving the paper guide in the tray. This in turn sets the plastic “fingers” on the side of the paper tray to a specific postion that activates the correct switch combination for the selected paper size.

Paper Size Switches are indicated as SW1, SW2, and SW3

Paper Size Switch

Paper Size

SW1 SW2 SW3

LEGAL14" ON ON ON US FOLIO (LEGAL 13)" ON ON OFF EXECUTIVE ON OFF ON B5 ON OFF OFF A4 OFF ON ON A5 (for reference only, supported in Tray 1 [MPT]

only) LETTER OFF OFF ON No Tray OFF OFF OFF

OFF ON OFF

Theory of Operation 2-5

Selective Control; Paper Pick

Unless changed in printer setup, the default tray is Tray 2. Trays in the optional HighCapacity Feeder are identified as Tray 3 and T ray 4. The tray in the optional 500-sheet Feeder is identified as Tray 3.

Laser Light Intensity Control

The Laser Unit in the Phaser 6250 printer has four laser diodes: one each for yellow, magenta, cyan, and black. The diodes control circuits adjust the light intensity for each color automatically. Image data is transmitted to the laser diodes in the Laser Unit as digital signals. The laser diodes convert the image data from digital signals to optical signals. The laser assembly monitors and adjusts the light intensity of the laser beams to attain a stable electrostatic image. Variations in drum sensitivity may prevent the system from obtaining a proper electrostatic image.

Process Control

For stable printing, the parameters related to forming both the electrostatic and toner image must be continuously monitored and adjusted by the printer. Parameter correction and control over the entire printing process is called “process control”. There are two main areas of control:

■ Bias Control

■ Toner Density Control

To supplement these two controls, the following are provided:

■ High-Area Coverage Mode Control

■ Admix Mode Control

■ Toner Density Control (CTD) Sensor (ADC - Automatic Density Control)

LED light density setting.

Bias Control

To attain stable image density , toner dens ity is monitored for each color and the drum charging voltage and biasing DC voltages are adjusted according to the monitored results for each color.

The bias control adjustment is made immediately before the start of printing, if any of the following conditions is satisfied:

■ First print produced after the power on.

■ Cumulative print count exceeds 16 since powe r on.

■ A cleaning cycle is executed during continuous printing.

2-6 Phaser 6250 Color Laser Printer Service Manual

Bias control operates as follows:

1. The Temperature/Humidity Sensor sets the target values of the drum charging

voltage and biasing DC voltage.

2. Bias control test patches (see the adjacent figure for

patch configuration) of each of the four toner colors

bout 11mm

(yellow, magenta, cyan, and black) are generated and

About 12mm

transferred to the Transfer Roller.

3. The CTD (ADC) Sensor compares an area on the

Transfer Roller where no toner is present with the test patches to determine toner density for each of the four

About 3mm

About 57m

colors.

4. The density measured in Step 3 is compared with the

target value set in Step 1 and the resulting difference is used to adjust the drum charging voltage and the biasing DC voltage for each toner color.

6250-069

Toner Density Control

Toner density must be kept constant to attain a stable print image. To achieve this goal, the rate at which toner is dispensed must be adjusted to exactly match the rate at which it is consumed. There are two systems that work in conjunction to control toner density: the Pixel Count Dispense Control (PCDC) and the Toner Density Control (CTD). (The CTD uses data from the ADC sensor, measured as described in the preceding paragraphs covering bias control.)

PCDC: The amount of toner consumed in the developing process is calculated by

counting the digital pulses applied to the Laser Unit. The toner motor is then driven for a period determined by the calculated result to supply toner to the developer, equivalent to the amount dispensed.

CTD (ADC): The toner test patches of each color (yellow, magenta, cyan, and black),

are generated and transferred to the transfer roller as specified in the Bias Control section. The CTD (ADC) sensor measuers the density of each patch. The printer adjusts the toner dispense time, which changes the quantity of toner to be dispensed. This calculation is made separately for each color. The CTD adjustment is made following completion of printing if either of the following conditions is satisfied:

■ Cumulative print count since power on exceeds 16 pages.

■ When a cleaning cycle is executed during continuous printing.

If either of the preceding control calculations results in an adjustment to the toner quantity to be dispensed, the result is calculated in terms of number of revolutions of the Toner Motor. For this description, this value is called the dispense count.

The dispense count calculated as specified above, is implemented over the next 8 prints. If 16 dispense counts are required as a result of low toner density during the CTD calculation, 2 dispense counts are added during each of the next 8 prints. This is in addition to any counts added or subtracted during each print as a result of PCDC.

Theory of Operation 2-7

If toner density is too great (excess toner) and 16 dispense counts are required to

subtract this amount, the adjustment is accomplished by subtracting 2 counts from the calculated PCDC count over each of the subsequent 8 prints. If the excess amount cannot be subtracted in 8 print cycles, it is subtracted in the ninth and subsequent prints.

otal dispense counts

orrection amount by ADC +16

ispense counts by PCDC

orrection amount by ADC -8

otal dispense counts

4534223432

Even allotment in first 8 prints

2 3 1 2 0 0 1 2 3 2

1201000022

6250-0

High-Area Coverage Mode

Continuous printing of an image with density exceeding the toner dispense capability causes the toner density in the developer to be lowered below the target toner density.

The high area coverage mode delays feeding of the next page, and dispenses toner during this time so that the toner density time reaches the specified value during continuous printing.

Admix Mode

If the high area coverage mode can not deal with the reduction of toner density in the developer or if the machine is moved to an environment wit h a di fferent humidity level, the reference value for the toner density will change. This causes a large discrepancy between the measured values from the CTD sensor and the referenced value for the toner density.

Admix mode dispenses the toner immediately to prevent low-toner density. If the patch density result measured by the CTD Sensor is lower than the reference value from the toner density control, then the admix mode is initiated.

LED Light Density CTD (ADC) Control of Sensor

The CTD (ADC) sensor is a reflective sensor that emits light from an LED in the sensor and detects the reflected light from the transfer roller. For exact density measurement, the sensor output value (reflected light density) must be the specified value when no toner is put on the Transfer Roller. The reflected light density varies

2-8 Phaser 6250 Color Laser Printer Service Manual

depending on the Transfer Roller surface condition or dirty condition of CTD (ADC) sensor surface. The light density emitted from the LED is controlled so that the reflected light density meets the specified value.

This control is implemented in two ways:

■ Sets the light density so that the light reflected satisfies a specific value.

■ Adjusts the subsequent light density to be within a specific tolerance value.

1. Light Density Setting

The reflected light density can vary greatly if the transfer roller has been replaced or the CTD (ADC) sensor has been cleaned. To deal with this variance the light density is reset when the power is turned on or the front cover is opened and closed.

The intensity of the LED increases gradually and the set value is adjusted when the output of the CTD (ADC) sensor does not meet the specified value. If the output of the CTD (ADC) sensor does not reach the specified value, even though the light density is increased to the maximum limit, the controller signals the sensor is dirty. If the sensor output is extremely high, the controller will signal that the sensor is faulty.

2. Light Density Adjustment

At the execution of automatic density control, the light density adjustment is made just before the patches for toner density control are generated.

Light is emitted from the LED using the current light density setting, to check if the output value of the CTD (ADC) sensor is within the specified range. If the output value is low, light density is increased. If the output value is high, the light density is decreased.

If the output value is less than the first lower limit, the controller signals the sensor as dirty and generates a warning. If the output value is less than the second lower limit, the controler signals that the sensor is faulty and stops the printing.

Color Registration Control

The printer uses a quad system where drums and developers are used exclusively for each of the four colors (yellow, magenta, cyan, and black). Images are formed on the drums, in the respective colors, and then layered to form one image. To avoid a positional shift between the different color images, the color registration control calculates how much the registration has shifted by comparing each of the other color patches in the registration string to the black bar that precedes it. Shift is corrected by adjusting the laser write timing to compensate.

Color registration control is made depending on the internal temperature and print count at the execution of process control.

Theory of Operation 2-9

+n of this control is outlined below:

1. With no toner on the Transfer Roller, the output value of Sensor, CTD (ADC) is

measured to determine the threshold value.

2. Patches for color registration control are

generated on the Transfer Roller. These

10mm

patches are composed of 10mm lines of each toner color in the following order: K, C, K, M, K, and Y with each color dispensed in the amount of four dispense counts. The string of patches is led by a black trigger patch that is larger than the registration patches.

3. The density of patches generated by the

About one turn of BTR

CTD (ADC) sensor is measured.

4. The amount of registration shift is

calculated from the threshold value determined in Step 1 and the patch density measured in Step 3.

6250-068

5. The laser write timing is changed to

compensate for the amount of registration shift.

K K C K M K Y

2-10 Phaser 6250 Color Laser Printer Service Manual

Transfer Roller Assembly Control

Detecting the Installation of the Transfer Roller Assembly

Although there is no seperate sensor for this, the output of the CTD Sensor is used to detect installation or absence of the Transfer Roller when power to the printer is turned on, or the front cover is opened and closed.

Light emits from the LED of the CTD sensor with the specified intensity and if the output of the CTD Sensor is greater than th e specified value the controller signals that the Transfer Roller is present (installed).

If printing is stopped by a jam, the toner image will be placed on the Transfer Roller. In this case the sensor output result is low, causing the controller to report the Transfer Roller as missing. To prevent this, the Transfer Roller is rotated a half turn if output is lower than the specified value. If the output of the CTD sensor is than greater than the specified value, the controller reports installation of the Transfer Roller. If the output remains less than the specified value, the controller reports that the Transfer Roller is not installed.

Detecting the Life of the Transfer Roller Assembly

The Transfer Roller Assembly consists of a bias transfer roller and a waste toner recovery space. End of life of the Transfer Roller is detected when the waste toner recovery space becomes full.

The full waste toner recovery space is detected by the Toner Full Sensor.

1. Status of the waste toner recovery space is checked:

■ When the power is turned on.

■ When the front cover is opened and closed.

■ When paper exits the print engine.

2. “Transfer Roller is at End of Life” error message is generated when the toner full

sensor detects the waste toner recovery space is full.

3. “Replace Transfer Roller ” warning message is generated if the print count and

the toner dispense time are counted and the total count exceeds 15,000 prints.

4. “Transfer Roller is at End of Life” error/ “Replace Transfer Roller ” warning

messages are reset if the toner full sensor does not detect a full waste toner recovery space when power is turned on, or the front cover is opened and closed.

Theory of Operation 2-11

Toner Control

T oner Cartridge installation is detected by the Toner Present (CTG-In) Switch, and the presence of toner is detected by the Tone r Low Sensor. These switches and sensors are provided for each toner color (CMYK), and detection is made for each individually.

Toner Low Sensor

The toner low sensor checks one color every 3.5 seconds, requiring 14 seconds to detect all four colors.

The toner low sensor is attached to the Toner Cartridge Holder Assembly. It detects toner dispensed by the toner motor from the toner cartridge into the auger tube.

The toner low sensor can make a false detection if toner has stuck to the surface of the sensor. To prevent this, a film attached near the auger in the toner cartridge holder assembly cleans the sensor surface whenever toner is dispensed. This film rotates with the auger as toner is dispensed, scraping toner off the toner lo w sensor surface.

The toner low sensor may detect toner even if toner is not present or may not detect the toner even if toner is present, depending on the film position when the toner motor stops. This is avoided by the printer’s internal toner presence control.

Toner Presence Control

1. Checks for toner presence when the power is turned on, or after the front co v er is

opened and closed. Checks every 14 seconds when printing.

2. The "Toner Empty” warning is displayed when the counter on the Customer

Replaceable Unit Monitor (CRUM) indicates that the toner is empty.

3. The "Toner Empty” error is displayed when the toner low sensor detects that

toner is empty.

4. When a new toner cartridge is installed (“Toner Empty error” not being

generated), toner is dispensed for 1.7 seconds. At the next toner control timing, if the toner low sensor detects toner present, the “Toner Full”, "Toner Empty Warning", and "Ton er Emp ty Error" are reset. When toner is dispensed and the toner low sensor detects toner present three or more times consecutively, the controller regards this status as "Toner Present".

5. If the toner low sensor does not detect toner present, toner will be dispensed for

1.7 seconds again 5 seconds later. If toner present is not detected after executing toner dispense three times and if toner cartridge dispense time shows 0, “Remove Ribbon From ‘x’ Cartridge” error is displayed.

2-12 Phaser 6250 Color Laser Printer Service Manual

Fuser Control

Fuser Temperature Control

During fuser temperature control the printer’s target temperature is set. The heat roller surface temperature is controlled to match the target temperature by turning the heater lamp on/off.

The heat roller surface temperature is detected by two sensors. A non-contact sensor in the middle of the roller is checked for 60ms and the Temperature Sensor at the edge of the roller is checked for 20ms to maintain an even temperature across the roller. If the results of the 80ms cycle show the temperature is higher than the target, the heater lamp is turned off. If the detection result is low, the heater lamp is turned on.

For the target temperature, different temperatures are set for standby, printing, and process control. The target temperature is also changed according to the inside temperature detected with the temperature/humidity sensor, print count, print mode, input power supply voltage and paper type.

Cool Down

During printing, the temperature distribution of the heat roller becomes uneven between paper and non-paper. To make the heat roller temperature as even as possible, a wait time is provided and the heater lamp is kept off. This is called the cool down.

A cool down is executed according to the number of sheets continuously printed when a set, printing with a certain type and size of print media is completed, and when the print media type or size is changed. The cool down, which results in a pause, occurs evenly in the middle of several hundred sheets of continuous printing.

Theory of Operation 2-13

Paper Path of the Printer

: Laser beam : Paper path : Paper sensors

EXIT ROLL

APER PICK ROLLER (T2)

PAPER PICK ROLLER (T3)

PAPER PICK ROLLER (T4)

PAPER FEED ROLLER (T2)

PAPER FEED ROLLER (T4)

MID ROLL

TURN ROLL

TURN CHUTE ASSY (T2) TURN ROLL ASSY (T2)

TURN CHUTE ASSY (T3) TURN ROLL ASSY (T3)

PAPER FEED TRAY

PAPER FEED ROLLER (T3)

TURN CHUTE ASSY (T4)

TURN ROLL ASSY (T4)

PAPER FEED TRAY

FUSER ASSY

DUPLEX ROLLE

TRANSFER ROLLER

METAL ROLL REGISTRATION ROLL

FEED ROLL ASSY RETARD ROLLER

6250-0

2-14 Phaser 6250 Color Laser Printer Service Manual

Paper Path Route

OPTIONAL FEEDERS

Paper Tray 4

Paper Tray 3 Paper Tray 2

Tray 1 (MPT)

Paper feed by

"Paper Pick Assy (T4)"

Paper feed by "Paper Feed Rollers" (Nudge and Retard)

(Tray 4)

Paper transfer by "Tray 4 Turn Roll"

and

"Tray 4 Turn Chute Assy"

Paper transfer by "Tray 3 Turn Roll"

and "Tray 3 Turn Chute Assy"

Paper transfer by the

Paper transfer by the "Chute Assembly, Registration (REGI) (Metal and Registration Rolls)

Paper feed by

"Paper Pick Assy (T3)"

Paper feed by "Paper Feed Rollers" (Nudge and Retard)

(Tray 3)

"Tray 2 Turn Roll"and "Tray 2 Turn Chute Assy"

Paper feed by

Paper Pick Assy

Paper feed by

"Paper Feed Rollers"

(Nudge and Retard)

(Tray 2)

(T2)"

"Paper Feed (Retard) Roller"

"Tray1 Feed Roller"

Paper transfer by the "Imaging Unit IDT2" and "Transfer Roller"

Paper transfer by the "Fuser Assembly" (Heat Roll and Fuser Belt)

Paper transfer by the "Fuser Assembly "Exit Roll" and "Pinch Roll"

Paper feed by

and

Paper transfer by

"Turn Roll"

and

"Pinch Roll"

Paper transfer by the "Chute Assembly, Exit" and "Chute Assembly, Out"

Print output

Paper transfer to duplex path by

reversing "Exit Roll" and "Mid Roll"

Paper transfer by "Duplex Rollers"

to Print Output

6250-49

Theory of Operation 2-15

Major Assemblies and Functions

The following section details all major components of the printer and their relative functions.

Frame and Drive Assemblies

6250-0

1. Developer Drive Assembly: Supplies the drive to the Imaging Unit

Developer.

2. Main Drive Assembly: Supplies the drive to the following parts:

■ Paper Feeder

■ Retard Housing Assembly

■ Chute Assembly, Out (MPT position)

■ Chute Assembly, Registration

■ Imaging Unit (IDT 1, IDT 2, Drum)

■ Transfer Roller

2-16 Phaser 6250 Color Laser Printer Service Manual

Main Drive Assembly - Transmission Route

MAIN DRIVE ASSY

GEAR IDLER IN

CLUTCH ASSY TURN

ROLL ASSY TURN GEAR IDLLER FEED

PAPER FEEDER

CLUTCH TURN

ROLL TURN

GEAR IDLLER

GEAR FEED H1

GEAR FEED1

ROLL ASSY FEED

GEAR MSI

ROLL ASSY FEED

Regi.Clutch

Regi.Roll

CHUTE REGI

IDT2

IDT1 (2)

HOUSING ASSY RETARD

CHUTE ASSY OUT

Drum (4)

IMAGING UNIT

TRANSFER

ROLLER

6250-04

Theory of Operation 2-17

Gear Layout - Print Engine and Tray 1

The drawing below shows the location of the various components specified in the Transmission Route Block Diagram on the preceding page.

FRONT

1. Retard Housing 9. Turn Clutch Assembly

2. Tray 1 Gear 10. Gear Idler Feed

3. Registration Chute Assembly 11. Gear Feed 1

4. Registration Clutch 12. Gear Feed H1

5. Transfer Roller 13. Paper Pick Assembly (Tray)

6. Chute Assembly Out 14. Gear Idler

7. Imaging Unit 15. Gear Idler In

8. Main Drive Assembly 16. Turn Clutch

6250-05

2-18 Phaser 6250 Color Laser Printer Service Manual

Paper Tray 2

6250-05

1. Paper (Retard) Feed Roller: The paper retard feed roller prevents more than

1 sheet at a time from printing. The paper feed retard roller and the paper feed nudge roller are interchangeable parts in all trays.

2. Side Guides Right and Left: The side guides move against media to align or

3. Rear Guide: The rear guide moves to determine the length of print media in the

paper feed direction. The paper size switch uses this rear guide to detect the paper size.

Theory of Operation 2-19

Paper Feed - Tray 2

6250-05

1. Temperature/Humidity Sensor: Detects temperature and humidity inside the

printer to adjust the charge voltage (the voltage supplied to the transfer roller and the developing bias).

2. No Paper Sensor: Detects presence or absence of print media in the tray based

on the position of the Actuator.

3. Paper Pick Rollers: When the feed solenoid energizes, the spring feed force

engages the gear feed and the gear idler feed to turn and feed the paper from the paper tray. This activates the pick-up assembly. After completion of one turn, determined by a cutout in the gear feed, the gear feed and the gear idler feed are disengaged stopping the paper retard feed roller. This allows one sheet to be fed at a time.

4. Turn Clutch Assembly: Transfers the drive energy from the main drive

assembly to the roll turn assembly.

5. Paper Size Switch: Detects print media size and installation of the paper tray.

6. Gear Feed: See Paper Pick Rollers.

7. Spring Feed: See Paper Pick Rollers.

2-20 Phaser 6250 Color Laser Printer Service Manual

8. Gear Idler Feed: See Paper Pick Rollers.

Note

9. Feed Solenoid: Controls the operation (rotation/stop) of the Feed Roller

Assembly by controlling the rotations of the Gear Feed.

10. Low Paper Sensor: The actuator lowers as print media is used in the tray.

When the actuator lowers to a pre-determined postion, it blocks the sensor beam to trigger a low paper status. The actuator position can be seen from the front of the paper tray allowing confirmation of the print media quantity.

11. Paper Feed Roll: See paper Pick Rollers.

12. Roll Turn Assembly: The roll turn assembly receives drive energy from the

main drive through the turn clutch and transports the print media out of the paper tray to the registration roller.

High-Capacity Feeder Trays 3 and 4

The callouts in the following figure refer to the identifying numbers in the preceding paragraphs. The T3 and T4 in the callouts identify the tray. Tray 2 paper pick assembly has a different part number than the HCF Tray 3 and Tray 4 paper pick assembly.

2(T3)

11(T3)

3(T3)

2(T3)

4(T3)

9(T3)

5(T3)

9(T4)

4(T4)

2(T4)

11(T4)

3(T4)

2(T4)

5(T4)

6250-4

Theory of Operation 2-21

500-Sheet Feeder Tray 3

Note

Tray 2 paper pick assembly has a different part number than the 500-Sheet Feeder, Tray 3 paper pick assembly.

12T3

3T3

2T3

4T3

5T3

11T3

9T3

6250-4

2-22 Phaser 6250 Color Laser Printer Service Manual

3(T3)

3(T4)

6250-4

1. HCF Feeder Circuit Board: Controls the paper pick-up operation of each tray

based on communication with the Engine Control Board and information from the sensors and switches.

Major Functions:

■ Communicates with the Engine Control Board.

■ Receives information transmitted from the sensors and switches.

■ Controls the Feeder Drive Assembly.

■ Controls the paper pick process.

■ Distributes the DC voltage power supplied from the print engine to each

component.

2. Feeder Drive Assembly: Supplies the drive to the Tray 3 and 4.

3. Low Paper Sensor: The actuator lowers as print media is used in the tray.

When the actuator lowers to a pre-determined postion, it blocks the sensor beam to trigger a low paper status. The actuator position can be seen from the front of the HCF allowing confirmation of the print media quantity.

Theory of Operation 2-23

6250-40

1. 500-Sheet Feeder Circuit Board: Controls the paper pick-up operation of

tray 3 based on communication with the Engine Control Board and information from the sensors and switches.

Major Functions:

■ Communicates with the Engine Control Board.

■ Receives information transmitted from the sensors and switches.

■ Controls the Feeder Drive Assembly.

■ Controls the paper pick process.

■ Distributes the DC voltage power supplied from the print engine to each

component.

2. Feeder Drive Assembly: Supplies the drive to the tray 3.

3. Low Paper Sensor: The actuator lowers as print media is used in the tray.

When the actuator lowers to a pre-determined postion, it blocks the sensor beam to trigger a low paper status. The actuator position can be seen from the front of the 500-Sheet Feeder allowing confirmation of the print media quantity.

2-24 Phaser 6250 Color Laser Printer Service Manual

HCF Drive and Gears - Transmission Route

6250-444

6250-443

CLUTCH ASSY TURN

GEAR IDLER IN

GEAR IDLER

DRIVE ASSY FEEDER

GEAR IDLER

LUTCH ASSY TURN

GEAR IDLER IN

GEAR IDLER

FRONT

GEAR IDLLER IN

CLUTCH ASSY TURN

ROLL ASSY TURN

GEAR IDLER FEED

GEAR FEED1 GEAR FEED H1

PICK UP ASSY T3

GEAR IDLER FEED

GEAR FEED1 GEAR FEED H1 PICK UP ASSY T4

LOWER FEEDER DRIVE ASSY

GEAR IDLER GEAR IDLLER

GEAR IDLLER FEED

GEAR FEED H1

GEAR FEED 1

ROLL ASSY FEED

PICK UP ASSY T3

GEAR IDLER IN

CLUTCH ASSY TURN

ROLL ASSY TURN GEAR IDLLER FEED

PICK UP ASSY T4

GEAR IDLLER

GEAR FEED H1

GEAR FEED1

ROLL ASSY FEED

Theory of Operation 2-25

500-Sheet Feeder Drive and Gears - Transmission Route

CLUTCH ASSY TURN

GEAR IDLER IN

GEAR IDLER

RIVE ASSY FEEDER SINGLE

FRONT

GEAR IDLLER IN

CLUTCH ASSY TURN

ROLL ASSY TURN

GEAR IDLER FEED

GEAR FEED1 GEAR FEED H1 PICK UP ASSY T3

6250-40

DRIVE ASSY FEEDER SINGLE

GEAR IDLER

GEAR IDLLER FEED

GEAR FEED H1

GEAR FEED 1

ROLL ASSY FEED

PICK UP ASSY 2T

6250-40

2-26 Phaser 6250 Color Laser Printer Service Manual

Retard Housing Assembly

1. Roll Turn: The roll turn is rotated by the main drive assembly, through the turn

clutch to feed paper from Tray 1 to the registration chute, (Registration Roll - See “Xerographics” on page 2-35.).

2. Turn Clutch: Transfers drive energy from the main drive assembly to the roll

turn through a friction clutch.

6250-057

Theory of Operation 2-27

Chute Assembly In

6250-058

1. CTD (ADC) Sensor: Detects the presence of the Transfer Roller and monitors

the density of toner on the surface of the transfer roller then feeds it back to the process control.

2. Fuser Assembly: See “Transfer Roller and Fuser Assembly” on page 2-33.

3. Waste Toner Full Sensor: Detects when the waste toner collect space in the

transfer roller assembly is full.

4. Fuser Drive Assembly: Supplies the drive to the Fuser Assembly.

2-28 Phaser 6250 Color Laser Printer Service Manual

Chute Assembly Out

6250-05

1. Full Stack (Output Tray Full) Sensor: Detects a full output tray (over

accumulation of print media) by the position of the actuator. This is only checked when the paper is feeding into the exit.

2. Duplex Jam Sensor: Detects when print media has reached and passed

through the duplex roller based on the position of the actuator.

3. Duplex Roller: The duplex roller rotates under drive from the duplex motor and

feeds the print media returned from the chute assembly exit to the roll turn in the retard housing assembly.

4. Gear (Main Drive): See Feed Roll Assembly.

5. Tray 1 Gear: See Feed Roll Assembly.

6. Feed Roll Assembly: When the Tray 1 feed soleniod energizes, the Tray 1

gear and the idler gear are engaged by the force of the spring solenoid. The feed roll rotates from the drive of the Main Drive Assembly and feeds paper from

Theory of Operation 2-29

Tray 1. After rotating one turn, the Tray 1 gear and the gear idler are disengaged, the drives and feed roll stop, allowing only one sheet of paper to be fed through at a time.

7. Tray1 No Paper Sensor: Actuator detects whether print media is present. No

paper sensor beam is interrupted.

8. Tray1 Feed Solenoid : Controls the operation (rotation/stop) of the Feed Roll

Assembly by controlling the rotations of the Tray 1 Gear.

Chute Assembly Exit

6250-060

1. Duplex Motor: Supplies the dri ve to the e xit roller , mid roller , and duple x roller.

2. Mid Roller: See Exit Roller.

3. Exit Roller: Rotates through the drive from the Duplex Motor and drives the

fused print media partially into the output tray where it then reverses in duplex mode and feeds the print media (fused on one side) in the direction of the Registration Chute.

2-30 Phaser 6250 Color Laser Printer Service Manual

Duplex Motor Drive and Gear - Transmission Route

DUPLEX MOTOR ASSY

GEAR 48

GEAR 40/42

GEAR ROLL

EXIT ROLL

GEAR ROLL

MID ROLL

CHUTE ASSY EXIT

GEAR 48

GEAR 40/42

GEAR42

GEAR 30

DUPLEX ROLL

CHUTE ASSY OUT

6250-05

FRONT

6250-06

1. Chute Assy Out 4. Gear 40/42 7. Motor Duplex 10. Gear 42

2. Chute Assy Exit 5. Gear Roll 8. Gear 48 11. Gear 30

3. Gear 48 6. Gear Roll 9. Gear 40/42

Theory of Operation 2-31

Chute Assembly Registration (REGI)

6250-49

1. Registration Roller (Rubber): Receives drive energy from the main drive

assembly through the re gist ra tio n clu tch. Works with the registrat ion m etal ro ller to correct media skew and transport the media from paper tray 1 or 2.

2. Registration Roller (Metal): Works in conjuction with the rubber roller.

When the leading edge of the paper arrives at the registration rubber roller/metal roller, the rollers are not turning and the paper buckles against the rollers to correct any skew at the leading edge.

3. OHP (Transparency) Sensor: Paper reflects radiated light and the OHP

sensor can sense reflected light and identify the print media as paper . If the OHP sensor cannot sense reflected light, it identifies the print media as OHP (transparency).

4. Registration Sensor: Detects the when the print media leading edge has

reached the Registration Chute.

5. Registration Clutch: Transmit s the drive from the main drive assembly to the

registration rollers once media skew has been corrected.

2-32 Phaser 6250 Color Laser Printer Service Manual

Transfer Roller and Fuser Assembly

6250-06

1. Fuser Assembly: Using heat and pressure, the fuser assembly fixes the

transferred toner onto print media.

Parts of the Fuser Assembly:

■ Heat Roll ■ Heat Lamp

■ Thermostat ■ Temperature Sensor

■ Belt Unit ■ Exit Roll Assembly

■ Exit Sensor ■ CRUM

2. Exit Sensor: Detects passage of the print media after fusing.

3. Fuser Fan: Cools the fuser assembly to prevent overheating.

4. Transfer Roller: Consists of the transfer roller and a waste toner recovery

system. The transfer roller transfers the image from IDT2 in the imaging unit onto the print media.

Theory of Operation 2-33

Fuser Drive Assembly - Transmission Route

FUSER DRIVE ASSY

Heat Roll

Gear Exit

Exit Roll Assy

FUSER ASSY

6250-04

2-34 Phaser 6250 Color Laser Printer Service Manual

Xerographics

6250-06

1. Imaging Unit: The Imaging Unit carries out the operations of the printing

process, such as charging, developing, and primary transfer. The Imaging Unit consists of the following parts:

■ Drum (Y M C K ) ■ Developer (Y M C K )

■ Charge Roller (Y M C K ) ■ Refresher (Y M C K )

■ IDT1 (2) ■ IDT2

■ IDT1 Cleaner (2) ■ IDT2 Cleaner

2. Laser Unit: The Laser Unit receives image data and generates laser beams to

form an electrostatic latent image on the surface of each of the four imaging unit drums. The Laser Unit Assembly consists of the following parts:

LD Assembly Scanner Assembly SOS Board Lens Mirror Window

3. Chute Assembly Registration: See “Chute Assembly Registration (REGI)”

on page 2-32.

Theory of Operation 2-35

Imaging Unit Charge Voltage Contacts

6250-07

1. Charge Voltage

2. Developer Voltage

3. IDT2 Voltage

4. IDT2 Refresher/Cleaner

5. IDT1 Voltage

6. IDT1 Refresher/Cleaner

7. Drum Refresher/Cleaner

8. Drum Ground Contacts

2-36 Phaser 6250 Color Laser Printer Service Manual

7 6 5

6250-07

Imaging Unit - Left Side View

1. IDT2

2. IDT2 Refresher/Cleaner

3. IDT1

4. IDT1 Refresher/Cleaner

5. Drum Refresher/Cleaner

6. Developer

7. Charge Roller

Theory of Operation 2-37

Toner Cartridge Assembly

)

4 (Y)

3 (Y)

3 (M)

3 (C)

3 (K

4 (K)

4 (C)

4 (M)

6250-06

5 (Y)

5 (M)

5 (C)

5 (K)

1. Sub-High Voltage Power Supply Board: Supplies high-voltage to the

Transfer Roller and the Detack Saw for the ‘tertiary transfer’ and ‘static elimination’ part of the printing process.

2. CRUM Reader: The Customer Replaceable Unit Monitor (CRUM) detects toner

usage and provides a front panel monitor of remaining levels for each color.

3. Toner Cartridge [Y] [M] [C] [K]: Individual toner bottles containing toner

mixture.

4. T oner Cartridge Holder Assembl y and Toner Motors [Y] [M] [C] [K]: The

To ner Cartridge Holder Assemblies each contain a toner motor which supplies the drive to the Agitator in the Toner Cartridges and to the Auger in the Toner Cartridge Holder, supplying toner to the developer in the Imaging Unit.

5. Low Toner Sensor [Y] [M] [C] [K]: Detects level of toner in each auger tube.

6. Circuit Board, EEPROM: Consumable use (Fuser and Imaging Unit NVRAM

Data) information is stored and communicated to the Engine Control Board.

2-38 Phaser 6250 Color Laser Printer Service Manual

Toner Cartridge Assembly - cont’d

4 3 1 2

6250-07

1. Agitator Assembly

2. Toner Motor

3. Auger Assembly

4. Auger Tube

Theory of Operation 2-39

Toner Motor Drive Assembly - Transmission Route

Toner Motor

Gear

Auger

Film Agitator

TONER CARTRIDGE HOLDER ASSY

Gear

TONER CARTRIDGE

Developer Assembly Transmission Route

DEVELOPER DRIVE ASSY

Developer (Y) Developer (M) Developer (C) Developer (K)

IMAGING UNIT

6250-0

2-40 Phaser 6250 Color Laser Printer Service Manual

Electrical

6250-0

1. Engine Control Board: Controls printing operation based on the

communication with the Image Processor Board and input from the sensors and switches. Incorporates functions of the High-Voltage Power Supply.

Major Functions:

■ Communicates with the Image Processor Board

■ Receives information from the sensors and/or switches.

■ Controls the Laser Unit.

■ Supplies high-voltage to the Imaging Unit to perform charging,

development, primary transfer and secondary transfer

2. Image Processor Board: Receives data from the workstation or host,

rasterizes the data and passes it on to the Engine Control Board. The microprocessors on the Image Processor Board, generate the control signals used by the Engine Control Board. The system NVRAM chip is also located on this board and stores several printer parameters.

3. Motor Driver Board: Controls motors through the signals received from the

Engine Control Board and sends information from the sensors and switches to the Engine Control Board. Power from the low-voltage power supply is supplied to the Engine Control Board through the Motor Driver Board. The interlock switch is mounted on the Motor Driver Board.

Theory of Operation 2-41

Major Functions:

■ Receives information from the sensors and switches.

■ Controls the motor in the Main Dri ve Assembly, Developer Dri ve As sembly,

Fuser Drive Assembly, Duplex Motor Assembly and the Holder Toner Cartridge Motor Assembly.

■ Distributes the low-voltage DC power from the Low-Voltage Power Supply.

■ Controls the 24 VDC circuit through the interlock switch.

4. Rear Fan: Removes heat from the printer to prevent over-heating.

5. Low-Voltage Power Supply Board: Supplies AC power from the power

source to the Fuser Assembly heater. Generates and supplies stable low-voltage DC power (+3.3 VDC, +5 VDC, and +24 VDC) to be used for the logic and other circuits within the printer.

6. AC Switch Harness Assembly: Consists of the main switch and harness.

Controls the supply of AC power from the power source to the Low-Voltage Power Supply.

2-42 Phaser 6250 Color Laser Printer Service Manual

Error Messages and Codes

In this chapter...

■ Introduction

■ Servicing Instructions

■ Service Diagnostics

■ Error Messages and Codes Troubleshooting Procedures Table

Chapter

Introduction

Note

This section provides troubleshooting information related to the Phaser 6250 Color Laser Printer’s front panel error messages and codes. Only jams and fatal errors will produce an associated numeric code. Error messages and codes are generally specific, making it important that service personnel and users record error messages as displayed, and provide that information when reporting problems with the printer. Any code associated with an error message or jam can be viewed by pressing the INFO

button and scrolling to the bottom of the help text displayed on the front panel.

Some procedures require running service diagnostic test functions to verify a specific printer part is operating correctly. For information on Service Diagnostics and all internal printer test functions, see the table "Service Diagnostics" on page 3-9

To troubleshoot problems, such as start up and power on, media, paper path, printquality or image problems, and electrical failures not associated with a front panel message or code, refer to the section "Troubleshooting" on page 4-1.

If an error message or code is not visible on the front panel, the usage profile report and fault history list errors reported by the printer.

Jam error histories have a slightly different format than other error codes. The correlation between the Jam Error Help Text and the equi valent Fault History Code is given in the "Jam History Error Codes Table" on page 3-16

When an error first occurs, record the error message and code then cycle power to the printer to see if the error recurs. These can be accessed one of three ways:

Accessing Fault History

1. Print (if possible) the Printer Status Page from the printer’s front panel Troubleshooting Menu --> Service Tools . The fault history is listed on the

second page of the report.

2. View the printer’s fault history on the front panel. Go to Troubleshooting Menu --> Service Tools --> Engine Error History.

Definitions of the fault codes that appear in the fault history are given in "Printer Status Codes" on page A-2.

3. If the printer is connected to a network and has a TCP/IP address, view the

printer’s web page using a web browser.

a. Open a web browser. b. Enter the printer’s IP address as the URL. c. Select the Support Tab/Troubleshooting/Diagnostics Logs and the fault

history will be displayed.

4. If additional information is required, print the Service Usage Profile from the

printer’s front panel Troubleshooting Menu --> Service Tools.

3-2 Phaser 6250 Color Laser Printer Service Manual

Servicing Instructions

The Service Flowchart below is an overview of the path a service technician should take when servicing the printer and printer optional equipment.

Step 1 - Identify the Problem

1. Verify the reported problem does exist. Verify failure symptoms/behavior/noises

with cusotmer/end user.

2. Check for any error codes and write them down.

3. Print normal customer prints and service test prints.

4. Make note of any print quality problems in the test prints.

5. Make note of any mechanical or electrical abnormalities present.

6. Make note of any unusual noise or smell coming from the printer.

7. Print a Printer Status Page, if the printer is able to print.

8. View the fault history under the Service Tools Menu

9. Verify the AC input power supply is within proper specifications by measuring the

voltage at the electric outlet while the printer is running.

Step 2 - Inspect and Clean the Printer

1. Switch OFF printer power.

2. Disconnect the AC power cord from the wall outlet.

3. Verify the power cord is free from damage and is connected properly.

4. Remove the Imaging Unit and protect it from light.

5. Inspect the printer interior and remove any foreign matter such as paper clips,

staples, pieces of paper, dust or loose toner.

■ Do not use solvents or chemical cleaners to clean the printer interior.

■ Do not use any type of oil or lubricant on printer parts.

■ Use only an approved toner vacuum.

6. Clean all rubber rollers with a lint-free cloth, dampened slightly with cold water.

7. Inspect the interior of the printer for damaged wires, loose connections, toner

leakage, and damaged or obviously worn parts.

8. If a toner cartridge appears obviously damaged or empty, replace with a new one.

Step 3 - Find the Cause of the Problem

1. Use the Error Messages and Codes troubleshooting procedures to find the cause

of the problem.

2. Use Diagnostics to check printer and optional components.

3. Use the Wiring Diagrams and Plug/Jack Locator to locate test points.

4. Take voltage readings at various test points as instructed in the appropriate

troubleshooting procedure.

5. Use the "Print Engine Test Print" on page 5-9, to isolate problems to the Engine or

the Image Processor Board.

Step 4 - Correct the Problem

1. Use the Parts List to locate a part number.

2. Use the Disassembly Procedures to replace the part.

Step 5 - Final Check

1. Test the printer to be sure you have corrected the initial problem and verify there

are no additional problems present.

Error Messages and Codes 3-3

Using the Troubleshooting Procedures

1. Each Step in a Troubleshooting Procedure instructs you to perform a certain

action or procedure. The Steps are to be followed sequentially in the order given until the problem is fixed or resolved.

2. The Actions and Questions box contains additional information and/or additional

procedures you must follow to isolate the problem.

3. When a procedure instructs you to test a component using service diagnostics,

See "Service Diagnostics" on page 3-6 for the detailed Steps and functions for testing parts of the printer.

4. The action is followed by a question. If your response to the question is “Yes”,

then follow the instructions for a “Yes” reply. If your response to the question is “No”, then follow the instructions for a “No” reply.

5. Troubleshooting Procedures may ask you to take voltage readings or test for

continuity at certain test points within the printer. For detailed diagrams, refer to the section "Plug/Jack Locator Maps" on page 10-2 and "Wiring Diagrams" on page 10-12 for complete information on test point locations and signal names.

6. Troubleshooting Procedures often ask you to replace a printer component. The

section "Service Parts Disassembly" on page 8-1 provides detailed Steps for removing and replacing all major parts of the printer. The section "Parts List" on page 9-1 details the location, quantity and part number for all spared parts of the printer.

General Notes on Troubleshooting

1. Unless indicated otherwise, the instruction “switch ON printer main power”

means for you to switch ON printer power and let the printer proceed through Power On Self Test (POST) to a ‘Ready’ condition.

2. Conventions used in this manual to represent connectors

lug Jac

6250-5

3. When instructed to take voltage, continuity or resistance readings on wiring

harness, proceed as follows; Check P/J 232–1 to P/J 210–5 by placing the red probe (+) of your meter on pin 1 of P/J 232, and place the black probe (–) of your meter on pin 5 of P/J 210.

4. When you are instructed to take resistance readings between “P/J 232 <=> P/J

210” (without specified pin numbers), check all pins. Refer to the the section "Wiring Diagrams" on page 10-1 for the location of all wiring harnesses and pins.

5. When you are instructed to take a voltage reading, the black probe (–) is

generally connected to a pin that is either RTN (Return) or SG (Signal Ground). You can substitute any RTN pin or test point in the printer, and you can use FG (frame ground) in place of any SG pin or test point.

3-4 Phaser 6250 Color Laser Printer Service Manual

6. Before measuring voltages make sure the printer is switched ON, the Imaging

Unit and the paper trays are in place, and the interlock switches are actuated, unless a troubleshooting procedure instructs otherwise.

7. All voltage values given in the troubleshooting procedures are approximate

values. The main purpose of voltage readings is to determine whether or not a component is receiving the correct voltage value from the power supply and if gating (a voltage drop) occurs during component actuation. Gating signals may be nothing more than a pulse, resulting in a momentary drop in voltage that may be difficult or impossible to read on the average multi-meter.

8. When a troubleshooting procedure instructs you to replace a non-spared

component and that component is part of a parent assembly, you should replace the entire parent assembly.

9. Ensure that you are using a supported media size and type, refer to "Media and

Tray Specifications" on page 1-14.

Voltage Measurements

1. Power and signal grounds are connected to the frame ground. All circuit

troubleshooting can be performed using the metal frame (chassis) as the grounding point. To locate connectors or test points, refer to the section "Plug/ Jack Locator Maps" on page 10-2 or "Wiring Diagrams" on page page 10-12 for more information.

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

Stated Measured

+3.3 VDC +3.135 to +3.465 VDC +5.0 VDC +4.75 to +5.25 VDC +24.0 VDC +21.6 to +26.4 VDC

0.0 VDC Less than +0.5 VDC

Error Messages and Codes 3-5

Service Diagnostics

The Phaser 6250 Color Laser Printer has built-in diagnostics to aid in troubleshooting problems with the printer. The Service Diagnostics Menu provides a means to test sensors, motors, switches, clutches, fans and solenoids. Diagnostics also contain built-in test prints, cleaning procedures, printer status and some NVRAM access.

Service diagnostics are executed through the front panel by a certified service technician only. Service Diagnostics can be entered one of two ways:

Entering without rebooting the printer:

1. From the printer’s main menu, scroll to the Troubleshooting Menu, press OK

and then scroll to the Service Tools Menu and press OK.

2. Hold down the Up Arrow button and press the Down Arrow button, this will

display the Hidden Service Menu. Scroll to Run Service Diagnostics and press OK.

Entering by rebooting the printer:

1. Turn the printer power OFF.

2. Hold down the Back and Information buttons simultaneously and turn the

printer back ON.

3. Continue to hold the buttons until the following mesage is displayed on the front

panel: Service Diagnostics V#.##, Initializing..., and then release the buttons.

4. The front panel displa ys the Service Diagnostics Menu.

You can print a Service Diagnostics Menu Map by highlighting

Menu Map, and press OK. The printer will run through POST and return to Ready.

You will need to re-enter service diagno st ics.

Print Service

3-6 Phaser 6250 Color Laser Printer Service Manual

Service Diagnostic Front Panel Button Descriptions

Button Function

BACK Returns to the prior higher level menu structure, if available.

If help text is displayed on the front panel, pressing BACK will restore the current menu item and remove the help text.

CANCEL Terminates the current test.

Cancels current INFO display.

INFO Provides help information, if available.

UP Scrolls up one menu item within a menu list. This control does not ‘wrap’.

DOWN Srolls down one menu item within a menu list.

OK Enters the highlighted menu. Executes the current test item.

Pressing INFO again restores the current menu item and removes the help text.

Used to increment data in tests requiring user input.

This control does not ‘wrap’, the end of a menu list is designated by three asterisks. Used to decrement data in tests requiring user input.

Used to select a data value entered by the user.

Error Messages and Codes 3-7

Diagnostic Menu Map

Phaser® 6250 Service Diagnostic Menu Ma

Print Service Menu Map Prints a service diagnostic menu

map and exits service diagnostics.

General Status

Status Engine Board ROM Vers ion Printer Configuration Ambient Temp/Humidity Fuser Temperature Fault History

Test Prints Prints Test Prints stored in the MCU. The prints are

used by service personnel to identify, repair, and validate the operability of the printer.

Blank Page Print Standard Test Print Custom Test Print Current Custom Test Print Set-up Custom Test Print Parameters

Motors/Fans Tests Tests the functionality of motors and fans

by giving service personnel the ability to energize/de-energize the motor and fans one at a time.

Main Motor Duplex Motor Fuser Motor Developer Motor HCF/LTA Motor Toner Motor Yellow Toner Motor Magenta Toner Mot or Cyan Toner Mot or Black Rear Fan Fuser Fan

Sensor/Switch Tests Test the functionality of sensors and

switches by giving service personnel the ability to input actuation and state changes of all sensors and switches.

Interlock Switch Registration Sensor Exit Sensor Duplex Sensor Full Stack Sensor Black Toner (K) Low/Empty Sensor Cyan Toner (C) Low/Empty Sensor Magenta Toner (M) Low/Empty Sensor Yellow Toner (Y) Low/Empty Senso r Black Toner Cart Present Switch Cyan Toner Cart Present Switch Magenta Toner Cart Present Switch Yellow Toner Cart Present Switch Black Toner CRUM Sensor Cyan Toner CRUM Sensor Magenta Toner CRUM Sensor Yellow Toner CRUM Sensor Tray 2 Low Paper Sensor Tray 3 Low Paper Sensor Tray 4 Low Paper Sensor

Provides the following print engine status.

Sensor/Switch Tests -cont’d-

Tray 1 (MPT) No Paper Sensor Tray 2 No Paper Sensor Tray 3 No Paper Sensor Tray 4 No Paper Sensor Transfer Roller Toner Full Sensor Image Unit Installed/Not Installed Fuser Fan Alarm Sensor Rear Fan Alarm Sensor ADC (CTD) Sensor OHP Sensor Fuser Center Temp Sensor Fuser Edge Temp Sensor Fuser Center Temp Amplifier Sensor Fuser Temp Compensation Sensor

Clutch Tests Tests the functionality of the clutches by giving

service personnel the ability to energize/de-energize one clutch a a time.

Registration Clutch Tray 1 (MPT) Turn Clutch Tray 2 Turn Clutch Tray 3 Turn Clutch Tray 4 Turn Clutch

Solenoid Tests T ests the functionality of the solenoids by givin

service personnel the ability to energize/de-energize one solenoi at a time.

Tray 1 (MPT) Feed Solenoid Tray 2 Feed Solenoid Tray 3 Feed Solenoid Tray 4 Feed Solenoid

Maintenance Cleans the IDT rollers within the Imaging Unit.

Clean Imaging Unit IDT Rollers

NVRAM Access This menu lets you read, set, or reset the

following values:

PostScript NVRAM Reset MCU NVRAM Store/ Restore Toner Install Dates Toner CRUM Check CRU Life Reset CRU Life Read

IP Controller Diagnostics Tests the basic functions of the

Image Processor Controller Board.

RAM Read/Write Test

Exit Exits service diagnostics and reboots the printer.

For Authorized Service Personnel Use Only. Service Menu

functions are to be used by Xerox service personnel and authorized service providers only. The printer can be damaged b improper use of the built-in service tests.

3-8 Phaser 6250 Color Laser Printer Service Manual

Service Diagnostic Tests

Test Front Panel Display and Test Definition

Print Service Menu Map - Prints the service diagnostics menu map and exits service

diagnostics.

General Status - Provides the following print engine status:

Status <No Status to Report>

NOTE This is current status since

entering diagnostics only. It is not a Fault Log. If Ready is reached, the register is cleared.

Engine Board ROM Version

Printer Configuration

Ambient Temperature/ Humidity

Fuser Temperature

Fault History Device Status

Engine FW: #.#.# Displays the engine firmware

Memory: ###MB Hard Drive: Not Installed or Installed HCF: Installed Not Installed

Temperature: XX Humidity: ## %

Temperature: XX oC

Jams Hardware Errors Firmware Errors Fan Motors CTD (ADC) Sensor Errors Fuser Failure Laser Failure Life Over Trays Miscellaneous CRUMS

No Status to Report = the printer is online and ready to print. Displays an engine status that will prevent printing. Status is displayed sequentially, one line at a time.

version installed. Displays current memory installed.

Detects presence of Hard Drive option. Detects presence of High-Capacity Feeder option.

Displays the current Temperature and Humidity for the printer.

Displays the printers current Fuser temperature.

Displays Fault occurrence since last power cycle.

Test Prints - Prints test prints stored in the Engine Control Board. The prints are used by service personnel to identify, repair and validate the operability of the printer.

Error Messages and Codes 3-9

Test Front Panel Display and Test Definition

Blank Page Print

Standard Test Print

Custom Test Print

Current Test Print Set-Up

Custom Test Print Parameters

Motors/Fans Tests - Tests the functionality of motors and fans by giving service personnel the ability to energize/de-energize the motor and fans one at a time.

Main Motor Normal Speed

Duplex Motor Forward Normal Speed

Continuously prints blank pages until stopped by the user.

Continuously prints the Step pattern until stopped by the user.

Prints the test pattern using the custom print parameters defined by the user until stopped by the user.

Displays the print setup for the Current Test Print.

Allows various print parameters to be changed for the Custom Test Print.

Half Speed One Third Speed Normal Speed Continuous Half Speed Continuous One Third Speed Continuous

Forward Half Speed Forward Double Speed Reverse Normal Speed Reverse Half Speed Reverse Double Speed Fwd Normal Speed Contiuous Fwd Half Speed Contiuous Fwd Double Speed Contiuous Rev Normal Speed Contiuous Rev Half Speed Contiuous Rev Double Speed Contiuous

See "Front Panel Test Prints" on page 5-4, "Adjustments" on page 6-3, and "Resetting NVRAM" on page 6-4, for specific test print information.

Audible verification of motor functionality. The motor tests are pulsed or continuous.

Audible verification of motor functionality.

Fuser Motor Normal Speed

Half Speed One Third Speed Normal Speed Continuous Half Speed Continuous One Third Speed Continuous

Audible verification of motor functionality.

3-10 Phaser 6250 Color Laser Printer Service Manual

Test Front Panel Display and Test Definition

Developer Motor

Caution: Do NOT allow this motor to run any longer than necessary to verify operation.

HCF/LTA Motor Normal Speed

Toner Motor Yellow Toner Motor Magenta Toner Motor Cyan Toner Motor Black

Rear Fan High Speed

Normal Speed Half Speed One Third Speed

Half Speed Normal Speed Continuous Half Speed Continuous

Normal Speed Audible verification of motor

Low Speed High Speed Continuous Low Speed Continuous

Audible verification of motor functionality. Caution: Only run the developer motor test once per power cycle to avoid excessive amounts of toner being forced inside the developer resulting in possible damage.

Audible verification of motor functionality.

functionality. Caution: Only run the Toner Motor tests once per power cycle to avoid toner spillage inside the Imaging Unit cavity and packing the auger tubes with toner.

Audible verification of motor functionality. Check for airflow.

Fuser Fan High Speed

Sensor/Switch Tests - Tests the functionality of the sensors and switches by giving service personnel the ability to input actuation and state changes of all sensors and switches.

Interlock Switch

Registration Sensor

Low Speed High Speed Continuous Low Speed Continuous

Sensor is: ON Sensor is: OFF

Sensor is: OFF Sensor is: ON

Audible verification of motor functionality. Check for airflow.

Front Door OPEN Front Door CLOSED

This test continuously cycles paper through the printer. The sensor state changes from off to on as the paper passes through the Registration Chute. Note: This test can also be used as a paper path transport test when troubleshooting Jam conditions.

Error Messages and Codes 3-11

Test Front Panel Display and Test Definition

Exit Sensor Sensor is: OFF

Duplex Sensor Sensor is: OFF

Full Stack Sensor

Black T oner (K) Low Cyan T oner (C) Low Magenta T oner (M) Low Yellow Toner (Y) Low

Black Toner Cartridge Present Cyan Toner Cartridge Present Magenta T oner Cartridge Present Yellow Toner Cartridge Present

Sensor is: ON

Sensor is: OFF Sensor is: ON

Toner is Low Toner is NOT Low

Sensor is: OFF

Sensor is: ON

Actuate/de-actuate the Exit Actuator (PL8.1.7) located in the Fuser to toggle the sensor state.

Actuate/de-actuate the Duplex Actuator (PL6.1.13) located on the Chute Assembly Out to toggle the sensor state.

Actuate/de-actuate the Output T ray Full Actuator (PL6.1.4) at the output tray to toggle the sensor state.

Displays current state of the sensor.

Toggle the Toner Cartridge In switch (PL 10.1.22) for the appropriate color to change the sensor state. Toner Cartridge is in the LOCKED position. Toner Cartridge is in the UNLOCKED position.

Black Toner CRUM Sensor Cyan Toner CRUM Sensor Magenta T oner CRUM Sensor Yellow Toner CRUM Sensor

Sensor is: OFF

Sensor is: ON

Remove the appropriate toner cartridge and depress the Toner Cartridge In switch (PL 10.1.22) to change the sensor state. Toner Cartridge is in the LOCKED position. Toner Cartridge is in the UNLOCKED position.

3-12 Phaser 6250 Color Laser Printer Service Manual

Test Front Panel Display and Test Definition

Tray 2 Low Paper Tray 3 Low Paper Tray 4 Low Paper

Tray 1 (MPT) No Paper Sensor

Tray 2 No Paper Sensor Tray 3 No Paper Sensor Tray 4 No Paper Sensor

Transfer Roll Toner Full Sensor

Image Unit Not Installed Sensor

Fuser Fan Alarm Sensor

Size: XXXX

Paper is Not Low

Paper is Low

Paper is Not Present Paper is Present

Toner Waste [Not] Full Block the Toner Full Sensor

Image Unit is [Not] Present Open Door C to change the state

Fuser Fan Alarm Sensor is: OK Failure

Move the Rear Guide in the paper tray to the desired paper size and verify the sensor output matches the paper size selected.

Insert and fill Tray [2] [3] [4] with paper to the fill line. Insert one sheet of paper in Tray [2] [3] [4] to change the sensor state.

Insert Paper into Tray 1. Toggle the Tray 1 No Paper Actuator (PL6.1.37) to change the state.

Insert Tray [2] [3] [4] with an adequate amount of paper. Toggle the No Paper Actuator.

(PL5.1.13) to change the sensor state.

of the Switch.

Status only Note: Perform a test print immediately prior to performing this test.

Rear Fan Alarm Sensor

CTD (ADC) Sensor

Rear Fan Alarm Sensor is: OK Failure

Dark Value: # Light Value: ### Sensor OK

Status only Note: Perform a test print immediately prior to performing this test.

Status only Remove the transfer roller to observe change of state.

Error Messages and Codes 3-13

Test Front Panel Display and Test Definition

OHP Sensor OHP

Fuser Center Temp Sensor

Fuser Edge Temp Sensor

Fuser Center Temp Amplifier

Fuser Temp Compensation

Clutch Tests - Tests the functionality of the clutches by giving service personnel the ability to energize/de-energize one clutch at a time.

Absence of Media Paper

<Fuser Center Temp Sensor> Fuser (Not) Ready Sensor (Failure) is OK

<Fuser Edge Temp Sensor> Fuser (Not) Ready Sensor (Failure) is OK

<Fuser Center Temp Amplifier> Fuser (Not) Ready Temperature Amplifier (Failure) is OK

<Fuser Temp Compensation> Fuser (Not) Ready Compensation (Failure) is OK

Reports “Paper” if opaque media is present. Reports “OHP or Absence of Media if OHP or no media is present. Manually insert a sheet of paper backwards through the Registration Chute Assembly (PL9.1.6) until the state of the sensor changes to “Paper”.

Remove fuser to change sensor state.

Registration Clutch Tray 1 (MPT) Turn Clutch Tray 2 Tur n Clutch Tray 3 Tur n Clutch Tray 4 Tur n Clutch

Solenoid Tests - Tests the functionality of the clutches by giving service personnel the ability to energize/de-energize one solenoid at a time.

Clutch is: ON Clutch is: OFF

Audible verification of Clutch functionality. You should hear the clutch engage and disengage (click) on and off continuously until test is ended by pressing Cancel.

3-14 Phaser 6250 Color Laser Printer Service Manual

Test Front Panel Display and Test Definition

Tray 1 (MPT) Feed Solenoid Tray 2 Feed Solenoid Tray 3 Feed Solenoid Tray 4 Feed Solenoid

Maintenance - Cleans the Intermediate Transfer Unit within the Imaging Unit. Clean Imaging

Unit IDT 1 Clean Imaging Unit IDT 2

NVRAM Access - This menu lets you read, set or reset the following values: PostScript

NVRAM Reset

MCU NAVRAM Store/Restore

Solenoid is: ON Solenoid is: OFF

Printing..... “Printing” is displayed on the Front

Resetting PostScript NVRAM... Are you sure? Yes NO

Save Engine NAVRAM

Restore Engine NAVRAM

Audible verification of the Solenoid function.

Panel during the IDT cleaning cycle. The test continuously cycles paper through the printer until the Cancel button is pressed.

Restores the Printers setup values to their factory defaults. For more information on resetting NVRAM, See “Resetting NVRAM” on page 6-4.

Saves critical engine parameters; printer installation date, printer page count, imaging unit life count, transfer roller life count to Image Processor Board before replacing the Engine Control Board. Restores previously saved critical engine parameters to the Engine Control Board after replacement.

Toner Install Dates

Toner CRUM Check

CRU Life Reset

Black Toner Install Date Cyan Toner Install Date Magenta Toner Install Date Yellow Toner Install Date

(<Color> Not) Genuine Xerox Toner Verifies that genuine Xerox tone r is

Sets life count of transfer roller to unused.

Allows toner cartridge install dates to be viewed, or to be changed when current value is corrupted or obviously incorrect.

installed in the printer. Resets the life count stored in

NAVRAM.

Error Messages and Codes 3-15

Test Front Panel Display and Test Definition

CRU Life Read Black Toner (K) Life

CRU Life Restore

IP Controller Diagnostics - Tests the basic functionality of the Image Processor Board. RAM Read/

Write Test

Exit - Exits service diagnostics and reboots the printer.

Cyan Toner (C) Life Magenta Toner (M) Life Yellow Toner (Y) Life Transfer Roller Life Read Printer Page Count Imaging Unit

Count 1: number of sheets fed

through imaging unit

Count 2: Drum rotations Count 3 - 6: [Y] [M] [C] [K]

dispense time Fuser Life Save Engine NAVRAM

Restore Engine NAVRAM Used after Engine Control Board

Executing.....

Passed

Accesses the various life counts stored in NAVRAM and allows values to be saved when the Engine Control Board is changed.

replacement to restore the previously saved life values to NAVRAM.

Does an extended memory test on the Image Processor Board. Note: Cycle power to the printer after executing this test.

Jam History Error Codes Table

Jam History, located in the Troubleshooting/Service Tools menu on the Front Panel, uses a two field format. The first fi eld re presents the Jam location. The second field indicates the page count when the jam occurred.

Jam History

Front Panel Message Help Text/Code

Misfeed at Tray 1 (MPT) Jam T1/155 1 Misfeed at Tray 2 Jam T2/156 2 Misfeed at Tray 3 Jam T3/157 3 Misfeed at Tray 4 Jam T4/158 4 Jam at Fuser Jam F/152 5 Jam at Duplex Jam D/153 6 Jam at Registration Roller Jam RR/154 7

3-16 Phaser 6250 Color Laser Printer Service Manual

Code

Error Messages and Codes Summary Table

Error Type Front Panel Message Help Text/Code

Jam Errors

Jam at Fuser Jam F/152 Jam at Duplex Jam D/153 Jam at Registration Roller Jam RR/154 Misfeed at Tray 1 (MPT) Jam T1/155 Misfeed at Tray 2 Jam T2/156 Misfeed at Tray 3 Jam T3/157 Misfeed at Tray 4 Jam T4/158

Door and Cover Errors

Close Front Door

Consumable/Routine Maintenance Item Errors

Install or Reseat Imaging Unit Replace Imaging Unit or Imaging Unit is at End of Life Install or Reseat Transfer Roller Replace Transfer Roller or Transfer Roller is at End of

Life Install or Reseat Fuser Replace Fuser or Fuser is at End of Life Install or Lock [Y] [M] [C] [K] Toner Cartridge Replace [Y] [M] [C] [K] Toner Cartridge or

[Y] [M] [C] [K] Toner Cartridge Empty Dusty Density Sensor Remove Ribbon From [Y] [M] [C] [K] Toner Cartridge

Tray and Media Errors

Output Tray is Full, Unload Paper Insert Tray [2] or Tray [2] missing Insert Tray [3] [4] or Tray [3] [4] missing Tray [2] Paper is Low Tray [3] [4] Paper is Low Tray 1 (MPT) Out of Paper/Load Paper Tray [2] [3] [4] Out of Paper/Load Paper

Error Messages and Codes 3-17

Error Type Front Panel Message Help Text/Code

Media Mismatch Errors

Wrong Paper Size/Load Tray 1 (MPT) with [size] [type] Wrong Paper Size/Load Tray [2] [3] [4] with [size]

[type]

Fatal Error Messages and Codes

Laser Failure 07, 08, 09, 10, 11 Density Sensor Failure or Low Density Failure 13, 14, 15, 16 Fuser Failure 40, 41, 42, 43, 44,

45, 46, 47 Fuser Fan Failure 50 Rear Fan Failure 51 Generic Fan Failure 52 Engine Firmware Failure 70, 71, 72, 73, 74,

Imaging Unit Firmware Failure 75 Fuser Firmware Failure 76 Controller to Engine Communications Failure 81 Engine NVRAM Failure 83 [Y] [M] [C] [K] Toner Cartridge Failure 86, 87, 88, 89 Replace [Y] [M] [C] [K] Toner Cartridge 90, 91, 92, 93, 96,

Non-Phaser 6250 Fuser 94 Non-Xerox Imaging Unit 95 Environment Sensor Failure 102

77, 78, 79

97, 98, 99

3-18 Phaser 6250 Color Laser Printer Service Manual

Jam Errors

Warning

Jam at Fuser: Jam F

■ Reseat the Fuser.

■ Remove the Fuser and check for any obstructions, media or debris.

■ Cycle printer power.

■ If the problem persists, follow the procedure below.

Troubleshooting Reference

Applicable Parts Wiring and Plug/Jack Map References

Fuser, PL 8.1.1 “Drive Section” on page 10-18 Exit Sensor/Actuator, PL 8.1.7 “Fuser Assembly” on page 10-21 Motor Driver Board, PL 12.1.12 “Map 1” on page 10-6

To avoid the potential of electric shock, ensure the power to the printer is off and the power cord is disconnected from the wall outlet prior to performing Step 2 of the following troubleshooting procedure..

Troubleshooting Procedure

Steps Actions and Questions Yes No

Check the following for evidence of fault or

damage: Exit Actuator & Sensor, PL 8.1.7 Fuser Assembly, PL 8.1.1 Front Cover, PL 1.1.2 Chute Assembly In, PL 5.1.1 Transfer Roller, PL 8.1.12 Imaging Unit, PL 9.1.3

Remove the Fuser and check for broken or

bent pins. Reinstall the Fuser.

Does error recur after the Fuser Assembly has been replaced?

Use service diagnostics to test the Exit

Sensor. Does the sensor function correctly?

Does error recur after the Fuser is replaced Go to Step 6. Complete.

Replace the part(s) concerned.

Replace the parts concerned.

Go to Step 4. Complete.

Go to Step 9. Replace the

Go to Step 2.

Go to Step 3.

Fuser Assembly. Go to Step 5.

Error Messages and Codes 3-19

Troubleshooting Procedure (Continued)

Steps Actions and Questions Yes No

Insert a sheet of paper into the Fuser

Assembly. Verify the voltage on the Fuser Harness P138-3 <=> P138-2 is 0VDC.

Check all pins on the FSR 2 (Fuser)

Harness Assembly PL5.1.10 for continuity.

Check all pins on the Harness Assembly

Front 1A for continuity.

If possible print one sheet of paper.

Does the Fuser Motor Turn? Inspect the gears for damage.

Use service diagnostics to test the Fuser

Motor. Does the Fuser Motor function correctly?

Verify the voltage between P 52-1 <=> P

60-2 on the Motor Driver Board is +24 VDC.

Replace the Fuser Drive Assembly

PL 5.1.18. Does the Fuser Motor function correctly?

Check the DRV 1 Harness for continuity. Replace the

Go to Step 8. Go to Step 7.

Go to Step 8. Replace the

Go to Step 9]. Replace the

Replace the gear(s) if defective.

Replace Engine Control Board, page 8-107.

Go to Step 12. Replace the

Complete Go to Step 13.

Engine Control Board, page 8-107.

Assembly, Harness FSR 2 PL 5.1.9.

Harness Assembly Front 1A, PL 13.1.7.

Go to Step 10.

Go to Step 11.

Motor Driver Board, page 8-101.

Replace the DRV 1 Harness, PL 13.1.2.

3-20 Phaser 6250 Color Laser Printer Service Manual

Jam at Duplex: Jam D

■ Check for any obstructions or debris in the duplexer or paper path.

■ Cycle printer power

■ If the problem persists, follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack Map References

Duplex Sensor, PL 6.1.4 “Drive Section” on page 10-18 Actuator Kit, PL 15.1 “Paper Feed” on page 10-25 Chute Assembly Exit, PL 7.1.7 “Map 1” on page 10-6

Troubleshooting Procedure Table

Steps Actions and Questions Yes No

Check the following for evidence of fault

or damage: Chute Assembly Exit, PL 7.1.7 Duplex Motor Assembly, PL 7.1.8 Duplex Sensor, PL 6.1.4 Duplex Actuator, PL 6.1.5 Chute Assembly Out, PL 6.1.1

Use service diagnostics to test the Duplex

Sensor. Does the sensor function correctly?

Does the printer function correctly after

the Duplex Sensor is replaced? Block the Duplex Sensor and verify the

voltage between J 139-3<=>J 139-2 is 0 VDC.

Check the Front 2 Harness for continuity.

See “Paper Feed” on page 10-25.

Check P 139<=>J 13 on the Front 1A

Harness for continuity. See “Paper Feed” on page 10-25.

If possible, print 1 sheet of paper in

Duplex Mode and check to see if the sheet has reversed in the printer.

Replace the damaged part.

Go to Step 7. Replace the

Complete Go to Step 4.

Go to Step 6. Go to Step 5.

Go to Step 6. Replace the

Replace the Engine Control Board, page 8-107.

Replace the Chute Assembly Exit, page 8-62.

Go to Step 2.

sensor and Go to Step [3].

Front 2 Harness Assembly, PL

6.1.2. Replace the

Assembly, Front 1A, PL 13.1.7.

Go to Step 8.

Error Messages and Codes 3-21

Troubleshooting Procedure Table (Continued)

Steps Actions an d Qu estions Y es No

Use service diagnostics to test the Duplex

Motor. Actuate the Interlock Switch during the test.

Verify the voltage between

P 50-1<=>P 60-2 on the Motor Driver Board is +24 VDC.

Check J 131<=>J 50 on the Duplex Harness for continuity. See “Drive Section” on page 10-18.

Does the error recur after replacing the Duplex Motor?

Check J 12 <=> J 42 pins on the DRV 2 Harness for continuity. See “Drive Section” on page 10-18.

Replace the Chute Assembly Exit, page 8-62.

Go to Step 10. Replace the

Got to Step 11. Replace the

Go to Step 12. Complete

Replace the Engine Control Board, page 8-107.

Go to Step 9.

Motor Driver Board, page 8-101.

Duplex Harness Assembly, PL 6.1.23.

Replace the Assembly, Harness DRV22, PL 13.1.3.

3-22 Phaser 6250 Color Laser Printer Service Manual

Xerox Phaser 6250 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual