Xerox Phaser 6250DT Manual de usuario

Service

Manual

Phaser

Color Laser Printer

6250

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Phaser®6250

Color Laser Printer

Service Manual

Warning

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

As an Energy Star®partner, Xerox Corporation has determined that this product meets the Energy Star

guidelines for energy efficiency. The Energy Star name and logo are registered U.S. marks.

iv Phaser 6250 Color Printer

Service Terms

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.

Note

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.

Caution

A caution indicates an operating or maintenance procedure, practice or condition

that, if not strictly observed, results in damage to, or destruction of, equipment.

Warning

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.

ADC: Automatic Density Control MCU: Engine Control Board

BTR: Bias Transfer Roller NCS: Non-Contact Sensor

CRUM: Customer Replaceable Unit

Monitor PHD: Imaging Unit

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

Service Manual v

Symbols Marked on the Product

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.

30 min.

vi Phaser 6250 Color Printer

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 qualified

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 power 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.

Service Manual vii

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 motions 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).

viii Phaser 6250 Color Printer

Service Safety Summary

General Guidelines

For qualified service personnel only: Refer also to the preceding Power 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 avoid 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.

Service Manual ix

Servicing Electrical Components

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.

Warning

Turning the power off by using the On/Off switch does not completely de-

energize 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.

Warning

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

service procedure.

Servicing Mechanical Components

When servicing mechanical components within the printer, manually rotate drive

assemblies, rollers, and gears.

Warning

Do not try to manually rotate or manually stop the drive assemblies while any

printer motor is running.

Servicing Fuser Components

Warning

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.

S7300-02

S7300-03

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