Epson AcuLaser C8500 User manual

EPSON AcuLaserC8500

Color Laser Page Printer

SEPG00-006

SERVICE MANUAL

SERVICE MANUALSERVICE MANUAL

SERVICE MANUAL

Notice

mechanical, photocopying, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.

All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would

greatly appreciate being informed of them.

The contents of this manual are subject to change without notice.

All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would

greatly appreciate being informed of them.

The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences

thereof.

EPSON is a registered trademark of SEIKO EPSON CORPORATION.

General Notice: Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their

respective owners. EPSON disclaims any and all rights in those marks.

PRECAUTIONS

Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment.

DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in

performing procedures preceded by DANGER Headings.

WARNING Signals a precaution which, if ignored, could result in damage to equipment.

The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.

DANGER

1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY

MAINTENANCE OR REPAIR PROCEDURES.

2. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED

FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK.

3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL

INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON

POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING

1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN.

2. MAKE CERTAIN THAT THE SOURCE VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/

RATING PLATE. IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT

CONNECT IT TO THE POWER SOURCE.

3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR

REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.

4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS

ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF

SECOND-SOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE

EPSON WARRANTY.

About this manual

This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the EPSON AcuLaser

C8500. The instructions and procedures included herein are intended for the experienced repair technicians, and attention should be given to the

precautions on the preceding page.

Manual Configuration

This manual consists of six chapters and Appendix.

CHAPTER 1. PRODUCT DESCRIPTIONS

Provides a general overview and specifications of the

product.

CHAPTER 2. OPERATING PRINCIPLES

Describes the theory of electrical and mechanical

operations of the product.

CHAPTER 3. DISASSEMBLY / ASSEMBLY AND ADJUSTMENT

Describes the step-by-step procedures for

disassembling/assembling and adjusting the product.

CHAPTER 4. DIAGNOSTICS

Provides Epson-approved methods for diagnostics.

CHAPTER 5. TROUBLESHOOTING

Provides the step-by-step procedures for

troubleshooting.

CHAPTER 6. MAINTENANCE

Provides preventive maintenance procedures and the

lists of Epson-approved lubricants and adhesives

required for servicing the product.

APPENDIX Provides the following additional information for

reference:

• Connector pin assignments

• Electric circuit boards components layout

• Exploded diagram

• Electrical circuit boards schematics

Symbols Used in this Manual

Various symbols are used throughout this manual either to provide

additional information on a specific topic or to warn of possible danger

present during a procedure or an action. Be aware of all symbols when

they are used, and always read NOTE, CAUTION, or WARNING

messages.

Indicates an operating or maintenance procedure, practice

or condition that, if not strictly observed, could result in

injury or loss of life.

Indicates an operating or maintenance procedure, practice,

or condition that, if not strictly observed, could result in

damage to, or destruction of, equipment.

May indicate an operating or maintenance procedure,

practice or condition that is necessary to accomplish a task

efficiently. It may also provide additional information that is

related to a specific subject, or comment on the results

achieved through a previous action.

W ARNING

CAUTION

CHECK

PO INT

NOTE

Abbreviation

ADC = Automatic Density Control

AG = Analog Ground

ASSY = Assembly

AUX. = Auxiliary

B/W = Black and White

BCR = Bias Charge Roll

Bk = Black

BK = Black

BTR = Bias Transfer Roll

BUR = Back Up Roll

C = Cyan

CART. = Cartridge

CCW = Counterclockwise

CL. = Clutch

CLN = Cleaning (or Cleaner)

CLK = Clock

CONT. = Controller

CR = Charge Roll

CRU = Customer Replaceable Unit

CRUM = CRU Monitor

CW = Clockwise

DB = Developing Bias

DEVE. = Developer

DIAG. = Diagnostic

dpi = dots per inch

DTS = Detach Saw

ELEC. = Electric

EP = Electrophotography

FDR = Feeder

FG = Frame Ground

FRU = Field Replaceable Unit

GND = Ground

H/R = Heat Roll

Hex = Hexadecimal

HVPS = High Voltage Power Supply

I/F = Interface

IBT = Intermediate Belt Transfer

ID = Image Density (or Identification)

L = Left

L/H = Left Hand

L/P = Low Paper

LD = Laser Diode

LEF = Long Edge Feed

LVPS = Low Voltage Power Supply

M = Magenta

MAG. = Magnetic

MCU = Machine Control Unit

MECH. = Mechanical

MOT. = Motor

MSI = Multi Sheet Inserter

N/F = Normal Force

N/P = No Paper

NVM = Non Volatile Memory

O/H = Option Hinge

OHP = Overhead Projector

(In this manual, OHP means OHP film)

OPC = Organic Photo Conductor

P/H = Paper Handling

P/R = Pressure Roll

PCDC = Pixel Count Dispense Control

Pixel = Picture Cell

PPM = Prints Per Minute

PV = Print Volume

PWB = Printed Wiring Board

R = Right

R/H = Right Hand

REGI. = Registration

ROS = Raster Output Scanner

RTN = Return

SEF = Short Edge Feed

SG = Signal Ground

SNR = Sensor

SOL. = Solenoid

SOS = Start Of Scan

SPI = Scans Per Inch

SYNC. = Synchronous

TC = Toner Concentration

TEMP. = Temperature

TR = Transfer

TRANS. = Transport

WDD = Wide Range Dynamic Damper

XERO. = Xerographic

Y = Yellow

YMCBk = Yellow, Magenta, Cyan, Black

Safety Information

To prevent accidents during a maintenance procedure, strictly observe

the Warnings and Cautions. Do not do anything that is dangerous or not

within the scope of this document.

Do not do anything that is dangerous even if not specifically described

in this manual. In addition to the descriptions below and those given in

this manual, there are many situations and circumstances that are

dangerous. Be aware of these when you are working with the printer.

Power Supply

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 when the power is applied, be aware of the potential for electrical

shock and do all tasks by following the procedures in this manual.

W ARNING

Do not touch any live part unless you are instructed to

do so by a service procedure. The LVPS power supply

switch/inlet part is live even when the power switch has

been turned off. Do not touch any live part.

Mechanical Components

If you service a driving assembly (e.g., gears), first turn off the power

and unplug the power cord. Then manually rotate the assembly.

Safety Components

The printer is equipped with safety components (e.g., interlock

switches, fuses, thermostat) and safety switches for protecting users

and service personnel from injury and the equipment from damage.

The printer has two interlock switches, two safety switches and two

interlock connectors that serve as the main safety mechanism.

Front Cover Switch R

This switch is turned off when the Front Cover Assembly is opened.

It cuts off the power supply (24VDC, 5VDC-LD) from the power

supply unit to stop all operations and disconnects the output (5VDC-

LD) circuit from the power supply and stops the laser beam

emission.

This switch consists of the following two switches:

A switch that cuts off the power supply (24VDC, 5VDC-LD) to

the control circuits and related parts.

A switch that directly cuts off the power supply circuit (5VDC-LD)

to the laser beam output circuit.

Front Cover Switch L

This is a safety switch. This switch is turned off when the Front

Cover Assembly is opened, causing the printer without control units

to stop operating.

Top Cover Switch

This is an interlock switch that directly cuts off the power supply

(5VDC-LD) circuit to the laser beam output circuit. This switch is

turned off when the Top Cover Assembly is removed, cutting off the

output (5VDC-LD) circuit from the power supply unit and stopping

the laser beam emission.

W ARNING

Do not touch the driving part (e.g., gears) while the

assembly (printer) is being driven.

Exit Chute Switch

This switch is a safety switch. This switch is turned off when the Exit

Upper Assembly (the cover on the upper left side of the printer) is

opened.

P/J91 (Connector that connects the Main Harness Assembly and

Registration Harness Assembly)

This is an interlock connector that cuts off the power supply

(24VDC, 5VDC-LD) to the control circuit and related parts.

This connector is disconnected when the Main P/H Assembly (pull-

out type unit on the right side of the printer) is pulled out, cutting off

the output (24VDC, 5VDC-LD) from the power supply and stopping

the printer operation without control units.

P/J71 (Connector that connects the Fuser Connector and Fuser

Harness Assembly)

This is an interlock connector that cuts off the power supply

(24VDC, 5VDC-LD) to the control circuit and related parts.

This connector is disconnected when the Fuser Assembly (pull-out

type unit on the left side of the printer) is pulled out, cutting off the

output (24VDC, 5VDC-LD) from the power supply and stopping the

printer operation without control units.

Laser Beam

The printer has two interlock switches: the Front Cover Switch R and

the Top Cover Switch. The purpose of these switches is to turn off the

laser beam emission if any of the printer covers have been opened; this

protects the user or service personnel from exposure to the laser beam

from the ROS Assembly.

A laser beam may be emitted during a maintenance operation. Do not

turn on these interlock switches simultaneously under any

circumstances except in a normal operation.

NOTE:The laser beam has a narrower frequency band and more

coherent phases than any other light (sunlight, electric light).

It has excellent monochromaticity and convergence. A thin

laser beam reaches long distances. Because of its

convergence characteristic, the laser beam converges into

one point, causing high density and high temperature. A

laser beam is harmful to the human body.

NOTE:The laser beam in this printer is invisible.

W ARNING

Do not expose yourself to the laser beam to prevent

injury (blindness).

Do not open the cover that has the laser beam

warning label.

If you disassemble or assemble the printer, turn off

the power.

If you need to work on the printer with power applied,

strictly follow the instructions in this manual.

If you have to activate the printer while pressing the

Front Cover Switch R by hand or with a tool, remove

the Top Cover. (Do not turn on these interlock

switches simultaneously under any circumstances

except in a normal operation.)

Understand how the laser beam functions and take

maximum precautions not to injure yourself or anyone

around you.

High Temperature Assembly

To prevent you from becoming injured or burned, do the following:

Before working with a high temperature Assembly (e.g., Fuser

Assembly), turn off the power, unplug the power cord and wait until it

cools down.

Parts

To prevent you from becoming injured, keep the following in mind:

When handling heavy parts (including the printer itself), use good

posture to protect your back whenever you lift, move or place parts.

Be careful not to injure yourself with the sharp edges of the parts.

Do not work with wet or oily hands-you may drop a part or injure

yourself. Dry your hands first.

When pulling out a part (including a harness), do not use too much

force. Pull out the part carefully and slowly step by step.

W ARNING

The high temperature Assembly is very hot

immediately after any printer operations. Wait at least

40 minutes before you start working on the printer.

W ARNING

Do not lift, move or place heavy parts in a body posture

that is likely to cause injury to yourself or cause the

part to drop.

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