Epson EPL-N3000 User manual

EPSON EPL-N3000
AcuLaserM4000N
A4 Monochrome Laser Printer
SERVICE MANUAL
SEPG03004
Confidential

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Notice:
The purpose of this manual is to provide the product knowledge and the technical information required for repair or maintenance of EPSON EPL-N3000/AcuLaser
M4000N.
All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic,
mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
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.
Copyright © SEIKO EPSON CORPORATION 2008.
Imaging Products CS, PL & Environmental Management

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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.
4. WHEN DISASSEMBLING OR ASSEMBLING THE PRODUCT, MAKE SURE TO WEAR GLOVES TO AVOID INJURY FROM METAL PARTS
WITH SHARP EDGES.
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 NON-APPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON
WARRANTY.
6. WHEN AIR DUSTRE IS USED ON THE REPAIR AND THE MAINTENANCE WORK, THE USE OF THE AIR DUSTER PRODUCTS
CONTAINING THE INFLAMMABLE GAS IS PROHIBITED.

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About This Manual
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the printer. 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.TROUBLESHOOTING
Describes the step-by-step procedures for the troubleshooting.
CHAPTER 4.DISASSEMBLY / ASSEMBLY
Describes the step-by-step procedures for disassembling and
assembling the product.
CHAPTER 5.ADJUSTMENT
Provides Epson-approved methods for adjustment.
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:
• Connectors
• Wiring Diagrams and Signal Information
• Control Panel Special Operations
• Firmware Update
• Information Sheet
• Exploded Diagrams
• ASP List (Parts List)
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 is necessary to keep the product’s quality.
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.
Indicates an operating or maintenance procedure, practice or
condition that, if not strictly observed, could result in injury or loss
of life.

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Abbreviation
This manual uses original abbreviations, in addition to general abbreviations.
Typical abbreviations are as follows:
AG ...............................................Analog Ground
ASSY....................................................Assembly
B/W............................................ Black and White
BCR..........................................Bias Charge Roll
Bk ............................................................... Black
BTR .........................................Bias Transfer Roll
BUR................................................ Back Up Roll
CCW.................................... Counter Clock Wise
CRU.........................Customer Replaceable Unit
CRUM............................................. CRU Monitor
CST .......................................................Cassette
CW.....................................................Clock Wise
DIAG................................................... Diagnostic
dpi....................................................dots per inch
DTS ..................................................Detack Saw
ELEC....................................................... Electric
EP.........................................Electrophotography
FDR..........................................................Feeder
FG.................................................Frame Ground
GND......................................................... Ground
H/R ....................................................... Heat Roll
Hex................................................. Hexadecimal
HVPS....................... High Voltage Power Supply
I/F ..........................................................Interface
I/L............................................................Interlock
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
MAG......................................................Magnetic
MCU...................................Machine Control Unit
MOT........................................................... Motor
N/P....................................................... No Paper
NVM...................................Non Volatile Memory
OCT......................................... Offset Catch Tray
OHP ..................................... Overhead Projector
(In this manual, OHP means OHP film)
OPT..................................... Optional Paper Tray
P/H..............................................Paper Handling
P/R.................................................Pressure Roll
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
SSI .....................................Single Sheet Inserter
SW ............................................................Switch
TEMP..............................................Temperature
TR ..........................................................Transfer
TRANS................................................. Transport
XERO............................................... Xerographic

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Safety Information
To prevent accidents during a maintenance procedure, strictly observe the Warnings and Cautions and never depart from the instructions given in 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.
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.
W ARNING
Do not touch any live part unless you are instructed to do so by a
service procedure. The power supply switch/inlet part is live even
when the power switch has been turned off. Do not touch any live
part.
W ARNING
Do not touch the driving part (e.g., gears) while the assembly
(printer) is being driven.
JG0102AA

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Laser Beam
This printer incorporates the laser radiation unit (ROS ASSY) of Class IIIb as specified
in IEC60825-1.
Maximum average electric power: 10 mW
Wavelength: 770 ~ 790 nm
To prevent the laser radiation unit from emitting the laser beam unexpectedly, this
printer is equipped with a switch (INTERLOCK S/W 5V) which physically cuts off the
power to the laser beam output circuit. The interlock switch turns off the printer when
the top cover is opened.
W ARNING
Take great care not to expose your naked eyes to the laser
beam; otherwise, you can lose your eyesight.
Never turn on the interlock switch forcibly without turning it
on by normal operation; otherwise, a laser beam can be emitted
unexpectedly during a maintenance operation.
Never disassemble any part or open any cover to which a
warning label about laser beam is affixed.
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.
Understand how the laser beam functions and take maximum
precautions not to injure yourself or anyone around you.
CHECK
P O I N T
The laser beam has a narrower frequency band and more
coherent phases than any other light (sunlight, electric light).
The beam has excellent monochromaticity and convergence,
thus it reaches long distances. Because of these characteristics,
the laser beam converges into one point, causing high density
and high temperature. Therefore, a laser beam is harmful to
the human body.
The laser beam in this printer is invisible.
ROS ASSY
JG0104E
A
Warning Label

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High Temperature Assembly
To prevent you from becoming injured or burned, do the following: Before working
with a high temperature assembly (e.g., FUSER ASSY), be sure to turn off the power,
unplug the power cord and wait until it cools down adequately.
Ozone
Because of the printing principle of laser printers, this machine emits a very small
amount of ozone in the process of printing. (The exhaust air may smell of ozone.) This
printer generates only a very small amount of ozone that never exceeds the safety
permissible value (0.1 ppm / 0.2 mg/m3) in the normal work environment. Avoid
operating the printer under any of the following conditions:
Any ambient conditions other than specified for use of this printer
Use of two or more laser printers in a small room
Use in a place where sufficient ventilation is not available
Especially, continuous operation for an extended period of time under any of the
above-mentioned conditions
C A U T I O N
The high temperature assembly is very hot immediately after any
printer operation. Wait at least 40 minutes, until the printer cools
down adequately.
JG0105E
A
FUSER ASSY Warning Label

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Warning/Caution Labels
Warning labels and caution labels are affixed to this printer for accident prevention.
Laser Product Identification Marking
This printer is a Class 1 laser product as specified in IEC60825-1. For
identification, a label as shown below is affixed to the printer body.
Warning Label About Laser Beam
Stuck on the top of the laser beam emitting unit (ROS ASSY) to warn the
maintenance personnel of danger of exposure to the laser beam.
Caution Label About High-temperature Surface
Stuck on the side front wall of the FUSER ASSY, which becomes hot, in order to
warn the user of danger of suffering a burn.
Parts
To prevent you from becoming injured, keep the following in mind:
Take due care in handling the printer, which is very heavy (main unit: 19.5 kg).
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.
Consumables
Understand the following explanation and handle the consumables carefully.
Some parts may cause a particulate explosion or fire if handled improperly. Do not
handle these parts near fire or throw into a fire.
Some materials, especially toner, may cause bodily injury. Do not swallow or
inhale such materials or allow them to come in contact with the eyes. Help to
protect those around you and follow the prohibitions against swallowing or
inhaling such materials. Be careful to protect the eyes at all times.
Place a sheet inside or under the printer so that the floor or workbench is protected.
If the Developer or Fuser Oil gets on your clothing, dry it with a cloth and wash
with clean water.
Improper Printer Use
Modifying, revising, tampering with the printer, especially to the safety mechanism, is
strictly prohibited in all circumstances.
CHECK
P O I N T
In maintenance work, check that the labels are free from peeling
and soiling.

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Safety System Outline Diagram
The following diagram shows outline of the safety system of this printer. For names and other details of signal lines, refer to “Appendix (p.405)”.
EPL-N3000
<PWBA FEEDER550>
Option 550
Feeder Option 550
Feeder Option
Duplex
<PWBA FEEDER550>
<PWBA DUPLEX>
Option
OCT
<PWBA OCT>
<HVPS/MCU>
LDD
<ROS ASSY>
<INTERLOCK S/W 5V>
<INTERLOCK S/W 24V> <INTERLOCK
S/W REAR>
HVPS Circuit
<PWBA EXIT MOTOR>
<MOTOR ASSY EXIT>
<MAIN MOTOR>
/HEAT ON Short
FAN ALARM
FAN ALARM
/HEAT ON Long
24VDC AFT
24VDC AFT
24VDC AFT
A,B,/A,/B, 24VDC AFT
<FAN MAIN> <FAN SUB>
Heater Rod Long Heater Rod Short
JG6126EA
<SWITCH DUPLEX>
<SW REAR
COVER>
<SWITCH I/LASSY>
INTERLOCK BEF
<Interlock S/W 5VR>
TEMP.
POWER
SWITCH (Feed Back) Out Put
Control
Primary
Control
Trans-
former
<Interlock S/W Front R>
<FUSER ASSY>