Xerox DocuPrint N4525 User 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
operating instructions unless you are qualified
to do so.
This printing: April 5, 2001
Rev. NEW
721P58090
DOCUPRINT®N4525
NETWORK LASER PRINTER
Service Quick Reference Guide
Volume 1 — Print Engine

Copyright 2001 Xerox Corporation. Printed in the United States of America. All
rights reserved.
Contents of this publication may not be reproduced in any form without
permission of Xerox, Inc.
Xerox, and all product names and product numbers mentioned in this
publication are trademarks.
Other marks are trademarks or registered trademarks of the companies with
which they are associated.
RJ/MP
sn/ck

Users safety summary
Terms in manual: Various terms are used throughout this manual to either
provide additional information on a specific topic or to warn of possible danger
that might be present during a procedure or action. Be aware of all symbols and
terms when they are used, and always read NOTE, CAUTION and WARNING
messages.
Terms on product:
Power source: For 110 VAC printers, Do not apply more than 130 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 250 volts RMS between the supply conductors or between
either supply conductor and ground. Use only the specified power cord and
connector. Refer to a qualified service technician for changes to the cord or
connector.
WARNING: If the product loses the ground connection, usage of knobs and
controls (and other conductive parts) can cause an electrical shock.
NOTE:A NOTE may indicate an operating or maintenance
procedure, practice or condition that is necessary to
efficiently accomplish a task.
A NOTE may also 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, could result in damage to, or destruction of,
equipment.
WARNING:A WARNING indicates an operating, or maintenance
procedure, practice or condition that, if not strictly
observed, could result in injury or loss of life.
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.

Power Supply and 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.
Do not touch any electrical component unless you are instructed to do so by a
service procedure.
Mechanical components: Manually rotate drive assemblies to inspect
sprockets and gears.
Do not try to manually rotate or manually stop the drive assemblies while any
printer motor is running
Laser Components
WARNING:This printer generates a laser beam as part of the printing process.
The laser beam is a concentrated narrow beam of light that
produces extreme heat at its focal point. The laser beam in this
printer is invisible. Although you cannot see the beam, it can still
cause severe damage. Direct eye exposure to the laser beam may
cause eye injury or blindness.
To avoid permanent eye damage, follow these directions:
 Before starting any service procedure, switch off the printer power and
unplug the power cord from the AC wall outlet.
 Do not disassemble the Raster Output Scanner Assembly (laser
scanner) or any laser component that displays a Laser Warning Sticker.
 Use caution when you are working around the Raster Output Scanner
Assembly or when you are performing laser related troubleshooting or
repair procedures.
 Never place a mirror or a reflective tool or object in the laser beam path.
 Do not disassemble the printer in such a way that the laser beam can
exit the print engine during a print cycle.
S4525-01
S4525-02

Fuser Components
WARNING:This printer uses heat to fuse the toner image to a sheet of paper.
The Fuser Assembly is very hot. Switch off printer power and wait at least 30
minutes for the Fuser to cool before you attempt to service the Fuser Assembly or
adjacent components.
Safety Components: Make sure covers and panel are in place and that all
interlock switches are all functioning correctly after you have completed a printer
service call. If you bypass, or cheat, an interlock switch during a service call, use
extreme caution when working on or around the printer.
Warning Labels: Throughout the printer, warning labels are displayed on
potentially dangerous components. When you service the printer, check to make
certain that all warning labels are in place.
Most importantly, read and obey all posted warning labels.
WARNING:Turning the power off using the On/Off switch does not de-energize
the printer. You must remove the power cord to disconnect the
printer from the main power source. Keep the power cord accessible
for removal in case of an emergency.
Safety instructions: Read all installation instructions carefully before you plug
the product into a power source.
Care of product: Disconnect the power plug by pulling the plug, not the cord.
 Disconnect the power plug if the power cord or plug is frayed or otherwise
damaged,
 Or if any liquid or foreign material is spilled into the case,
 Or if the printer is exposed to any excess moisture,
 Or if the printer is dropped or damaged,
 Or if you suspect that the product needs servicing or repair,
 And whenever you clean the product.
Ground the product: Plug the three-wire power cord (with grounding prong)
into grounded AC outlets only. If necessary, contact a licensed electrician to
install a properly grounded outlet.

Service Safety Summary
For qualified service personnel only: Refer also to the preceding Users Safety
Summary.
Do not service 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, soldering 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 250 volts rms between the supply conductors or between
wither supply conductor and ground. A protective ground connection by way of
the grounding conductor in the power cord is essential for safe operation.
This product is certified under IEC 825 as a Class 1 Laser Product.
CLASS 1 LASER PRODUCT
The DocuPrint®N4525 Network 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.
The laser and output of the laser scanner unit produces a beam that, if looked
into, could cause eye damage. Service procedures must be followed exactly as
written without change.
When servicing the machine or laser module, follow the procedures specified in
the manual and there will be no hazards from the laser.
Laser (FDA): Any laser label visible to service must be reproduced in the service
manual with location shown or indicated. Safe working procedures and clear
warnings concerning precautions to avoid possible exposure must also be
included.

The Laser contained in the DocuPrint®N4525 Network Laser Printer meets the
following standard: Laser class 3B, maximum 5mW, wavelength 780nm.
The following LASER symbol will be displayed at the start of any procedure where
possible exposure to the laser beam exists.
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT

Federal Communications Commission Compliance
This equipment has been tested and found to comply with the limits set for a
Class B digital device, as stated in Part 15 of the FCC rules. These limits are
designed to provide reasonable protection against harmful interference in a
commercial installation. This equipment generates, uses, and may radiate radio
frequency energy. If not installed and used in accordance with the instructions
provided, this equipment may cause disruptive interference to nearby radio and
television communications. Even if the equipment is installed according to the
instructions, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause disruptive interference to nearby radio
and television reception, switch the equipment off to determine if it is the true
cause of the interference. If the equipment is the cause of the interference, the
user should try to minimize the interference by taking one or more of the
following courses of action:
NOTE: Installation of the Finisher and/or the Token Ring Interface results in an
FCC classification change to Class A.
 Either re–orient or relocate the radio/television receiving antenna.
 Increase the separation between the equipment and the radio/television
receiver.
 Connect the equipment to an AC outlet that is not on the same circuit as the
radio/television receiver.
 If the previous solutions fail to bring results, you should consult either your
equipment dealer or an experienced radio/television technician.
For more information on interference, refer to the Federal Communications
Commission’s booklet “How to Identify and Resolve Radio-TV Interference
Problems”. This booklet is available from the U.S. Government Printing Office,
Washington D.C. 20402, Stock No. 004-000-00345-4.

Canadian Notice
This digital apparatus does not exceed the Class B limits for radio noise
emissions from digital apparatus as described in the radio interference
regulations of the Canadian Department of Communications.
NOTE: Installation of the Finisher and/or the Token Ring Interface results in a
classification change to Class A.
Avis Canadien
Cet appareil numerique est conforme aux limites émission de bruits
radioélectriques pour les appareils de classe B stipulés das le réglement sur le
brouillage radioéletrique du Ministére des Communcations du Canada.
European Notice
This equipment was tested and is determined to be compliant with VDE
requirements for a Class B device.
Hinweis
Hiermit wird bescheinigt, dass der Babe Laserdrucker, in bereinstimmung mit
den Betimmunngen der Vfg 104ß 984 funkenstört ist. Der Deutschen
Bundespost wurde das Inverkehrbringen dieses Gertëes angqeigt und die
Berechtigung zur berprufung der Serie auf Einhaltung der Bestimmungen
eingeräumt.

Manual Organization
This Service Quick Reference Guide (QRG) is divided into two volumes.
Book I
Book I of the QRG contains technical information for the N4525 Print Engine
(Volume 1), as well as complete Error Code and Repair Analysis Procedures
(RAPs) for the Print Engine and all options for the printer. Information specific to
each option is repeated in that option’s volume.
NOTE: All pages, figures, tables, RAPs, RRPs (Remove and Replace Procedures)
and Parts List numbers are preceded by a “dash” number, indicating the volume
number for that module according to the following legend
Volume 1 - Print Engine
Frontis - Introductory, Safety and Regulatory Information
This is the section you are reading at this moment. It contains important safety
information regarding technical components, regulatory agency requirements
and information about this manual, which is applicable to both Books I and II.
Section 1 - General Information
This section contains a general overview of the printer and basic information
regarding RAM, print engine illustrations (major assembly locations, sensor
locations, general views, etc.), printer specifications and vital information
regarding service call procedures.
Section 2 - Error Codes and Messages
Information regarding certain Error Codes and Messages for conditions the user
may not be aware of, or conditions that exist which may not yet be made
apparent by printer performance or by image quality. Also contained in this
section is a vital error table which references Repair Analysis Procedures (RAPs)
for the Printer and all options, and referring the reader to appropriate sections in
each option manual supplement. In addition, there is additional, but valuable,
information on how to use the Repair Analysis Procedures for the Print Engine
and the options.
Volume Module
1Print Engine
2High Capacity Feeder
3Duplex Unit
4Envelope Feeder
5Face Up Bin
6Finisher