Xerox 3400N - Phaser B/W Laser Printer 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.
First printing: June 2001
071-0826-00
XEROX PhaserTM 3400
Personal Laser Printer
Service Guide



CAUTION Conditions that can result in damage to the product.
WARNING Conditions that can result in personal injury or loss of life.
For 110 VAC printers, do not apply more than 135 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 and connector. Refer to a qualified service
technician for changes to the cord or connector.
 Avoid electric shock by contacting a qualified service
technician to replace fuses inside the product. Do not operate without the covers and
panels properly installed. Do not operate in an atmosphere of explosive gases.
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 mains. Keep the power cord accessible for removal
in case of an emergency.
 Read all installation instructions carefully before you plug the
product into a power source.
 
CAUTION A personal injury hazard exists that may not be apparent. For
example, a panel may cover the hazardous area. Also applies to a
hazard to property including the product itself.
DANGER A personal injury hazard exists in the area where you see the sign.
 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, if
you spill anything into the case, if product is exposed to any excess moisture, if product is
dropped or damaged, if you suspect that the product needs servicing or repair, and
whenever you clean 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.

Read each Caution Carefully:
■Do not use the printer near water or in inclement weather.
■Do not place the printer on any unstable surface; the product may fall causing
serious damage to the product. Select a work surface that is large enough to
hold the printer.
■Slots and openings in the cabinet are provided for ventilation. Do not block
or cover any of these openings. Do not place the printer in an enclosure
unless the enclosure provides adequate ventilation.
■Never spill liquid of any kind on the printer.
■Do not place the printer in a location where someone may trip over the cords.
■Operate this printer using the power source (110 V or 220 V) indicated on the
marking label.
■If you need to use an extension power cord with this printer, make sure that it
uses a three-wire grounded cord and that the total ampere ratings for all of
the products using the extension do not exceed the extension cord ampere
rating.
■Do not allow anything to rest on the power cord or interface cables.
■Unplug the printer from the wall before cleaning. Do not use liquid cleaners
or aerosol sprays. Use a damp cloth for cleaning.
■Do not touch the surface of the photo-sensitive drum, as marks or scratches
may impair print quality.
■Do not expose the drum to direct light for extended periods of time.
Symbols as marked on product:
DANGER high voltage:
Protective ground (earth) terminal:
Use caution. Refer to the manual(s) for information:

Service Safety Summary
For qualified service personnel only: Refer also to the preceding User Safety
Summary.
Note: Requirements for the AC power are on the label affixed to the rear
of the printer. Check the AC voltage rating requirement before use.
■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.
■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 than 264 Volts rms 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. For 110 VAC printers, do not apply more than 135 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 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.
■Avoid spilling toner inside the machine: Do not turn the printer over or on its
side before removing the Printer Cartridge.
■When replacing parts: Use only the same part as the original. Replacing parts
with a second vendor’s part may cause faulty operation.

This product is certified under IEC 825 as a Class 1 Laser Product.
CLASS 1 LASER PRODUCT
The Xerox Phaser 3400 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.
Never operate and service the printer with the protective cover removed from
the Laser Assembly. 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.

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:
■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.
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.

ESD Precautions
Some semiconductor devices are easily damaged from static electricity. These
components are Electrostatically Sensitive Devices (ESDs); examples include
integrated circuits (ICs), Large-Scale Integrated circuits (LSIs), some field-effect
transistors and semiconductor chip components. The following techniques will
reduce the occurrence of component damage caused by static electricity:
Caution: 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 by touching a known earth
ground. Alternatively, wear a discharging wrist strap device. (Be sure to
remove the strap before applying power to the unit under test to avoid
potential shock.)
■After removing an ESD-equipped assembly, place it on a conductive surface
such as aluminum foil to prevent accumulation of an electrostatic charge.
■Do not use freon-propelled chemicals. These can generate electrical charges
sufficient to damage ESDs.
■Use only a ground-tip soldering iron when soldering or desoldering ESDs.
■Use only an anti-static solder removal device. Some solder removal devices are
not rated as “anti-static”; these can accumulate a sufficient electrical charge to
damage ESDs.
■Do not remove a replacement ESD from its protective package until you are
ready to install it. Most replacement ESDs are packaged with leads that are
electrically shorted together by conductive foam, aluminum foil or other
conductive materials.
■Immediately before removing the protective material from the leads of a
replacement ESD, touch the protective material to the chassis or circuit
assembly into which the device will be installed.
■Minimize body motions when handling unpackaged replacement ESDs.
Motion such as your clothes brushing together, or lifting a foot from a carpeted
floor can generate enough static electricity to damage an ESD.
■Handle ICs and EPROMs carefully to avoid bending a pin.
■Pay attention to the direction of parts when mounting or inserting them on a
PCB.
■Components can be permanently damaged if heated for longer than necessary
while soldering. All components are susceptible to heat damage.

Table of Contents i
Contents
User safety summary iii
Service Safety Summary v
ESD Precautions ix
General Information 1
Organization of this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Phaser 3400 Printer Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Parts of the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Front Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Paper Input Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Supported Paper and Print Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Printer Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Memory Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Xerox Supplies and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Remote Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Network Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Printing a Cleaning or Configuration Page 17
Repair Analysis Procedures (RAPs) 19
Using Repair Analysis Procedure Tables . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Service Call Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
RAP 1 Entry-Level Procedure and Printer
Operation Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Print-Image Quality Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
RAP 2 Print Image-Quality Problems . . . . . . . . . . . . . . . . . . . . . . . . . 26
RAP 3 Paper Jams and Paper Feed Problems . . . . . . . . . . . . . . . . . . . 30
Printer Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Removal and Replacement Procedures (RRPs) 37
Removal and Replacement Procedures (RRPs) . . . . . . . . . . . . . . . . . . . . . 37
RRP - 1 Main Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
RRP - 2 Multi-Purpose Feeder Cover (MPF) . . . . . . . . . . . . . . . . . . .40
RRP - 3 Print Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
RRP - 4 Pick-Up Roll Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
RRP - 5 Multi-Purpose Feeder (MPF) Assembly . . . . . . . . . . . . . . . .44
RRP - 6 Fuser Exit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
RRP - 7 Fuser Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
RRP - 8 Main Drive Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . .47

ii Xerox Phaser 3400 Printer Service Guide
RRP - 9 Bias Transfer Roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
RRP - 10 Print Engine Controller Board . . . . . . . . . . . . . . . . . . . . . . 49
RRP - 11 System Controller Board . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
RRP - 12 Laser Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
RRP - 13 High Voltage Power Supply Board (HVPS) . . . . . . . . . . . . 52
RRP - 14 Installing Additional Memory . . . . . . . . . . . . . . . . . . . . . . . 53
RRP - 15 Installing the Optional Network Card . . . . . . . . . . . . . . . . . 54
RRP - 16 Installing the Optional 550-Sheet Lower Paper Tray 2 . . . 55
RRP - 17 Repacking Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
FRU Parts List 57
PL 1 - Main Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
PL 2 - Covers and Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
PL 3 - Main Boards, Optional NIC Card and Memory Expansion . . . . . . 62
PL 4 - Optional Paper Trays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
PL 5 - Fuser Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
PL 6 - Main Drive Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
PL 7 - Pick-Up Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
PL 8 - Multi-Purpose Feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
PL 9 - Exit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Parts List Summary Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

General Information 1
General Information
The Xerox PhaserTM 3400 Service Quick Reference Guide is used for repairing,
troubleshooting and maintaining the printer. This manual covers specific procedures,
Repair Analysis Procedures, Troubleshooting, Removal and Replacement Procedures and
FRU Parts List.
 !"
P3400-001

2 Xerox Phaser 3400 Printer Service Guide
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%
This section contains a general overview of the printer and basic information regarding
printer base memory, specifications, media, electrical and regulatory information. For
information on the Theory of Operation and Wiring diagrams for the Xerox Phaser 3400
printer please refer to the Service web site.
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This section contains instructions for printing a cleaning and configuration page.
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This section contains a Service Flowchart for handling Repair Analysis Procedures for the
printer and vital information regarding service call procedures. Basic troubleshooting for
print quality, media and paper jams and printer operation problems are also covered.
+&&,&(&&)
This section provides procedures and illustrations for removing and replacing Field
Replaceable Units (FRUs) within the printer.
+&-
This section contains the parts list for all Field Replaceable Units and Consumer
Replaceable Consumables. There are exploded views of the FRUs as well as specific part
numbers for items available.

General Information 3
 ,,
■The Xerox Phaser 3400 is a desktop laser printer capable of print speeds of
17 ppm (page per minute), on standard 8.5 x 11 and 16 ppm for A4, with a
native resolution of 600 x 600 dpi (dots per inch). Using Image Enhancement
technology, 1200 x 1200 dpi can be achieved with PCL6 and
PostScript Level 3 drivers.
■The Xerox Phaser 3400 printer operates at 110 V at 60 Hz or 220 V at 50 Hz,
using approximately 300 Watts in Print Mode, 70 Watts in Standby and
20 Watts in power saver mode.
■The system controller board contains a 133-MHz, 32-bit RISC processor. The
standard memory capacity is 16 Mbytes, expandable to 80 Mbytes by adding
an additional DIMM. The board contains flash ROM that allows for easy
updating of the firmware.
■The Xerox Phaser 3400 printer comes standard with PCL5e and PCL6
emulation with 45 scalable fonts and 1 PCL bit-mapped font. The printer has
PostScript Level 3 and Epson FX80 emulations.
■The Print Engine Controller Board generates all the voltages for the printer and
controls the individual printer components.
■The Laser Assembly provides the exposure function for the xerographic
procedure.
■The Print Cartridge is a Customer Replaceable Consumable (CRC).
■The Fuser Assembly contains the entire fuser subsystem and is a field
replaceable unit (FRU).
■The printer can handle various types of media including paper, envelopes,
transparencies and labels.
■Remote Control Panel software is provided with the Phaser 3400 printer. This
software allows the user to modify the settings of the printer.
■The printer comes standard with one 550-sheet paper tray, a face-down output
tray, a face-up output tray and a multi-purpose feeder.
■Options available for the Xerox Phaser 3400 printer:
■550-Sheet Lower Paper Feeder (called out as Paper Tray 2 throughout this
manual).
■SDRAM DIMM memory upgrade
■Network Interface Card

4 Xerox Phaser 3400 Printer Service Guide
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! 
$ ,
&, "
P3400-002 7
6
5
12
3
4
P3400-003
3
4
2
1
6
5

General Information 5
&
%
The Xerox Phaser 3400 printer comes equipped with a USB and Parallel connection.
There is an optional Network Interface Card available.
." Top LED on = Connected to the Network.
!" Bottom LED blinking = The NIC card is functioning, live and ready to receive data.
" Optional 10/100 BaseT NIC, Internal network card with LED lights.
" USB (Universal Serial Bus) port, USB V.1.1 compliant is standard.
/" Parallel Port - Centronics IEEE P1284 Compliant bi-directional (Nibble, Byte
and ECP).
&01%"
P3400-004
1
2
4
5
3

6 Xerox Phaser 3400 Printer Service Guide
+
The Front Control Panel is located on the top, right-side of the printer. The Control Panel
includes two buttons and four LEDs indicating the printers status as follows:
If all lights are blinking, this indicates a system error. Turn the power off and then back on
to attempt to clear.
." 2# ■ +)-./#''
■ +)--,,
-, )-.(#'
■ '# )#0,''0,'# )#0
,''-.#--
0-#
■ (.0-
##
#-#
■ (,-,.1
!" 34
#
■ (,5-,.&'
'1 
2,#
##, #,
1 
" # ■ (.('
■ (,2-,.1
■ +)--,,2-,
)-.(#'
" 5# ■ (.&
■ (,34-,.&'
'1 
■  ).&-
■ # ).-
/" * ■ 1 0,,
 -,# )0,
#, 
6" 7 ■ 3,,34-,#
#,#
0##, ',
,
■ ##0,
, -,# )0
,#, 
+
P3400-005
1
2
3
4
5
6

General Information 7
%5,
3
38#
Input Source * Acceptable Weight
 0
( 0
$4 #
$55!-6
"# $ #
$5$-6
9#0,0#
3
3$ . ! 34

- 4!7  8 8 8
-# 4!7  8 8 8
2, %!75!  8 8 8
' 579%  8 8 8
'/ 475  8
'6 5!74  8
+ 4!7  8 8 8
7/4:% 47!%  8 8 8
7/4% %$7!5  8 8 8
$‡8
2,99
34. 9
39
/9
5-9
7/9
;<9
79! 
47%! 
$79 
575 
%$7!5 
8
8
8
8
8
8
 8
-* 8
‡ Minimum size: 80 x 148 mm (3.15 x 5.83 in.); maximum size: 215.9 x 355.6 mm (8.5 x
14 in.)
* Print single-sided only
** For envelopes, open the rear face-up tray for output. The optional 550-sheet paper
tray 2 can also handle envelopes.

8 Xerox Phaser 3400 Printer Service Guide

*
The Xerox Phaser 3400 printer comes equipped with 16 Mbytes standard on-board
memory and is expandable as shown below to a maximum of 80 Mbytes.
Adding additional RAM:
■Improves system performance
■Improves processing of complex jobs
Memory
32
Memory can expand to include a 16-, 32-, 64-Mbyte DIMM. The memory DIMM is a
customer-installable device and can only be purchased from Xerox. The DIMM is an
unbuffered, Xerox proprietary, (100-pin, 50-ns, No Parity, 3.3 SDRAM DIMM).
0 Memory can be installed in the lower DIMM slot only.
:&;"" <$" 
(:/"""<$00$" 
==#  ==
32
3# 0*
$" :/"" 59%5%4
" :/"" 59%5%9
$" :/"" 59%5%5

General Information 9
5
Place the printer on a flat, stable surface near your workstation. Leave enough space
around the printer so you can easily perform the following:
■Open the printer top cover.
■Load paper.
■Retrieve paper.
■Open the front multi-purpose feeder tray and retrieve paper from the rear output
face-down tray.
■Allow air circulation around the vents to prevent the printer from overheating.
5
5 
>-, 9964(
$6%!,(
3, $6
:, 596$
3-,5?" )-6 #
3-,5?" )-6 #
P3400-006
14.2 in
362 mm
17.5 in
446 mm
16.1 in
409 mm