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: May 2009
Prepared By:
Xerox Corporation
GPDG Worldwide Product Training and Information
26600 SW Parkway
Wilsonville, OR 97070
Unpublished rights reserved under the copyright laws of the United States. Contents of this publication may not be reproduced in any form without
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ENERGY STAR name and logo are registered U.S. marks.
The Phaser 6121MFP Service Manual is the primary document used for repairing,
maintaining, and troubleshooting the printer. Use this manual as your primary
resource for understanding the operational characteristics of the printer and all
available options. This manual describes specifications, theory, and the diagnosis
and repair of problems occurring in the printer and attached options. Also included
are detailed replacement procedures, parts lists, and wiring diagrams.
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.
A warning indicates an operating or maintenance procedure, practice or
condition that, if not strictly observed, results in injury or loss of life.
A caution indicates an operating or maintenance procedure, practice or
condition that, if not strictly observed, results in damage to, or destruction of,
equipment.
A replacement note provides important information related to parts
replacement. When needed, replacement notes appear at the end of the
dissasembly procedure.
A note indicates an operating or maintenance procedure, practice or condition
that is necessary 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.
Phaser 6121MFP Service Manualxi
Manual Organization
The Phaser 6121MFP Service Manual contains these sections:
Introductory, Safety, and Regulatory Information: This section contains
important safety information and regulatory requirements.
Chapter 1 - General Information: This section contains an overview of the
printer’s operation, configuration, specifications, and consumables.
Chapter 2 - Theory of Operation: This section contains detailed functional
information on the print engine components.
Chapter 3 - Error Codes and Messages: This section provides detailed
troubleshooting procedures for error messages and codes generated by resident
diagnostics.
Chapter 4 - General Troubleshooting: Troubleshooting discussions covering
troubleshooting procedures not associated with a Service Call code or Control
Panel error message.
Chapter 5 - Print-Quality Troubleshooting: This section focuses on techniques to
correct image quality problems associated with the printer output.
Chapter 6 - Adjustments and Calibrations: This section provides procedures for
the adjustment of print engine components.
Chapter 7 - Cleaning and Maintenance: This section provides periodic cleaning
procedures for the printer.
Chapter 8 - Service Parts Disassembly: This section contains removal procedures
for spare parts listed in the Parts List. A replacement procedure is included when
necessary.
Chapter 9 - Parts List: This section contains exploded views of the print engine
and optional Field Replaceable Units (FRUs), as well as part numbers for orderable
parts.
Chapter 10 - Plug/Jack and Wiring Diagrams: This section contains the plug/jack
locations and the wiring diagrams for the printer.
Reference: This section provides an illustration of the printer’s menu structure,
printer firmware update instructions, and a list of acronyms and abbreviations.
xiiPhaser 6121MFP Service Manual
Symbols Marked on the Product
Danger invisible laser radiation when open. Avoid direct
exposure to beam.
Hot surface on or in the printer. Use caution to avoid personal
injury.
Use caution (or draws attention to a particular component).
Refer to the manua l(s) for information.
It may take 30 minutes for the Fuser to cool down.
Product Terms
Do not touch the item.
Do not expose the item to sunlight.
Do not expose the item to light.
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.
Phaser 6121MFP Service Manualxiii
Power Safety Precautions
Warning
Power Source
For 115 VAC printers, do not apply more than 127 volts RMS between the supply
conductors or between either supply conductor and ground. For 230 VAC printers,
do not apply more than 254 volts RMS between the supply conductors or between
either supply conductor and ground. Use only the specified power cord and
connector. 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. A protective ground connection by way of the
grounding conductor in the power cord is essential for safe operation.
Disconnecting Power
Turning the power Off using the power switch does not completely de-energize
the printer. You must also disconnect the power cord from the printer’s
Alternating Current (AC) inlet. Disconnect the power cord 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 product,
•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.
xivPhaser 6121MFP Service Manual
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 reduce the occurrence of component damage caused by
static electricity.
Ensure 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. To drain the electrostatic
charge, touch an earth ground source or wear a wrist strap device connected
to an earth ground source. Wearing a wrist strap also prevents accumulation
of additional bodily static charges. 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 that the device is being installed in.
•Minimize body motions when handling unpacked 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 electrostatically sensitive device.
•Handle ICs and Erasable Programmable Read-Only Memories (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).
Phaser 6121MFP Service Manualxv
Service Safety Summary
General Guidelines
For qualified service personnel only: Refer also to the preceding “Power Safety
Precautions” on page xiv.
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.
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 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 6121MFP 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 product does not emit hazardous laser
radiation; which 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 to minimize hazards from the laser.
xviPhaser 6121MFP Service Manual
Servicing Electrical Components
Warning
Warning
Warning
Before starting any service procedure, switch the printer power Off 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.
Servicing Mechanical Components
When servicing mechanical components within the printer, manually rotate the
Drive Assemblies, Rollers, and Gears.
Do not try to manually rotate or manually stop the drive assemblies while any
motor is running.
Servicing Fuser Components
This printer uses heat to fuse the image to paper. When operating, the Fuser 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 or adjacent components.
Phaser 6121MFP Service Manualxvii
Regulatory Specifications
Xerox has tested this product to electromagnetic emission and immunity
standards. These standards are designed to mitigate interference caused or
received by this product in a typical office environment.
United States (FCC Regulations)
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
environment. This equipment generates, uses, and can radiate radio frequency
energy. If it is not installed and used in accordance with these instructions, it may
cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following
measures:
•Reorient or relocate the receiver (device being interfered with).
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that which
•Consult the dealer or an experienced radio/television technician for help.
Any changes or modifications not expressly approved by Xerox could void the
user's authority to operate the equipment. To ensure compliance with Part 15 of
the FCC rules, use shielded interface cables.
Canada (Regulations)
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du
Canada.
the receiver is connected.
xviiiPhaser 6121MFP Service Manual
European Union
The CE mark applied to this product symbolizes Xerox’s declaration of conformity
with the following applicable Directives of the European Union as of the dates
indicated:
December 12, 2006: Low Voltage Directive 2006/95/EC
December 15, 2004: Electromagnetic Compatibility Directive 2004/108/EC
March 9, 1999: Radio & Telecommunications Terminal Equipment Directive 1999/
5/EC
This product, if used properly in accordance with the user's instructions, is neither
dangerous for the consumer nor for the environment.
To ensure compliance with European Union regulations, use shielded interface
cables.
A signed copy of the Declaration of Conformity for this product can be obtained
from Xerox.
Phaser 6121MFP Service Manualxix
xxPhaser 6121MFP Service Manual
General Information
In this chapter...
•Printer Introduction and Overview
•Printer Configurations
•Parts of the Printer
•Maintenance Items
•Consumables
•Specifications
Chapter
1
General Information
Printer Introduction and Overview
The Xerox Phaser 6121MFP combines a color laser print engine, scanner, copier,
and Fax. The print engine uses a four-pass color laser architecture producing 20
page per minute (ppm) monochrome or 5 ppm color prints on Letter or A4 media.
The system connects to the host with USB or 10/100baseT Ethernet ports and
provides a 35-sheet Automatic Document Feeder (ADF) and the standard
200-sheet input Tray. The Output Tray holds 100 (75.2 gsm) sheets facedown.
Available options include a 500-Sheet Feeder (Tray 2) to add input capacity, and
the Duplex Unit enables auto-duplexed (2-sided) printing.
Copy speed is 3 copies per minute (cpm) at a resolution of 600x300 dpi,
monochrome copies at10cpm (600x300 dpi) or 20cpm (300x300 dpi). The Fax
portion of the system incorporates a resolution of up to 203 dpi by 392 dpi. Fax
features include a modem speed of up to 33.6 Kbps using V.34 standard
transmission, print capability of up to a maximum of 250 printed pages. The Fax
includes a phone book, real time clock, and auto redial.
Technical Support Information
The Xerox Phaser 6121 MFP Color Laser Printer Service Manual is the primary
document used for repairing, maintaining, and troubleshooting the printer.
To ensure complete understanding of this product, participation in Xerox Phaser
6121MFP Service Training is strongly recommended. To service this product, Xerox
certification for this product is required.
For updates to the Service Manual, Service Bulletins, knowledge base, etc., go to:
•Xerox Global Service Net: https://www.xrxgsn.com/secure/main.p
For further technical support, contact your assigned Xerox Technical Support for
this product.
1-2Phaser 6121MFP Service Manual
Printer Configurations
General Information
The Phaser 6121MFP is available in three configurations. The 3-in-1 version
connects to the host by USB and provides platen scan. The 4-in-1 versions are
expandable with both the options Tray 2 and Duplex Unit to enable 2-sided
printing. The following table lists shared features of all configurations.
Fea turesSpecification
Processor Speed120 MHz
Max Print Speed (ppm) color/mono5/20
Memory128 MB
USB PortYes
Print Resolutions (dpi):
Draft
Enhanced
600x600
1200x600
Copy Speed with auto document
feeder
Scan speed (Phaser 6121MFP/N or /D
printer configurations only.)
Scan Resolutions150 x 150 dpi
The following table lists printer features by configuration.
Fea tures
10/100 Ethernet PortNoYesYes
ADFNoYesYes
Duplex UnitNoOptionalYes
Color: 3 cpm (600 x 300 dpi)
Monochrome: 10 cpm (600 x 300 dpi)
Monochrome: 20 cpm (300 x 300 dpi)
Color:
600 x 600 dpi: 9.94 mm/second
600 x 300 dpi: 19.88 mm/second
Monochrome:
600 x 600 dpi: 29.81 mm/second
600 x 300 dpi: 59.62 mm/second
300 x 300 dpi: 119.5.25 mm/second
300 x 300 dpi
Configuration
6121/S6121/N6121/D
500-Sheet Feeder (Tray 2)NoOptionalYes
Phaser 6121MFP Service Manual1-3
General Information
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
s6121mfp-017
Parts of the Printer
Front Views
ItemDescriptionItemDescription
1Document Output Tray9Document Cover
2ADF (Auto Document
Feeder) Cover
3ADF Guides11Tray 1
4ADF Tray12Tray 1 Dust Cover
5Document Stopper13Front Door
10Output Tray
6Printer Top14Tray Extension
1-4Phaser 6121MFP Service Manual
7Power Switch15Control Panel
8USB Drive Port16Document Glass
Rear View
s6121mfp-173
2
3
4
5
6
1
General Information
ItemDescription
1Power switch
2Power cord connection
3Fax Phone line out (Phaser 6121MFP/N and /D only)
4Line out jack (Phaser 6121MFP/N and /D only)
5USB cable port
6Network/Ethernet connections (Phaser 6121MFP/N and /D only)
Phaser 6121MFP Service Manual1-5
General Information
s6121mfp-175
1
2
3
Options
Duplex Unit
ItemDescription
1Duplex Unit Optional Base
2Release Lever
3Duplex Unit
1-6Phaser 6121MFP Service Manual
Lower Feeder Tray
2
1
s6121mfp-176
General Information
ItemDescription
1Lower Feeder Unit
2500-Sheet Feeder with Tray Cover
Phaser 6121MFP Service Manual1-7
General Information
s6121mfp-177
43
21
5
8
11
15149131276
10
Control Panel
The Control Panel consists of multiple LEDs, a display, and several function
buttons. These buttons are used to navigate the menu system, perform functions,
and select modes of operation.
Control Panel Button Descriptions
Left side: Fax ControlsMiddleRight side
1. Auto Receive LED
Remains lit while the
automatic receive function
is on. Blinks when there is a
stored fax in memory.
2. Address Book button
Press to access the printer’s
address book, fax numbers,
and E-mail addresses.
3. Redial / Pause button
Recalls the last number
dialed. Inserts a pause
when a fax number is
dialed.
4. On Hook button
When the fax line is shared
with a telephone, pressing
On Hook before sending or
receiving disables the
telephone extension.
5. Menu Display window
Displays settings, menus,
and messages
6. Navigation / Menu buttonsUp / Down arrow buttons
move through menus,
options.
Back / Forward arrow
buttons move left and right
through menus, options.
7. OK (confirm) button
Press to select the setting
that is currently displayed.
8. Alert indicator
When lit, indicates an error
condition or warning.
9. Back/Menu button
Press to go to the System
Menu, cancel an entered
character, or return to the
previous screen.
10.Alphanumeric keypad
Use to enter information.
11.Mode buttons
Press to select Fax, Scan, or
Copy mode.
12.B&W Start button
Starts a fax or B&W copy
or scan.
13.Ready indicator
Lights up when it is OK to
press the Start button to
copy, scan, or fax.
14.Color Start button
Starts a color copy or scan.
15.Stop/Reset button
Press to return to the
default mode main menu;
cancel current print/copy/
fax job.
1-8Phaser 6121MFP Service Manual
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