Brother DCP-1510 User manual

Confidential
Brother Laser MFC
SERVICE MANUAL
MODEL:
DCP-1510/1511/1512/1518
MFC-1810/1811/1813/1815/1818
Read this manual thoroughly before maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.
May 2013
SM-FAX146
8C5G*

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The function comparative table below is for models described in this Service Manual.
DCP-1510 DCP-1511 DCP-1512 DCP-1518
LCD 16 characters
x 2 lines
16 characters
x 2 lines
16 characters
x 2 lines
10 characters
x 2 lines (2byte)
20 characters
x 2 lines (1byte)
Wired/ Wireless LAN N/A N/A N/A N/A
Scanner One-sided One-sided One-sided One-sided
ADF N/A N/A N/A N/A
Capacity
(Paper tray) 150 sheets 150 sheets 150 sheets 150 sheets
Speaker N/A N/A N/A N/A
Ten-key pad N/A N/A N/A N/A
FAX N/A N/A N/A N/A
Handset N/A N/A N/A N/A
MFC-1810 MFC-1811 MFC-1813 MFC-1815
LCD 16 characters
x 2 lines
16 characters
x 2 lines
10 characters
x 2 lines (2byte)
20 characters
x 2 lines (1byte)
16 characters
x 2 lines
Wired/ Wireless LAN N/A N/A N/A N/A
Scanner One-sided One-sided One-sided One-sided
ADF 9999
Capacity
(Paper tray) 150 sheets 150 sheets 150 sheets 150 sheets
Speaker 9999
Ten-key pad 9999
FAX 9999
Handset N/A N/A N/A 9
MFC-1818
LCD
10 characters
x 2 lines (2byte)
20 characters
x 2 lines (1byte)
Wired/ Wireless LAN N/A
Scanner One-sided
ADF 9
Capacity
(Paper tray) 150 sheets
Speaker 9
Ten-key pad 9
FAX 9
Handset 9

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TRADEMARKS
The Brother logo is a registered trademark of Brother Industries, Ltd.
Brother is a trademark of Brother Industries, Ltd.
Microsoft, Windows, Windows Vista, Windows Server, Outlook and Internet Explorer are either
registered trademarks or trademarks of Microsoft Corporation in the United States and/or other
countries.
Apple, Macintosh, Safari and Mac OS are trademarks of Apple Inc., registered in the U.S. and other
countries.
Linux is the registered trademark of Linus Torvalds in the U.S. and other countries.
Intel and Pentium are trademarks of Intel Corporation in the U.S. and/or other countries.
Adobe, Photoshop and Reader are either registered trademarks or trademarks of Adobe Systems
Incorporated in the United States and/or other countries.
Each company whose software title is mentioned in this manual has a Software License Agreement
specific to its proprietary programs.
Any trade names and product names of companies appearing on Brother products, related
documents and any other materials are all trademarks or registered trademarks of those
respective companies.
© Copyright Brother 2013
All rights reserved.
No part of this publication may be reproduced in any form or by any means without permission in writing
from the publisher.
All other product and company names mentioned in this manual are trademarks or registered
trademarks of their respective holders.
Specifications are subject to change without notice.

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CONTENTS
REGULATION ........................................................................................................... vi
SAFETY INFORMATION......................................................................................... viii
CHAPTER 1 TROUBLESHOOTING
1. INTRODUCTION .......................................................................................................................... 1-1
1.1 Checks before Commencing Troubleshooting..................................................................... 1-1
2. OVERVIEW .................................................................................................................................. 1-3
2.1 Cross-section Drawing......................................................................................................... 1-3
2.1.1 Printer part............................................................................................................. 1-3
2.1.2 Scanner part.......................................................................................................... 1-4
2.2 Paper Feeding ..................................................................................................................... 1-5
2.2.1 Printer part............................................................................................................. 1-5
2.2.2 Scanner part.......................................................................................................... 1-6
2.3 Operation of Each Part ........................................................................................................ 1-7
2.4 Block Diagram ..................................................................................................................... 1-8
2.5 Main Components................................................................................................................ 1-9
3. ERROR INDICATIONS............................................................................................................... 1-10
3.1 Error Codes ....................................................................................................................... 1-10
3.2 Error Messages ................................................................................................................. 1-18
3.3 Connection Error................................................................................................................ 1-20
4. TROUBLESHOOTING ............................................................................................................... 1-23
4.1 Error Cause and Remedy .................................................................................................. 1-23
4.2 Troubleshooting for Paper Feeding Problems ................................................................... 1-45
4.2.1 No paper is fed from the paper tray..................................................................... 1-45
4.2.2 Paper becomes wrinkled ..................................................................................... 1-45
4.2.3 Paper is curled .................................................................................................... 1-46
4.2.4 Paper is jammed ................................................................................................. 1-46
4.3 Image Defects.................................................................................................................... 1-47
4.4 Troubleshooting According to Image Defect...................................................................... 1-48
4.4.1 Light..................................................................................................................... 1-48
4.4.2 Faulty registration................................................................................................ 1-48
4.4.3 Dark..................................................................................................................... 1-49
4.4.4 Poor fixing ........................................................................................................... 1-49
4.4.5 Completely blank................................................................................................. 1-50
4.4.6 Image distortion................................................................................................... 1-50
4.4.7 All black ............................................................................................................... 1-51
4.4.8 Dirt on the back of paper ..................................................................................... 1-51
4.4.9 Vertical streaks.................................................................................................... 1-52

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4.4.10 Black vertical streaks on a light background ....................................................... 1-52
4.4.11 Black horizontal stripes ....................................................................................... 1-53
4.4.12 White vertical streaks .......................................................................................... 1-53
4.4.13 White horizontal streaks ...................................................................................... 1-54
4.4.14 Faint print ............................................................................................................ 1-54
4.4.15 White spots.......................................................................................................... 1-55
4.4.16 Black spots .......................................................................................................... 1-55
4.4.17 Black band........................................................................................................... 1-56
4.4.18 Downward fogging of solid color ......................................................................... 1-56
4.4.19 Horizontal lines.................................................................................................... 1-56
4.4.20 Ghost................................................................................................................... 1-57
4.4.21 Fogging ............................................................................................................... 1-57
4.5 Troubleshooting for Software Problems ............................................................................ 1-58
4.5.1 Cannot print data................................................................................................. 1-58
4.6 Troubleshooting for Control Panel Problems..................................................................... 1-59
4.6.1 Nothing is displayed on the LCD ......................................................................... 1-59
4.6.2 Control panel is inoperable.................................................................................. 1-59
4.7 Troubleshooting for Toner and Drum Problems ................................................................ 1-60
4.7.1 Replaced the toner cartridge with a new one
but still seeing error message prompting toner cartridge replacement. .............. 1-60
4.7.2 Toner cartridge cannot be detected .................................................................... 1-60
4.7.3 Failed to detect toner cartridge............................................................................ 1-60
4.7.4 Drum error ........................................................................................................... 1-61
4.7.5 Drum unit cannot be detected. ............................................................................ 1-61
4.7.6 Replace drum unit (replaced the drum unit with a new one
but still seeing LED display prompting toner cartridge replacement) .................. 1-61
4.8 Troubleshooting for Fuser Unit Problems .......................................................................... 1-62
4.8.1 Fuser unit failure.................................................................................................. 1-62
4.9 Troubleshooting for Laser Unit Problems .......................................................................... 1-62
4.9.1 Laser unit failure.................................................................................................. 1-62
4.10 Troubleshooting for Document Paper Feeding Problems.................................................. 1-63
4.10.1 No document is fed ............................................................................................. 1-63
4.10.2 Multiple documents are fed ................................................................................. 1-63
4.10.3 Document becomes jammed............................................................................... 1-63
4.10.4 Document becomes wrinkled .............................................................................. 1-65
4.10.5 Document size is not detected correctly.............................................................. 1-65
4.11 Troubleshooting for Scanned Image Defects .................................................................... 1-66
4.11.1 Defect examples.................................................................................................. 1-66
4.11.2 Troubleshooting according to image defect ........................................................ 1-66
4.12 Troubleshooting for FAX/Phone Problems ........................................................................ 1-70
4.12.1 Fax cannot be sent.............................................................................................. 1-70
4.12.2 Fax cannot be received ....................................................................................... 1-70
4.12.3 Ringtone does not sound .................................................................................... 1-71
4.12.4 Telephone communication is unavailable ........................................................... 1-71
4.12.5 Communication error occurs ............................................................................... 1-71
4.13 Troubleshooting for Other Problems.................................................................................. 1-72
4.13.1 Machine does not turn ON .................................................................................. 1-72

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4.13.2 Main motor failure................................................................................................ 1-72
4.13.3 Unusual noise is coming from the machine......................................................... 1-72
4.13.4 Memory failure..................................................................................................... 1-72
4.13.5 Print failure .......................................................................................................... 1-73
CHAPTER 2 DISASSEMBLY/REASSEMBLY
1. PACKING ..................................................................................................................................... 2-1
2. TIGHTENING TORQUE LISTS .................................................................................................... 2-2
3. LUBRICATION ............................................................................................................................. 2-3
4. OVERVIEW OF GEARS............................................................................................................... 2-3
5. HARNESS ROUTING................................................................................................................... 2-5
6. DISASSEMBLY FLOW CHART................................................................................................. 2-12
7. DISASSEMBLY PROCEDURE .................................................................................................. 2-13
7.1 Preparation ........................................................................................................................ 2-13
7.2 Side cover R ...................................................................................................................... 2-14
7.3 ADF unit (only for models with ADF unit)........................................................................... 2-15
7.3.1 Hinge ................................................................................................................... 2-16
7.3.2 Document stopper ............................................................................................... 2-16
7.3.3 ADF cover ........................................................................................................... 2-17
7.3.4 Handle cover ....................................................................................................... 2-17
7.3.5 Document cover support ..................................................................................... 2-18
7.3.6 Document cover .................................................................................................. 2-18
7.3.7 Document separate roller holder ASSY .............................................................. 2-20
7.4 Document scanner unit / Document cover (only for models without ADF unit) ................. 2-21
7.4.1 CIS unit / CIS flat cable ....................................................................................... 2-22
7.5 Panel unit........................................................................................................................... 2-25
7.6 Low voltage power supply PCB unit .................................................................................. 2-26
7.7 High voltage power supply PCB ASSY.............................................................................. 2-28
7.8 Modem PCB ASSY (only for models with modem PCB) ................................................... 2-29
7.9 Main PCB ASSY ................................................................................................................ 2-30
7.10 Top cover ASSY ................................................................................................................ 2-32
7.11 Side cover L....................................................................................................................... 2-33
7.12 Handset holder (only for models with handset) ................................................................. 2-34
7.13 Fuser unit........................................................................................................................... 2-35
7.14 Back cover ......................................................................................................................... 2-36
7.15 Tray cover ASSY ............................................................................................................... 2-37
7.16 Front cover......................................................................................................................... 2-38
7.17 Laser unit........................................................................................................................... 2-39
7.18 Motor encoder PCB ASSY................................................................................................. 2-41
7.19 Eject sensor PCB ASSY.................................................................................................... 2-42
7.20 Paper feed/paper printing position sensor PCB ASSY ...................................................... 2-43
7.21 New toner sensor PCB ASSY............................................................................................ 2-44

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CHAPTER 3 ADJUSTING AND UPDATING SETTINGS AS REQUIRED AFTER
PARTS REPLACEMENT
1. IF YOU REPLACE THE MAIN PCB ASSY .................................................................................. 3-1
1.1 Installing Main Firmware...................................................................................................... 3-2
1.1.1 Checking firmware version .................................................................................... 3-2
1.1.2 Installing main firmware......................................................................................... 3-2
1.2 Initializing the EEPROM of the Main PCB ASSY (function code: 01).................................. 3-3
1.3 Setting by Country (function code: 74) ................................................................................ 3-3
1.4 Installing Language Firmware (except for Chinese model) ................................................. 3-3
1.5 Setting Serial Number and Entering Adjusted Value of Laser Unit...................................... 3-4
1.6 Acquiring White Level Data (function code: 55)................................................................... 3-5
1.7 Setting Language (function code: 52) (only for CEE model) ............................................... 3-5
1.8 Checking Printing and Scanning.......................................................................................... 3-5
2. IF YOU REPLACE THE LASER UNIT ......................................................................................... 3-6
2.1 Entering Adjusted Value of Laser Unit................................................................................. 3-7
3. IF YOU REPLACE THE DOCUMENT SCANNER UNIT OR CIS UNIT....................................... 3-8
3.1 Acquiring White Level Data (function code: 55)................................................................... 3-8
4. IF YOU REPLACE THE LOW VOLTAGE POWER SUPPLY PCB UNIT.................................... 3-9
4.1 Resetting Irregular Power Supply Detection Counter .......................................................... 3-9
5. IF YOU REPLACE THE PANEL ASSY...................................................................................... 3-10
5.1 Checking LCD Operation (function code: 12) .................................................................... 3-10
5.2 Checking Control Panel Operation (function code: 13) ..................................................... 3-10
CHAPTER 4 SERVICE FUNCTIONS
1. MAINTENANCE MODE................................................................................................................ 4-1
1.1 How to Enter Maintenance Mode ........................................................................................ 4-1
1.1.1 Method of entering end-user accessible maintenance mode................................ 4-1
1.1.2 Method of entering maintenance mode for service personnel .............................. 4-2
1.2 List of Maintenance Mode Functions ................................................................................... 4-3
1.3 Details of Maintenance Mode Functions.............................................................................. 4-4
1.3.1 Initialize EEPROM parameters (function code: 01, 91)......................................... 4-4
1.3.2 Print white level / black level data for document scanning compensation
(function code: 05)................................................................................................. 4-5
1.3.3 Move CIS unit to transportation position (function code: 06)................................. 4-8
1.3.4 ADF performance test (function code: 08) ............................................................ 4-8
1.3.5 Monochrome image quality test pattern (function code: 09) ................................. 4-9
1.3.6 Set worker switches (WSW) and print worker switch setting data
(function code: 10, 11)......................................................................................... 4-10
1.3.7 Check LCD operation (function code: 12) ........................................................... 4-14
1.3.8 Check control panel button operation (function code: 13)................................... 4-15

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1.3.9 Display software version (function code: 25)....................................................... 4-16
1.3.10 Check sensor operation (function code: 32)........................................................ 4-17
1.3.11 Set PC print functions (function code: 43)........................................................... 4-18
1.3.12 Change USB No. return value (function code: 45) .............................................. 4-21
1.3.13 Set country / language (function code: 52).......................................................... 4-22
1.3.14 Transfer received fax data / log information (function code: 53) ......................... 4-23
1.3.15 Fine-tune scanning position (function code: 54).................................................. 4-25
1.3.16 Acquire white level data and set CIS scan area (function code: 55) ................... 4-25
1.3.17 Print test (function code: 67) ............................................................................... 4-26
1.3.18 Print frame pattern (single-side printing) (function code: 69) .............................. 4-27
1.3.19 Print test pattern (function code: 71) ................................................................... 4-28
1.3.20 Setting by country (function code: 74)................................................................. 4-29
1.3.21 Print maintenance information (function code: 77).............................................. 4-31
1.3.22 Display machine log information (function code: 80)........................................... 4-33
1.3.23 Display machine error code (function code: 82).................................................. 4-36
1.3.24 Send communication log information to telephone line (function code: 87) ........ 4-36
1.3.25 Quit maintenance mode (function code: 99) ....................................................... 4-36
2. OTHER SERVICE FUNCTIONS................................................................................................. 4-37
2.1 Manual Toner Reset Functions.......................................................................................... 4-37
2.2 Drum Counter Reset Functions (only for ten-key pad model) ........................................... 4-37
2.3 Display ROM Version ........................................................................................................ 4-38
APPENDIX 1 SERIAL NUMBERING SYSTEM
APPENDIX 2 DELETING USER SETTING INFORMATION

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REGULATION
Declaration of Conformity (Europe only)
We, Brother Industries, Ltd.
15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561 Japan
declare that this product is in conformity with the essential requirements of all relevant
directives and regulations applied within the European Community.
The Declaration of Conformity (DoC) can be downloaded from our website. Visit
http://solutions.brother.com/ and:
→select “Europe”
→select your country
→select your model
→select “Manuals” and your language, then click “Search”
→select Declaration of Conformity
→click “Download”.
Your Declaration will be downloaded as a PDF file.
Declaration of Conformity for R&TTE (Radio and Telecommunications)
Directive 1999/5/EC (Europe only)
(Applicable to models with telecommunications and/or radio interfaces)
We, Brother Industries, Ltd.
15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561 Japan
declare that these products are in conformity with the provisions of the R&TTE Directive
1999/5/EC. A copy of the Declaration of Conformity can be downloaded by following the
instructions in the Declaration of Conformity (Europe only) section.
IEC60825-1:2007 Specification (For 220-240V Models only)
This product is a Class 1 laser product as defined in IEC60825-1:2007 specifications. The
label shown below is attached in countries where required.
%.#55.#5'4241&7%6
#22#4'+..#5'4&'%.#55'
.#5'4-.#55'241&7-6

vii Confidential
Internal Laser radiation
Wave Length: 770 - 800 nm
Output: 25 mW max.
Laser Class: Class 3B
Disconnect Device
Radio Interference
This product complies with EN55022 (CISPR Publication 22)/Class B.
Recycling Information in accordance with the WEEE (2002/96/EC) and
Battery (2006/66/EC) Directives
The product/battery is marked with one of the above recycling symbols. It indicates that at
the end of the life of the product/battery, you should dispose of it separately at an appropriate
collection point and not place it in the normal domestic waste stream.
International ENERGY STAR®Qualification Statement
The purpose of the International ENERGY STAR®Program is to promote the development
and popularization of energy-efficient office equipment.
As an ENERGY STAR®Partner, Brother Industries, Ltd. has determined that this product
meets the ENERGY STAR®specifications for energy efficiency.
WARNING
Use of controls, adjustments or performance of procedures other than those specified
in this manual may result in hazardous radiation exposure.
CAUTION
This product must be installed near an electrical socket that is easily accessible. In
case of emergencies, you must disconnect the power cord from the electrical socket
to shut off power completely.
Product mark Battery mark
European Union only

viii Confidential
SAFETY INFORMATION
WARNING
WARNING indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injuries.
CAUTION
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injuries.
IMPORTANT
IMPORTANT indicates a potentially hazardous situation which, if not avoided, may result
in damage to property or loss of product functionality.
Prohibition icons indicate actions that must not be performed.
Electrical Hazard icons alert you to possible electrical shock.
Fire Hazard icons alert you to the possibility of fire.
Hot Surface icons warn you not to touch product parts that are hot.
Note Notes tell you how you should respond to a situation that may arise or give tips about
how the operation works with other features.

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To use the Machine Safely
Please keep these instructions for later reference and read them before attempting any
maintenance. If you do not follow these safety instructions, there is a possibility of a fire,
electrical shock, burn or suffocation.
WARNING
ELECTRICAL HAZARDS
Failure to follow the warnings in this section may create the risk of an electrical shock.
In addition, you could create an electrical short, which may create the risk of a fire.
There are high voltage electrodes inside the product. Before you access the inside of
the product, including for routine maintenance such as cleaning, make sure you have
unplugged the telephone line cord first (MFC only) and then the power cord from the
AC power outlet, as well as any telephone (RJ-11) (MFC only) from the product.
Never push objects of any kind into this product through cabinet slots, since they may
touch dangerous voltage points or short out parts.
DO NOT handle the plug with wet hands.
DO NOT use this product during an electrical storm.
Always make sure the plug is fully inserted. DO NOT use the product or handle the
cord if the cord has become worn or frayed.
DO NOT allow this product to come into contact with water. This product should not
be used around standing water, including a bath tub, sink, or swimming pool; around
appliances containing water, including a refrigerator; or in a wet basement.
This product should be connected to an AC power source within the range indicated
on the rating label. DO NOT connect it to a DC power source or inverter. If you are not
sure what kind of power source you have, contact a qualified electrician.

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POWER CORD SAFETY:
• Use only the power cord supplied with this product.
• DO NOT allow anything to rest on the power cord. DO NOT place this product
where people can walk on the cord.
• DO NOT place this product in a position where the cord is stretched or strain is
otherwise put on the cord. Doing so may cause the cord to become worn or frayed.
• Brother strongly recommends that you DO NOT advise using an extension cord.
• DO NOT put a toner cartridge and drum unit assembly into a fire. It could explode,
resulting in injuries.
• DO NOT use flammable substances, any type of spray, or an organic solvent/liquid
containing alcohol or ammonia to clean the inside or outside of the product. Doing
so could cause a fire or electrical shock. Instead, use only a dry, lint-free cloth.
DO NOT attempt to operate this product with a paper jam or with stray pieces of paper
inside the product. Prolonged contact of the paper with the drum unit could cause a fire.
DO NOT use a vacuum cleaner to clean up scattered toner. Doing this might cause
the toner dust to ignite inside the vacuum cleaner, potentially starting a fire. Please
carefully clean the toner dust with a dry, lint-free soft cloth and dispose of it according
to local regulations.
HOT SURFACE
After you have just used the product, some internal parts of the product will be
extremely hot. Wait at least 15 minutes for the product to cool down before you touch
the internal parts of the product.

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(MFC only)
Use caution when modifying telephone lines. Never touch exposed telephone wiring
or terminals unless the telephone line has been unplugged at the wall socket. Never
fit telephone wiring during an electrical storm. Never fit a telephone wall socket in a
wet location. Doing this might cause an electrical shock.
When moving the product, hold it by grasping the handholds at the bottom firmly from
the front of the product.
To prevent injuries, be careful not to put your finger in the areas shown in the
illustration.
When using your telephone equipment, basic safety precautions should always be
followed to reduce the risk of fire, electrical shock and injury to people, including the
following:
1. DO NOT use this product near water, for example, near a bath tub, wash bowl,
kitchen sink or washing machine, in a wet basement or near a swimming pool.
2. Avoid using this product during an electrical storm. There may be a remote risk of
electric shock from lightning.
3. DO NOT use this product to report a gas leak in the vicinity of the leak.
4. Use only the power cord provided with the product.
SAVE THESE INSTRUCTIONS
(MFC only)
To reduce the risk of shock or fire, use only a No. 26 AWG or larger
telecommunication line cord.

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Caution for Laser Product (WARNHINWEIS fur Laser drucker)
CAUTION: When the machine during servicing is operated with the cover open, the
regulations of VBG 93 and the performance instructions for VBG 93 are
valid.
CAUTION: In case of any trouble with the laser unit, replace the laser unit itself. To
prevent direct exposure to the laser beam, do not try to open the enclosure
of the laser unit.
ACHTUNG: Im Falle von Störungen der Lasereinheit muß diese ersetzt werden. Das
Gehäuse der Lasereinheit darf nicht geöffnet werden, da sonst
Laserstrahlen austreten können.
Additional Information
When servicing the optical system of the machine, be careful not to place a screwdriver or
other reflective object in the path of the laser beam. Be sure to take off any personal
accessories such as watches and rings before working on the machine. A reflected beam,
though invisible, can permanently damage the eyes.
Since the beam is invisible, the following caution in print is attached on the laser unit.
CAUTION
Lightning and power surges can damage this product! We recommend that you use a
quality surge protection device on the AC power line, or unplug the machine during a
lightning storm.
Violently closing the top cover without mounting the toner cartridge and the drum unit
can damage this product.
<Location of the laser beam window>

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Unlawful use of Copying Equipment
It is an offence to make reproductions of certain items or documents with the intent to commit
fraud. The following is a non-exhaustive list of documents which it may be unlawful to
produce copies of. We suggest you check with your legal adviser and/or the relevant legal
authorities if in doubt about a particular item or document:
• Currency
• Bonds or other certificates of debt
• Certificates of Deposit
• Armed forces service or draft papers
• Passports
• Postage stamps (canceled or uncanceled)
• Immigration papers
• Welfare documents
• Cheques or drafts drawn by governmental agencies
• Identifying badges or insignias
In addition, driving licenses and/or Certificates of Title to motor vehicles may not be copied
under certain national laws.
Copyrighted works cannot be copied lawfully, subject to the “fair dealing” exception relating
to sections of a copyrighted work. Multiple copies would indicate improper use. Works of art
should be considered the equivalent of copyrighted works.

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Troubleshooting/Disassembling/Assembling Notes
• To avoid creating secondary problems by mishandling, follow the warnings and
precautions below during maintenance work.
• Be careful not to lose screws, washers, or other parts removed.
• Be sure to apply grease to applicable positions specified in this manual.
• When using soldering irons or other heat-generating tools, take care not to accidentally
damage parts such as wires, PCBs and covers.
• Static electricity charged in your body may damage electronic parts. When transporting
PCBs, be sure to wrap them in conductive sheets.
• When replacing PCBs and all the other related parts, put on a grounding wrist band and
perform the job on a static mat. Also take care not to touch the conductor sections on the
flat cables or on the wire harness.
• After disconnecting flat cables, check that each cable is not damaged at its end or short-
circuited.
• When connecting flat cables, do not insert them at an angle. After insertion, check that the
cables are not inserted at an angle.
• When connecting or disconnecting harnesses, hold the connector body, not the cables. If
the connector is locked, release it first.
• After a repair, check not only the repaired portion but also harness treatment. Also check
that other related portions are functioning properly.
• Forcefully closing the joint cover or top cover without mounting the toner cartridge and the
drum unit can damage the machine.
• After assembly, it is recommended to conduct a dielectric test and continuity test.
• Be sure to unplug the AC cord before removing any covers or PCBs, adjusting the
machine, or conducting continuity tests using a tester.
• The insulation sheet should not be damaged.

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CHAPTER 1 TROUBLESHOOTING
1. INTRODUCTION
Troubleshooting is a collection of solution procedures that service personnel should follow if
an error or malfunction occurs in the machine. It is difficult to determine troubleshooting
procedures for all possible problems that may occur in the future. Therefore, this chapter
describes typical problems and recovery procedures for these. These will help service
personnel identify and repair other similar defective sections.
Be sure to observe the Troubleshooting/Disassembling/Assembling Notes during
maintenance work for troubleshooting.
1.1 Checks before Commencing Troubleshooting
Operating environment
(1) The machine is placed on a flat, stable surface.
(2) The machine is used in a clean environment where the temperature is 10°C (50°F) to
32.5°C (90.5°F), and the relative humidity is maintained between 20% and 80%.
(3) The machine is not exposed to direct sunlight, excessive heat, moisture, or dust.
(4) Hold the machine level while moving it.
Power supply
(1) Power described on the rating label attached on the machine is supplied. Power
fluctuation should be within ±10% of the rated voltage.
(2) The AC input power supply is within the regulated value.
(3) The cables and harnesses are connected correctly.
(4) The fuses are not blown.
Paper
(1) The recommended type of paper is being used.
(2) The document is not damp.
(3) Short-grained paper or acid paper is not used.
Consumable parts
(1) The drum unit (including toner cartridge) is set correctly.

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Others
(1) Condensation
When the machine is moved to a warm room from a cold location, condensation may
occur inside the machine, causing various problems as listed below.
• Condensation on the surface of optical devices such as the lens, reflecting mirror and
protection glass may cause light print image.
• If the exposure drum is cold, the electrical resistance of the photosensitive layer is
increased, making it impossible to obtain the correct print density.
• Condensation on the charge unit may cause corona charge leakage, resulting in
image defects.
• Condensation on the plate may cause paper feed problems.
If condensation has formed in the machine, leave the machine for at least two hours until
it reaches room temperature.
If the drum unit is unpacked soon after it is moved to a warm room from a cold location,
condensation may occur inside the unit which may cause printing failure.
Leave the drum unit for one or two hours until it reaches room temperature, and then
unpack it.
(2) Low temperature
The motor may not operate normally in a cold environment because too much load is
applied to each drive. In this case, increase the room temperature.
Cleaning
Use a soft lint-free cloth.
WARNING
DO NOT use any flammable spray or flammable solvent such as alcohol, benzine,
or thinner to clean the machine. DO NOT use these articles near the machine.

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2. OVERVIEW
2.1 Cross-section Drawing
2.1.1 Printer part
Fig. 1-1
Laser unit
Plate Pick-up roller Separation Pad
Paper feed
actuator L/R
Separation roller
Paper printing
position actuator
Transfer roller
Exposure drum
Corona wire
Fuser unit
Pressure roller
Eject actuatorEject roller
Supply roller
Developer roller
Heat roller
Tray cover