Canon LBP253 SM User manual

Revision 1.0
LBP253 SM

Introduction
Important Notices
Application
This manual has been issued by Canon Inc. for qualified persons to learn technical theory, installation, maintenance, and repair
of products.
This manual covers all localities where the products are sold. For this reason, there may be information in this manual that does
not apply to your locality.
Corrections
This manual may contain technical inaccuracies or typographical errors due to improvements or changes in products.
When changes occur in applicable products or in the contents of this manual, Canon will release technical information as the
need arises. In the event of major changes in the contents of this manual over a long or short period, Canon will issue a new
edition of this manual.
The following paragraph does not apply to any countries where such provisions are inconsistent with local law.
Trademarks
The product names and company names used in this manual are the registered trademarks of the individual companies.
Copyright
This manual is copyrighted with all rights reserved. Under the copyright laws, this manual may not be copied, reproduced or
translated into another language, in whole or in part, without the consent of Canon Inc.
© CANON INC. 2015
Caution
Use of this manual should be strictly supervised to avoid disclosure of confidential information.
Explanation of Symbols
The following symbols are used throughout this Service Manual.
Symbols Explanation Symbols Explanation
Check.
1x
Remove the claw.
Check visually.
1x
Insert the claw.
Check a sound. Push the part.
Introduction

Symbols Explanation Symbols Explanation
1x
Disconnect the connector. Connect the power cable.
1x
Connect the connector. Disconnect the power cable.
1x
Remove the cable/wire from the
cable guide or wire saddle.
Turn on the power.
1x
Install the cable/wire to the cable
guide or wire saddle.
Turn off the power.
1x
Remove the screw.
1x
Loosen the screw.
1x
Install the screw.
1x
Tighten the screw.
Cleaning is needed. Measurement is needed.
The following rules apply throughout this Service Manual:
1. Each chapter contains sections explaining the purpose of specific functions and the relationship between electrical and
mechanical systems with reference to the timing of operation.
In the diagrams, represents the path of mechanical drive; where a signal name accompanies the symbol, the arrow
indicates the direction of the electric signal.
The expression "turn on the power" means flipping on the power switch, closing the front door, and closing the delivery unit
door, which results in supplying the machine with power.
2. In the digital circuits, '1' is used to indicate that the voltage level of a given signal is "High", while '0' is used to indicate "Low".
(The voltage value, however, differs from circuit to circuit.) In addition, the asterisk (*) as in "DRMD*" indicates that the DRMD
signal goes on when '0'.
In practically all cases, the internal mechanisms of a microprocessor cannot be checked in the field. Therefore, the operations
of the microprocessors used in the machines are not discussed: they are explained in terms of from sensors to the input of
the DC controller PCB and from the output of the DC controller PCB to the loads.
The descriptions in this Service Manual are subject to change without notice for product improvement or other purposes, and
major changes will be communicated in the form of Service Information bulletins.
All service persons are expected to have a good understanding of the contents of this Service Manual and all relevant Service
Information bulletins and be able to identify and isolate faults in the machine.
Introduction

Contents
Safety Precautions...............................................................................................1
Laser Safety........................................................................................................................................ 2
How to Handle the Laser Scanner Unit................................................................................................... 2
Toner Safety........................................................................................................................................2
About Toner..........................................................................................................................................2
Handling Adhered Toner........................................................................................................................2
Notes When Handling a Lithium Battery............................................................................................. 3
Notes on Assembly/Disassembly........................................................................................................3
1. Product Overview.............................................................................................4
Product Lineups.................................................................................................................................. 5
Main unit.............................................................................................................................................. 5
Options................................................................................................................................................ 5
Features.............................................................................................................................................. 6
Features...............................................................................................................................................6
Product Specifications.........................................................................................................................7
List of Parts....................................................................................................................................... 10
External View......................................................................................................................................10
Cross Sectional View...........................................................................................................................11
Operation...........................................................................................................................................12
Operation Panel..................................................................................................................................12
2. Technology..................................................................................................... 13
Basic Operation.................................................................................................................................14
Function Structure...............................................................................................................................14
Sequence of Operation..................................................................................................................... 15
Outline............................................................................................................................................... 15
Laser Exposure System.................................................................................................................... 16
Outline............................................................................................................................................... 16
Optical Unit Failure Detection...............................................................................................................16
Image Formation System.................................................................................................................. 17
Outline............................................................................................................................................... 17
Image Formation Process....................................................................................................................17
High-voltage Power Supply..................................................................................................................20
Fixing System....................................................................................................................................22
Outline............................................................................................................................................... 22
Fixing control circuit.............................................................................................................................22
Pickup Feeding System.....................................................................................................................26
Outline............................................................................................................................................... 26
Jam Detection.....................................................................................................................................27
Controller System..............................................................................................................................29
Outline............................................................................................................................................... 29
DC Controller......................................................................................................................................29
Low-voltage Power Supply...................................................................................................................32
Contents
i

Energy Saving Function.......................................................................................................................33
Embedded RDS................................................................................................................................ 34
Product Overview................................................................................................................................34
Service cautions..................................................................................................................................34
E-RDS Setup...................................................................................................................................... 35
FAQ................................................................................................................................................... 37
Troubleshooting.................................................................................................................................. 39
Error code and strings......................................................................................................................... 40
Setting Information Export/Import Function (DCM)........................................................................... 44
Function Overview.............................................................................................................................. 44
Specifications..................................................................................................................................... 46
Limitations.......................................................................................................................................... 47
Procedure for Exporting/Importing Service Mode Setting Information......................................................49
List of Items Which Can Be Imported....................................................................................................56
3. Periodical Service.......................................................................................... 62
Periodically Replaced Parts.............................................................................................................. 63
Consumable Parts.............................................................................................................................64
Periodical Service..............................................................................................................................65
Cleaning............................................................................................................................................ 66
4. Disassembly/Assembly................................................................................. 67
Outline...............................................................................................................................................68
List of Parts....................................................................................................................................... 69
External View......................................................................................................................................69
List of Main Unit.................................................................................................................................. 70
Motor / Fan.........................................................................................................................................72
Solenoid............................................................................................................................................. 72
Heater / Thermo Switch / Thermistor / Switch........................................................................................73
Sensor............................................................................................................................................... 74
PCB................................................................................................................................................... 75
Connector Layout Drawing................................................................................................................76
Connector List.....................................................................................................................................76
External Cover, Internal Cover..........................................................................................................80
Removing the Left Cover..................................................................................................................... 80
Removing the Right Cover...................................................................................................................80
Removing the Rear Cover Unit / Duplex Feed Unit................................................................................ 81
Removing the Upper Cover Unit...........................................................................................................82
Removing the Cartridge Cover Unit...................................................................................................... 82
Controller System..............................................................................................................................84
Removing the Main Controller Board.................................................................................................... 84
Remove the Sleep Interface PCB.........................................................................................................85
Remove the Duplex Reverse Sensor Unit............................................................................................. 86
Remove the All-Night Power Supply PCB............................................................................................. 86
Remove the Power Supply PCB...........................................................................................................87
Removing the Engine Controller Board.................................................................................................87
Removing the Control Panel Unit..........................................................................................................90
Removing the Main Motor....................................................................................................................91
Removing the Main Fan.......................................................................................................................91
Contents
ii

Removing the Main Drive Unit..............................................................................................................91
Removing the Duplex Drive Unit...........................................................................................................93
Removing the Cassette Pickup Solenoid...............................................................................................93
Removing the Multi-purpose Solenoid.................................................................................................. 94
Removing the Duplex Reversal Solenoid.............................................................................................. 94
Removing the Wireless LAN PCB.........................................................................................................95
Laser Exposure System.................................................................................................................... 96
Removing the Laser Scanner Unit........................................................................................................ 96
Image Forming System..................................................................................................................... 97
Removing the Transfer Roller...............................................................................................................97
Removing the Registration Unit............................................................................................................97
Fixing System....................................................................................................................................98
Removing the Fixing Unit.....................................................................................................................98
Paper Pickup/Transport/Output System..........................................................................................100
Removing the Cassette Pickup Roller.................................................................................................100
Removing the Cassette Separation Pad..............................................................................................100
Removing the Multi-purpose Pickup Roller..........................................................................................101
Removing the Multi-purpose Separation Pad.......................................................................................101
5. Troubleshooting...........................................................................................103
Trouble Shooting.............................................................................................................................104
Test Pages....................................................................................................................................... 104
Confirming nip width..........................................................................................................................106
Version Upgrade............................................................................................................................. 108
Overview.......................................................................................................................................... 108
Version Upgrade Using UST.............................................................................................................. 108
Upgrading via Internet....................................................................................................................... 112
Corrective Actions........................................................................................................................... 114
Image Defects...................................................................................................................................114
Debug Log ......................................................................................................................................120
Function Overview.............................................................................................................................120
Conditions for collecting logs..............................................................................................................120
Collection procedure..........................................................................................................................120
6. Error/Jam/Alarm........................................................................................... 122
Error Codes.....................................................................................................................................123
Overview.......................................................................................................................................... 123
Error Codes...................................................................................................................................... 123
JamCode..........................................................................................................................................126
Alarm Code.......................................................................................................................................126
7. Service Mode................................................................................................ 128
Service Mode.................................................................................................................................. 129
Overview.......................................................................................................................................... 129
COPIER........................................................................................................................................... 133
TESTMODE......................................................................................................................................151
SERVICE REPORT...........................................................................................................................153
Contents
iii

APPENDICES....................................................................................................154
Service Tools...................................................................................................................................155
Special Tools.................................................................................................................................... 155
Solvents and Oil List..........................................................................................................................155
General Circuit Diagram..................................................................................................................156
Print Sequence................................................................................................................................157
Backup Data....................................................................................................................................158
Soft Counter Specifications.............................................................................................................160
Contents
iv

Safety Precautions
Laser Safety..........................................2
Toner Safety..........................................2
Notes When Handling a Lithium
Battery............................................... 3
Notes on Assembly/Disassembly..........3

Laser Safety
Since radiation emitted inside the machine is completely confined within protective housings and external covers, the laser beam
cannot escape from the machine during any phase of user operation.
Therefore this machine is classified in Class 1 laser products that are regarded as safe during normal use according to
International Standard IEC60825-1.
How to Handle the Laser Scanner Unit
This machine is classified in Class 1 laser products.
However, inside the scanner unit, there is source of Class 3B laser beam and the laser beam is hazardous when entered into an
eye. So, be sure not to disassemble the laser scanner unit. No adjustment can be made to the laser scanner unit in this machine
in the field.
The label show in the following figure is attached on the laser scanner unit.
The following warnings are given to comply with Safety Principles (EN60950-1).
Diese Maschine ist der Klasse 1 der Laserprodukte zugeordnet.
Innerhalb der Scannereinheit befindet sich jedoch die Laserstrahlquelle der Klasse 3B und es ist gefährlich, wenn dieser Strahl
in die Augen gerät. Die Laserscannereinheit darf unter keinen Umständen entfernt werden.
Es dürfen in diesem Umfeld der Maschine keine Justagen an der Laserscannereinheit vorgenommen werden.Das Etikett in
folgendem Bild ist auf der Laserscannereinheit angebrachtt.
Toner Safety
About Toner
Toner is a nontoxic matter composed of plastic, iron and a trace of pigments.
CAUTION:
Never throw toner in flames to avoid explosion.
Handling Adhered Toner
• Use dry tissue paper to wipe off toner adhered to skin or clothes and wash in water.
• Never use warm water for cleaning up toner to prevent toner particles from being gelated to soak into fibers permanently.
• Toner particles are reactive with vinyl polymers. Avoid contacting these materials.
Safety Precautions
2

Notes When Handling a Lithium Battery
CAUTION:
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.
The following warnings are given to comply with Safety Principles (EN60950-1).
CAUTION:
Wenn mit dem falschen Typ ausgewechselt, besteht Explosionsgefahr.
Gebrauchte Batterien gemäß der Anleitung beseitigen.
Notes on Assembly/Disassembly
Follow the items below to assemble/disassemble the device.
1. Disconnect the power plug to avoid any potential dangers during assembling/disassembling works.
2. If not specially instructed, reverse the order of disassembly to reinstall.
3. Ensure to use the right screw type (length, diameter, etc.) at the right position when assembling.
4. To keep electric conduction, binding screws with washers are used to attach the grounding wire and the varistor. Ensure to
use the right screw type when assembling.
5. Unless it is specially needed, do not operate the device with some parts removed.
6. Never remove the paint-locked screws when disassembling.
Safety Precautions
3

Product Overview
1Product Lineups.................................... 5
Features................................................6
Product Specifications...........................7
List of Parts......................................... 10
Operation............................................ 12

Product Lineups
Main unit
Function LBP253
Appearance
Copy No
Print Yes
FAX No
Remote UI Yes
Automatic 2-sided Print
(60 to 120g / m2 paper )
Yes
MEAP No
Network Yes
WLAN Yes
Options
No. Name Description Remarks
[1] Paper FeederUnit PF-44 Approx. 500 Sheets (Plain paper 80g/ m2)-
1. Product Overview
5

Features
Features
1. Small and high-speed printer
The printer is compact size that realizes print speed of approximately 33 pages per minute.
2. Automatic duplex print
Automatic two-sided printing is available with standard equipped duplex unit.
3. High-volume continuous printing
In addition to the standard equipped universal cassette (holds up to 250 sheets of 80g/m2 paper) and Multi-purpose tray
(holds up to 50 sheets of 80g/m2 paper), the printer supports optional paper feeder (holds up to 500 sheets of 80g/m2 paper)
for a total capacity of 800 sheets. Thus high-volume continuous printing is available.
4. LUI(display)
• LUI(display )touch-panel display
• The display is a touch panel, allowing you to operate directly on the screen.
1. Product Overview
6

Product Specifications
Item Specification/function
Installation Format Desktop type page printer
Photosensitive Element OPC drum
Exposure Principle Laser beam method
Development Principle Jumping development
Transfer Principle Roller transfer
Separation Principle Self stripping
Cassette Feed Principle Separate design
Multi Purpose Tray Principle Pad separation
Drum Cleaning Principle Rubber blade cleaning
Fixing Method On-demand
Paper Output Principle Face-down/Face-up
Toner Supply Principle Toner cartridgesNumber
Warm-up Time From power ON: max. 16 seconds
Recovery Time Approx. 9 seconds or less
Print Area Top 5.0 mm, Bottom 5.0 mm, Left/Right 5.0 mm
(Envelope: Top/Bottom/Right/Left 10.0 mm)
Printing Resolution 600dpi
First Print Output Time
(1-sided printing on A4 size
paper, with the output tray
used)
Approx. 6 seconds or less
Printing Speed
(Plain paper (60 to 89 g/m²),
A4 continuous printing)
1-sided printing: 33 pages/minute2-sided printing: 16.8 pages/minute (8.4 sheets/minute)
Cassette Paper Size Standard sizes: A4, B5, A5, A6, Legal, Letter, Executive
Custom size range (user-specified):
(Width 105.0 to 215.9 mm, Length 148.0 to 355.6 mm)
Multi Purpose Paper Size Standard sizes: A4, B5, A5, A6, Legal, Letter, Executive, Postcard, Reply-paid Postcard, Four-side
Postcard, Japanese Western-style Envelope Size No. 3, Envelope Size No. 3
Custom size range (user-specified):
(Width 76.2 to 215.9 mm, Length 127.0 to 355.6 mm)
Cassette Paper Type Plain paper (60 to 89 g/m2), Heavy paper (90 to 120 g/m2)
Multi Purpose Paper Type Plain paper (60 to 89 g/m2), Heavy paper (90 to 163 g/m2), OHP film, label paper, postcard, envelope
Cassette Paper Capacity Approx. 250 sheets (Plain paper 80 g/m2)
Multi Purpose Paper Capacity Approx. 50 sheets (Plain paper 80 g/m2)
Output Tray Paper Capacity Face-down output: approx. 150 sheets (80 g/m2), face-up output: 1 sheet
Duplex Printing Principle Auto Duplex
Interfaces USB: HI-Speed USB/USB2.0
Network: 10 Base-T/100BASE-T/1000Base-T common (RJ-45)
Full duplex/half duplex
Memory Capacity 1GB
Hard Disk Capacity Standard: None, Option: None
Ambient Temperature Range
for Use
Temperature: 10 to 30 °C
Ambient Humidity Range for
Use
Humidity: 20 to 80% RH (no condensation)
1. Product Overview
7

Item Specification/function
Noise
(measured in accordance with
ISO 7779, declared noise
emission in accordance with
ISO 9296)
LwAd (declared A-weighted sound power level (1 B = 10 dB))
During standby: Inaudible
*
During printing: 6.8 B or less
LpAm (declared A-weighted sound pressure level (bystander position))
During standby: Inaudible
*
During printing: 54 dB
*:Indicates that the sound pressure level of each bystander position is below the ISO 7779 absolute
criteria for the background noise level.
Power Supply 120 to 127 V, 60 Hz
220 to 240 V (± 10 %), 50/60 Hz (± 2 Hz)
Power Consumption*(at 68 °F
(20 °C))
*:Even if the machine is turned
OFF, a slight amount of power
is still consumed while the
power plug is plugged into the
AC power outlet. To stop pow-
er consumption completely,
unplug the power plug from
the AC power outlet.
220 to 240 V, 50/60 Hz
• Maximum: 1,150 W or less
• During operation: Approx. 550 W
• During standby: Approx. 12.1 W
• During sleep mode:
• Approx. 0.9 W (USB connection)
• Approx. 1.0 W (wired LAN connection)
• Approx. 1.5 W (wireless LAN connection)
• When the power switch is turned OFF: 0.1 W or less
120 to 127 V, 60 Hz
• Maximum: 990 W or less
• During operation: Approx. 570 W
• During standby: Approx. 11.7 W
• During sleep mode:
• Approx. 0.8 W (USB connection)
• Approx. 1.0 W (wired LAN connection)
• Approx. 1.6 W (wireless LAN connection)
• When the power switch is turned OFF: 0.1 W or less
Dimensions 403(W)×376(D)×320(H)mm
Weight Printer main unit: approx. 11.5 kg (excl. toner cartridges)
Option Paper Feeder
Wireless LAN
Item Specification/function
Standard IEEE 802.11g, IEEE 802.11b, IEEE 802.11n
Transmission Scheme DS-SS System, OFDM System
Frequency Range 2,412 to 2,472 MHz
Communication Mode Infrastructure Mode
Security WEP, WPA-PSK (TKIP/AES-CCMP), WPA2-PSK (TKIP/AES-CCMP)
Connection Method WPS (Wi-Fi Protected Setup), Manual setup
Supported Paper Sizes
Paper sizes that can be loaded in the paper drawer, the multi-purpose tray, and optional paper feeders are listed below.
Yes : Available - : Unavailable
Paper Size Paper Drawer Multi-Purpose Tray Automatic 2-Sided Print-
ing *1
A4 (210.0 × 297.0 mm) Yes Yes Yes
B5 (182.0 × 257.0 mm) Yes Yes -
A5 (148.0 × 210.0 mm) Yes Yes -
A6 (105.0 × 148.0 mm) Yes Yes -
Legal (LGL) (215.9 × 355.6 mm) Yes Yes Yes
Letter (LTR) (215.9 × 279.4 mm) Yes Yes Yes
Statement (STMT) (139.7 × 215.9 mm) Yes Yes -
Executive (EXEC) (184.1 × 266.7 mm) Yes Yes -
Oficio (215.9 × 317.5 mm) Yes Yes Yes *2
Oficio (Brazil) (215.9 × 355.0 mm) Yes Yes Yes *2
1. Product Overview
8

Paper Size Paper Drawer Multi-Purpose Tray Automatic 2-Sided Print-
ing *1
Oficio (Mexico) (215.9 × 341.0 mm) Yes Yes Yes *2
Letter (Government) (203.2 × 266.7 mm) Yes Yes -
Legal (Government) (203.2 × 330.2 mm) Yes Yes -
Foolscap (215.9 × 330.2 mm) Yes Yes Yes *2
Foolscap (Australia) (206.0 × 337.0 mm) Yes Yes -
Legal (India) (215.0 × 345.0 mm) Yes Yes *2
Envelope No.10 (COM10) (104.7 x 241.3 mm) - Yes -
Envelope Monarch (98.4 x 190.5 mm) - Yes -
C5 (162.0 x 229.0 mm) - Yes -
Envelope DL (110.0 x 220.0 mm) - Yes -
3x5inch (76.2 x 127.0 mm) - Yes -
Custom Yes *3 Yes *4 -
*1 Automatic 2-sided printing is available without necessity of paper reloading.
*2 Set the paper size switch lever in the same position as that for Letter/Legal size.
*3 Custom size paper with width 105.0 to 216.0 mm and length 148.0 to 356.0 mm can be loaded.
*4 Custom size paper with width 76.2 to 216.0 mm and length 127.0 to 356.0 mm can be loaded.
Paper Type and Paper Source Capacity
Chlorine-free paper can be used with this machine.
Paper Type Paper Capacity for Paper Drawer Paper Capacity for Multi-Purpose
Tray
Plain paper * 60 to 89 g/m² 250 sheets 50 sheets
Heavy paper 90 to 120 g/m² * 200 sheets 40 sheets
121 to 163 g/m² - 25 sheets
Recycled paper * 60 to 89 g/m² 250 sheets 50 sheets
Color paper * 60 to 89 g/m² 250 sheets 50 sheets
Label - 20 sheets
Envelope - 5 sheets
* Automatic 2-sided printing is available without replacing paper.
1. Product Overview
9

List of Parts
External View
[10]
[11]
[18]
[19]
[15]
[16]
[17]
[12]
[13] [14]
[1]
[3] [5]
[7]
[9]
[6] [4]
[8]
[2]
No. Name No. Name
[1] Auxiliary Tray [11] Rear Cover
[2] Multi-purpose Tray [12] Face-up Output Tray
[3] Front Cover [13] Pressure Release Cover
[4] Open Button [14] Left Cover
[5] Upper Cover [15] USB Host
[6] Control Panel [16] USB Device
[7] Right Cover [17] LAN Connector
[8] Power Switch [18] Duplex Unit Cover
[9] Face-down Output Tray Cover [19] Power Socket
[10] Paper Cassette
1. Product Overview
10

Cross Sectional View
[10]
[1]
[11]
[2]
[12]
[3]
[13]
[4]
[14]
[5]
[15]
[6]
[16]
[7]
[17]
[8]
[18]
[9]
[19][20]
No. Name No. Name
[1] Fixing Delivery Roller [11] Multi-purpose Tray Pickup Roller
[2] Face-down Delivery Roller [12] Multi-purpose Tray Separation
Pad
[3] Pressure Roller [13] Registration Roller
[4] Fixing Film Unit [14] Feed Roller
[5] Fixing Unit [15] Cassette Pickup Roller
[6] Transfer Roller [16] Cassette Separation Pad
[7] Photosensitive Drum [17] Cassette
[8] Laser Scanner Unit [18] Duplex Re-pickup Roller
[9] Cartridge [19] Duplex Feed Unit
[10] Registration Shutter [20] Duplex Feed Roller
1. Product Overview
11

Operation
Operation Panel
No. Name No. Name
1 Display 10 [ID] key
2 [Home] key 11 [Clear] key
3 [Reset] key 12 [Counter Check] key
4 [Back] key 13 [Stop] key
5 Numeric keys ([0]-[9] keys) 14 [#] key
6 [*] key 15 [Processing/Data] indicator
7 NFC（Near Field Communication）mark 16 Wi-Fi indicator
8 [Energy Saver] key 17 [Error] indicator
9 [Status Monitor] key 18 [Main Power] indicator
1. Product Overview
12

Technology
2Basic Operation...................................14
Sequence of Operation....................... 15
Laser Exposure System......................16
Image Formation System....................17
Fixing System......................................22
Pickup Feeding System...................... 26
Controller System................................29
Embedded RDS.................................. 34
Setting Information Export/Import
Function (DCM)............................... 44