Canon LaserBase MF3220 Series User manual

Mar 31 2006
Service Manual
MF3220 Series
LaserBase MF3220

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 written consent of Canon Inc.
COPYRIGHT © 2001 CANON INC.
Printed in Japan
Caution
Use of this manual should be strictly supervised to avoid disclosure of confidential information.

Introduction
Symbols Used
This documentation uses the following symbols to indicate special information:
Symbol Description
Indicates an item of a non-specific nature, possibly classified as Note, Caution, or Warning.
Indicates an item requiring care to avoid electric shocks.
Indicates an item requiring care to avoid combustion (fire).
Indicates an item prohibiting disassembly to avoid electric shocks or problems.
Indicates an item requiring disconnection of the power plug from the electric outlet.
Indicates an item intended to provide notes assisting the understanding of the topic in question.
Indicates an item of reference assisting the understanding of the topic in question.
Provides a description of a service mode.
Provides a description of the nature of an error indication.
Memo
REF.

Introduction
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 refer-
ence 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, how-
ever, 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 com-
municated 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."

Contents
Contents
Chapter 1 PRODUCT DESCRIPTION
1.1 Product Specifications ................................................................................................................................1- 1
1.1.1 Product Specifications(EU/AE/CN/KOR)................................................................................................................. 1- 1
1.2 Detailed Specifications ...............................................................................................................................1- 1
1.2.1 Printing Speed ........................................................................................................................................................ 1- 1
1.2.2 Stack Upon Delivery ................................................................................................................................................ 1- 2
1.2.3 System Requirements for Printer Driver .................................................................................................................. 1- 2
1.3 Names of Parts...........................................................................................................................................1- 2
1.3.1 External View........................................................................................................................................................... 1- 2
1.3.2 Operation panel ....................................................................................................................................................... 1- 3
1.4 Safety .........................................................................................................................................................1- 4
1.4.1 Safety of Laser Light................................................................................................................................................1- 4
1.4.2 Regulations Under the Center for Devices and Radiological Health (CDRH) .........................................................1- 4
1.4.3 Handling the Laser Unit ........................................................................................................................................... 1- 4
1.4.4 Safety of Toner ........................................................................................................................................................ 1- 4
1.4.5 Backup Battery ....................................................................................................................................................... 1- 5
Chapter 2 TECHNICAL REFERENCE
2.1 Document Feed and Exposure System ......................................................................................................2- 1
2.1.1 Overview/Configuration ........................................................................................................................................... 2- 1
2.1.1.1 Overview .................................................................................................................................................................................. 2- 1
2.2 Laser Exposure ..........................................................................................................................................2- 2
2.2.1 Overview/Configuration ........................................................................................................................................... 2- 2
2.2.1.1 Overview .................................................................................................................................................................................. 2- 2
2.3 Image Formation ........................................................................................................................................2- 3
2.3.1 Overview/Configuration ........................................................................................................................................... 2- 3
2.3.1.1 Overview .................................................................................................................................................................................. 2- 3
2.4 Pickup and Feed System............................................................................................................................2- 4
2.4.1 Overview/Configuration ........................................................................................................................................... 2- 4
2.4.1.1 Overview .................................................................................................................................................................................. 2- 4
2.4.2 Other Control ........................................................................................................................................................... 2- 4
2.4.2.1 Manual Pickup Control ............................................................................................................................................................. 2- 4
2.4.2.2 Cassette Pickup Control .......................................................................................................................................................... 2- 4
2.4.3 Detection Jams........................................................................................................................................................ 2- 5
2.4.3.1 Jam Detection Outline.............................................................................................................................................................. 2- 5
2.4.3.2 Delay Jams .............................................................................................................................................................................. 2- 5
2.4.3.3 Stationary Jams ....................................................................................................................................................................... 2- 5
2.4.3.4 Other Jams .............................................................................................................................................................................. 2- 5
2.5 Fixing Unit...................................................................................................................................................2- 6
2.5.1 Overview/Configuration ........................................................................................................................................... 2- 6
2.5.1.1 Overview .................................................................................................................................................................................. 2- 6
2.5.2 Protection Function.................................................................................................................................................. 2- 6
2.5.2.1 Protective Mechanisms............................................................................................................................................................ 2- 6
2.5.2.2 Detecting a Fault in the Fixing Assembly................................................................................................................................. 2- 6
2.6 External and Controls .................................................................................................................................2- 7
2.6.1 Power Supply ..........................................................................................................................................................2- 7
2.6.1.1 Backup Battery......................................................................................................................................................................... 2- 7
Chapter 3 DISASSEMBLY AND ASSEMBLY

Contents
3.1 EXTERNAL AND CONTROLS SYSTEM ................................................................................................... 3- 1
3.1.1 Front Cover ..............................................................................................................................................................3- 1
3.1.1.1 Removing the Cassette............................................................................................................................................................ 3- 1
3.1.1.2 Removing the front cover ......................................................................................................................................................... 3- 1
3.1.2 Rear Cover...............................................................................................................................................................3- 1
3.1.2.1 Removing the Cassette............................................................................................................................................................ 3- 1
3.1.2.2 Removing the front cover ......................................................................................................................................................... 3- 1
3.1.2.3 Removing the right cover ......................................................................................................................................................... 3- 1
3.1.2.4 Removing the left cover ........................................................................................................................................................... 3- 1
3.1.2.5 Removing the rear cover.......................................................................................................................................................... 3- 1
3.1.3 Top Cover ................................................................................................................................................................3- 2
3.1.3.1 Removing the Cassette............................................................................................................................................................ 3- 2
3.1.3.2 Removing the front cover ......................................................................................................................................................... 3- 2
3.1.3.3 Removing the right cover ......................................................................................................................................................... 3- 2
3.1.3.4 Removing the left cover ........................................................................................................................................................... 3- 2
3.1.3.5 Removing the rear cover.......................................................................................................................................................... 3- 2
3.1.3.6 Removing the Scanner Unit ..................................................................................................................................................... 3- 2
3.1.3.7 Removing the top cover ........................................................................................................................................................... 3- 3
3.1.4 Right Cover ..............................................................................................................................................................3- 3
3.1.4.1 Removing the Cassette............................................................................................................................................................ 3- 3
3.1.4.2 Removing the front cover ......................................................................................................................................................... 3- 3
3.1.4.3 Removing the right cover ......................................................................................................................................................... 3- 3
3.1.5 Left Cover ................................................................................................................................................................3- 3
3.1.5.1 Removing the Cassette............................................................................................................................................................ 3- 3
3.1.5.2 Removing the left cover ........................................................................................................................................................... 3- 3
3.1.6 Operation Panel Unit................................................................................................................................................3- 4
3.1.6.1 Removung the Cassette .......................................................................................................................................................... 3- 4
3.1.6.2 Removing the front cover ......................................................................................................................................................... 3- 4
3.1.6.3 Removing the right cover ......................................................................................................................................................... 3- 4
3.1.6.4 Removing the left cover ........................................................................................................................................................... 3- 4
3.1.6.5 Removing the rear cover.......................................................................................................................................................... 3- 4
3.1.6.6 Removing the Scanner Unit ..................................................................................................................................................... 3- 5
3.1.6.7 Removing the Board Unit ......................................................................................................................................................... 3- 5
3.1.6.8 Removing the Operation Panel Unit ........................................................................................................................................ 3- 5
3.1.7 SCNT Board.............................................................................................................................................................3- 6
3.1.7.1 Removing the Cassette............................................................................................................................................................ 3- 6
3.1.7.2 Removing the front cover ......................................................................................................................................................... 3- 6
3.1.7.3 Removing the right cover ......................................................................................................................................................... 3- 6
3.1.7.4 Removing the left cover ........................................................................................................................................................... 3- 6
3.1.7.5 Removing the rear cover.......................................................................................................................................................... 3- 6
3.1.7.6 Removing the Scanner Unit ..................................................................................................................................................... 3- 6
3.1.7.7 Removing the SCNT Board ..................................................................................................................................................... 3- 7
3.1.8 ECNT Board.............................................................................................................................................................3- 7
3.1.8.1 Removing the Cassette............................................................................................................................................................ 3- 7
3.1.8.2 Removing the front cover ......................................................................................................................................................... 3- 7
3.1.8.3 Removing the left cover ........................................................................................................................................................... 3- 7
3.1.8.4 Removing the ECNT Board ..................................................................................................................................................... 3- 7
3.1.9 Power Supply PCB ..................................................................................................................................................3- 8
3.1.9.1 Removing the Cassette............................................................................................................................................................ 3- 8
3.1.9.2 Removing the front cover ......................................................................................................................................................... 3- 8
3.1.9.3 Removing the right cover ......................................................................................................................................................... 3- 8
3.1.9.4 Removing the left cover ........................................................................................................................................................... 3- 8
3.1.9.5 Removing the rear cover.......................................................................................................................................................... 3- 8
3.1.9.6 Removing the Power Supply Shield Plate ............................................................................................................................... 3- 8
3.1.9.7 Removing the Power Supply Assembly ................................................................................................................................... 3- 9
3.1.9.8 Removing the Power Supply Board ......................................................................................................................................... 3- 9
3.1.10 High-voitage Power Supply PCB ...........................................................................................................................3- 9
3.1.10.1 Removing the Cassette.......................................................................................................................................................... 3- 9
3.1.10.2 Removing the front cover ....................................................................................................................................................... 3- 9
3.1.10.3 Removing the right cover ....................................................................................................................................................... 3- 9

Contents
3.1.10.4 Removing the left cover ....................................................................................................................................................... 3- 10
3.1.10.5 Removing the rear cover...................................................................................................................................................... 3- 10
3.1.10.6 Removing the Power Supply Shield Plate............................................................................................................................ 3- 10
3.1.10.7 Removing the Power Supply Board ..................................................................................................................................... 3- 10
3.1.10.8 Removing the High-Voltage Power Supply Board ............................................................................................................... 3- 11
3.1.11 Top Sensor .......................................................................................................................................................... 3- 11
3.1.11.1 Removing the Cassette ........................................................................................................................................................ 3- 11
3.1.11.2 Removing the front cover ..................................................................................................................................................... 3- 11
3.1.11.3 Removing the right cover ..................................................................................................................................................... 3- 11
3.1.11.4 Removing the left cover ....................................................................................................................................................... 3- 11
3.1.11.5 Removing the rear cover...................................................................................................................................................... 3- 12
3.1.11.6 Removing the Scanner Unit ................................................................................................................................................. 3- 12
3.1.11.7 Removing the top cover ....................................................................................................................................................... 3- 12
3.1.11.8 Removing the Right Frame .................................................................................................................................................. 3- 12
3.1.11.9 Removing the Plate.............................................................................................................................................................. 3- 12
3.1.11.10 Removing the Left Frame................................................................................................................................................... 3- 13
3.1.11.11 Removing the Power Supply Shield Plate.......................................................................................................................... 3- 13
3.1.11.12 Removing the Power Supply Assembly ............................................................................................................................. 3- 13
3.1.11.13 Removing the top sensor ................................................................................................................................................... 3- 13
3.1.12 Paper Delivery Sensor......................................................................................................................................... 3- 14
3.1.12.1 Removing the Cassette ........................................................................................................................................................ 3- 14
3.1.12.2 Removing the front cover ..................................................................................................................................................... 3- 14
3.1.12.3 Removing the right cover ..................................................................................................................................................... 3- 14
3.1.12.4 Removing the left cover ....................................................................................................................................................... 3- 14
3.1.12.5 Removing the rear cover...................................................................................................................................................... 3- 14
3.1.12.6 Removing the Power Supply Shield Plate............................................................................................................................ 3- 14
3.1.12.7 Removing the Scanner Unit ................................................................................................................................................. 3- 15
3.1.12.8 Removing the Plate.............................................................................................................................................................. 3- 15
3.1.12.9 Removing the Paper Delivery Sensor .................................................................................................................................. 3- 15
3.2 Document Feed/Exposure System ...........................................................................................................3- 15
3.2.1 Scanner Unit.......................................................................................................................................................... 3- 15
3.2.1.1 Removing the Cassette.......................................................................................................................................................... 3- 15
3.2.1.2 Removing the front cover ....................................................................................................................................................... 3- 15
3.2.1.3 Removing the right cover ....................................................................................................................................................... 3- 16
3.2.1.4 Removong the left cover ........................................................................................................................................................ 3- 16
3.2.1.5 Removing the rear cover........................................................................................................................................................ 3- 16
3.2.1.6 Removing the Scanner Unit ................................................................................................................................................... 3- 16
3.2.2 Scanner Cover Unit ............................................................................................................................................... 3- 17
3.2.2.1 Removing the Cassette.......................................................................................................................................................... 3- 17
3.2.2.2 Removing the front cover ....................................................................................................................................................... 3- 17
3.2.2.3 Removing the right cover ....................................................................................................................................................... 3- 17
3.2.2.4 Removing the left cover ......................................................................................................................................................... 3- 17
3.2.2.5 Removing the rear cover........................................................................................................................................................ 3- 17
3.2.2.6 Removing the Scanner Unit ................................................................................................................................................... 3- 17
3.2.2.7 Removing the Operation Panel Unit ...................................................................................................................................... 3- 18
3.2.2.8 Scanner cover unit ................................................................................................................................................................. 3- 18
3.2.3 Contact Sensor...................................................................................................................................................... 3- 18
3.2.3.1 Removing the Cassette.......................................................................................................................................................... 3- 18
3.2.3.2 Removing the front cover ....................................................................................................................................................... 3- 18
3.2.3.3 Removing the right cover ....................................................................................................................................................... 3- 18
3.2.3.4 Removing the left cover ......................................................................................................................................................... 3- 19
3.2.3.5 Removing the rear cover........................................................................................................................................................ 3- 19
3.2.3.6 Removing the Scanner Unit ................................................................................................................................................... 3- 19
3.2.3.7 Removing the Operation Panel Unit ...................................................................................................................................... 3- 19
3.2.3.8 Removing the Scanner Cover Unit ........................................................................................................................................ 3- 20
3.2.3.9 Removing the Flatbed Motor Unit .......................................................................................................................................... 3- 20
3.2.3.10 Removing the Contact Sensor ............................................................................................................................................. 3- 20
3.2.4 Flatbed Motor Unit ................................................................................................................................................. 3- 20
3.2.4.1 Removing the Cassette.......................................................................................................................................................... 3- 20
3.2.4.2 Removing the front cover ....................................................................................................................................................... 3- 20
3.2.4.3 Removing the right cover ....................................................................................................................................................... 3- 21

Contents
3.2.4.4 Removing the left cover ......................................................................................................................................................... 3- 21
3.2.4.5 Removing the rear cover........................................................................................................................................................ 3- 21
3.2.4.6 Removing the Scanner Unit ................................................................................................................................................... 3- 21
3.2.4.7 Removing the Operation Panel Unit ...................................................................................................................................... 3- 22
3.2.4.8 Removing the Scanner Cover Unit ........................................................................................................................................ 3- 22
3.2.4.9 Removing the Flatbed Motor Unit .......................................................................................................................................... 3- 22
3.3 LASER EXPOSURE SYSTEM ................................................................................................................. 3- 22
3.3.1 Laser/Scanner Unit ................................................................................................................................................3- 22
3.3.1.1 Removing the Cassette.......................................................................................................................................................... 3- 22
3.3.1.2 Removing the front cover ....................................................................................................................................................... 3- 22
3.3.1.3 Removing the right cover ....................................................................................................................................................... 3- 23
3.3.1.4 Removing the left cover ......................................................................................................................................................... 3- 23
3.3.1.5 Removing the rear cover........................................................................................................................................................ 3- 23
3.3.1.6 Removing the Scanner Unit ................................................................................................................................................... 3- 23
3.3.1.7 Removing the top cover ......................................................................................................................................................... 3- 24
3.3.1.8 Removing the Laser/Scanner Unit ......................................................................................................................................... 3- 24
3.4 IMAGE FORMATION SYSTEM................................................................................................................ 3- 24
3.4.1 Transfer Charging Roller........................................................................................................................................3- 24
3.4.1.1 Removing the Transfer Charging Roller ................................................................................................................................ 3- 24
3.5 PICKUP AND FEEDING SYSTEM........................................................................................................... 3- 24
3.5.1 Cassette Pickup Roller...........................................................................................................................................3- 24
3.5.1.1 Removing the Cassette.......................................................................................................................................................... 3- 24
3.5.1.2 Removing the front cover ....................................................................................................................................................... 3- 24
3.5.1.3 Removing the right cover ....................................................................................................................................................... 3- 25
3.5.1.4 Removing the left cover ......................................................................................................................................................... 3- 25
3.5.1.5 Removing the rear cover........................................................................................................................................................ 3- 25
3.5.1.6 Removing the Scanner Unit ................................................................................................................................................... 3- 25
3.5.1.7 Removing the top cover ......................................................................................................................................................... 3- 25
3.5.1.8 Removing the Right Frame .................................................................................................................................................... 3- 26
3.5.1.9 Removing the Plate................................................................................................................................................................ 3- 26
3.5.1.10 Removing the Left Frame..................................................................................................................................................... 3- 26
3.5.1.11 Removing the Power Supply Shield Plate............................................................................................................................ 3- 26
3.5.1.12 Removing the Power Supply Assembly ............................................................................................................................... 3- 26
3.5.1.13 Removing the Gear Unit....................................................................................................................................................... 3- 27
3.5.1.14 Removing the Tooth-Missing Gear ...................................................................................................................................... 3- 27
3.5.2 Cassette Pickup Solenoid ......................................................................................................................................3- 27
3.5.2.1 Removing the Cassette.......................................................................................................................................................... 3- 27
3.5.2.2 Removing the front cover ....................................................................................................................................................... 3- 27
3.5.2.3 Removing the right cover ....................................................................................................................................................... 3- 27
3.5.2.4 Removing the left cover ......................................................................................................................................................... 3- 28
3.5.2.5 Removing the rear cover........................................................................................................................................................ 3- 28
3.5.2.6 Removing the Scanner Unit ................................................................................................................................................... 3- 28
3.5.2.7 Removing the top cover ......................................................................................................................................................... 3- 28
3.5.2.8 Removing the Right Frame .................................................................................................................................................... 3- 29
3.5.2.9 Removing the Plate................................................................................................................................................................ 3- 29
3.5.2.10 Removing the Left Frame..................................................................................................................................................... 3- 29
3.5.2.11 Removing the Power Supply Shield Plate............................................................................................................................ 3- 29
3.5.2.12 Removing the Power Supply Assembly ............................................................................................................................... 3- 29
3.5.2.13 Removing the Cassette Pickup Solenoid ............................................................................................................................. 3- 30
3.5.3 Cassette Separation Pad.......................................................................................................................................3- 30
3.5.3.1 Removing the Cassette.......................................................................................................................................................... 3- 30
3.5.3.2 Removing the Rear of the Cassette....................................................................................................................................... 3- 30
3.5.3.3 Removing the Cassette Separation Pad................................................................................................................................ 3- 30
3.5.4 Paper Feed Roller..................................................................................................................................................3- 30
3.5.4.1 Removing the Cassette.......................................................................................................................................................... 3- 30
3.5.4.2 Removing the front cover ....................................................................................................................................................... 3- 30
3.5.4.3 Removing the right cover ....................................................................................................................................................... 3- 30
3.5.4.4 Removing the left cover ......................................................................................................................................................... 3- 31
3.5.4.5 Removing the rear cover........................................................................................................................................................ 3- 31
3.5.4.6 Removing the Scanner Unit ................................................................................................................................................... 3- 31