Canon iR5055 User manual

Feb 29 2008
Service Manual
iR5075/5065/5055 Series

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 Introduction
1.1 System Construction ..................................................................................................................................1- 1
1.1.1 System Configuration with Pickup/Delivery Accessories (230V)EUR.....................................................................1- 1
1.1.2 System Configuration with Printing/Transmission Accessories (230V)EUR ...........................................................1-1
1.1.3 Functions and Printing/Transmission Accessories (230V) ......................................................................................1- 2
1.2 Product Specifications................................................................................................................................1- 3
1.2.1 Names of Parts........................................................................................................................................................1- 3
1.2.1.1 External view............................................................................................................................................................................ 1- 3
1.2.1.2 Cross-Section .......................................................................................................................................................................... 1- 5
1.2.2 Using the Machine...................................................................................................................................................1- 7
1.2.2.1 Turning On the Power Switch .................................................................................................................................................. 1- 7
1.2.2.2 Turning Off the Power Switch .................................................................................................................................................. 1- 7
1.2.2.3 Control Panel ........................................................................................................................................................................... 1- 9
1.2.3 User Mode Items.....................................................................................................................................................1- 9
1.2.3.1 Common Settings .................................................................................................................................................................... 1- 9
1.2.3.2 Timer Settings........................................................................................................................................................................ 1- 11
1.2.3.3 Adjustment/Cleaning..............................................................................................................................................................1- 11
1.2.3.4 Report Output ........................................................................................................................................................................ 1- 11
1.2.3.5 System Control Settings ........................................................................................................................................................1- 12
1.2.3.6 Copier Specifications ............................................................................................................................................................. 1- 14
1.2.3.7 Transmission/Reception Settings .......................................................................................................................................... 1- 15
1.2.3.8 Box Settings...........................................................................................................................................................................1- 16
1.2.3.9 Printer Settings ...................................................................................................................................................................... 1- 16
1.2.3.10 Address Book Settings.........................................................................................................................................................1- 18
1.2.3.11 Voice Guide Settings............................................................................................................................................................1- 19
1.2.4 Maintenance by the User.......................................................................................................................................1- 19
1.2.4.1 Cleaning.................................................................................................................................................................................1- 19
1.2.4.2 Checks...................................................................................................................................................................................1- 20
1.2.5 Safety ....................................................................................................................................................................1- 21
1.2.5.1 Safety of the Machine's Laser Unit ........................................................................................................................................1- 21
1.2.5.2 CDRH Regulations.................................................................................................................................................................1- 21
1.2.5.3 Handling the Machine's Laser Unit ........................................................................................................................................1- 22
1.2.5.4 Safety of Toner ......................................................................................................................................................................1- 22
1.2.6 Product Specifications...........................................................................................................................................1- 22
1.2.6.1 Product Specifications ...........................................................................................................................................................1- 22
1.2.7 Function List..........................................................................................................................................................1- 24
1.2.7.1 Paper Types........................................................................................................................................................................... 1- 24
1.2.7.2 Printing Speed ....................................................................................................................................................................... 1- 24
1.2.7.3 Paper Types/Printing Speed (K paper)..................................................................................................................................1- 25
Chapter 2 Installation
2.1 Making Pre-Checks ....................................................................................................................................2- 1
2.1.1 Selecting the installation space...............................................................................................................................2- 1
2.1.2 Combination Table of Accessories..........................................................................................................................2- 2
2.1.3 Checking the Contents............................................................................................................................................2- 3
2.2 Unpacking and Installation .........................................................................................................................2- 5
2.2.1 Unpacking and installation procedure .....................................................................................................................2- 5
2.2.2 Unpacking................................................................................................................................................................2- 5
2.2.3 Installation of Scanner.............................................................................................................................................2- 7
2.2.4 Installation of Fixing Assembly................................................................................................................................2- 7
2.2.5 Checking of Charging Assembly and Dustproof Glass ...........................................................................................2- 8
2.2.6 Installation of Developing Assembly........................................................................................................................2- 9

Contents
2.2.7 Installation of Pickup Assembly ............................................................................................................................2- 10
2.2.8 Attaching Deck Pressure Plate .............................................................................................................................2- 11
2.2.9 Setting Toner Container ........................................................................................................................................2- 11
2.2.10 Connecting the Cable...........................................................................................................................................2- 12
2.2.11 Checking the Environment Switch .......................................................................................................................2- 12
2.2.12 Attaching the Label ..............................................................................................................................................2- 13
2.2.13 Connecting the Power Cord ................................................................................................................................2- 13
2.2.14 Turning On the Main Power Switch......................................................................................................................2- 14
2.2.15 Toner Stirring .......................................................................................................................................................2- 14
2.2.16 Media Cassette Settings......................................................................................................................................2- 14
2.2.17 Index Paper Attachment.......................................................................................................................................2- 14
2.2.18 Changing the Media Size of the Front Deck (Left/Right)......................................................................................2- 15
2.2.19 Image/Operation Check in User Mode.................................................................................................................2- 15
2.2.20 Adjustment of Image Left End Margin..................................................................................................................2- 15
2.2.21 Adjustment of image leading edge margin...........................................................................................................2- 16
2.2.22 Mounting of the Host Machine .............................................................................................................................2- 16
2.3 Checking the Connection to the Network.................................................................................................2- 19
2.3.1 Overview................................................................................................................................................................2- 19
2.3.2 Checking the Connection to the Network...............................................................................................................2- 19
2.3.3 Using the Ping Command......................................................................................................................................2- 19
2.3.4 Making a Check Using the Remote Host Address.................................................................................................2- 19
2.4 Troubleshooting the Network ...................................................................................................................2- 19
2.4.1 Troubleshooting the Network ................................................................................................................................2- 19
2.4.2 Checking the Connection of the Network Cable ...................................................................................................2- 19
2.4.3 Making a Check Using a Loopback Address ........................................................................................................2- 19
2.4.4 Making a Check Using a Local Host Address .......................................................................................................2- 19
2.5 Relocating the Machine............................................................................................................................2- 20
2.5.1 Operation for Moving the Machine.........................................................................................................................2- 20
2.6 Installing the Copy Tray............................................................................................................................2- 20
2.6.1 Confirming the contents.........................................................................................................................................2- 20
2.6.2 Power off of the host machine ...............................................................................................................................2- 20
2.6.3 Installation procedure.............................................................................................................................................2- 20
2.7 Installing the Card Reader........................................................................................................................2- 22
2.7.1 Notice At Installation..............................................................................................................................................2- 22
2.7.2 Confirming the contents.........................................................................................................................................2- 22
2.7.3 Power off of the host machine ...............................................................................................................................2- 22
2.7.4 Installation procedure.............................................................................................................................................2- 22
2.7.5 Installing for imageWARE Accounting Manager....................................................................................................2- 24
2.8 Installing the Original Holder ....................................................................................................................2- 24
2.8.1 Checking Contents ................................................................................................................................................2- 24
2.8.2 Installation Procedure ...........................................................................................................................................2- 24
2.8.3 Checking Contents ................................................................................................................................................2- 25
2.8.4 Installation Procedure ...........................................................................................................................................2- 25
2.9 Installing the Reader Heater.....................................................................................................................2- 25
2.9.1 Checking the Contents...........................................................................................................................................2- 25
2.9.2 Power off of the host machine ...............................................................................................................................2- 25
2.9.3 Installation Procedure............................................................................................................................................2- 26
2.10 Installing the Cassette Heater ................................................................................................................2- 27
2.10.1 Checking Components.........................................................................................................................................2- 27
2.10.2 Power off of the host machine..............................................................................................................................2- 28
2.10.3 Installation Procedure of the Cassette Heater .....................................................................................................2- 28
2.11 Installing the Deck Heater ......................................................................................................................2- 30
2.11.1 Checking the Parts to Install ................................................................................................................................2- 30
2.11.2 Turning Off the Host Machine..............................................................................................................................2- 31
2.12 Installing the Deck Heater (Large Deck).................................................................................................2- 31

Contents
2.12.1 Checking the Parts to Install................................................................................................................................2- 31
2.12.2 Turning Off the Host Machine..............................................................................................................................2- 32
2.13 Installing the Voice Guidance Kit............................................................................................................2- 32
2.13.1 A point to keep in mind at installation..................................................................................................................2- 32
2.13.2 Checking the Contents ........................................................................................................................................2- 32
2.13.3 Power off of the host machine .............................................................................................................................2- 33
2.13.4 Installation Procedure..........................................................................................................................................2- 33
2.14 Installing the Wireless Network Interface Adapter..................................................................................2- 39
2.14.1 Points to Note When Installing.............................................................................................................................2- 39
2.14.2 Checking the Contents ........................................................................................................................................2- 39
2.14.3 Power off of the host machine .............................................................................................................................2- 39
2.14.4 Installation Procedure..........................................................................................................................................2- 39
2.14.5 Affixing the Label.................................................................................................................................................2- 41
Chapter 3 Basic Operation
3.1 Construction ...............................................................................................................................................3- 1
3.1.1 Functional Construction...........................................................................................................................................3- 1
3.1.2 Wiring Diagram of the Major PCBs..........................................................................................................................3- 1
3.1.3 Controlling the Main Motor (M2)..............................................................................................................................3- 2
3.2 Basic Sequence..........................................................................................................................................3- 3
3.2.1 Basic Sequence of Operation (at power-on; 30-sec start-up mode) .......................................................................3- 3
3.2.2 Basic Sequence of Operation (at power-on; low-temperature start-up mode)........................................................3-3
3.2.3 Basic Sequence of Operation (at power-on; high-humidity start-up mode).............................................................3- 4
3.2.4 Basic Sequence of Operation (at time of copying/printing) .....................................................................................3- 5
Chapter 4 Main Controller
4.1 Construction ...............................................................................................................................................4- 1
4.1.1 Construction and Mechanisms................................................................................................................................4- 1
4.2 Construction of the Electrical Circuitry........................................................................................................4- 1
4.2.1 Main Controller PCB................................................................................................................................................4- 1
4.2.2 HDD.........................................................................................................................................................................4- 2
4.3 Start-Up Sequence.....................................................................................................................................4- 4
4.3.1 Overview..................................................................................................................................................................4- 4
4.3.2 Start-Up Sequence..................................................................................................................................................4- 4
4.4 Shut-Down Sequence.................................................................................................................................4- 6
4.4.1 Overview..................................................................................................................................................................4- 6
4.4.2 Flow of Operation....................................................................................................................................................4- 6
4.5 Image Processing.......................................................................................................................................4- 6
4.5.1 Overview of the Image Flow....................................................................................................................................4- 6
4.5.2 Construction of the Image Processing Module........................................................................................................4- 7
4.5.3 Reader Unit Input Image Processing.......................................................................................................................4- 7
4.5.4 Compression/ Extension/ Editing Block...................................................................................................................4- 8
4.5.5 Printer unit Output Image Processing......................................................................................................................4- 8
4.6 Flow of Image Data ....................................................................................................................................4- 9
4.6.1 Flow of Image Data According to Copy Functions ..................................................................................................4- 9
4.6.2 Flow of Image Data for the Box Function................................................................................................................4- 9
4.6.3 Flow of Image Data for the SEND Function ..........................................................................................................4- 10
4.6.4 Flow of Image Data for the Fax Transmission.......................................................................................................4- 10
4.6.5 Flow of Image Data for the Fax Reception Function .............................................................................................4- 11
4.6.6 Flow of Image Data for the PDL Function .............................................................................................................4- 12
4.7 Parts Replacement Procedure .................................................................................................................4- 13
4.7.1 Main Controller Box...............................................................................................................................................4- 13
4.7.1.1 Before Removing the Main Controller Box.............................................................................................................................4- 13
4.7.1.2 Removing the Main Controller Box........................................................................................................................................4- 13

Contents
4.7.2 Main Controller PCB..............................................................................................................................................4- 13
4.7.2.1 Before Removing the Main Controller PCB ...........................................................................................................................4- 13
4.7.2.2 Removing the Main Controller PCB.......................................................................................................................................4- 13
4.7.2.3 When Replacing the Main Controller PCB............................................................................................................................. 4- 14
4.7.3 SDRAM..................................................................................................................................................................4- 14
4.7.3.1 Before Removing the SDRAM ............................................................................................................................................... 4- 14
4.7.3.2 Removing the SDRAM........................................................................................................................................................... 4- 14
4.7.4 Boot ROM..............................................................................................................................................................4- 14
4.7.4.1 Before Removing the Boot ROM ...........................................................................................................................................4- 14
4.7.4.2 Removing the Boot ROM.......................................................................................................................................................4- 14
4.7.5 HDD.......................................................................................................................................................................4- 15
4.7.5.1 Before Removing HDD ..........................................................................................................................................................4- 15
4.7.5.2 Removing the HDD................................................................................................................................................................4- 15
4.7.5.3 After Replacing the HDD........................................................................................................................................................4- 15
4.7.6 Video PCB .............................................................................................................................................................4- 15
4.7.6.1 Before Removing the Video PCB...........................................................................................................................................4- 15
4.7.6.2 Removing the Video PCB ...................................................................................................................................................... 4- 15
4.7.7 Controller Fan........................................................................................................................................................4- 16
4.7.7.1 Before Removing the Controller Cooling Fan........................................................................................................................ 4- 16
4.7.7.2 Removing the Controller Cooling Fan.................................................................................................................................... 4- 16
Chapter 5 Original Exposure System
5.1 Construction ...............................................................................................................................................5- 1
5.1.1 Specifications, Controls, and Functions...................................................................................................................5- 1
5.1.2 Major Components...................................................................................................................................................5- 1
5.1.3 Construction of the Control System.........................................................................................................................5- 2
5.1.4 Reader Controller PCB............................................................................................................................................5- 3
5.2 Basic Sequence .........................................................................................................................................5- 4
5.2.1 Basic Sequence of Operations ................................................................................................................................5- 4
5.2.2 Basic Sequence of Operation in Response to a Press on the Start Key.................................................................5- 5
5.3 Various Control...........................................................................................................................................5- 5
5.3.1 Controlling the Scanner Drive System.....................................................................................................................5- 5
5.3.1.1 Overview.................................................................................................................................................................................. 5- 5
5.3.1.2 Controlling the Scanner Motor ................................................................................................................................................. 5- 6
5.3.2 Enlargement/Reduction ...........................................................................................................................................5- 7
5.3.2.1 Changing the Magnification in Main Scanning Direction.......................................................................................................... 5- 7
5.3.2.2 Changing the Magnification in Sub Scanning Direction...........................................................................................................5- 7
5.3.3 Controlling the Scanning Lamp................................................................................................................................5- 8
5.3.3.1 Overview.................................................................................................................................................................................. 5- 8
5.3.3.2 Scanning Lamp........................................................................................................................................................................ 5- 8
5.3.3.3 Controlling the Activation......................................................................................................................................................... 5- 9
5.3.4 Detecting the Size of Originals.................................................................................................................................5- 9
5.3.4.1 Overview.................................................................................................................................................................................. 5- 9
5.3.4.2 Points of Measurement Used for Original Size Identification...................................................................................................5- 9
5.3.4.3 Overview of Operation ........................................................................................................................................................... 5- 10
5.3.5 Dirt Sensor Control ................................................................................................................................................5- 12
5.3.5.1 Dust Detection in Stream Reading Mode............................................................................................................................... 5- 12
5.3.5.2 White Plate Dust Detection Control ....................................................................................................................................... 5- 13
5.3.6 Image Processing..................................................................................................................................................5- 14
5.3.6.1 Overview................................................................................................................................................................................ 5- 14
5.3.6.2 CCD Drive.............................................................................................................................................................................. 5- 15
5.3.6.3 CCD Output Gain Correction, Offset Correction....................................................................................................................5- 15
5.3.6.4 CCD Output A/D Conversion.................................................................................................................................................5- 15
5.3.6.5 Outline of Shading Correction................................................................................................................................................ 5- 15
5.3.6.6 Shading Adjustment............................................................................................................................................................... 5- 16
5.3.6.7 Shading Correction................................................................................................................................................................5- 16
5.4 Parts Replacement Procedure .................................................................................................................5- 17
5.4.1 CCD Unit................................................................................................................................................................5- 17

Contents
5.4.1.1 Before Removing the CCD Unit.............................................................................................................................................5- 17
5.4.1.2 Removing the CCD Unit.........................................................................................................................................................5- 17
5.4.1.3 When Replacing the CCD Unit ..............................................................................................................................................5- 17
5.4.2 Copyboard glass....................................................................................................................................................5- 18
5.4.2.1 Removing the Copyboard Glass............................................................................................................................................5- 18
5.4.2.2 When Replacing the Copyboard Glass.................................................................................................................................. 5- 18
5.4.3 Scanning Lamp......................................................................................................................................................5- 18
5.4.3.1 Before Removing the Scanning Lamp ................................................................................................................................... 5- 18
5.4.3.2 Removing the Scanning Lamp............................................................................................................................................... 5- 18
5.4.3.3 When Replacing the Scanning Lamp.....................................................................................................................................5- 19
5.4.4 Reader Controller PCB..........................................................................................................................................5- 19
5.4.4.1 Before Removing the Reader Controller PCB .......................................................................................................................5- 19
5.4.4.2 Removing the Reader Controller PCB................................................................................................................................... 5- 19
5.4.4.3 After Replacing the Reader Controller PCB........................................................................................................................... 5- 20
5.4.5 Interface PCB........................................................................................................................................................5- 20
5.4.5.1 Before Removing the Interface PCB...................................................................................................................................... 5- 20
5.4.5.2 Removing the Interface PCB .................................................................................................................................................5- 20
5.4.6 Memory PCB.........................................................................................................................................................5- 21
5.4.6.1 Before Removing the Memory PCB.......................................................................................................................................5- 21
5.4.6.2 Removing the memory PCB ..................................................................................................................................................5- 21
5.4.7 Inverter PCB..........................................................................................................................................................5- 21
5.4.7.1 Before removing the inverter PCB ......................................................................................................................................... 5- 21
5.4.7.2 Removing the Inverter PCB...................................................................................................................................................5- 21
5.4.7.3 After Replacing the Inverter PCB........................................................................................................................................... 5- 22
5.4.8 Scanner Motor.......................................................................................................................................................5- 22
5.4.8.1 Before Removing the Scanner Motor.....................................................................................................................................5- 22
5.4.8.2 Removing the Scanner Motor ................................................................................................................................................ 5- 22
5.4.8.3 Mounting the Scanner Motor..................................................................................................................................................5- 23
5.4.9 ADF Open/Close Sensor.......................................................................................................................................5- 23
5.4.9.1 Before Removing the ADF Open/Close Sensor..................................................................................................................... 5- 23
5.4.9.2 Removing the ADF Open/Close Sensor ................................................................................................................................5- 23
5.4.10 Scanner HP Sensor.............................................................................................................................................5- 23
5.4.10.1 Before Removing the Scanner HP Sensor...........................................................................................................................5- 23
5.4.10.2 Removing the Mirror Base HP Sensor.................................................................................................................................5- 23
5.4.11 Original Size Sensor............................................................................................................................................5- 24
5.4.11.1 Before Removing the Original Size Sensor.......................................................................................................................... 5- 24
5.4.11.2 Removing the original size sensor ....................................................................................................................................... 5- 24
5.4.12 Cooling Fan .........................................................................................................................................................5- 25
5.4.12.1 Before Removing the Cooling Fan.......................................................................................................................................5- 25
5.4.12.2 Removing the Cooling Fan................................................................................................................................................... 5- 25
5.4.13 Scanner Drive Cable............................................................................................................................................5- 25
5.4.13.1 Outline.................................................................................................................................................................................. 5- 25
5.4.13.2 Before Removing the Scanner Drive Cable.........................................................................................................................5- 25
5.4.13.3 Removing the Scanner Drive Cable..................................................................................................................................... 5- 25
5.4.13.4 Fitting the Scanner Drive Cable ........................................................................................................................................... 5- 28
5.4.13.5 Adjusting the Position of the No. 1/No. 2 Mirror Base..........................................................................................................5- 28
5.4.14 Waste Toner Box Holder .....................................................................................................................................5- 29
5.4.14.1 Before Removing the Collecting Toner Bottle Holder .......................................................................................................... 5- 29
5.4.14.2 Removing the Collecting Toner Bottle Holder...................................................................................................................... 5- 29
Chapter 6 Laser Exposure
6.1 Construction ...............................................................................................................................................6- 1
6.1.1 Overview..................................................................................................................................................................6- 1
6.1.2 Major Components..................................................................................................................................................6- 1
6.2 Basic Sequence..........................................................................................................................................6- 2
6.2.1 Basic Sequence of Operation (laser exposure).......................................................................................................6- 2
6.3 Various Controls.........................................................................................................................................6- 2
6.3.1 Controlling the Laser Activation Timing...................................................................................................................6- 2

Contents
6.3.1.1 Generating the Sync Signal ..................................................................................................................................................... 6- 2
6.3.1.2 Flow of the Sync Signal ...........................................................................................................................................................6- 2
6.3.2 Controlling the Intensity of Laser Light.....................................................................................................................6- 2
6.3.2.1 Controlling the Laser Intensity .................................................................................................................................................6- 2
6.3.2.2 APC Control.............................................................................................................................................................................6- 3
6.3.3 Controlling the Laser Scanner Motor.......................................................................................................................6- 4
6.3.3.1 Controlling the Laser Scanner Motor.......................................................................................................................................6- 4
6.4 Parts Replacement Procedure ...................................................................................................................6- 5
6.4.1 Laser Scanner Unit..................................................................................................................................................6- 5
6.4.1.1 Removing the Laser Scanner Unit...........................................................................................................................................6- 5
6.4.1.2 When Replacing the Laser Scanner Unit................................................................................................................................. 6- 5
Chapter 7 Image Formation
7.1 Construction ...............................................................................................................................................7- 1
7.1.1 Overview..................................................................................................................................................................7- 1
7.1.2 Major Components...................................................................................................................................................7- 1
7.2 Image Formation Process ..........................................................................................................................7- 1
7.2.1 Overview..................................................................................................................................................................7- 1
7.3 Basic Sequence .........................................................................................................................................7- 2
7.3.1 At Power-On ............................................................................................................................................................7- 2
7.3.2 At Time of Printing ...................................................................................................................................................7- 3
7.4 Potential Control.........................................................................................................................................7- 3
7.4.1 Overview..................................................................................................................................................................7- 3
7.4.2 Copier/Printer Potential Control...............................................................................................................................7- 3
7.4.3 Determining the Primary Current.............................................................................................................................7- 6
7.4.4 Determining the Laser Output..................................................................................................................................7- 6
7.4.5 Determining the Developing Bias.............................................................................................................................7- 6
7.4.6 APC Correction........................................................................................................................................................7- 7
7.4.7 Adjusting the Density in Various Modes ..................................................................................................................7- 7
7.5 Charging Mechanism .................................................................................................................................7- 8
7.5.1 Controlling Pre-Exposure LED.................................................................................................................................7- 8
7.5.1.1 Pre-Exposure LED Control ......................................................................................................................................................7- 8
7.5.2 Primary Charging Mechanism..................................................................................................................................7- 9
7.5.2.1 Overview.................................................................................................................................................................................. 7- 9
7.5.2.2 Primary Charging Assembly Cleaning Mechanism.................................................................................................................. 7- 9
7.5.2.3 Others....................................................................................................................................................................................7- 10
7.5.3 Dust-Collecting Roller Bias....................................................................................................................................7- 10
7.5.3.1 Overview................................................................................................................................................................................ 7- 10
7.5.4 Pre-Transfer Charging Mechanism........................................................................................................................7- 11
7.5.4.1 Overview................................................................................................................................................................................ 7- 11
7.5.4.2 Controlling the Output to Suit the Environment (fuzzy control).............................................................................................. 7- 11
7.5.4.3 Pre-Transfer Charging Assembly Cleaning Mechanism........................................................................................................7- 12
7.5.4.4 Others....................................................................................................................................................................................7- 12
7.6 Drum Cleaner Unit....................................................................................................................................7- 12
7.6.1 Overview................................................................................................................................................................7- 12
7.6.2 Detecting the State (full) of the Collecting Toner Case..........................................................................................7- 13
7.6.3 Drum/Separation Claw Bias Control......................................................................................................................7- 14
7.7 Developing Assembly...............................................................................................................................7- 14
7.7.1 Controlling the Developing Assembly Drive...........................................................................................................7- 14
7.7.2 Controlling the Developing Bias.............................................................................................................................7- 14
7.7.3 Detecting the Toner Level and Controlling Toner Supply......................................................................................7- 15
7.8 Transfer Mechanism.................................................................................................................................7- 16
7.8.1 Transfer Charging Mechanism...............................................................................................................................7- 16
7.8.1.1 Overview................................................................................................................................................................................ 7- 16
7.8.1.2 Controlling the Output to Suit the Environment (fuzzy control).............................................................................................. 7- 16
7.8.1.3 Transfer Charging Assembly Cleaning Mechanism...............................................................................................................7- 17

Contents
7.8.1.4 Others....................................................................................................................................................................................7- 17
7.9 Separation Mechanism.............................................................................................................................7- 18
7.9.1 Separation Charging Mechanism..........................................................................................................................7- 18
7.9.1.1 Overview................................................................................................................................................................................7- 18
7.9.1.2 Correcting the Output to Suit the Environment and the Drum Surface Potential...................................................................7- 18
7.9.1.3 Others....................................................................................................................................................................................7- 19
7.10 Parts Replacement Procedure................................................................................................................7- 20
7.10.1 Process Unit ........................................................................................................................................................7- 20
7.10.1.1 Before Removing Process Unit............................................................................................................................................7- 20
7.10.1.2 Removing Process Unit .......................................................................................................................................................7- 20
7.10.1.3 Mounting Process Unit ........................................................................................................................................................7- 20
7.10.2 Pre-Exposure Lamp.............................................................................................................................................7- 21
7.10.2.1 Before Removing Pre-Exposure Lamp ...............................................................................................................................7- 21
7.10.2.2 Removing Pre-Exposure Lamp ...........................................................................................................................................7- 21
7.10.2.3 Cleaning Primary Toner Blocking Sheet .............................................................................................................................7- 21
7.10.3 Primary Charging Assembly................................................................................................................................7- 21
7.10.3.1 Before Removing Primary Charging Assembly....................................................................................................................7- 21
7.10.3.2 Removing Primary Charging Assembly .............................................................................................................................. 7- 21
7.10.4 Pre-Transfer Charging Assembly ........................................................................................................................7- 22
7.10.4.1 Before Removing Pre-Transfer Charging Assembly ...........................................................................................................7- 22
7.10.4.2 Removing Pre-Transfer Charging Assembly........................................................................................................................7- 22
7.10.5 Photosensitive Drum............................................................................................................................................7- 22
7.10.5.1 Points to Note When Handling Photosensitive Drum .......................................................................................................... 7- 22
7.10.5.2 Before Removing Photosensitive Drum...............................................................................................................................7- 22
7.10.5.3 Removing Photosensitive Drum ..........................................................................................................................................7- 22
7.10.5.4 Cleaning Photosensitive Drum ............................................................................................................................................7- 23
7.10.6 Drum Motor..........................................................................................................................................................7- 23
7.10.6.1 Before Removing Drum Motor ............................................................................................................................................7- 23
7.10.6.2 Removing Drum Motor ........................................................................................................................................................7- 23
7.10.7 Photosensitive Drum Heater................................................................................................................................7- 24
7.10.7.1 Points to Note When Handling Photosensitive Drum .......................................................................................................... 7- 24
7.10.7.2 Before Removing Photosensitive Drum Heater ..................................................................................................................7- 24
7.10.7.3 Removing Drum Heater ...................................................................................................................................................... 7- 24
7.10.7.4 Points to Note When Mounting Drum Heater ...................................................................................................................... 7- 24
7.10.8 Cleaning Blade ....................................................................................................................................................7- 24
7.10.8.1 Configuration........................................................................................................................................................................ 7- 24
7.10.8.2 Before Removing Cleaning Blade .......................................................................................................................................7- 24
7.10.8.3 Removing Cleaning Blade....................................................................................................................................................7- 24
7.10.8.4 Mounting Cleaning Blade ....................................................................................................................................................7- 25
7.10.9 Side Seal .............................................................................................................................................................7- 25
7.10.9.1 Before Removing Side Seal ................................................................................................................................................7- 25
7.10.9.2 Removing Side Seal ............................................................................................................................................................7- 26
7.10.10 Cleaner Scraper.................................................................................................................................................7- 26
7.10.10.1 Before Cleaning Cleaner Scraper .....................................................................................................................................7- 26
7.10.10.2 Cleaning Cleaner Scraper..................................................................................................................................................7- 26
7.10.11 Hopper Assembly...............................................................................................................................................7- 26
7.10.11.1 Before Removing Hopper Assembly ................................................................................................................................. 7- 26
7.10.11.2 Removing Hopper Assembly ............................................................................................................................................. 7- 26
7.10.12 Hopper Supply Motor.........................................................................................................................................7- 27
7.10.12.1 Before Removing Toner Supply Motor ..............................................................................................................................7- 27
7.10.12.2 Removing Toner Supply Motor ..........................................................................................................................................7- 27
7.10.13 Hopper Strring Motor .........................................................................................................................................7- 27
7.10.13.1 Before Removing Hopper Stirring Motor ........................................................................................................................... 7- 27
7.10.13.2 Removing Hopper Stirring Motor ....................................................................................................................................... 7- 27
7.10.14 Developing Assembly ........................................................................................................................................7- 28
7.10.14.1 Removing Developing Assembly ....................................................................................................................................... 7- 28
7.10.14.2 Cleaning Developing Toner Blocking Sheet ......................................................................................................................7- 28
7.10.15 Developing Cylinder...........................................................................................................................................7- 29
7.10.15.1 Before Removing Developing Cylinder .............................................................................................................................7- 29
7.10.15.2 Removing Developing Cylinder ......................................................................................................................................... 7- 29

Contents
7.10.16 Developing Blade...............................................................................................................................................7- 29
7.10.16.1 Before Removing Developing Blade .................................................................................................................................7- 29
7.10.16.2 Removing Developing Blade ............................................................................................................................................. 7- 29
7.10.16.3 Mounting Developing Blade ...............................................................................................................................................7- 29
7.10.17 Transfer/Separation Charging Assembly ...........................................................................................................7- 30
7.10.17.1 Removing Transfer/Separation Charging Assembly .........................................................................................................7- 30
7.10.17.2 Mounting Transfer/Separation Charging Assembly ...........................................................................................................7- 30
7.10.18 Separation Claw/Separation Claw Drive Assembly............................................................................................7- 30
7.10.18.1 Before Removing Separation Claw Holder ........................................................................................................................7- 30
7.10.18.2 Removing Separation Claw Holder ...................................................................................................................................7- 30
7.10.19 Potential Sensor Unit..........................................................................................................................................7- 31
7.10.19.1 Outline................................................................................................................................................................................7- 31
7.10.19.2 Before Removing Potential Sensor Unit ............................................................................................................................7- 31
7.10.19.3 Removing Potential Sensor Unit .......................................................................................................................................7- 31
7.10.20 Charging Wire ....................................................................................................................................................7- 31
7.10.20.1 Outline................................................................................................................................................................................7- 31
7.10.20.2 Routing Charging Wire ...................................................................................................................................................... 7- 31
7.10.20.3 Routing Grid for Primary Charging Assembly ...................................................................................................................7- 32
7.10.20.4 Adjusting Height of Charging Wire ....................................................................................................................................7- 32
Chapter 8 Pickup/Feeding System
8.1 Construction ...............................................................................................................................................8- 1
8.1.1 Specifications and construction...............................................................................................................................8- 1
8.1.2 Arrangement of Rollers and Sensors.......................................................................................................................8- 1
8.1.3 Outline of the Pickup Control System......................................................................................................................8- 3
8.1.4 Outline of the Pickup Assembly Motor Control System ...........................................................................................8- 5
8.2 Basic Sequence .........................................................................................................................................8- 6
8.2.1 Pickup from the Right Deck .....................................................................................................................................8- 6
8.2.2 Pickup from the Cassette 3......................................................................................................................................8- 7
8.2.3 Pickup Retry Operation............................................................................................................................................8- 8
8.3 Detecting Jams...........................................................................................................................................8- 8
8.3.1 Jam Detection Outline..............................................................................................................................................8- 8
8.3.1.1 Outline......................................................................................................................................................................................8- 8
8.3.1.2 Jam History............................................................................................................................................................................ 8- 10
8.3.2 Delay Jams............................................................................................................................................................8- 10
8.3.2.1 Cassette Pickup Assembly (right deck, left deck, cassette 3/4)............................................................................................. 8- 10
8.3.2.2 Other Delay Jam....................................................................................................................................................................8- 10
8.3.3 Stationary Jams.....................................................................................................................................................8- 11
8.3.3.1 Common Delay Jams.............................................................................................................................................................8- 11
8.3.3.2 Power-On Stationary Jam...................................................................................................................................................... 8- 12
8.4 Cassette Pick-Up Unit ..............................................................................................................................8- 12
8.4.1 Lifter Operation (cassette 3/4) ...............................................................................................................................8- 12
8.4.2 Detecting the Presence/Absence of Paper............................................................................................................8- 13
8.4.3 Outline of the Paper Level Detection Mechanism..................................................................................................8- 14
8.4.4 Paper Level Detection (cassette 3/4).....................................................................................................................8- 14
8.4.5 Identifying the Size of Paper (cassette 3/4)...........................................................................................................8- 14
8.4.6 Markings on the Width Guide Rail .........................................................................................................................8- 15
8.4.7 Paper Size .............................................................................................................................................................8- 15
8.5 Manual Feed Pickup Unit .........................................................................................................................8- 17
8.5.1 Pickup Operation ...................................................................................................................................................8- 17
8.5.2 Detecting the Size of Paper in the Manual Feed Tray...........................................................................................8- 18
8.6 Deck .........................................................................................................................................................8- 19
8.6.1 Lifter Operation (right/left deck) .............................................................................................................................8- 19
8.6.2 Lifter Limiter (right/left deck) Control Circuit...........................................................................................................8- 19
8.6.3 Detecting the Presence/Absence of Paper............................................................................................................8- 20
8.6.4 Outline of Paper Level Detection...........................................................................................................................8- 20

Contents
8.6.5 Paper Level Detection Operation (right/left deck)..................................................................................................8- 21
8.6.6 Identifying the Size of Paper (right/left deck).........................................................................................................8- 21
8.7 Registration Unit.......................................................................................................................................8- 21
8.7.1 Outline...................................................................................................................................................................8- 21
8.7.2 Control System......................................................................................................................................................8- 22
8.8 Duplex Feeding Unit.................................................................................................................................8- 22
8.8.1 Moving the Paper to the Reversing Assembly After Printing on the 1st Side........................................................8- 22
8.8.2 Moving the Paper to the Duplexing Feed Assembly From the Reversing Assembly ............................................8- 22
8.8.3 Outline...................................................................................................................................................................8- 23
8.8.4 Sequence of Printing Operation ............................................................................................................................8- 23
8.8.5 Outline of Through-Path Operation .......................................................................................................................8- 24
8.8.6 Through-Path Operation........................................................................................................................................8- 24
8.8.7 Outline of Horizontal Registration Position............................................................................................................8- 28
8.8.8 Horizontal Registration Position Detection Operation ...........................................................................................8- 28
8.9 Delivery.....................................................................................................................................................8- 29
8.9.1 Reversal Delivery Operation..................................................................................................................................8- 29
8.10 Cassette Heater......................................................................................................................................8- 30
8.10.1 Timing of the Cassette Heater Supplied with Power ...........................................................................................8- 30
8.11 Parts Replacement Procedure................................................................................................................8- 31
8.11.1 Pickup Roller........................................................................................................................................................8- 31
8.11.1.1 Before Removing the Pickup Roller ..................................................................................................................................... 8- 31
8.11.1.2 Removing the Pickup Roller................................................................................................................................................. 8- 31
8.11.1.3 Points to Note When Mounting the Pickup Roller ................................................................................................................8- 31
8.11.2 Cassette Pickup Assembly..................................................................................................................................8- 31
8.11.2.1 Removing the Cassette 3/4 Pickup Assembly .....................................................................................................................8- 31
8.11.3 Cassette Pickup Motor.........................................................................................................................................8- 31
8.11.3.1 Before Removing the Cassette 3/4 Pickup Motor................................................................................................................8- 31
8.11.3.2 Removing the Cassette 3/4 Pickup Motor............................................................................................................................8- 31
8.11.4 Cassette Lifter Motor ...........................................................................................................................................8- 32
8.11.4.1 Removing the Cassette 3 Lifter Motor M20.......................................................................................................................... 8- 32
8.11.4.2 Removing the Cassette 4 Lifter Motor M21.......................................................................................................................... 8- 32
8.11.4.3 Adjusting the Position of the Lifter Motor M20/M21 of the Cassette 3/4 ..............................................................................8- 33
8.11.5 Left Deck Lifter Motor ..........................................................................................................................................8- 33
8.11.5.1 Before Removing the Left Deck Lifter Motor........................................................................................................................8- 33
8.11.5.2 Removing the Left Deck Lifter Motor.................................................................................................................................... 8- 33
8.11.6 Right Deck Lifter Motor........................................................................................................................................8- 34
8.11.6.1 Before Removing the Right Deck Lifter Motor......................................................................................................................8- 34
8.11.6.2 Removing the Right Deck Lifter Motor ................................................................................................................................. 8- 34
8.11.7 Right Deck Pickup Assembly...............................................................................................................................8- 35
8.11.7.1 Removing the Right Deck Pickup Assembly........................................................................................................................8- 35
8.11.8 Left Deck Pickup Assembly.................................................................................................................................8- 35
8.11.8.1 Removing the Left Deck Pickup Assembly ..........................................................................................................................8- 35
8.11.9 Left Deck Pickup Motor........................................................................................................................................8- 36
8.11.9.1 Before Removing the Left Deck Pickup Motor..................................................................................................................... 8- 36
8.11.9.2 Removing the Left Deck Pickup Motor.................................................................................................................................8- 36
8.11.10 Right Deck Pickup Motor ...................................................................................................................................8- 36
8.11.10.1 Before Removing the Right Deck Pickup Motor.................................................................................................................8- 36
8.11.10.2 Removing the Right Deck Pickup Motor.............................................................................................................................8- 36
8.11.11 Left Deck Pickup Sensor....................................................................................................................................8- 36
8.11.11.1 Before Removing the Left Deck Feeding Sensor...............................................................................................................8- 36
8.11.11.2 Removing the Left Deck Feeding Sensor...........................................................................................................................8- 36
8.11.12 Left Deck Pickup Solenoid.................................................................................................................................8- 36
8.11.12.1 Before Removing the Left Deck Pickup Solenoid...............................................................................................................8- 36
8.11.12.2 Removing the Left Deck Pickup Solenoid..........................................................................................................................8- 37
8.11.12.3 Adjusting the Position of the Left Deck Pickup Solenoid....................................................................................................8- 37
8.11.13 Manual Feed Pull-Out Roller Unit......................................................................................................................8- 37
8.11.13.1 Removing the Manual Feeding Pickup Roller Unit.............................................................................................................8- 37
8.11.14 Manual Feed Pull-Out Roller..............................................................................................................................8- 37

Contents
8.11.14.1 Before Removing the Manual Feeding Pickup Roller.........................................................................................................8- 37
8.11.14.2 Removing the Manual Feeding Pickup Roller....................................................................................................................8- 37
8.11.15 Manual Feed Roller............................................................................................................................................8- 38
8.11.15.1 Before Removing the Manual Feeding Roller .................................................................................................................... 8- 38
8.11.15.2 Removing the Manual Feeding Roller................................................................................................................................8- 38
8.11.16 Manual Separation Roller...................................................................................................................................8- 38
8.11.16.1 Before Removing the Manual Separation Roller................................................................................................................ 8- 38
8.11.16.2 Removing the Manual Separation Roller............................................................................................................................8- 38
8.11.16.3 Adjusting the Pressure of the Manual Separation Roller.................................................................................................... 8- 38
8.11.17 Manual Feed Tray paper sensor........................................................................................................................8- 39
8.11.17.1 Removing the Manual Feeding Tray Sensor...................................................................................................................... 8- 39
8.11.18 Registration Roller..............................................................................................................................................8- 39
8.11.18.1 Before Removing the Registration Roller........................................................................................................................... 8- 39
8.11.18.2 Removing the Registration Roller....................................................................................................................................... 8- 39
8.11.19 Pre-Registration Roller.......................................................................................................................................8- 40
8.11.19.1 Before Removing the Registration Lower Roller ................................................................................................................ 8- 40
8.11.19.2 Removing the Registration Lower Roller............................................................................................................................ 8- 40
8.11.20 Pre-Registration Motor.......................................................................................................................................8- 41
8.11.20.1 Before Removing the Registration Front Motor..................................................................................................................8- 41
8.11.20.2 Removing the Registration Front Motor .............................................................................................................................8- 41
8.11.21 Registration Motor..............................................................................................................................................8- 41
8.11.21.1 Before Removing the Horizontal Registration Motor..........................................................................................................8- 41
8.11.21.2 Removing the Horizontal Registration Motor...................................................................................................................... 8- 41
8.11.22 Registration Sensor............................................................................................................................................8- 42
8.11.22.1 Before Removing the Horizontal Registration Sensor........................................................................................................8- 42
8.11.22.2 Removing the Horizontal Registration Sensor ...................................................................................................................8- 42
8.11.23 Registration Clutch.............................................................................................................................................8- 43
8.11.23.1 Before Removing the Registration Clutch ..........................................................................................................................8- 43
8.11.23.2 Removing the Registration Clutch...................................................................................................................................... 8- 43
8.11.24 Registration Brake Clutch...................................................................................................................................8- 43
8.11.24.1 Before Removing the Registration Brake...........................................................................................................................8- 43
8.11.24.2 Removing the Registration Brake....................................................................................................................................... 8- 43
8.11.25 Feeding Roller....................................................................................................................................................8- 43
8.11.25.1 Before Removing the Feeding Roller .................................................................................................................................8- 43
8.11.25.2 Removing the Feeding Roller.............................................................................................................................................8- 43
8.11.25.3 The Points to Mount the Feeding Roller.............................................................................................................................8- 44
8.11.26 Vertical Path Roller.............................................................................................................................................8- 44
8.11.26.1 Before Removing the Vertical Path Roller..........................................................................................................................8- 44
8.11.26.2 Removing the Vertical Path Roller .....................................................................................................................................8- 44
8.11.26.3 Removing the Vertical Path Roller 2/3 ............................................................................................................................... 8- 44
8.11.27 Vertical Path Motor.............................................................................................................................................8- 44
8.11.27.1 Before Removing the Vertical Path Upper Motor............................................................................................................... 8- 44
8.11.27.2 Removing the Vertical Path Upper Motor........................................................................................................................... 8- 45
8.11.28 Vertical Path Duplex Motor.................................................................................................................................8- 45
8.11.28.1 Before Removing the Vertical Path Duplex Motor.............................................................................................................. 8- 45
8.11.28.2 Removing the Vertical Path Duplex Motor .........................................................................................................................8- 45
8.11.29 Vertical Path Lower Motor..................................................................................................................................8- 45
8.11.29.1 Before Removing the Vertical Path Lower Motor............................................................................................................... 8- 45
8.11.29.2 Removing the Vertical Path Lower Motor...........................................................................................................................8- 45
8.11.30 Reversing Motor.................................................................................................................................................8- 45
8.11.30.1 Before Removing the Reversing Motor ..............................................................................................................................8- 45
8.11.30.2 Removing the Reversing Motor..........................................................................................................................................8- 46
8.11.30.3 Mounting the Reversing Motor ........................................................................................................................................... 8- 46
8.11.31 Fixing Feeding Unit Releasing Lever Sensor.....................................................................................................8- 46
8.11.31.1 Before Removing the Fixing Feeding Unit Release Lever Sensor.....................................................................................8- 46
8.11.31.2 Removing the Fixing Feeding Unit Release Lever Sensor................................................................................................. 8- 46
8.11.32 Reversing Sensor...............................................................................................................................................8- 46
8.11.32.1 Before Removing the Reversing Sensor 1.........................................................................................................................8- 46
8.11.32.2 Removing the Reversing Sensor 1.....................................................................................................................................8- 46
8.11.32.3 Before Removing the Reversing Sensor 2.........................................................................................................................8- 47

Contents
8.11.32.4 Removing the Reversing Sensor 2.....................................................................................................................................8- 47
8.11.33 Reversing Unit ...................................................................................................................................................8- 47
8.11.33.1 Before Removing the Reversing Flapper Solenoid ............................................................................................................ 8- 47
8.11.33.2 Removing the Reversing Flapper Solenoid........................................................................................................................ 8- 47
8.11.33.3 Mounting the Reversing Flapper Solenoid.........................................................................................................................8- 47
8.11.34 Feeding Belt.......................................................................................................................................................8- 48
8.11.34.1 Before Removing the feeding belt .....................................................................................................................................8- 48
8.11.34.2 Removing the feeding belt ................................................................................................................................................. 8- 48
8.11.35 Duplexing Unit....................................................................................................................................................8- 49
8.11.35.1 Before Removing the Duplex Feeding Unit........................................................................................................................8- 49
8.11.35.2 Removing the Duplex Feeding Unit....................................................................................................................................8- 49
8.11.36 Duplex Feed Motor ............................................................................................................................................8- 49
8.11.36.1 Before Removing the Duplex Feeding Left Motor ..............................................................................................................8- 49
8.11.36.2 Removing the Duplex Feeding Left Motor.......................................................................................................................... 8- 49
8.11.36.3 Before Removing the Duplex Feeding Right Motor............................................................................................................8- 49
8.11.36.4 Removing the Duplex Feeding Right Motor .......................................................................................................................8- 49
8.11.37 Duplex Feed Sensor..........................................................................................................................................8- 49
8.11.37.1 Before Removing the Duplex Pre-Registration Sensor......................................................................................................8- 49
8.11.37.2 Removing the Duplex Pre-Registration Sensor..................................................................................................................8- 49
8.11.38 Separation Roller...............................................................................................................................................8- 50
8.11.38.1 Before Removing the Separation Roller............................................................................................................................. 8- 50
8.11.38.2 Removing the Separation Roller ........................................................................................................................................ 8- 50
8.11.38.3 Points to Note When Mounting the Separation Roller........................................................................................................8- 50
8.11.38.4 Adjusting the Pressure of the Deck/Cassette Separation Roller........................................................................................8- 51
Chapter 9 Fixing System
9.1 Construction ...............................................................................................................................................9- 1
9.1.1 Specifications, Control Mechanisms, and Functions...............................................................................................9- 1
9.1.2 Major Components..................................................................................................................................................9- 1
9.1.3 IH Fixing Method (outline) .......................................................................................................................................9- 3
9.1.4 Limiting th Rise in Temperature at the Roller Edges by Use of a Flux blocking Plate (shutter) ..............................9- 3
9.2 Basic Sequence..........................................................................................................................................9- 4
9.2.1 Outline.....................................................................................................................................................................9- 4
9.2.2 30-Sec Start-Up Mode.............................................................................................................................................9- 4
9.2.3 Low-Temperature Environment Start-Up Mode.......................................................................................................9- 5
9.2.4 High-Humidity Environment Start-Up Mode ............................................................................................................9- 5
9.2.5 Recovery Mode .......................................................................................................................................................9- 6
9.2.6 Standby Mode .........................................................................................................................................................9- 6
9.2.7 Power Save Mode...................................................................................................................................................9- 7
9.2.8 Sleep Mode ............................................................................................................................................................9- 7
9.2.9 Copying/Printing Mode............................................................................................................................................9- 7
9.2.10 Down Sequence ....................................................................................................................................................9- 8
9.2.11 Enhanced Fixing Mode..........................................................................................................................................9- 8
9.2.12 Heavy Paper Mode................................................................................................................................................9- 9
9.2.13 Transparency Mode...............................................................................................................................................9- 9
9.2.14 Bond Paper Mode..................................................................................................................................................9- 9
9.3 Various Control Mechanisms....................................................................................................................9- 10
9.3.1 Fixing Drive System...............................................................................................................................................9- 10
9.3.1.1 Controlling the Drive of the Fixing Roller ...............................................................................................................................9- 10
9.3.1.2 Controlling the Drive of the Fixing Inlet Guide .......................................................................................................................9- 10
9.3.1.3 Controlling the Reciprocating Movement of the Thermistor...................................................................................................9- 11
9.3.1.4 Controlling the Reciprocating Mechanism of the Upper Separation Claw .............................................................................9- 11
9.3.1.5 Controlling the Drive of the Shutter........................................................................................................................................ 9- 12
9.3.1.6 Controlling the Shutter Position .............................................................................................................................................9- 13
9.3.2 Cleaning ................................................................................................................................................................9- 14
9.3.2.1 Controlling the Drive of the Cleaning Web.............................................................................................................................9- 14
9.3.2.2 Controlling the Mechanism Used to Detect the Remaining Length of the Cleaning Web...................................................... 9- 15

Contents
9.3.3 Detecting the Passage of Paper............................................................................................................................9- 16
9.3.3.1 Preventing Wrapping of Paper............................................................................................................................................... 9- 16
9.4 Protective Functions.................................................................................................................................9- 17
9.4.1 Detecting an Error Using the Thermistor ...............................................................................................................9- 17
9.4.2 Detecting an Error Using the Thermal Switch........................................................................................................9- 17
9.4.3 Errors.....................................................................................................................................................................9- 17
9.5 Parts Replacement Procedure .................................................................................................................9- 19
9.5.1 Fixing/Feeding Assembly.......................................................................................................................................9- 19
9.5.1.1 Before Removing the Fixing/Feeding unit.............................................................................................................................. 9- 19
9.5.1.2 Removing the Fixing/Feeding unit ......................................................................................................................................... 9- 19
9.5.2 Fixing Unit..............................................................................................................................................................9- 20
9.5.2.1 Before Removing the Fixing Upper Unit ................................................................................................................................9- 20
9.5.2.2 Removing the Fixing Upper Unit............................................................................................................................................9- 20
9.5.3 Pressure Roller......................................................................................................................................................9- 20
9.5.3.1 Before Removing the Pressure Roller ...................................................................................................................................9- 20
9.5.3.2 Removing the Pressure Roller...............................................................................................................................................9- 20
9.5.4 Upper Fixing Roller................................................................................................................................................9- 21
9.5.4.1 Before Removing the Fixing Roller ........................................................................................................................................ 9- 21
9.5.4.2 Removing the Fixing Roller.................................................................................................................................................... 9- 21
9.5.4.3 Points to Note When Mounting the Fixing Roller ...................................................................................................................9- 23
9.5.4.4 Applying Grease After Replacing the Fixing Roller................................................................................................................9- 24
9.5.4.5 Adjusting the Nip Width.......................................................................................................................................................... 9- 25
9.5.5 External Delivery Roller .........................................................................................................................................9- 25
9.5.5.1 Before Removing the External Delivery Roller....................................................................................................................... 9- 25
9.5.5.2 Removing the External Delivery Roller..................................................................................................................................9- 25
9.5.6 Internal Delivery Roller...........................................................................................................................................9- 26
9.5.6.1 Before Removing the Internal Delivery Roller........................................................................................................................9- 26
9.5.6.2 Removing the Internal Delivery Roller ................................................................................................................................... 9- 26
9.5.6.3 Points to Note When Mounting the Internal Delivery Roller...................................................................................................9- 27
9.5.7 Main Thermistor.....................................................................................................................................................9- 27
9.5.7.1 Before Removing the Main Thermistor/Shutter Thermistor ...................................................................................................9- 27
9.5.7.2 Removing the Main Thermistor/Shutter Thermistor...............................................................................................................9- 27
9.5.7.3 Points to Note When Mounting the Main Thermistor/Shutter Thermistor ..............................................................................9- 28
9.5.8 Sub Thermistor ......................................................................................................................................................9- 28
9.5.8.1 Before Removing the Sub Thermistor....................................................................................................................................9- 28
9.5.8.2 Removing the Sub Thermistor ............................................................................................................................................... 9- 29
9.5.8.3 Points to Note When Mounting the Sub Thermistor............................................................................................................... 9- 29
9.5.9 Thermal Switch......................................................................................................................................................9- 29
9.5.9.1 Before Removing the Thermal Switch ...................................................................................................................................9- 29
9.5.9.2 Removing the Thermal Switch...............................................................................................................................................9- 30
9.5.10 Fixing Heater........................................................................................................................................................9- 30
9.5.10.1 Before Removing the Fixing Heater Unit.............................................................................................................................. 9- 30
9.5.10.2 Removing the Fixing Heater Unit.........................................................................................................................................9- 30
9.5.11 Fixing Cleaning Belt.............................................................................................................................................9- 32
9.5.11.1 Before Removing the Fixing Web ........................................................................................................................................ 9- 32
9.5.11.2 Removing the Fixing Web....................................................................................................................................................9- 32
9.5.11.3 Cleaning the fixing oil dish and the fixing cleaning belt guide.............................................................................................. 9- 32
9.5.11.4 Mounting the Fixing Web ..................................................................................................................................................... 9- 32
9.5.11.5 After Replacing the Fixing Web............................................................................................................................................ 9- 33
9.5.12 Fixing Jam Sensor ...............................................................................................................................................9- 33
9.5.12.1 Before Removing the Delivery Jam Sensor.........................................................................................................................9- 33
9.5.12.2 Removing the Delivery Jam Sensor..................................................................................................................................... 9- 33
9.5.13 Claw Jam Sensor.................................................................................................................................................9- 33
9.5.13.1 Before Removing the Claw Jam Sensor..............................................................................................................................9- 33
9.5.13.2 Removing the Claw Jam Sensor.......................................................................................................................................... 9- 33
9.5.14 External Delivery Sensor......................................................................................................................................9- 34
9.5.14.1 Before Removing the External Delivery Sensor................................................................................................................... 9- 34
9.5.14.2 Removing the External Delivery Sensor .............................................................................................................................. 9- 34
9.5.15 Internal Delivery Sensor.......................................................................................................................................9- 34

Contents
9.5.15.1 Before Removing the Internal Delivery Sensor.................................................................................................................... 9- 34
9.5.15.2 Removing the Internal Delivery Sensor................................................................................................................................ 9- 34
9.5.16 Fixing Inlet Sensor...............................................................................................................................................9- 34
9.5.16.1 Before Removing the Fixing Inlet Sensor............................................................................................................................. 9- 34
9.5.16.2 Removing the Fixing Inlet Sensor........................................................................................................................................9- 34
9.5.16.3 Adjusting the Fixing Inlet Guide ...........................................................................................................................................9- 35
9.5.17 Fixing web sensor................................................................................................................................................9- 35
9.5.17.1 Before Removing the Fixing Web Sensor............................................................................................................................9- 35
9.5.17.2 Removing the Fixing Web Sensor........................................................................................................................................9- 35
9.5.18 Fixing shutter sensor ...........................................................................................................................................9- 35
9.5.18.1 Before Removing the Shutter Sensor ..................................................................................................................................9- 35
9.5.18.2 Removing the Shutter Sensor.............................................................................................................................................. 9- 35
9.5.19 Fixing shutter motor.............................................................................................................................................9- 35
9.5.19.1 Before Removing the Shutter Motor..................................................................................................................................... 9- 35
9.5.19.2 Removing the Shutter Motor ................................................................................................................................................ 9- 35
9.5.20 Fixing Inlet Guide Solenoid..................................................................................................................................9- 36
9.5.20.1 Before Removing the Fixing Inlet Guide Solenoid (SL1)......................................................................................................9- 36
9.5.20.2 Removing the Fixing Inlet Guide Solenoid (SL1).................................................................................................................9- 36
9.5.20.3 Adjusting the Fixing Inlet Guide Solenoid (SL1)................................................................................................................... 9- 36
9.5.21 Delivery Flapper Solenoid....................................................................................................................................9- 36
9.5.21.1 Before Removing the Delivery Flapper Solenoid (SL5) ....................................................................................................... 9- 36
9.5.21.2 Removing the Delivery Flapper Solenoid (SL5)...................................................................................................................9- 36
9.5.21.3 Points to Note When Mounting the Delivery Flapper Solenoid (SL5) .................................................................................. 9- 37
9.5.22 Fixing Cleaning Web Solenoid.............................................................................................................................9- 37
9.5.22.1 Before Removing the Fixing Web Solenoid (SL9)................................................................................................................9- 37
9.5.22.2 Removing the Fixing Web Solenoid (SL9)...........................................................................................................................9- 37
9.5.22.3 Adjusting the Fixing Web Solenoid (SL9)............................................................................................................................. 9- 37
9.5.23 Upper Separation Claw........................................................................................................................................9- 37
9.5.23.1 Removing the Upper Separation Claw.................................................................................................................................9- 37
9.5.23.2 Points to Note When Mounting the Upper Separation Claw................................................................................................9- 38
9.5.24 Lower Separation Claw........................................................................................................................................9- 38
9.5.24.1 Before Removing the Lower Separation Claw (Unit) ...........................................................................................................9- 38
9.5.24.2 Removing the Lower Separation Claw (Unit)....................................................................................................................... 9- 39
Chapter 10 External and Controls
10.1 Control Panel..........................................................................................................................................10- 1
10.1.1 Overview..............................................................................................................................................................10- 1
10.1.2 LCD Indication Processing ..................................................................................................................................10- 1
10.1.3 Adjusting the LCD Contrast.................................................................................................................................10- 1
10.1.4 Functions of the Control Panel CPU....................................................................................................................10- 1
10.2 Counters .................................................................................................................................................10- 1
10.2.1 Soft Counters.......................................................................................................................................................10- 1
10.3 Fans........................................................................................................................................................10- 3
10.3.1 Arrangement, Functions, and Error Codes..........................................................................................................10- 3
10.3.2 Controlling the Speed of the Fans.......................................................................................................................10- 4
10.3.3 Sequence of Operation........................................................................................................................................10- 4
10.4 Power Supply System.............................................................................................................................10- 5
10.4.1 Power Supply.......................................................................................................................................................10- 5
10.4.1.1 Overview .............................................................................................................................................................................. 10- 5
10.4.1.2 Distribution of Power and the Switches................................................................................................................................10- 5
10.4.2 Rated Output of the DC Power Supply PCB........................................................................................................10- 7
10.4.2.1 Rated Output of the DC Power Supply PCB........................................................................................................................10- 7
10.4.2.2 Rated Output of the Accessories Power Supply PCB..........................................................................................................10- 7
10.4.3 Protection Function..............................................................................................................................................10- 8
10.4.3.1 Protective Functions............................................................................................................................................................. 10- 8
10.4.4 Backup Battery ....................................................................................................................................................10- 8
10.4.4.1 Backup Battery.....................................................................................................................................................................10- 8
10.4.5 Energy-Saving Function ......................................................................................................................................10- 8

Contents
10.4.5.1 Overview .............................................................................................................................................................................. 10- 8
10.4.5.2 SNMP setup......................................................................................................................................................................... 10- 9
10.5 Parts Replacement Procedure .............................................................................................................10- 12
10.5.1 External Covers..................................................................................................................................................10- 12
10.5.1.1 Right Cover (Lower Rear) .................................................................................................................................................. 10- 12
10.5.1.2 Right Cover (Upper Rear) .................................................................................................................................................. 10- 12
10.5.1.3 Right Cover (Upper)........................................................................................................................................................... 10- 12
10.5.1.4 Left Cover (Upper) .............................................................................................................................................................10- 12
10.5.1.5 Front Cover ........................................................................................................................................................................ 10- 13
10.5.1.6 Rear Cover (Upper)............................................................................................................................................................10- 13
10.5.1.7 Rear Cover (Lower)............................................................................................................................................................10- 13
10.5.1.8 Left Cover (Lower) .............................................................................................................................................................10- 13
10.5.1.9 Left Cover (Middle).............................................................................................................................................................10- 14
10.5.1.10 Toner Supply Cover ......................................................................................................................................................... 10- 14
10.5.1.11 Fixing/Feeding Unit Cover................................................................................................................................................ 10- 14
10.5.1.12 Fixing Cover (Upper)........................................................................................................................................................10- 15
10.5.1.13 Fixing Cover (Lower)........................................................................................................................................................10- 16
10.5.1.14 Main Controller Box Cover ............................................................................................................................................... 10- 17
10.5.1.15 Reader Left Cover............................................................................................................................................................10- 17
10.5.1.16 Reader Right Cover.......................................................................................................................................................... 10- 17
10.5.1.17 Reader Front Cover.......................................................................................................................................................... 10- 17
10.5.1.18 Reader Rear Cover..........................................................................................................................................................10- 18
10.5.2 Left Deck Drive Assembly..................................................................................................................................10- 19
10.5.2.1 Before Removing the Left Deck Drive Assembly ...............................................................................................................10- 19
10.5.2.2 Removing the Left Deck Drive Assembly...........................................................................................................................10- 19
10.5.3 Manual Feed Pickup Drive Assembly ................................................................................................................10- 19
10.5.3.1 Before Removing the Manual Pickup Drive Assembly.......................................................................................................10- 19
10.5.3.2 Removing the Manual Pickup Drive Assembly ..................................................................................................................10- 19
10.5.4 Vertical Path Drive Assembly.............................................................................................................................10- 19
10.5.4.1 Before Removing the Vertical Path Drive Assembly.......................................................................................................... 10- 19
10.5.4.2 Removing the Vertical Path Drive Assembly......................................................................................................................10- 19
10.5.5 Waste Toner Drive Assembly.............................................................................................................................10- 20
10.5.5.1 Before Removing the Collecting Toner Drive Assembly.................................................................................................... 10- 20
10.5.5.2 Removing the Collecting Toner Drive Assembly................................................................................................................ 10- 20
10.5.6 Main Drive Assembly .........................................................................................................................................10- 21
10.5.6.1 Fitting the Drive Belt...........................................................................................................................................................10- 21
10.5.7 Cassette Pickup Drive Assembly.......................................................................................................................10- 21
10.5.7.1 Before Removing the Cassette Pickup Drive Assembly ....................................................................................................10- 21
10.5.7.2 Removing the Cassette Pickup Drive Assembly................................................................................................................ 10- 21
10.5.8 Fixing Drive Assembly........................................................................................................................................10- 22
10.5.8.1 Before Removing the Fixing Drive Assembly.....................................................................................................................10- 22
10.5.8.2 Removing the Fixing Drive Assembly ................................................................................................................................ 10- 22
10.5.9 Power Supply Unit..............................................................................................................................................10- 22
10.5.9.1 Removing the Charger unit ................................................................................................................................................ 10- 22
10.5.9.2 Points to Note At Occurrence of Charger unit Malfunction ................................................................................................10- 22
10.5.10 Duplex Unit PCB ..............................................................................................................................................10- 23
10.5.10.1 Before Removing the Duplex unit PCB ............................................................................................................................10- 23
10.5.10.2 Removing the Duplex Unit PCB.......................................................................................................................................10- 23
10.5.11 Control Panel....................................................................................................................................................10- 23
10.5.11.1 Before Removing Control Panel ...................................................................................................................................... 10- 23
10.5.11.2 Removing Control Panel ................................................................................................................................................. 10- 23
10.5.12 DC Controller PCB...........................................................................................................................................10- 24
10.5.12.1 Before Removing DC Controller PCB .............................................................................................................................10- 24
10.5.12.2 Removing DC Controller PCB .........................................................................................................................................10- 24
10.5.12.3 When Replacing DC Controller PCB ...............................................................................................................................10- 24
10.5.13 Printer Power Supply PCB...............................................................................................................................10- 24
10.5.13.1 Before Removing Printer Power Supply PCB ................................................................................................................. 10- 24
10.5.13.2 Removing Printer Power Supply PCB ............................................................................................................................. 10- 24
10.5.14 Option Power Supply PCB...............................................................................................................................10- 25
10.5.14.1 Before Removing Accessories Power Supply PCB .........................................................................................................10- 25