Canon Color iR C3480, Service Manual

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Contents
Chapter 6 Laser Exposure
6.1 Construction .....................................................................................................................................................6- 1
6.1.1 Specifications, Control Mechanisms, and Functions ..........................................................................6- 1
6.1.2 Overview ....................................................................................................................................................6- 1
6.2 Various Control ................................................................................................................................................6- 3
6.2.1 Controlling the Laser Activation Timing .................................................................................................6- 3
6.2.1.1 Turning On and Off the Laser Light ................................................................................................6- 3
6.2.1.2 Controlling Synchronization in Main Scanning Direction ............................................................6- 4
6.2.1.3 Controlling Synchronization in Sub Scanning Direction ..............................................................6- 5
6.2.1.4 BD Correction .....................................................................................................................................6- 7
6.2.2 Controlling the Intensity of Laser Light ..................................................................................................6- 9
6.2.2.1 APC Control .......................................................................................................................................6- 9
6.2.3 Controlling the Laser Scanner Motor ...................................................................................................6- 10
6.2.3.1 Controlling the Speed of the Laser Scanner Motor ....................................................................6- 10
6.3 Parts Replacement Procedure ....................................................................................................................6- 12
6.3.1 Laser Scanner Unit .................................................................................................................................6- 12
6.3.1.1 Before Removing the Laser Scanner Unit ...................................................................................6- 12
6.3.1.2 Removing the Laser Scanner Unit ................................................................................................6- 12
6.3.1.3 After Replacing the Laser Scanner Unit ......................................................................................6- 13
Chapter 7 Image Formation
7.1
Construction
.....................................................................................................................................................7- 1
7.1.1
Specifications, Control Mechanisms, and Functions
..........................................................................7- 1
7.1.2
Overview
....................................................................................................................................................7- 2
7.1.3
Printing Process
........................................................................................................................................7- 3
7.1.4
Static Image Formation Block
................................................................................................................7- 4
7.1.5
Developing Block
......................................................................................................................................7- 6
7.1.6
Transfer Block
...........................................................................................................................................7- 7
7.1.7
Fixing Block
...............................................................................................................................................7- 8
7.1.8
ITB Cleaning Block
...................................................................................................................................7- 9
7.1.9
Photosensitive Drum Cleaning Block
....................................................................................................7- 9
7.2
Driving and Controlling the High-Voltage System
....................................................................................7- 10
7.2.1
Overview
..................................................................................................................................................7- 10
7.2.2
Generation of the Primary Charging Bias
...........................................................................................7- 11
7.2.3
Generation of the Developing Bias
......................................................................................................7- 11
7.2.4
Generation of the Primary Transfer Bias
............................................................................................7- 12
7.2.5
Generation of the Secondary Transfer Bias
.......................................................................................7- 12
7.3
Image Stabilization Control
..........................................................................................................................7- 12
7.3.1
Overview of Image Stabilization
...........................................................................................................7- 12
7.3.2
Timing of Image Stabilization Control
.................................................................................................7- 13
7.3.3
Drum Film Thickness Detection
...........................................................................................................7- 14
7.3.4 ATR Control .............................................................................................................................................7- 15
7.3.5
D-max Control
.........................................................................................................................................7- 16
7.3.6
PASCAL Control
.....................................................................................................................................7- 19
7.3.7
D-half Control
..........................................................................................................................................7- 20
7.3.8 ARCDAT Control ....................................................................................................................................7- 23
7.3.9 Color Displacement Correction Control ..............................................................................................7- 25