Canon iR2422 series Service Manual page 10

Contents
Chapter 5 Laser Exposure
5.1 Construction ............................................................................................................................................... 5- 1
5.1.1 Overview ..................................................................................................................................................................5- 1
5.1.2 Specifications and Control Mechanism....................................................................................................................5- 1
5.1.3 Main Components....................................................................................................................................................5- 2
5.1.4 Control System Configuration ..................................................................................................................................5- 3
5.2 Various Controls ......................................................................................................................................... 5- 4
5.2.1 Controlling the Laser Activation Timing ...................................................................................................................5- 4
5.2.1.1 Laser Emission ON/OFF Control ............................................................................................................................................. 5- 4
5.2.1.2 Horizontal Synchronization Control.......................................................................................................................................... 5- 4
5.2.2 Controlling the Intensity of Laser Light.....................................................................................................................5- 4
5.2.2.1 Automatic Photocurrent Control (APC) .................................................................................................................................... 5- 4
5.2.3 Controlling the Laser Scanner Motor .......................................................................................................................5- 5
5.2.3.1 Laser Scanner Motor Control................................................................................................................................................... 5- 5
5.2.4 Controlling the Laser Shutter ...................................................................................................................................5- 6
5.2.4.1 Laser Shutter Control............................................................................................................................................................... 5- 6
5.3 Parts Replacement Procedure ................................................................................................................... 5- 7
5.3.1 Laser Scanner Unit ..................................................................................................................................................5- 7
5.3.1.1 Removing the Laser Scanner Unit ........................................................................................................................................... 5- 7
Chapter 6 Image Formation
6.1 Construction ............................................................................................................................................... 6- 1
6.1.1 Specifications of Image Formation System..............................................................................................................6- 1
6.1.2 Major Components of Image Formation System .....................................................................................................6- 2
6.2 Image Formation Process .......................................................................................................................... 6- 3
6.2.1 Image Formation Process........................................................................................................................................6- 3
6.3 Basic Sequence ......................................................................................................................................... 6- 4
6.3.1 Basic Sequence of Operation ..................................................................................................................................6- 4
6.4 Driving and Controlling the High-Voltage System ...................................................................................... 6- 5
6.4.1 Outline......................................................................................................................................................................6- 5
6.5 Drum Unit ................................................................................................................................................... 6- 6
6.5.1 Outline of the Drum Unit ..........................................................................................................................................6- 6
6.5.1.1 Outline...................................................................................................................................................................................... 6- 6
6.5.2 Charging Mechanism ...............................................................................................................................................6- 6
6.5.2.1 Primary Charging Bias Control ................................................................................................................................................ 6- 6
6.6 Developing Unit .......................................................................................................................................... 6- 7
6.6.1 Outline......................................................................................................................................................................6- 7
6.6.2 Developing Bias Control ..........................................................................................................................................6- 7
6.7 Toner Container ......................................................................................................................................... 6- 8
6.7.1 Outline......................................................................................................................................................................6- 8
6.8 Transfer Unit............................................................................................................................................... 6- 8
6.8.1 Outline of the Transfer Unit......................................................................................................................................6- 8
6.8.1.1 Outline...................................................................................................................................................................................... 6- 8
6.8.2 Controlling the Transfer Bias ...................................................................................................................................6- 9
6.8.2.1 Transfer Roller Bias Control..................................................................................................................................................... 6- 9
6.8.3 Separation Mechanism ............................................................................................................................................6- 9
6.8.3.1 Static Eliminator Bias Control .................................................................................................................................................. 6- 9
6.9 Photosensitive Drum Cleaning ................................................................................................................. 6- 10
6.9.1 Outline....................................................................................................................................................................6- 10
6.9.2 Waste Toner Full Detection ...................................................................................................................................6- 10
6.10 Parts Replacement Procedure ............................................................................................................... 6- 11
6.10.1 Drum Unit .............................................................................................................................................................6- 11
6.10.1.1 Removing the Drum Unit...................................................................................................................................................... 6- 11
6.10.2 Developing Assembly...........................................................................................................................................6- 11
6.10.2.1 Removing the Developing Assembly ................................................................................................................................... 6- 11