Canon MF8100 Series, Service Manual, Page: 8 / 296

Contents
2.3.2 Driving and Controlling the High-Voltage System..................................................................................................2- 14
2.3.2.1 Outline.................................................................................................................................................................................... 2- 14
2.3.2.2 Primary Charging Bias Generation ........................................................................................................................................ 2- 14
2.3.2.3 Developing Bias Generation .................................................................................................................................................. 2- 14
2.3.2.4 Primary Transfer Bias Generation ......................................................................................................................................... 2- 14
2.3.2.5 Secondary Transfer Bias Generation..................................................................................................................................... 2- 15
2.3.2.6 Auxiliary ITB Cleaning Bias Generation................................................................................................................................. 2- 15
2.3.2.7 ITB Cleaning Bias Generation ............................................................................................................................................... 2- 15
2.3.2.8 Fixing Bias Generation........................................................................................................................................................... 2- 15
2.3.3 Image Stabilizaton Control.....................................................................................................................................2- 15
2.3.3.1 Outline.................................................................................................................................................................................... 2- 15
2.3.3.2 Image Density Calibration (D-max) Control ........................................................................................................................... 2- 16
2.3.3.3 Image Halftone Calibration (D-half) Control........................................................................................................................... 2- 16
2.3.4 Developing Rotary .................................................................................................................................................2- 16
2.3.4.1
Outline.................................................................................................................................................................................... 2- 16
2.3.4.2 Developing Rotary Rotation Control ...................................................................................................................................... 2- 16
2.3.4.3 Developing Rotary Engaging Control..................................................................................................................................... 2- 17
2.3.4.4 Developing Rotary Position Detection ................................................................................................................................... 2- 18
2.3.5 Toner Cartridge......................................................................................................................................................2- 19
2.3.5.1 Outline.................................................................................................................................................................................... 2- 19
2.3.5.2 Memory Tag........................................................................................................................................................................... 2- 19
2.3.5.3 Memory Tag Contact Engaging Control................................................................................................................................. 2- 19
2.3.5.4 Cartridge Presence Detection................................................................................................................................................ 2- 20
2.3.5.5
Toner Cartridge Life Detection............................................................................................................................................... 2- 20
2.3.6 Drum Cartridge ......................................................................................................................................................2- 21
2.3.6.1 Outline.................................................................................................................................................................................... 2- 21
2.3.6.2 Cleaning Roller Engaging Control.......................................................................................................................................... 2- 22
2.3.6.3 Memory Tag........................................................................................................................................................................... 2- 23
2.3.6.4 Detecting the ITB Home Position........................................................................................................................................... 2- 24
2.3.6.5 Drum Cartridge Presence Detection ...................................................................................................................................... 2- 25
2.3.6.6
Checking the Life of the Drum Cartridge................................................................................................................................ 2- 26
2.3.7 Secondary Transfer Mechanism ............................................................................................................................2- 27
2.3.7.1 Outline.................................................................................................................................................................................... 2- 27
2.3.7.2 Secondary Transfer Roller Engaging Control ........................................................................................................................ 2- 28
2.3.7.3
Secondary Roller Position Detection ..................................................................................................................................... 2- 29
2.4 Pickup and Feed System ......................................................................................................................... 2- 30
2.4.1 Overview/Configuration..........................................................................................................................................2- 30
2.4.1.1 Overview ................................................................................................................................................................................ 2- 30
2.4.1.2 Pickup/Feeding Assembly...................................................................................................................................................... 2- 31
2.4.2 Other Control .........................................................................................................................................................2- 32
2.4.2.1
Skew Correction Function...................................................................................................................................................... 2- 32
2.4.2.2 Feed Speed Control............................................................................................................................................................... 2- 32
2.4.2.3 Detecting the Machine Inside Temperature ........................................................................................................................... 2- 32
2.4.3 Detection Jams ......................................................................................................................................................2- 33
2.4.3.1 Jam Detection Outline............................................................................................................................................................ 2- 33
2.4.3.2 Delay Jams ............................................................................................................................................................................ 2- 33
2.4.3.3 Stationary Jams ..................................................................................................................................................................... 2- 33
2.4.3.4 Other Jams ............................................................................................................................................................................ 2- 33
2.4.4 Cassette Pickup Unit..............................................................................................................................................2- 34
2.4.4.1 Pickup from the Cassette....................................................................................................................................................... 2- 34
2.4.5 Manual Feed Pickup Unit.......................................................................................................................................2- 34
2.4.5.1 Multi-purpose Tray Pick-up .................................................................................................................................................... 2- 34
2.5 Fixing Unit ................................................................................................................................................ 2- 34
2.5.1 Overview/Configuration..........................................................................................................................................2- 34
2.5.1.1 Outline.................................................................................................................................................................................... 2- 34
2.5.2 Various Control Mechanisms .................................................................................................................................2- 35
2.5.2.1
Controlling the Temperature of the Fixing Unit ...................................................................................................................... 2- 35
2.5.3 Protection Function ................................................................................................................................................2- 35
2.5.3.1 Flicker prevention function ..................................................................................................................................................... 2- 35
2.5.3.2 Protective Function ................................................................................................................................................................ 2- 35