Canon MF8100 Series Service Manual page 35

Contents
2.1 Document Feed and Exposure System...........................................................................................................................2-1
2.1.1 Overview/Configuration .............................................................................................................................................................. 2-1
2.1.1.1 Overview .........................................................................................................................................................................................................2-1
2.1.1.2 Major Components..........................................................................................................................................................................................2-1
2.1.2 Basic Sequence ............................................................................................................................................................................ 2-2
2.1.2.1 Basic Sequence of Operation at Power-on......................................................................................................................................................2-2
2.1.2.2 Basic Sequence of Operation in Response to a Press on the Start Key (book)...............................................................................................2-3
2.2 Laser Exposure...............................................................................................................................................................2-4
2.2.1 Overview/Configuration .............................................................................................................................................................. 2-4
2.2.1.1 Outline.............................................................................................................................................................................................................2-4
2.2.2 Controlling the Laser ................................................................................................................................................................... 2-5
2.2.2.1 Outline.............................................................................................................................................................................................................2-5
2.2.2.2 Laser Emission Control...................................................................................................................................................................................2-6
2.2.2.3 Automatic Power Control (APC) ....................................................................................................................................................................2-6
2.2.2.4 Horizontal Synchronous Control.....................................................................................................................................................................2-6
2.2.2.5 Image Mask Control........................................................................................................................................................................................2-6
2.2.2.6 Laser Failure Detection ...................................................................................................................................................................................2-6
2.2.3 Controlling the Laser Scanner Motor .......................................................................................................................................... 2-7
2.2.3.1 Outline.............................................................................................................................................................................................................2-7
2.2.3.2 Scanner Motor Speed Control.........................................................................................................................................................................2-7
2.2.3.3 Scanner Motor Failure Detection ....................................................................................................................................................................2-7
2.3 Image Formation ............................................................................................................................................................2-7
2.3.1 Overview/Configuration .............................................................................................................................................................. 2-7
2.3.1.1 Outline.............................................................................................................................................................................................................2-7
2.3.1.2 Image Formation Process................................................................................................................................................................................2-8
2.3.1.3 Electrostatic Latent Image Formation Block ..................................................................................................................................................2-9
2.3.1.4 Developing Block............................................................................................................................................................................................2-9
2.3.1.5 Transfer Block...............................................................................................................................................................................................2-10
2.3.1.6 Fixing Block..................................................................................................................................................................................................2-11
2.3.1.7 ITB Cleaning Block ......................................................................................................................................................................................2-12
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
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