Canon iR C6800 Series Service Manual page 259

Contents
7.1 Construction ....................................................................................................................................................... 7 1
7.1.1 Specifications of the Image Formation System........................................................................................... 7 1
7.1.2 Major Components ...................................................................................................................................... 7 4
7.1.3 Charging System ......................................................................................................................................... 7 5
7.2 Image Formation Process ................................................................................................................................... 7 7
7.2.1 Image Formation Process ............................................................................................................................ 7 7
7.3 Basic Sequence................................................................................................................................................... 7 9
7.3.1 At Time of Power On.................................................................................................................................. 7 9
7.3.2 During Copying/Printing (normal speed).................................................................................................. 7 10
7.3.3 During Copying/Printing (2/3 speed, 1/3 speed)....................................................................................... 7 10
7.4 Image Stabilization Control.............................................................................................................................. 7 11
7.4.1 Overview of Image Stabilization Control ................................................................................................. 7 11
7.4.2 Timing of Image Stabilization Control ..................................................................................................... 7 12
7.4.3 Potential Control........................................................................................................................................ 7 15
7.4.4 ATVC Control ........................................................................................................................................... 7 19
7.4.5 ATR Control.............................................................................................................................................. 7 21
7.4.6 ACR Control (Auto Carrier Refresh Control) ........................................................................................... 7 24
7.4.7 D max Control........................................................................................................................................... 7 25
7.4.8 D half Control ........................................................................................................................................... 7 26
7.4.9 PASCAL control ...................................................................................................................................... 7 29
7.5 Charging Meachanism...................................................................................................................................... 7 32
7.5.1 Controlling the Primary Charging Bias..................................................................................................... 7 32
7.5.2 Controlling the Primary Charging Assembly Cleaning Mechanism......................................................... 7 33
7.5.3 Controlling the Pre Transfer Charging Bias ............................................................................................. 7 34
7.5.4 Controlling the Pre Transfer Charging Assembly Cleaning Mechanism ................................................. 7 34
7.5.5 Pre Exposure LED .................................................................................................................................... 7 36
7.6 Developing Rotary ........................................................................................................................................... 7 37
7.6.1 Overview of the Developing Rotary ......................................................................................................... 7 37
7.6.2 Controlling the Developing Rotary ........................................................................................................... 7 38
7.7 Developing Unit ............................................................................................................................................... 7 41
7.7.1 Construction of the Color Developing Assembly ..................................................................................... 7 41
7.7.2 Controlling the Color Developing Assembly Drive Mechanism .............................................................. 7 42
7.7.3 Controlling the Color Developing Bias..................................................................................................... 7 43
7.7.4 Color Toner Supply ................................................................................................................................... 7 44
7.7.5 Detecting the Level of Color Toner .......................................................................................................... 7 45
7.7.6 Construction of the Black Developing Assembly ..................................................................................... 7 48
7.7.7 Controlling the Black Developing Assembly Drive Mechanism .............................................................. 7 49
7.7.8 Black Toner Supply................................................................................................................................... 7 50
7.7.9 Controlling the Black Developing Bias..................................................................................................... 7 52
7.8 Transfer Device ................................................................................................................................................ 7 53
7.8.1 Overview of the Transfer Assembly ......................................................................................................... 7 53
7.8.2 Controlling the Transfer Bias .................................................................................................................... 7 54
7.8.3 Overview of the Primary Transfer Assembly............................................................................................ 7 56
7.8.4 Controlling the ITB Cleaner Shifting Mechanism .................................................................................... 7 57
7.8.5 Checking the ITB Cleaner Position........................................................................................................... 7 58
7.8.6 Overview of the Secondary Transfer Assembly........................................................................................ 7 59
7.8.7 Controlling the Movement of the Secondary Transfer Roller................................................................... 7 60
7.8.8 Checking the Location of the Secondary Transfer Roller ......................................................................... 7 61
7.8.9 Detecting the ITB Home Position ............................................................................................................. 7 62
7.8.10 Separation ................................................................................................................................................ 7 64
Contents