Canon iR C6800 Series Service Manual page 11

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
7.9 Photosensitive Drum Cleaning ......................................................................................................................... 7 65
7.9.1 Overview of the Drum Cleaning Unit ....................................................................................................... 7 65
7.9.2 Controlling the Drum Cleaning Unit Drive Mechanism ........................................................................... 7 66
7.10 Waste Toner Collection Mechanism .............................................................................................................. 7 67
7.10.1 Collection of Waste Toner ...................................................................................................................... 7 67
7.10.2 Detecting the State of the Waste Toner Bottle (full)............................................................................... 7 68
7.11 Parts Replacement Procedure ......................................................................................................................... 7 71
7.11.1 Process Unit ............................................................................................................................................. 7 71
7.11.2 Pre exposure LED Array ......................................................................................................................... 7 78
7.11.3 Primary Charging Assembly.................................................................................................................... 7 84
7.11.4 Primary Charging Assembly Cleaning Motor ......................................................................................... 7 86
7.11.5 Pre transfer Charging Assembly.............................................................................................................. 7 89
7.11.6 Pre transfer Charging Assembly Cleaning Motor ................................................................................... 7 90
7.11.7 Photosensitive Drum Cleaning Unit ........................................................................................................ 7 90
7.11.8 Photosensitive Drum ................................................................................................................................ 7 96
7.11.9 Drum Motor ........................................................................................................................................... 7 108
7.11.10 Drum Heater......................................................................................................................................... 7 111
7.11.11 Drum Heater PCB ................................................................................................................................ 7 123
7.11.12 Photosensitive Drum Cleaning Blade .................................................................................................. 7 136
7.11.13 Photosensitive Drum Cleaner Edge Scraper ........................................................................................ 7 143
7.11.14 Hopper Assembly................................................................................................................................. 7 149
7.11.15 Hopper Supply Motor .......................................................................................................................... 7 151
7.11.16 Hopper Strring Motor .......................................................................................................................... 7 154
7.11.17 Color Developing Assembly................................................................................................................ 7 157
7.11.18 Black Developing Assembly................................................................................................................ 7 169
7.11.19 Black Developing Cylinder.................................................................................................................. 7 177
7.11.20 Black Developing Clutch ..................................................................................................................... 7 186
7.11.21 Color Toner Supply Clutch .................................................................................................................. 7 189
7.11.22 Color Developing Clutch ..................................................................................................................... 7 191
7.11.23 Cleaning Assembly Scoop Up Sheet ................................................................................................... 7 195
7.11.24 Secondary Transfer Unit ...................................................................................................................... 7 202
7.11.25 ITB Cleaning Unit................................................................................................................................ 7 203
7.11.26 ITB Cleaner End Scraper ..................................................................................................................... 7 209
7.11.27 Intermediate Transfer Unit................................................................................................................... 7 214
7.11.28 Intermediate Transfer Belt ................................................................................................................... 7 219
7.11.29 ITB Home Position Sensor PCB.......................................................................................................... 7 225
7.11.30 Secondary Transfer Roller Shift Motor ............................................................................................... 7 225
7.11.31 Primary Transfer Roller ....................................................................................................................... 7 226
7.11.32 Secondary Transfer Internal Roller...................................................................................................... 7 234
7.11.33 Secondary Transfer Roller ................................................................................................................... 7 240
Contents