Canon iR8500 Service Manual page 11

Contents
8.6.1 Outline....................................................................................................................................................................8- 25
8.6.2 Controlling the Developing Assembly ....................................................................................................................8- 25
8.6.3 Controlling the Toner Cartridge Drive Mechanism.................................................................................................8- 26
8.6.4 Controlling the Developing Bias.............................................................................................................................8- 27
8.6.5 Detecting the Toner Level and Controlling the Toner Supply Mechanism.............................................................8- 28
8.7 Transfer Mechanism................................................................................................................................. 8- 31
8.7.1 Transfer Guide Bias ...............................................................................................................................................8- 31
8.7.1.1 Outline.................................................................................................................................................................................... 8- 31
8.7.1.2 Controlling the Output to Suit the Environment...................................................................................................................... 8- 31
8.7.2 Transfer Charging Mechanism...............................................................................................................................8- 32
8.7.2.1 Outline.................................................................................................................................................................................... 8- 32
8.7.2.2 Controlling the Output to Suit the Environment (fuzzy control) .............................................................................................. 8- 32
8.7.2.3 Correcting the Output at the Trailing Edge of Paper.............................................................................................................. 8- 33
8.7.2.4 Transfer Charging Assembly Cleaning Mechanism............................................................................................................... 8- 34
8.7.2.5 Others .................................................................................................................................................................................... 8- 35
8.8 Separation Mechanism............................................................................................................................. 8- 36
8.8.1 Separation Charging Mechanism...........................................................................................................................8- 36
8.8.1.1 Outline.................................................................................................................................................................................... 8- 36
8.8.1.2 Correcting the Output to Suit the Environment and the Toner Deposit.................................................................................. 8- 36
8.8.1.3 Correcting the Output upon Detection of Leakage................................................................................................................. 8- 37
8.8.1.4 Others .................................................................................................................................................................................... 8- 38
8.9 Parts Replacement Procedure ................................................................................................................. 8- 39
8.9.1 Process Unit...........................................................................................................................................................8- 39
8.9.1.1 Removing the Process Unit ................................................................................................................................................... 8- 39
8.9.1.2 Removing the Process Unit ................................................................................................................................................... 8- 39
8.9.1.3 Mounting the Process Unit..................................................................................................................................................... 8- 40
8.9.1.4 Mounting the Process Unit..................................................................................................................................................... 8- 41
8.9.2 Pre-Exposure Lamp ...............................................................................................................................................8- 41
8.9.2.1 Removing the Pre-Exposure Lamp Unit ................................................................................................................................ 8- 41
8.9.3 Primary Charging Assembly ..................................................................................................................................8- 41
8.9.3.1 Removing the Primary Charging Assembly ........................................................................................................................... 8- 41
8.9.4 Pre-Transfer Charging Assembly...........................................................................................................................8- 42
8.9.4.1 Removing the Pre-Transfer Charging Assembly ................................................................................................................... 8- 42
8.9.5 Photosensitive Drum..............................................................................................................................................8- 42
8.9.5.1 Points to Note When Handling the Photosensitive Drum....................................................................................................... 8- 42
8.9.5.2 Points to Note When Handling the Photosensitive Drum....................................................................................................... 8- 42
8.9.5.3 Removing the Photosensitive Drum....................................................................................................................................... 8- 42
8.9.5.4 Removing the Photosensitive Drum....................................................................................................................................... 8- 43
8.9.6 Drum Cleaner Unit .................................................................................................................................................8- 44
8.9.6.1 Construction........................................................................................................................................................................... 8- 44
8.9.6.2 Construction........................................................................................................................................................................... 8- 44
8.9.6.3 Removing the Cleaning Blade ............................................................................................................................................... 8- 44
8.9.6.4 Removing the Cleaning Blade ............................................................................................................................................... 8- 45
8.9.6.5 Mounting the Cleaning Blade................................................................................................................................................. 8- 45
8.9.6.6 Mounting the Cleaning Blade................................................................................................................................................. 8- 46
8.9.6.7 Removing the Blade Vibrating Unit ........................................................................................................................................ 8- 46
8.9.7 Photosensitive Drum Heater ..................................................................................................................................8- 46
8.9.7.1 Replacing the Photosensitive Drum Heater ........................................................................................................................... 8- 46
8.9.8 Developing Assembly ............................................................................................................................................8- 47
8.9.8.1 Removing the Developing Assembly ..................................................................................................................................... 8- 47
8.9.8.2 Removing the Hopper ............................................................................................................................................................ 8- 47
8.9.9 Developing Cylinder...............................................................................................................................................8- 47
8.9.9.1 Removing the Developing Cylinder........................................................................................................................................ 8- 47
8.9.10 Developing Blade .................................................................................................................................................8- 49
8.9.10.1 Removing the Blade Unit ..................................................................................................................................................... 8- 49
8.9.10.2 Mounting the Blade .............................................................................................................................................................. 8- 49
8.9.11 Developing Cylinder Deceleration Clutch.............................................................................................................8- 49
8.9.11.1 Remove the Developing Cylinder Deceleration Clutch ........................................................................................................ 8- 49
8.9.11.2 Remove the Developing Cylinder Deceleration Clutch ........................................................................................................ 8- 50
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