Canon imageRUNNER 7105 Service Manual page 7

Contents
7.7.1 Outline...................................................................................................................................................... 7- 19
7.7.2 Controlling the Developing Assembly .................................................................................................7- 20
7.7.3 Controlling the Toner Cartridge Drive Mechanism ...........................................................................7- 21
7.7.4 Controlling the Developing Bias........................................................................................................... 7- 22
7.7.5 Detecting the Toner Level and Controlling the Toner Supply Mechanism ...................................7- 23
7.8 Transfer Mechanism ..................................................................................................................................... 7- 27
7.8.1 Transfer Guide Bias ............................................................................................................................... 7- 27
7.8.1.1 Overview........................................................................................................................................... 7- 27
7.8.1.2 Controlling the Output to Suit the Environment.......................................................................... 7- 28
7.8.2 Transfer Charging Mechanism .............................................................................................................7- 29
7.8.2.1 Outline...............................................................................................................................................7- 29
7.8.2.2 Controlling the Output to Suit the Environment (fuzzy control)................................................ 7- 30
7.8.2.3 Correcting the Output at the Trailing Edge of Paper ................................................................. 7- 30
7.8.2.4 Transfer Charging Assembly Cleaning Mechanism ..................................................................7- 31
7.8.2.5 Others ...............................................................................................................................................7- 32
7.9 Separation Mechanism ................................................................................................................................7- 33
7.9.1 Separation Charging Mechanism......................................................................................................... 7- 33
7.9.1.1 Outline...............................................................................................................................................7- 33
7.9.1.2 Correcting the Output to Suit the Environment and the Toner Deposit.................................. 7- 34
7.9.1.3 Correcting the Output upon Detection of Leakage .................................................................... 7- 34
7.9.1.4 Others ...............................................................................................................................................7- 34
7.10 Parts Replacement Procedure..................................................................................................................7- 35
7.10.1 Process Unit ..........................................................................................................................................7- 35
7.10.2 Pre-Exposure Lamp .............................................................................................................................7- 36
7.10.3 Primary Charging Assembly ...............................................................................................................7- 37
7.10.4 Pre-Transfer Charging Assembly.......................................................................................................7- 37
7.10.5 Photosensitive Drum ............................................................................................................................ 7- 38
7.10.6 Drum Cleaner Unit................................................................................................................................7- 39
7.10.7 Photosensitive Drum Heater ...............................................................................................................7- 40
7.10.8 Sub Hopper............................................................................................................................................7- 40
7.10.9 Developing Assembly ..........................................................................................................................7- 42
7.10.10 Developing Cylinder ...........................................................................................................................7- 43
7.10.11 Developing Blade................................................................................................................................7- 44
7.10.12 Developing Cylinder Deceleration Clutch ....................................................................................... 7- 45
7.10.13 Developing Cylinder Clutch...............................................................................................................7- 46
7.10.14 Transfer/Separation Charging Assembly........................................................................................ 7- 46
7.10.15 Pre-Transfer Exposure LED.............................................................................................................. 7- 47
7.10.16 Separation Claw/Separation Claw Drive Assembly ...................................................................... 7- 47
7.10.17 Potential Sensor.................................................................................................................................. 7- 48
7.10.18 Dust-Collecting Roller ........................................................................................................................7- 50
7.10.19 Charging Wire ..................................................................................................................................... 7- 50
Chapter 8 Pickup/Feeding System
8.1 Construction ..................................................................................................................................................... 8- 1
8.1.1 Specifications and Construction ............................................................................................................ 8- 1
8.1.2 Arrangement of Rollers and Sensors.................................................................................................... 8- 1
8.1.3 Control System ......................................................................................................................................... 8- 2
8.1.4 Controlling the Pickup Motor (M2)......................................................................................................... 8- 3