Canon iR3570 Service Manual page 233

Contents
7.1 Construction ...................................................................................................................................................................7-1
7.1.1 Specifications of the Image Formation System ........................................................................................................................... 7-1
7.1.2 Major Components of the Image Formation System ................................................................................................................... 7-1
7.2 Image Formation Process...............................................................................................................................................7-2
7.2.1 Image Formation Process (outline) .............................................................................................................................................. 7-2
7.2.2 Image Formation Process (image formation) .............................................................................................................................. 7-3
7.3 Basic Sequence ..............................................................................................................................................................7-3
7.3.1 Sequence of Operation (initial rotation) ...................................................................................................................................... 7-3
7.3.2 Sequence of Operation (initial rotation) ...................................................................................................................................... 7-4
7.3.3 Sequence of Operation (copying) ................................................................................................................................................ 7-4
7.3.4 Sequence of Operation (copying) ................................................................................................................................................ 7-5
7.3.5 Sequence of Operation (last rotation) .......................................................................................................................................... 7-5
7.3.6 Sequence of Operation (last rotation) .......................................................................................................................................... 7-5
7.4 Image Stabilization Control ...........................................................................................................................................7-6
7.4.1 Overview...................................................................................................................................................................................... 7-6
7.4.2 APVC Control.............................................................................................................................................................................. 7-6
7.4.3 ATVC Control ............................................................................................................................................................................. 7-6
7.5 Drum Unit ......................................................................................................................................................................7-6
7.5.1 Charging Mechanism ................................................................................................................................................................... 7-6
7.5.1.1 Controlling the Primary Charging Bias...........................................................................................................................................................7-6
7.5.1.2 Primary Charging Roller Cleaning Mechanism ..............................................................................................................................................7-7
7.6 Drum Cleaner Unit.........................................................................................................................................................7-7
7.6.1 Photosensitive Drum Cleaning .................................................................................................................................................... 7-7
7.7 Developing Unit.............................................................................................................................................................7-7
7.7.1 Controlling the Developing Bias ................................................................................................................................................. 7-7
7.8 Toner Container .............................................................................................................................................................7-8
7.8.1 Overview...................................................................................................................................................................................... 7-8
7.8.2 Route of Toner Supply................................................................................................................................................................. 7-8
7.8.3 Controlling the Drive of the Toner Cartridge .............................................................................................................................. 7-9
7.8.4 Toner Supply Control .................................................................................................................................................................. 7-9
7.8.5 Recovery Sequence .................................................................................................................................................................... 7-10
7.8.6 Toner Level Detection ............................................................................................................................................................... 7-10
7.9 Transfer Unit ................................................................................................................................................................7-10
7.9.1 Outline of the Transfer Unit....................................................................................................................................................... 7-10
7.9.1.1 Outline...........................................................................................................................................................................................................7-10
7.9.2 Controlling the Transfer Bias..................................................................................................................................................... 7-10
7.9.2.1 Transfer Roller Bias Control .........................................................................................................................................................................7-10
7.9.3 Cleaning ..................................................................................................................................................................................... 7-11
7.9.3.1 Transfer Roller Cleaning Mechanism ...........................................................................................................................................................7-11
7.9.4 Separation Mechanism............................................................................................................................................................... 7-11
7.9.4.1 Controlling the Static Eliminator Bias ..........................................................................................................................................................7-11
7.10 Transfer Mechanism ..................................................................................................................................................7-11
7.10.1 Transfer Guide Bias ................................................................................................................................................................. 7-11
7.10.1.1 Transfer Guide Bias Control .......................................................................................................................................................................7-11
7.11 Photosensitive Drum Cleaning...................................................................................................................................7-11
7.11.1 Outline...................................................................................................................................................................................... 7-11
7.11.2 Collection of Waste Toner ....................................................................................................................................................... 7-11
7.11.3 Checking the Waste Toner Box ............................................................................................................................................... 7-11
7.12 Parts Replacement Procedure.....................................................................................................................................7-12
7.12.1 Pre-Exposure Lamp ................................................................................................................................................................. 7-12
Contents