Canon iR3245 Series Service Manual page 12

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Contents
6.4.1.1 Before Removing the Laser Unit.............................................................................................................................................. 6- 8
6.4.1.2 Removing the Laser Unit ......................................................................................................................................................... 6- 8
6.4.1.3 After Replacing the Laser Scanner Unit................................................................................................................................... 6- 8
Chapter 7 Image Formation
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- 2
7.2 Image Formation Process .......................................................................................................................... 7- 3
7.2.1 Image Formation Process (outline)..........................................................................................................................7- 3
7.2.2 Image Formation Process (image formation)...........................................................................................................7- 4
7.3 Basic Sequence ......................................................................................................................................... 7- 5
7.3.2 Sequence of Operation (copying) ............................................................................................................................7- 5
7.3.3 Sequence of Operation (last rotation) ......................................................................................................................7- 6
7.4 Image Stabilization Control ........................................................................................................................ 7- 7
7.4.1 Overview ..................................................................................................................................................................7- 7
7.4.2 APVC Control...........................................................................................................................................................7- 7
7.4.3 ATVC Control...........................................................................................................................................................7- 7
7.4.4 PASCAL Control (image gradation) .........................................................................................................................7- 8
7.5 Drum Unit ................................................................................................................................................... 7- 9
7.5.1 Outline of the Drum Unit ..........................................................................................................................................7- 9
7.5.1.1 Configuration............................................................................................................................................................................ 7- 9
7.5.2 Charging Mechanism .............................................................................................................................................7- 10
7.5.2.1 Controlling the Primary Charging Bias................................................................................................................................... 7- 10
7.5.2.2 Primary Charging Roller Cleaning Mechanism ...................................................................................................................... 7- 10
7.6 Drum Cleaner Unit.................................................................................................................................... 7- 10
7.6.1 Photosensitive Drum Cleaning...............................................................................................................................7- 10
7.7 Developing Unit ........................................................................................................................................ 7- 11
7.7.1 Configuration..........................................................................................................................................................7- 11
7.7.2 Controlling the Developing Bias.............................................................................................................................7- 11
7.8 Toner Container ....................................................................................................................................... 7- 12
7.8.1 Configuration..........................................................................................................................................................7- 12
7.8.2 Route of Toner Supply ...........................................................................................................................................7- 13
7.8.3 Controlling the Drive of the Toner Cartridge ..........................................................................................................7- 13
7.8.4 Toner Supply Control .............................................................................................................................................7- 14
7.8.5 Recovery Sequence...............................................................................................................................................7- 14
7.8.6 Toner Level Detection............................................................................................................................................7- 14
7.9 Transfer Unit............................................................................................................................................. 7- 15
7.9.1 Outline of the Transfer Unit....................................................................................................................................7- 15
7.9.1.1 Outline.................................................................................................................................................................................... 7- 15
7.9.2 Controlling the Transfer Bias .................................................................................................................................7- 15
7.9.2.1 Transfer Roller Bias Control................................................................................................................................................... 7- 15
7.9.3 Cleaning.................................................................................................................................................................7- 15
7.9.3.1 Transfer Roller Cleaning Mechanism..................................................................................................................................... 7- 15
7.9.4 Separation Mechanism ..........................................................................................................................................7- 15
7.9.4.1 Controlling the Static Eliminator Bias..................................................................................................................................... 7- 15
7.10 Transfer Mechanism ............................................................................................................................... 7- 16
7.10.1 Transfer Guide Bias .............................................................................................................................................7- 16
7.10.1.1 Transfer Guide Bias Control................................................................................................................................................. 7- 16
7.11 Photosensitive Drum Cleaning ............................................................................................................... 7- 17
7.11.1 Outline..................................................................................................................................................................7- 17
7.11.2 Collection of Waste Toner....................................................................................................................................7- 17
7.11.3 Checking the Waste Toner Box ...........................................................................................................................7- 17
7.12 Parts Replacement Procedure ............................................................................................................... 7- 18

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