Canon iR C3200 Series, Service Manual, Page: 287 / 1216

Contents
Contents
9.1 Construction ...................................................................................................................................................... 9-1
9.1.1 Specifications, Control Mechanisms, and Functions ................................................................................. 9-1
9.1.2 Major Components of the Image Formation System ................................................................................. 9-3
9.1.3 Charging Specifications ............................................................................................................................. 9-4
9.2 Image Formation Process .................................................................................................................................. 9-6
9.2.1 Image Formation Process (general) ............................................................................................................ 9-6
9.2.2 Image Formation Process (image formation) ............................................................................................. 9-7
9.2.3 Image Formation Process (transfer) ........................................................................................................... 9-7
9.3 Basic Sequence .................................................................................................................................................. 9-8
9.3.1 At Power-On (1) ......................................................................................................................................... 9-8
9.3.2 At Power-On (2) ......................................................................................................................................... 9-8
9.3.3 During Copying/Printing Operations (normal speed) ................................................................................ 9-9
9.3.4 Making Copies/Prints (half speed) ........................................................................................................... 9-10
9.3.5 After Replacing the Drum Unit (D-UNIT) ............................................................................................... 9-10
9.3.6 Printing Originals Containing a Color Page ............................................................................................. 9-11
9.3.7 Driving and Controlling the Image Formation System and the High-Voltage System ............................ 9-11
9.4 Image Stabilization Control ............................................................................................................................. 9-13
9.4.1 Outline of Image Quality Control ............................................................................................................ 9-13
9.4.2 Automatic Image Stabilization Control .................................................................................................... 9-13
9.4.3 ATR Control ............................................................................................................................................. 9-17
9.4.4 Discharge Current Level Control ............................................................................................................. 9-17
9.4.5 ATVC Control (transfer bias level correction) ......................................................................................... 9-18
9.4.6 PASCAL Control (image gradation) ........................................................................................................ 9-18
9.4.7 SALT-Dmax Control (development characteristics correction) .............................................................. 9-19
9.4.8 SALT-Dhalf Control (development characteristics correction) ............................................................... 9-20
9.4.9 Auto Gradation Control ............................................................................................................................ 9-22
9.5 Drum Unit ........................................................................................................................................................ 9-24
9.5.1 Outline of the Drum Unit ......................................................................................................................... 9-24
9.5.1.1 Outline of the Drum Unit .................................................................................................................. 9-24
9.5.1.2 Controlling the Drive of the Drum Unit (D-UNIT) ........................................................................... 9-25
9.5.2 Developing Assembly .............................................................................................................................. 9-26
9.5.2.1 Construction of the Developing Assembly ........................................................................................ 9-26
9.5.2.2 Controlling the Developing Bias ....................................................................................................... 9-27
9.5.3 Auxiliary Brush ........................................................................................................................................ 9-29
9.5.3.1 Construction of the Auxiliary Brush ................................................................................................. 9-29
9.5.3.2 Controlling the Auxiliary Bias .......................................................................................................... 9-30
9.5.4 Charging Mechanism ............................................................................................................................... 9-34
9.5.4.1 Construction of the Charging Mechanism ......................................................................................... 9-34
9.5.4.2 Controlling the Charging Bias ........................................................................................................... 9-35
9.6 Toner Container ............................................................................................................................................... 9-37
9.6.1 Outline of the Toner Container ................................................................................................................ 9-37
9.6.2 Controlling the Toner Container Drive .................................................................................................... 9-37
9.6.3 Checking the Level of Toner .................................................................................................................... 9-38
9.6.4 Controlling the Supply of Toner .............................................................................................................. 9-39
9.7 Transfer Unit ................................................................................................................................................... 9-40
9.7.1 Outline of the Transfer Unit ..................................................................................................................... 9-40
9.7.1.1 Outline of the Transfer Unit .............................................................................................................. 9-40
9.7.1.2 Controlling the Drive of the Transfer Unit ........................................................................................ 9-40
9.7.2 Controlling the Transfer Bias ................................................................................................................... 9-42