Canon iR C2880 Series Service Manual page 223

Contents
7.1 Construction ...................................................................................................................................................................7-1
7.1.1 Specifications, Control Mechanisms, and Functions ................................................................................................................... 7-1
7.1.2 Overview...................................................................................................................................................................................... 7-2
7.1.3 Printing Process ........................................................................................................................................................................... 7-3
7.1.4 Static Image Formation Block ..................................................................................................................................................... 7-4
7.1.5 Developing Block ........................................................................................................................................................................ 7-6
7.1.6 Transfer Block ............................................................................................................................................................................. 7-7
7.1.7 Fixing Block................................................................................................................................................................................. 7-8
7.1.8 ITB Cleaning Block ..................................................................................................................................................................... 7-9
7.1.9 Photosensitive Drum Cleaning Block .......................................................................................................................................... 7-9
7.2 Driving and Controlling the High-Voltage System .....................................................................................................7-10
7.2.1 Overview.................................................................................................................................................................................... 7-10
7.2.2 Generation of the Primary Charging Bias.................................................................................................................................. 7-11
7.2.3 Generation of the Developing Bias............................................................................................................................................ 7-11
7.2.4 Generation of the Primary Transfer Bias ................................................................................................................................... 7-12
7.2.5 Generation of the Secondary Transfer Bias ............................................................................................................................... 7-12
7.3 Image Stabilization Control .........................................................................................................................................7-12
7.3.1 Overview of Image Stabilization ............................................................................................................................................... 7-12
7.3.2 Timing of Image Stabilization Control ...................................................................................................................................... 7-13
7.3.3 Drum Film Thickness Detection ................................................................................................................................................ 7-13
7.3.4 ATR Control .............................................................................................................................................................................. 7-14
7.3.5 D-max Control ........................................................................................................................................................................... 7-15
7.3.6 PASCAL Control ....................................................................................................................................................................... 7-18
7.3.7 D-half Control ............................................................................................................................................................................ 7-19
7.3.8 ARCDAT Control ...................................................................................................................................................................... 7-22
7.3.9 Color Displacement Correction Control .................................................................................................................................... 7-23
7.3.10 ATVC Control ......................................................................................................................................................................... 7-26
7.4 Special Control.............................................................................................................................................................7-27
7.4.1 Black band sequence.................................................................................................................................................................. 7-27
7.4.2 OHP black band sequence ......................................................................................................................................................... 7-28
7.4.3 Colour band sequence ................................................................................................................................................................ 7-28
7.5 Drum Unit ....................................................................................................................................................................7-30
7.5.1 Drum Unit .................................................................................................................................................................................. 7-30
7.5.1.1 Overview .......................................................................................................................................................................................................7-30
7.5.1.2 Detecting the Presence/Absence of the Drum Unit.......................................................................................................................................7-31
7.5.1.3 Identifying a New/Old Drum Unit ................................................................................................................................................................7-31
7.5.1.4 Opening/Closing the Toner Shutter ..............................................................................................................................................................7-33
7.6 Toner Container ...........................................................................................................................................................7-34
7.6.1 Overview.................................................................................................................................................................................... 7-34
7.6.2 Supplying Toner......................................................................................................................................................................... 7-34
7.6.3 Detecting the Level of Toner ..................................................................................................................................................... 7-36
7.6.4 Toner Container Detection......................................................................................................................................................... 7-37
7.7 Transfer Unit ................................................................................................................................................................7-37
7.7.1 Outline of the Transfer Unit....................................................................................................................................................... 7-37
7.7.1.1 Overview .......................................................................................................................................................................................................7-37
7.7.1.2 Primary Transfer Block.................................................................................................................................................................................7-38
7.7.1.3 ITB Soiling Removal Sequence Control.......................................................................................................................................................7-38
7.7.1.4 Secondary Transfer Block.............................................................................................................................................................................7-39
7.8 Waste Toner Collection Mechanism............................................................................................................................7-40
7.8.1 Collecting the Waste Toner ....................................................................................................................................................... 7-40
Contents