Canon iR8500 Service Manual page 42

2.4.2 Outline of the Image
Formation System .............. 2-29
2.4.3 Photosensitive drum .......... 2-30
2.4.4 Pre-Transfer Exposure
LED ................................... 2-30
2.4.5 Preventing Overheating of
the Developing Unit ........... 2-32
2.4.6 Development Fan ............... 2-32
2.4.7 Revising the Developing
Cylinder Cover .................. 2-32
2.4.8 2-Speed Drive of the
Developing Cylinder .......... 2-34
2.5 Pickup/Feed System ................. 2-37
2.5.1 Changes to the Pickup/
Feed System ....................... 2-37
2.5.2 Outline of the Pickup/
Feed System ....................... 2-39
2.5.3 Index Sheet Attachment ..... 2-39
2.6 Fixing System .......................... 2-41
2.6.1 Changes to the Fixing
System ............................... 2-41
CHAPTER 3 MAIN CONTROLLER
1 Basic Operation .................................. 3-1
1.1 Functional Construction ............ 3-1
1.2 Outline of the Electrical
Circuit ........................................ 3-2
1.2.1 Outline ................................. 3-2
1.2.2 Main Controller PCB ........... 3-2
1.2.3 Hard Disk Drive ................... 3-2
1.3 Start-Up Sequence ..................... 3-4
1.3.1 Outline ................................. 3-4
1.3.2 Start-Up Sequence ............... 3-5
1.3.3 Composition of the System
Software ............................... 3-6
1.4 Inputs to and Outputs from
the Major PCBs .......................... 3-7
1.4.1 Wiring Diagram of the
Major PCBs ......................... 3-7
2 Digital image Processing .................... 3-8
2.1 Outline ....................................... 3-8
2.2 Input Image Processing .............. 3-9
2.2.1 Image Data from the Reader
Unit ...................................... 3-9
COPYRIGHT© 2001 CANON INC.
2.6.2
2.6.3
2.6.4
2.6.5
2.6.6
2.6.7
2.6.8
2.7 Externals
2.7.1
2.7.2
2.7.3
2.8 Side Pape
2.8.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.3 Controlling the Image
Memory .................................... 3-10
2.3.1
2.3.2
2.3.3
2.4 Processing Output Image ......... 3-10
2.4.1
CANON iR8500 REV.1 MAR. 2001
CONTENTS
Outline for the Fixing
Assembly ........................... 2-43
Controlling the Fixing
Temperature ....................... 2-45
Transparency Mode ........... 2-46
Thick Paper Mode ............. 2-47
Power Save Mode .............. 2-48
Error ................ 2-49
Down Control .... 2-50
Controls ... 2-51
Chang
the Ex xiliary
Contr ................ 2-51
Fans ................ 2-53
Seque rations
(fans) ................ 2-55
................ 2-57
Outlin e Paper
Deck ................ 2-57
Enlar uction
(main irection) .... 3-9
Edge .................. 3-9
Editin .................. 3-9
Densi on
(LUT) .................. 3-9
Binary Processing
(error diffusion method;
T-BASIC) ............................. 3-9
Binary Processing
(dither screen method) ....... 3-10
Compression/Expansion,
Rotation, and Enlargement/
Reduction ........................... 3-10
SDRAM ............................. 3-10
HDD .................................. 3-10
Smoothing ......................... 3-10
xi