Canon iR8500 Service Manual page 31

CONTENTS
5.3 Digital Image Processing ......... 2-89
5.3.1 Outline ............................... 2-89
5.3.2 Shading Correction ............ 2-89
5.3.3 Auto Density Adjustment
(AE) ................................... 2-91
5.4 Disassembly/Assembly
(iR7200) ................................... 2-94
5.4.1 CCD/AP PCB .................... 2-95
5.4.2 Reader Controller PCB ...... 2-96
5.4.3 Hard Disk ........................... 2-97
6 Laser Exposure System .................. 2-100
6.1 Outline ................................... 2-100
6.2 Changes in the Laser
Exposure System ................... 2-102
6.3 Disassembly/Assembly .......... 2-103
6.3.1 Reader Unit ...................... 2-104
6.3.2 Laser Unit ........................ 2-105
6.3.3 BD Unit ........................... 2-106
7 Image Formation System ................ 2-108
7.1 Outline ................................... 2-108
7.2 Changes in the Image
formation System ................... 2-110
7.3 Photosensitive Drum .............. 2-111
7.4 Pre-Transfer Exposure LED
(addition) ................................ 2-111
7.5 Preventing Overheating of
the Developing Unit ............... 2-112
7.6 Development Fan ................... 2-112
7.7 Revising the Developing
Cylinder Cover ....................... 2-112
7.8 2-Speed Drive of
the Developing Cylinder ........ 2-114
7.9 Disassembly/Assembly .......... 2-116
7.9.1 Process Unit ..................... 2-117
7.9.2 Charging Wires ................ 2-122
7.9.3 Area Around the Process
Unit .................................. 2-128
8 Pickup/Feeding System .................. 2-131
8.1 Outline ................................... 2-131
8.2 Changes to the Pickup/Feed
System (iR8500) .................... 2-132
8.3 List of Changes Made to
the Pickup/Feeding System
(iR7200) ................................. 2-133
8.4 Index Sheet Attachment ......... 2-133
8.5 Disassembly/Assembly .......... 2-134
8.5.1 Manual Feed Tray
Assembly ......................... 2-135
8.5.2 Vertical Path Roller
Assembly ......................... 2-139
8.5.3 Registration Feed
Assembly ......................... 2-142
8.5.4 Duplexing Unit ................ 2-143
8.5.5 Others .............................. 2-145
9 Fixing System ................................. 2-146
9.1 Outline ................................... 2-146
9.2 Changes to the Fixing
System .................................... 2-148
9.3 Controlling the Fixing
Temperature ........................... 2-149
9.4 Transparency Mode ............... 2-150
9.5 Thick Paper Mode .................. 2-151
9.6 Power Save Mode .................. 2-152
9.7 Error Detection ...................... 2-153
9.8 Down Sequence Control
(100V) .................................... 2-154
9.9 Disassembly/Assembly .......... 2-156
9.9.1 Fixing Heater and
the Control Parts .............. 2-157
9.9.2 Fixing Roller Assembly ... 2-163
9.9.3 Delivery Assembly ........... 2-166
9.9.4 Paper Sensors ................... 2-169
10 Externals/Auxiliary Controls ......... 2-173
10.1 Changes Made to
the Externals/Auxiliary
Controls .................................. 2-173
10.2 Fans ........................................ 2-174
10.3 Sequence of Operations
(fans) ...................................... 2-176
10.4 Disassembly/Assembly .......... 2-178
10.4.1 External Covers ............... 2-179
10.4.2 Control Panel ................... 2-191
10.4.4 Drive Assembly ............... 2-205
10.4.5 Switches ........................... 2-209
10.4.6 PCBs ................................ 2-211
10.4.7 Others .............................. 2-223
11 Side Paper Deck ............................ 2-227
11.1 Outline ............................. 2-227
CANON iR8500/7200 REV.1 AUG. 2001