B245/B276/B277/B268/B269 Service Manual 18-Jan-06
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ADF APS Sensor Output Display (SP 6901)..............................................................191
Detailed Section Descriptions........................................................................................... 193
Overview .......................................................................................................................193
Component Layout ....................................................................................................193
Paper Path................................................................................................................. 194
Drive Layout ..............................................................................................................195
Board Structure ............................................................................................................. 196
Block Diagram ........................................................................................................... 196
BICU (Base Engine and Image Control Unit)............................................................. 197
SBU (Sensor Board Unit)...........................................................................................197
Copy Process Overview................................................................................................ 198
Scanning .......................................................................................................................200
Overview....................................................................................................................200
Scanner Drive............................................................................................................ 201
Original Size Detection in Platen Mode ..................................................................... 202
Image Processing ......................................................................................................... 205
Overview....................................................................................................................205
SBU (Sensor Board Unit)...........................................................................................206
IPU (Image Processing Unit) ..................................................................................... 207
Video Control Unit (VCU)........................................................................................... 218
Laser Exposure ............................................................................................................. 219
Overview....................................................................................................................219
Auto Power Control (APC)......................................................................................... 220
LD Safety Switch ....................................................................................................... 221
Photoconductor Unit (PCU)........................................................................................... 222
Overview....................................................................................................................222
Drive ..........................................................................................................................223
Drum Charge................................................................................................................. 224
Overview....................................................................................................................224
Charge Roller Voltage Correction .............................................................................. 225
ID Sensor Pattern Production Timing ........................................................................226
Drum Charge Roller Cleaning.................................................................................... 226
Development .................................................................................................................227
Overview....................................................................................................................227
Drive ..........................................................................................................................228
Developer Mixing.......................................................................................................228
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