Ricoh K-C3 Service Manual page 7

B245/B276/B277/B268/B269 Service Manual
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
18-Jan-06
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