Ricoh K-C3 Service Manual page 7

B245/B276/B277/B268/B269 Service Manual
Original Jam History Display (SP 7508)..................................................................... 173
ADF APS Sensor Output Display (SP 6901).............................................................. 174
Detailed Section Descriptions ........................................................................................... 175
Overview .......................................................................................................................175
Component Layout .................................................................................................... 175
Paper Path................................................................................................................. 176
Drive Layout .............................................................................................................. 177
Board Structure ............................................................................................................. 178
Block Diagram ........................................................................................................... 178
BICU (Base Engine and Image Control Unit)............................................................. 178
SBU (Sensor Board Unit)........................................................................................... 179
Copy Process Overview ................................................................................................ 180
Scanning .......................................................................................................................182
Overview.................................................................................................................... 182
Scanner Drive............................................................................................................ 183
Original Size Detection in Platen Mode ..................................................................... 184
Image Processing ......................................................................................................... 186
Overview.................................................................................................................... 186
SBU (Sensor Board Unit)........................................................................................... 187
IPU (Image Processing Unit) ..................................................................................... 188
Video Control Unit (VCU)........................................................................................... 199
Laser Exposure ............................................................................................................. 200
Overview.................................................................................................................... 200
Auto Power Control (APC)......................................................................................... 201
LD Safety Switch ....................................................................................................... 202
Photoconductor Unit (PCU)........................................................................................... 203
Overview.................................................................................................................... 203
Drive ..........................................................................................................................204
Drum Charge................................................................................................................. 205
Overview.................................................................................................................... 205
Charge Roller Voltage Correction .............................................................................. 206
ID Sensor Pattern Production Timing ........................................................................ 207
Drum Charge Roller Cleaning.................................................................................... 207
Development ................................................................................................................. 208
Overview.................................................................................................................... 208
Drive ..........................................................................................................................209
18-Jan-06
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