Ricoh R-C4 Service Manual page 7

3.7 PHOTOCONDUCTOR UNIT (PCU) ........................................................3-18
3.7.1 PCU REMOVAL..............................................................................3-18
3.7.2 PICK-OFF PAWLS .........................................................................3-19
3.7.3 OPC DRUM ....................................................................................3-20
3.7.4 CHARGE ROLLER, CLEANING ROLLER .....................................3-21
3.7.5 CLEANING BLADE.........................................................................3-22
3.7.6 DEVELOPER..................................................................................3-23
3.7.7 AFTER REPLACEMENT OF PCU COMPONENTS .......................3-27
3.8 TRANSFER UNIT....................................................................................3-28
3.8.1 TRANSFER ROLLER UNIT............................................................3-28
3.8.2 IMAGE DENSITY SENSOR ...........................................................3-29
3.9 FUSING/EXIT ..........................................................................................3-30
3.9.1 FUSING UNIT.................................................................................3-30
3.9.2 THERMISTORS..............................................................................3-30
3.9.3 THERMOSTATS.............................................................................3-31
3.9.4 HOT ROLLER AND FUSING LAMP ...............................................3-33
3.9.5 PRESSURE ROLLER/CLEANING ROLLER ..................................3-35
3.9.6 PAPER EXIT SENSOR/PAPER OVERFLOW SENSOR................3-36
3.10 PAPER FEED........................................................................................3-37
3.10.1 FEED ROLLER: TRAY 1 ..............................................................3-37
3.10.2 FEED ROLLER: TRAY 2 ..............................................................3-38
3.10.3 PAPER END SENSOR.................................................................3-39
3.10.4 PAPER TRAY LIFT MOTORS ......................................................3-40
3.10.5 REGISTRATION CLUTCH ...........................................................3-41
3.10.6 PAPER FEED CLUTCHES...........................................................3-42
Lower Paper Feed Clutch ...................................................................3-42
Upper Paper Feed Clutch. ..................................................................3-42
3.10.7 RELAY CLUTCHES......................................................................3-43
3.10.8 PAPER SIZE DETECTOR............................................................3-44
3.10.9 REGISTRATION SENSOR...........................................................3-45
3.10.10 RELAY SENSORS .....................................................................3-46
Upper Relay Sensor............................................................................3-46
Lower Relay Sensor............................................................................3-46
3.10.11 DUST COLLECTION BOX .........................................................3-47
3.11 PCBS AND OTHER ITEMS...................................................................3-48
3.11.1 CONTROLLER BOARD ...............................................................3-48
3.11.2 NVRAM.........................................................................................3-49
3.11.3 SBCU BOARD ..............................................................................3-50
3.11.4 POWER PACK .............................................................................3-51
3.11.5 MAIN MOTOR ..............................................................................3-52
3.11.6 PSU ..............................................................................................3-53
3.11.7 IPU................................................................................................3-54
3.11.8 HDD..............................................................................................3-55
Important Notes About HDD Replacement .........................................3-56
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