Ricoh G157 Service Manual page 14

3.3.7 EXIT ROLLER ................................................................................3-10
3.3.8 EXIT PRESSURE ROLLER............................................................3-11
3.3.9 TRANSPORT ROLLER ..................................................................3-11
3.3.10 TRANSPORT PRESSURE ROLLER 2.........................................3-11
3.3.11 ADF MOTOR ................................................................................3-12
3.3.12 LEADING EDGE AND TRAILING EDGE SENSOR BOARD........3-13
3.3.13 ADF UNIT .....................................................................................3-14
3.4 OPERATION PANEL...............................................................................3-15
3.4.1 OPERATION PANEL BOARD ........................................................3-15
3.4.2 LCD PANEL....................................................................................3-16
3.5 OPTICS UNIT..........................................................................................3-17
3.5.1 CAUTION DECAL LOCATION .......................................................3-17
3.5.2 REMOVING THE LASER OPTICS UNIT........................................3-17
3.6 OPC.........................................................................................................3-18
3.6.1 OPC BELT UNIT.............................................................................3-18
3.6.2 OPC BELT SENSOR......................................................................3-19
3.6.3 CHARGE ROLLER AND CLEANING ROLLER ..............................3-19
3.6.4 ERASE LAMP.................................................................................3-20
3.7 DEVELOPMENT .....................................................................................3-21
3.7.1 TONER END SENSOR ..................................................................3-21
Emitter ................................................................................................3-21
Receptor .............................................................................................3-21
3.7.2 DEVELOPMENT UNIT SENSOR AND DEVELOPMENT CLUTCH ...3-22
3.8 TRANSFER BELT ...................................................................................3-23
3.8.1 TRANSFER BELT UNIT .................................................................3-23
3.8.2 TRANSFER BELT SENSOR AND ID SENSOR .............................3-23
3.8.3 TRANSFER BELT CLEANING UNIT AND WASTE TONER DUCT ...3-24
3.9 WASTE TONER COLLECTION UNIT .....................................................3-25
3.9.1 WASTE TONER BOTTLE ..............................................................3-25
3.9.2 WASTE TONER BOTTLE HOLDER...............................................3-25
3.9.3 WASTE TONER DUCT ..................................................................3-26
3.10 PAPER FEED........................................................................................3-27
3.10.1 PAPER FEED ROLLER AND SEPARATOR PAD........................3-27
3.10.2 OHP SENSOR, PAPER END SENSOR,
AND REGISTRATION SENSOR ..................................................3-27
3.10.3 TEMPERATURE SENSOR, PAPER SIZE SENSOR
AND PAPER TRAY SENSOR ......................................................3-28
3.11 PAPER TRANSFER AND PAPER EXIT ...............................................3-29
3.11.1 TRANSFER ROLLER UNIT..........................................................3-29
3.11.2 PAPER EXIT SENSOR AND PAPER OVERFLOW SENSOR .....3-29
3.11.3 DISCHARGE BRUSH...................................................................3-30
3.12 FUSING UNIT AND FUSING LAMP......................................................3-31
3.13 CIRCUIT BOARD ..................................................................................3-33
3.13.1 BASE ENGINE CONTROL UNIT (BCU).......................................3-33
Before you Replace the BCU..............................................................3-33
Replacement Procedure .....................................................................3-33
After you Replace the BCU.................................................................3-33
3.13.2 CONTROLLER .............................................................................3-34
Replacement procedure......................................................................3-34
G157 ii SM