Ricoh G108 Service Manual page 14

3.4 DEVELOPMENT .......................................................................................3-8
3.4.1 TONER END SENSOR ....................................................................3-8
Emitter ..................................................................................................3-8
Receptor ...............................................................................................3-8
3.4.2 DEVELOPMENT UNIT SENSOR AND DEVELOPMENT CLUTCH .3-9
3.5 TRANSFER BELT ...................................................................................3-10
3.5.1 TRANSFER BELT UNIT .................................................................3-10
3.5.2 TRANSFER BELT SENSOR AND ID SENSOR .............................3-10
3.5.3 TRANSFER BELT CLEANING UNIT AND WASTE TONER DUCT3-11
3.6 WASTE TONER COLLECTION UNIT .....................................................3-12
3.6.1 WASTE TONER BOTTLE ..............................................................3-12
3.6.2 WASTE TONER BOTTLE HOLDER...............................................3-12
3.6.3 WASTE TONER DUCT ..................................................................3-13
3.7 PAPER FEED..........................................................................................3-14
3.7.1 PAPER FEED ROLLER AND SEPARATOR PAD..........................3-14
3.7.2 OHP SENSOR, PAPER END SENSOR, AND REGISTRATION
SENSOR ........................................................................................3-14
3.7.3 TEMPERATURE SENSOR, PAPER SIZE SENSOR AND
PAPER TRAY SENSOR.................................................................3-15
3.8 PAPER TRANSFER AND PAPER EXIT .................................................3-16
3.8.1 TRANSFER ROLLER UNIT............................................................3-16
3.8.2 PAPER EXIT SENSOR AND PAPER OVERFLOW SENSOR .......3-16
3.8.3 DISCHARGE BRUSH.....................................................................3-17
3.9 FUSING UNIT AND FUSING LAMP........................................................3-18
3.10 CIRCUIT BOARD ..................................................................................3-20
3.10.1 CONTROLLER AND BASE ENGINE CONTROL UNIT................3-20
3.10.2 INPUT OUTPUT DEVICE.............................................................3-21
3.10.3 DIRECT CURRENT UNIT ............................................................3-22
3.10.4 HIGH VOLTAGE UNIT .................................................................3-23
3.11 DRIVE PATH .........................................................................................3-24
3.11.1 MAIN MOTOR DRIVE PATH ........................................................3-24
3.11.2 DEVELOPMENT MOTOR DRIVE PATH......................................3-26
3.12 EXHAUST FAN .....................................................................................3-27
3.12.1 OPTICS UNIT FAN.......................................................................3-27
3.12.2 PSU FAN ......................................................................................3-27
3.12.3 FUSING FAN ................................................................................3-28
3.13 INTERLOCK SWITCH ...........................................................................3-29
3.13.1 FRONT COVER SWITCH ............................................................3-29
3.13.2 TOP AND REAR COVER SWITCHES .........................................3-29
3.14 REGISTRATION....................................................................................3-30
3.14.1 LEADING EDGE REGISTRATION ...............................................3-30
3.14.2 SIDE-TO-SIDE REGISTRATION..................................................3-31
TROUBLESHOOTING
4. TROUBLESHOOTING ................................................................. 4-1
4.1 SERVICE CALL.........................................................................................4-1
4.1.1 SUMMARY .......................................................................................4-1
G108 ii SM