Ricoh G092 Service Manual page 14

3.4 EXTERIOR COVERS ..........................................................................................3-3
3.4.1 FRONT DOOR WITH TRANSFER ROLLER UNIT ..............................3-3
3.4.2 TRANSFER ROLLER ASSEMBLY.........................................................3-4
3.4.3 RIGHT COVER...........................................................................................3-4
3.4.4 REAR COVER ............................................................................................3-5
3.4.5 LEFT COVER .............................................................................................3-5
3.4.6 TOP COVER AND LCD PANEL ..............................................................3-6
3.5 ECB AND DRIVE UNITS ....................................................................................3-7
3.5.1 ECB (ENGINE CONTROL BOARD) A ND TEMPERATURE/
HUMIDITY SENSOR BOARDS..............................................................3-7
3.5.2 SUB FUSING-FAN AND SUB FUSING-FAN DUCT ............................3-8
3.5.3 TONER CARTRID GE HOLDER..............................................................3-9
3.5.4 TONER CARTRID GE DRIVE UNIT ......................................................3-10
3.5.5 PAPER PICKUP MOTOR AND MOTOR BRACKET .........................3-10
3.5.6 MAIN DRIVE UNIT ...................................................................................3-11
3.5.7 BIAS UNIT .................................................................................................3-17
3.5.8 POWER SUPPLY FAN MOTOR AND PSU FAN MOTOR DUCT ...3-17
3.6 LASER SCANNING UNIT.................................................................................3-18
3.6.1 CAUTION DECAL LOCATIONS ............................................................3-18
3.6.2 LASER SCANNIN G UNIT .......................................................................3-19
3.7 PAPER FEED.....................................................................................................3-19
3.7.1 PAPER EXIT .............................................................................................3-19
3.7.2 DISASSEMBLY OF PAPER EXIT SUB ASSEMBLY.........................3-22
3.8 PAPER FEED UNIT...........................................................................................3-22
3.8.2 PAPER FEED UNIT DISASSEMBLY ...................................................3-24
3.9 IH (INDUCTIVE HEATER) UNIT .....................................................................3-27
3.10 ELECTRICAL COMPONENTS ......................................................................3-28
3.10.1 POWER SUPPLY UNIT ........................................................................3-28
3.10.2 POWER SUPPLY UNIT DISASSEMBLY ..........................................3-29
3.10.3 MAIN CONTROL BOARD ....................................................................3-30
3.10.4 NVRAM/EEPROM REPLACEMENT PROCEDURES.....................3-30
EEPROM on the ECB ..................................................................................3-30
NVRAM on the Controller............................................................................3-31
EEPROM on the ECB and the NVRAM on the Controller .....................3-31
3.10.5 MAIN CONTROL BOARD SHIELD COVERS ...................................3-32
3.10.6 HIGH VOLTAGE BOARD AND REGISTRATION SENSOR
BOARD ....................................................................................................3-33
3.11 TRANSFER BELT TENSION UNIT ..............................................................3-34
3.11.1 TRANSFER BELT TENSION UNIT REMOVAL................................3-34
3.11.2 CHANGER SOLENOID AND CAM RATCHET SOLENOID ...........3-35
3.12 PCU HOLDER..................................................................................................3-37
3.13 FUSING FAN MOTOR....................................................................................3-39
3.14 SENSORS.........................................................................................................3-39
3.14.1 FRONT AND RIGHT COVER OPEN DETECTION SWITCHES ...3-39
3.14.2 BY-PASS TRAY HOME POSITION SENSOR AND BY-PASS
TRAY PAPER DETECTION SENSOR BOARDS ............................3-40
3.14.3 WASTE TONER CARTRIDGE FULL SENSOR ...............................3-40
3.15 STANDARD PAPER CASSETTE .................................................................3-41
G081/G092 ii SM