Ricoh G176 Service Manual page 14

3.3.3 BY-PASS TRAY UNIT .................................................................3-6
3.3.4 EXTERIOR COVERS ..................................................................3-6
3.4 LASER UNIT .........................................................................................3-7
3.4.1 CAUTION DECAL LOCATIONS ..................................................3-7
3.4.2 POLYGON MIRROR MOTOR .....................................................3-7
3.4.3 LASER SYNCHRONIZATION DETECTOR .................................3-8
3.4.4 LASER UNIT................................................................................3-9
3.4.5 LASER DIODE UNIT .................................................................3-10
3.4.6 LASER BEAM PITCH ADJUSTMENT .......................................3-10
3.5 TRANSFER ROLLER .........................................................................3-13
3.6 TONER END SENSOR.......................................................................3-14
3.7 FUSING ..............................................................................................3-15
3.7.1 FUSING UNIT ............................................................................3-15
3.7.2 HOT ROLLER AND FUSING LAMP ..........................................3-16
3.7.3 PRESSURE ROLLER ................................................................3-18
3.7.4 THERMISTOR AND THERMOSTAT .........................................3-18
3.7.5 HOT ROLLER STRIPPERS.......................................................3-19
3.8 PAPER FEED .....................................................................................3-20
3.8.1 PAPER FEED ROLLER .............................................................3-20
3.8.2 FRICTION PAD..........................................................................3-21
3.9 BY-PASS TRAY ..................................................................................3-22
3.10 PRINTER CONTROLLER BOARD ...................................................3-23
3.11 ENGINE BOARD...............................................................................3-24
3.12 MAIN MOTOR...................................................................................3-25
3.13 CLUTCHES.......................................................................................3-26
3.14 PSU, HVPS.......................................................................................3-27
3.15 COOLING FAN .................................................................................3-28
TROUBLESHOOTING
4. TROUBLESHOOTING .............................................................4-1
4.1 SERVICE CALL CONDITIONS .............................................................4-1
4.1.1 SUMMARY...................................................................................4-1
4.1.2 SC CODE DESCRIPTIONS.........................................................4-2
4.2 ERROR MESSAGES ..........................................................................4-18
4.3 GENERAL TROUBLESHOOTING ......................................................4-25
G176/G177/G176L ii SM