iv
6.2 PHOTOCONDUCTOR UNIT (PCU).......................................................... 6-6
6.2.1 PCU ................................................................................................. 6-6
6.3 TRANSFER UNIT ..................................................................................... 6-7
6.3.1 TRANSFER ROLLER UNIT ............................................................. 6-7
6.4 ID SENSOR .............................................................................................. 6-8
6.5 PAPER EXIT ........................................................................................ 6-9
6.5.1 PAPER EXIT AND OVERFLOW SENSORS ................................... 6-9
6.6 PAPER FEED AND REGISTRATION..................................................... 6-10
6.6.1 PAPER LIFT MOTORS.................................................................. 6-10
6.6.2 REGISTRATION CLUTCH............................................................. 6-11
6.6.3 PAPER FEED CLUTCHES ............................................................ 6-11
6.6.4 UPPER PAPER TRANSPORT CLUTCH ....................................... 6-12
6.6.5 LOWER PAPER TRANSPORT CLUTCH ...................................... 6-12
6.6.6 REGISTRATION SENSOR ............................................................ 6-13
6.6.7 UPPER RELAY SENSOR.............................................................. 6-14
6.6.8 LOWER RELAY SENSOR ............................................................. 6-15
6.6.9 UPPER PAPER SIZE SENSOR .................................................... 6-16
6.6.10 LOWER PAPER SIZE SENSOR/SPECIAL PAPER SENSOR .... 6-17
6.6.11 FEED ROLLERS.......................................................................... 6-18
6.6.12 PAPER END SENSOR (1ST AND 2ND PAPER FEED TRAYS) . 6-19
6.7 FUSING .................................................................................................. 6-20
6.7.1 FUSING UNIT ................................................................................ 6-20
6.7.2 THERMISTOR ............................................................................... 6-20
6.7.3 THERMOFUSE.............................................................................. 6-21
6.7.4 HOT ROLLER AND FUSING LAMP .............................................. 6-22
6.7.5 PRESSURE ROLLER/CLEANING ROLLER ................................. 6-23
6.8 PCBS AND MOTORS............................................................................. 6-24
6.8.1 PSU ............................................................................................... 6-24
6.8.2 ENGINE BOARD ........................................................................... 6-25
6.8.3 PRINTER CONTROLLER / NIB..................................................... 6-26
6.8.4 HIGH VOLTAGE SUPPLY BOARD ............................................... 6-27
6.8.5 MAIN MOTOR................................................................................ 6-27
6.8.6 TONER BOTTLE MOTOR ............................................................. 6-28
7. TROUBLESHOOTING................................................................. 7-1
7.1 SERVICE CALL CONDITIONS................................................................. 7-1
7.1.1 PRINTER ENGINE SC CODES SUMMARY.................................... 7-1
7.1.2 PRINTER ENGINE SC CODES....................................................... 7-2
7.2 PRINTER CONTROLLER ERROR......................................................... 7-11
7.2.1 ERROR CODES ............................................................................ 7-11
7.3 CONTROLLER LED DISPLAY ............................................................... 7-12
7.3.1 LOCATION..................................................................................... 7-12
7.3.2 FATAL ERROR.............................................................................. 7-12
7.4 ELECTRICAL COMPONENT DEFECTS................................................ 7-15
7.4.1 SENSORS ..................................................................................... 7-15
7.4.2 SWITCHES .................................................................................... 7-17
7.5 BLOWN FUSE CONDITIONS................................................................. 7-18
