ii
3.4 AIO CARTRIDGE ................................................................................... 3-14
3.4.1 REPLACING THE AIO CARTRIDGE............................................. 3-14
3.4.2 REPLACING THE TRANSFER ROLLER (PART OF THE FUSING
MAINTENANCE KIT) ..................................................................... 3-15
3.4.3 REPLACING THE POWER PACK................................................. 3-16
3.5 PAPER FEED AND REGISTRATION..................................................... 3-17
3.5.1 REPLACING THE PAPER FEED ROLLER ................................... 3-17
3.5.2 REPLACING THE REGISTRATION ROLLER ............................... 3-18
3.5.3 ADJUSTING THE PRINTING TOP MARGIN................................. 3-19
3.6 SENSORS .............................................................................................. 3-20
3.6.1 REPLACING THE ADF/MDF SENSORS AND SWITCHES .......... 3-20
3.6.2 REPLACING THE PAPER-END LED BOARD AND PAPER SIZE
SENSOR SWITCH................................................................................... 3-22
3.6.3 REPLACING THE PAPER NEAR END SENSOR ......................... 3-23
3.6.4 REPLACING THE UPPER LIMIT AND PAPER END SENSORS .. 3-23
3.6.5 REPLACING THE AIO CARTRIDGE SENSOR............................. 3-24
3.6.6 REPLACING THE PAPER EXIT SENSOR .................................... 3-25
3.6.7 REPLACING THE TONER END SENSOR .................................... 3-26
3.6.8 REPLACING THE REGISTRATION SENSOR .............................. 3-27
3.7 FUSING UNIT......................................................................................... 3-28
3.7.1 REPLACING THE FUSING UNIT (PART OF THE FUSING
MAINTENANCE KIT) ..................................................................... 3-28
3.7.2 DISASSEMBLING THE FUSING UNIT.......................................... 3-29
3.7.3 REPLACING THE PRESSURE ROLLER ...................................... 3-30
3.7.4 REPLACING THE HOT ROLLER, FUSING LAMP, AND
THERMOFUSE.............................................................................. 3-31
3.7.5 REPLACING THE THERMISTOR ................................................. 3-32
3.7.6 REPLACING THE HOT ROLLER STRIPPERS ............................. 3-33
3.8 PCBS ...................................................................................................... 3-34
3.8.1 REPLACING THE PSU.................................................................. 3-34
3.8.2 REPLACING THE OPIF/NCU/FCU................................................ 3-35
1. OPIF board ...................................................................................... 3-35
2. FCU and MBU boards...................................................................... 3-36
3. NCU board ....................................................................................... 3-37
3.8.3 REPLACING THE LCD CONTROLLER AND LCD BOARD .......... 3-38
3.8.4 REPLACING THE POWER PACK................................................. 3-39
3.8.5 REPLACING THE COOLING FAN ................................................ 3-40
3.9 BYPASS FEEDER UNIT......................................................................... 3-41
3.9.1 DISASSEMBLING THE BYPASS FEEDER UNITS ....................... 3-41
3.9.2 REPLACING THE CLUTCH AND PAPER FEED ROLLER ........... 3-42
3.9.3 REPLACING THE PAPER SIZE DETECTION SWITCH ............... 3-43
3.9.4 REPLACING THE CONNECTOR AND PAPER END SENSOR.... 3-44
3.10 DATA OR FIRMWARE DOWNLOAD/UPLOAD.................................... 3-45
3.10.1 DATA COPY BETWEEN THE IC CARD AND MACHINE............ 3-46
4. TROUBLESHOOTING................................................................. 4-1
4.1 COPY QUALITY TROUBLESHOOTING .................................................. 4-1
4.1.1 BLANK COPIES............................................................................... 4-2
4.1.2 BLACK COPIES............................................................................... 4-2
