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4.8 Troubleshooting for Fuser Unit Problems
4.8.1 Fuser unit failure
4.9 Troubleshooting for Laser Unit Problems
4.9.1 Laser unit failure
<User Check>
• Turn ON the power switch, then open the front cover and the back cover. Leave the machine
for a while to remove condensation.
Step Cause Remedy
1
Connection failure of the
center thermistor harness
Reconnect the center thermistor harness.
2
Connection failure of the side
thermistor harness
Reconnect the side thermistor harness.
3
Connection failure of the
heater harness
Reconnect the heater harness.
4
Connection failure of the eject
sensor PCB harness
Reconnect the eject sensor PCB harness.
5 Eject sensor PCB failure Replace the eject sensor PCB ASSY.
6
Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB
ASSY.
7 Fuser unit failure Replace the fuser unit.
8 Main PCB failure Replace the main PCB ASSY.
Note:
• Turn the power switch OFF and then ON again. Leave the machine for 15 minutes.
This problem may then be cleared.
• The machine may recover from the error, when the test printing of the maintenance mode
for service personnel is started. However, conducting this operation while the heater has
not yet cooled may cause the fuser unit to melt. Be careful.
Step Cause Remedy
1 Laser unit attachment failure Reattach the laser unit.
2
Connection failure of the laser
unit flat cable
Reconnect the laser unit flat cable.
3
Connection failure of the
polygon motor harness
Reconnect the polygon motor harness.
4 Laser unit failure Replace the laser unit.
5 Main PCB failure Replace the main PCB ASSY.
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