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4.5 Troubleshooting for Fuser Unit Problems
4.5.1 Fuser unit failure
4.6 Troubleshooting for Laser Unit Problems
4.6.1 Laser unit failure
Step Cause Remedy
1
Connection failure of the center
thermistor harness of the fuser unit
Reconnect the center thermistor harness of
the fuser unit.
2
Connection failure of the low
voltage PCB harness
Reconnect the low voltage PCB harness.
3
Connection failure of the heater
harness of the fuser unit
Reconnect the heater harness of the fuser
unit.
4
Low voltage power supply PCB
failure
Replace the low voltage power supply PCB
unit.
5 Fuser unit failure Replace the fuser unit.
6 Main PCB failure Replace the main PCB ASSY.
Note:
• Turn the power switch OFF and then back ON again. Leave the machine for
approximately 15 minutes to cool the heater. This problem may have then been solved.
• Errors of the fuser unit can be reset by the following operation.
However, note that if this operation is performed while the heater has not cooled down,
the fuser unit may melt.
<Operating Procedure>
(1) Check that the power switch is turned OFF. Press and hold the button and check
that the Ready and Error LEDs are lit. Then open the top cover and check that the
Error LED goes out and only the Ready LED is lit.
(2) Take out the drum unit and check that the Error LED is lit. Check that the Ready and
Error LEDs are lit and release the button. Check that all LEDs go out.
(3) Set the drum unit and close the top cover.
(4) Press the button once. Check that the Error LED is lit.
(5) Press the button once to start the maintenance printing.
<User Check>
- Turn ON the power switch, then open the top cover. Leave the machine for a while to
remove condensation.
Step Cause Remedy
1
Connection failure of the laser unit
flat cable
Reconnect the laser unit flat cable.
2
Connection failure of the polygon
motor harness
Reconnect the polygon motor harness.
3 Laser unit failure Replace the laser unit.
4 Main PCB failure Replace the main PCB ASSY.
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