Troubleshooting For Fuser Unit Problems; Fuser Unit Failure; Troubleshooting For Laser Unit Problems; Laser Unit Failure - Brother HL-1110 Service Manual

4.5

Troubleshooting for Fuser Unit Problems

4.5.1 Fuser unit failure

Step
Connection failure of the center
1
thermistor harness of the fuser unit
Connection failure of the low
2
voltage PCB harness
Connection failure of the heater
3
harness of the fuser unit
Low voltage power supply PCB
4
failure
5 Fuser unit failure
6 Main PCB failure
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
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
(3) Set the drum unit and close the top cover.
(4) Press the
(5) Press the
4.6

Troubleshooting for Laser Unit Problems

4.6.1 Laser unit failure

<User Check>
- Turn ON the power switch, then open the top cover. Leave the machine for a while to
remove condensation.
Step
Connection failure of the laser unit
1
flat cable
Connection failure of the polygon
2
motor harness
3 Laser unit failure
4 Main PCB failure
Cause
button once. Check that the Error LED is lit.
button once to start the maintenance printing.
Cause
1-32
Remedy
Reconnect the center thermistor harness of
the fuser unit.
Reconnect the low voltage PCB harness.
Reconnect the heater harness of the fuser
unit.
Replace the low voltage power supply PCB
unit.
Replace the fuser unit.
Replace the main PCB ASSY.
button. Check that all LEDs go out.
Remedy
Reconnect the laser unit flat cable.
Reconnect the polygon motor harness.
Replace the laser unit.
Replace the main PCB ASSY.
button and check
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