Troubleshooting For Other Problems; Machine Does Not Turn On Or Led Does Not Light; Top Cover Is Open; Unusual Noise Is Coming From The Machine - Brother HL-1110 Service Manual

4.7

Troubleshooting for Other Problems

4.7.1 Machine does not turn ON or LED does not light

<User Check>
- Press and hold the
- Plug the AC cord into a socket.
Step
Connection failure of the high
1
voltage PCB harness
Connection failure of the low
2
voltage PCB harness
LED failure
3
Low voltage power supply PCB
4
failure
5 Main PCB failure

4.7.2 Top cover is open

Open top cover was detected.
<User Check>
- Check that the top cover is closed.
Step
Connection failure of the laser unit
1
flat cable
Connection failure of the eject
2
sensor PCB harness
Connection failure of the paper
3 feed/paper printing position sensor
PCB harness
Eject actuator caught in sections of
4
the machine
The rib inside the top cover (which
5 presses the eject actuator or laser
shutter arm) is broken.
6 Eject sensor failure
Paper feed/paper printing position
7
sensor PCB failure
Faulty laser shutter arm of the laser
8
unit
9 Main PCB failure

4.7.3 Unusual noise is coming from the machine

Step
Possible cause differs depending
on the location. Identify the location
1
with the problem first.
2 Insufficient grease on parts
3 Bent or defective part
button and check if the machine turns ON.
Cause
Reconnect the high voltage PCB harness.
Reconnect the low voltage PCB harness.
Replace the high voltage power supply PCB
ASSY.
Replace the low voltage power supply PCB
unit.
Replace the main PCB ASSY.
Cause
Reconnect the laser unit flat cable.
Reconnect the eject sensor PCB harness.
Reconnect the paper feed/paper printing
position sensor PCB harness.
Reattach the eject actuator.
Replace the top cover ASSY.
Replace the eject sensor PCB ASSY.
Replace the paper feed/paper printing
position sensor PCB ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
Cause
When the location with the problem is
identified, check if there is a foreign object
around that location (replace the parts
around the location if necessary).
Re-grease the parts.
Replace the part.
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Remedy
Remedy
Remedy
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