Troubleshooting Of The Fuser Unit; Fuser Unit Failure - Brother MFC-9130CW Service Manual

4.8

Troubleshooting of the Fuser Unit

4.8.1

Fuser unit failure

Step
1
2
3
4
5
6
7
Note:
- Turn the power OFF and then ON again. After the machine is left as it is for about 10
minutes, this problem may be resolved.
- If test print is performed in maintenance mode for service personnel, the machine may
recover from the error. However, note that if this operation is performed while the heater
has not cooled down, the fuser unit may melt.
Cause
Harness connection failure
between the connector of the
fuser unit and eject sensor
PCB
Harness connection failure
between the connector of the
fuser unit and low-voltage
power supply PCB
Harness connection failure of
the eject sensor PCB
Eject sensor PCB failure
Low-voltage power supply
PCB failure
Fuser unit failure
Main PCB failure
Check the harness connection between the
connector of the fuser unit and eject sensor
PCB, and reconnect it.
Check the harness connection between the
connector of the fuser unit and low-voltage
power supply PCB, and reconnect it.
Check the harness connection of the eject
sensor PCB and reconnect it.
Refer to "1.4.10 Operational check of sensors"
in Chapter 5 and check the operations of
sensors.
If sensor operation failure occurs, replace the
eject sensor PCB ASSY.
Replace the low-voltage power supply PCB
ASSY.
Replace the fuser unit.
Replace the main PCB ASSY.
2-109
Remedy
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