Brother MFC-L2700D - Troubleshooting for Fuser Unit Problems; Fuser Unit Failure; Troubleshooting for Laser Unit Problems; Laser Unit Failure

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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
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 flat cable
Reconnect the eject sensor PCB flat cable.
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.
<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
Wrong adjusted value of laser unit
entered
Refer to “1.4 Setting Serial Number and
Entering Adjusted Value of Laser Unit” in
Chapter 4, and enter the adjusted value of
the laser unit correctly.
2
Ground plate contact failure Retighten the screws to secure the laser unit
ground plate.
3
Laser unit attachment failure Reattach the laser unit.
4
Connection failure of the laser unit
flat cable
Reconnect the laser unit flat cable.
5
Laser unit failure Replace the laser unit.
6
Main PCB failure Replace the main PCB ASSY.