Fuser Unit Problems; Fuser Unit Failure; Laser Unit Problems; Laser Unit Failure - Brother HL-2250DN Service Manual

4.6

Fuser Unit Problems

4.6.1 Fuser Unit failure

Step
Harness connection failure between
1 fuser unit connector and paper eject
sensor PCB ASSY
Harness connection failure between
2 fuser unit connector and low voltage
power supply PCB ASSY
Harness connection failure between
3 paper eject sensor PCB ASSY and
main PCB.
Paper eject sensor PCB ASSY
4
failure
Low voltage power supply PCB
5
ASSY failure
6 Main PCB failure
7 Fuser unit failure
CAUTION :
• Turn off the power switch once, and after checking that the fuser unit sufficiently cools
down, turn on the power switch again and leave the printer for ten minutes. Then, this
problem may be cleared.
Turn the power on while pressing the [Go] button, when the front cover is open. After
Toner, Drum and Error LEDs light up, release the [Go] button. Check that all LEDs go
off, press the [Go] button once, and after all LEDs light up again, press the [Go] button
once again. Then, this problem may be cleared. However, be careful because the fuser
unit melts if the fuser unit does not sufficiently cool down.
4.7

Laser Unit Problems

4.7.1 Laser Unit failure

Step
Harness connection failure of laser
1
unit
2 Main PCB failure
3 Laser unit failure
Cause
Cause
2-44
Remedy
Check the harness connection between
fuser unit connector and paper eject
sensor PCB ASSY, and reconnect it.
Check the harness connection between
fuser unit connector and low voltage power
supply PCB ASSY, and reconnect it.
Check the harness connection between
paper eject sensor PCB ASSY and main
PCB, and reconnect it.
Replace the paper eject sensor PCB
ASSY.
Replace the low voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Replace the fuser unit.
Remedy
Check the harness connection of the
laser unit, and reconnect them.
Replace the main PCB ASSY.
Replace the laser unit.
Confidential