Poor Fixing; Completely Blank - Brother HL-2250DN Service Manual

4.2.4 Poor fixing

Step
1 Fuser unit failure
2 Laser unit failure
Low voltage power supply PCB
3
ASSY failure
4 Main PCB failure

4.2.5 Completely blank

Step
Dirt on the electrodes of the drum
1
unit and the printer body
Scanner harness of the laser unit
2
connection failure
3 Laser unit failure
High voltage power supply PCB
4
ASSY failure
5 Main PCB failure
User Check
• Check the printer's environment. High temperature and high
humidity or low temperature and low humidity conditions can cause
this problem.
• Clean the corona wire of drum unit.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
• Return the green envelope levers to the home position. (Refer to
Fig. 2-6.)
Cause
User Check
• Check the printer's environment. High temperature and high
humidity or low temperature and low humidity conditions can cause
this problem.
• Clean the corona wire of drum unit.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
• Remove the elastic band from the drum unit.
Cause
2-32
Remedy
Replace the fuser unit.
Replace the laser unit.
Replace the low voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Remedy
Clean the electrodes of the drum unit and
printer body. (Refer to Fig. 2-8, Fig.
Reconnect the scanner harness of the
laser unit.
Replace the laser unit.
Replace the high voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
2-9.)
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