Brother HL-L2300D Service Manual page 76

 Dark
Step
Dirt on the electrodes of the drum
1 unit and those of the machine
Dirt on the electrodes of the toner
2 cartridge and those of the machine
Wrong adjusted value of the laser
unit entered
3
Dirt on the electrodes of the high-
4
voltage power supply PCB
Fuser unit failure
5
High-voltage power supply PCB
6
failure
Main PCB failure
7
Laser unit failure
8
 Poor fixing
Step
Dirt on the electrodes of the toner
1 cartridge and those of the machine
Fuser unit failure
2
High-voltage power supply PCB
3
failure
Low-voltage power supply PCB
4
failure
Laser unit failure
5
Main PCB failure
6
<User Check>
- Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
- If a new toner cartridge has been detected, check that it was not
replaced with another toner cartridge.
- Clean the corona wire of the drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
<User Check>
- Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
- Clean the corona wire of the drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
2-58
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 2-6.)
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
and Fig. 2-6.)
Refer to "1.3 Setting Serial Number and
Entering Adjusted Value of Laser Unit" in
Chapter 4, and enter the adjusted value of
the laser unit correctly.
Clean the electrodes of the machine.
(Refer to Fig. 2-6.)
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Replace the laser unit.
Remedy
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
and Fig. 2-6.)
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Replace the low-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
Fig. 2-5 and
Fig. 2-5
Fig. 2-5
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