Brother HL-L9300CDW Service Manual page 120

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All one color
<User Check>
- Clean the corona wire of all four colors on the drum unit.
- Replace the drum unit with a new one.
Step
1 Dirt on the electrodes of the
main body and the drum unit
2 Dirt on the electrodes of the
main body and the toner
cartridge
3 Dirt on the electrodes of the
main body and the belt unit
4 Laser unit flat cable failure
5 Dirt on the electrodes of the
high-voltage power supply
PCB
6 High-voltage power supply
PCB failure
7 Laser unit failure
8 Main PCB failure
Cause
Clean the electrodes of the main body and
the drum unit.
(Refer to
Clean the electrodes of the main body and
the toner cartridge.
(Refer to
Clean the electrodes of the main body and
the belt unit.
(Refer to
Replace the laser unit flat cable.
Clean the electrodes of the high-voltage
power supply PCB.
Replace the high-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
2-100
Remedy
Fig. 2-5 (P2-57), Fig. 2-6
Fig. 2-5 (P2-57), Fig. 2-8
Fig. 2-5 (P2-57), Fig. 2-9
(P2-57).)
(P2-96).)
(P2-97).)
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