Brother DCP-L2500D, Service Manual

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2-72
Confidential

Black vertical streaks on a light background
 Horizontal streaks
<User Check>
- Clean the corona wire of the drum unit.
- This problem may disappear after printing multiple sheets of paper.
- Refer to the User's Guide to remove the dirt from the exposure drum
using a cotton applicator.
- Turn ON the power switch, and leave the machine for a while
(condensation).
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step Cause Remedy
1
Dirt on the charge electrodes Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 2-8 and
Fig. 2-9 .)
2
Laser unit failure Replace the laser unit.
<User Check>
- Clean the corona wire of the drum unit.
- This problem may disappear after printing multiple sheets of paper.
- Refer to the User's Guide to remove the dirt from the exposure drum
using a cotton applicator.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step Cause Remedy
1
Dirt on the charge electrodes Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 2-8 and
Fig. 2-9 .)
2
FG harnesses or FG plate
attachment failure (not grounded
correctly) Retighten the screws to secure the FG
harnesses or FG plate.
Fix the bent tray ground spring of the paper
tray. (Refer to
Fig. 2-13 .)
3
Scratch or dirt on the fuser unit Replace the fuser unit.
4
High-voltage power supply PCB
failure Replace the high-voltage power supply PCB
ASSY.