Horizontal Stripes; White Vertical Streaks On One Color Image - Brother DCP-9055CDN Service Manual

■ Horizontal stripes

<User Check>
Step
1 Dirt on charged electrode
2 Bend of tray ground spring
3 Toner attached on the
develop roller
4 Scratch on the heat roller
5 High-voltage power supply
PCB failure

■ White vertical streaks on one color image

<User Check>
- Check if there is no dust in the gap between the toner cartridge and drum frame.
- Wipe the scanner windows of the laser unit with a soft, lint-free cloth.
(Refer to Fig. 2-16
- Refer to the User's guide and remove the dirt on the exposure drum using a cotton swab.
- Replace the toner cartridge with a new one.
- Check the machine's environment. High temperature and high humidity or low temperature
and low humidity conditions can cause this problem.
- Damp (wet) paper might be used. Try to change to freshly unpacked paper.
- Replace the drum unit with a new one.
Step
1 Condensation
2 Exposure drum dirty
3 Laser unit failure
- Clean the inside of the machine and the corona wire in the drum unit.
- Replace the drum unit with a new one.
Cause
(P2-111))
Cause
2-118
Remedy
Clean the electrodes of the drum unit and
main body. (Refer to Fig. 2-10 (P2-62)
Fig. 2-13 (P2-63))
Replace the paper tray. (Refer to
(P2-117))
This problem will disappear by printing
approximate 10 pages. If the same problem
occurs, replace the toner cartridge.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Remedy
Try to print several pages or leave the
machine 2 hours to allow it to reach room
temperature.
Refer to "2.5 Drum Cleaning" in Chapter 5
and perform drum cleaning.
Replace the laser unit.
and
Fig. 2-17
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