Black Horizontal Stripes; White Vertical Streaks - Brother DCP-1510 Service Manual

4.4.11 Black horizontal stripes

Step
Dirt on electrodes of the drum unit
1 and those of the machine
Dirt on electrodes of the toner
2 cartridge and those of the machine
Attachment failure of the FG
3 harness or FG plate (not grounded
correctly)
4 Scratch or dirt on the heat unit
High voltage power supply PCB
5
failure
6 Main PCB failure
Image defects which appear periodically may be caused by failure of rollers. Refer to the
table below and determine the responsible roller based on the pitch at which defects appear
on the image.
Developer roller
Transfer roller
Exposure drum
Heat roller
Pressure roller

4.4.12 White vertical streaks

Step
1 Laser unit failure
<User Check>
- Clean the inside of the machine and the corona wire of the drum
unit.
- This problem may disappear after printing multiple sheets of paper.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Cause
Part name
<User Check>
- Check that there is no dust in the gap between the toner cartridge
and the drum unit.
- Replace the toner cartridge with a new one.
- Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
- Check that the paper is not damp.
- Leave the machine for a while before printing again.
- Replace the drum unit with a new one.
Cause
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 1-8.)
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
or Fig. 1-8.)
Retighten the screws to secure the FG
harness or FG plate.
Replace the fuser unit.
Replace the high voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Pitch at which defects
Diameter
appear in the image
ø 13 mm
ø 13 mm
ø 24 mm
ø 25 mm
ø 25 mm
Replace the laser unit.
1-53
Remedy
Fig. 1-7
Fig. 1-7
26.0 mm
38.0 mm
75.4 mm
78.5 mm
78.5 mm
Remedy
Confidential
or