Brother HL-L5000D Service Manual page 132

 White spots
Step
Dirt on the paper dust cleaning
1
roller of the paper tray
2 Clogged filter
3 Scratch or dirt on the fuser unit
High-voltage power supply PCB
4
failure
Note:
• Image defects which appear periodically may be caused by failure of rollers. Refer to
the table below and determine the cause based on the diameter of the rollers or the
pitch at which defects appear on the image.
<Pitch appears in the image and rollers>
Part name
Develop roller
Exposure drum
Heat film in the fuser unit
Pressure roller in the fuser unit
 Single-colored dot or dirt
Step
Dirt on the paper dust cleaning
1
roller of the paper tray
2 Clogged filter
3 Scratch or dirt on the fuser unit
4 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY.
Note:
• Image defects which appear periodically may be caused by failure of rollers. Refer to
the table above and determine the cause based on the diameter of the rollers or the
pitch at which defects appear on the image.
<User Check>
- Check that the main fan is not clogged.
- Refer to <How to clean the drum unit>
exposure drum using a cotton applicator.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
<User Check>
- Check that the paper is not damp.
- Refer to <How to clean the drum unit>
exposure drum using a cotton applicator.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
2-106
to remove the dirt from the
Remedy
Refer to the Fig. 2-9
cleaning roller.
Clean the filter.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Pitch at which defects
appear in the image
45.5 mm
94.2 mm
104 mm
94 mm
to remove the dirt from the
Remedy
Refer to the Fig. 2-9
cleaning roller.
Clean the filter.
Replace the fuser unit.
to clean the paper dust
to clean the paper dust
Confidential