Brother DCP-L5500D, Service Manual

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2-103
Confidential

White spots
<Pitch appears in the image and rollers >

Single-colored dot or dirt
<User Check>
• Check that the main fan is not clogged.
• Refer to
< How to clean the drum unit> 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 paper dust cleaning
roller of the paper tray Refer to the Fig. 2-10 to clean the paper
dust cleaning roller.
2 Clogged filter Clean the filter.
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.
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.
Part name
Pitch at which defects
appear in the image
Develop roller 45.5 mm
Exposure drum 94.2 mm
Heat film in the fuser unit 104 mm
Pressure roller in the fuser unit 94 mm
<User Check>
• Check that the paper is not damp.
• Refer to
< How to clean the drum unit> 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 paper dust cleaning
roller of the paper tray Refer to the Fig. 2-10 to clean the paper
dust cleaning roller.
2 Clogged filter Clean the filter.
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.
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.