Brother DCP-L8400CDN Service Manual page 138

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White spots on one color image
< User Check >
- Check if the fuser fan and/or blower are not blocked.
- Refer to the User's guide and remove the dirt on the exposure drum using a cotton swab.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
- Replace the belt unit with a new one.
Step
1
Paper dust is accumulated
2
Dirt on the exposure drum
3
Toner filter is clogged
4
Scratch and dirt on fuser unit
5
High-voltage power supply
PCB failure
Cause
Paper tray
Rib
Paper dust
Fig. 2-14
2-108
Remedy
Referring to the figure below, remove paper
dust attached on the paper dust cleaning
roller.
Perform drum cleaning.
(Refer to "2.2 Drum Cleaning" in Chapter
Clean the toner filter.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Paper dust cleaning roller cover
Paper dust cleaning roller
5.)
Rib
Confidential