White Spots On One Color Image - Brother DCP-9055CDN Service Manual

■ White spots on one color image

<User Check>
- Toner may be empty. Replace the toner cartridge with a new one.
- Refer to the User's guide and remove the dirt on the exposure drum using a cotton swab.
- The drum unit may be damaged. Replace the drum unit with a new one.
- The belt unit may be damaged. Replace the belt unit with a new one.
Step
1 Dirt on the pinch roller of the
paper tray
2 Exposure drum dirty
3 High-voltage power supply
PCB failure
4 Toner/New sensor PCB
failure
■ Pinch roller cleaning procedure
Pull out both sides of the pinch roller cover from the ribs to remove the pinch roller cover.
Clean the pinch roller with a brush as rotating the pinch roller in the arrow direction with
your fingers.
Remove paper dust accumulated in the paper tray by turning over the paper tray.
Cause
Paper tray
Rib
Paper dust
Fig. 2-18
2-120
Remedy
Refer to the figure below and clean the pinch
roller.
Refer to "2.5 Drum Cleaning" in Chapter 5
and perform drum cleaning.
Replace the high-voltage power supply PCB
ASSY.
Replace the Toner/New sensor PCB ASSY.
Pinch roller cover
Pinch roller
Rib
Confidential