Brother HL-L8250CDN Service Manual page 121

■
Light vertical steaks and bands on one color image
<User Check>
- Clean the corona wire of all four colors on the drum unit.
- Check if dust adheres to the area of the toner cartridge corresponding to the location where
the white vertical streak appears.
- Refer to the User's guide and remove the dirt on the exposure drum using a cotton swab.
- Wipe the scanner windows of the laser unit with a soft, lint-free cloth.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step
1 Dirt on charged electrode
2 Dirt on the exposure drum
3 Laser unit failure
■
White horizontal stripes on one color image
<User Check>
- This symptom might stop occurring after making several prints.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step
1 Dirt on charged electrode
2 Dirt on the exposure drum
3 Scratch and dirt on fuser unit
4 High-voltage power supply
PCB failure
Cause
Clean the electrodes of the drum unit and the
main body.
(Refer to
Perform drum cleaning.
(Refer to
Replace the laser unit.
Cause
Clean the electrodes of the drum unit and the
main body.
(Refer to
Perform drum cleaning.
(Refer to
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
2-98
Remedy
Fig. 2-6 (P2-55), Fig. 2-5
"2.2 Drum Cleaning" in Chapter
Remedy
Fig. 2-6 (P2-55), Fig. 2-5
"2.2 Drum Cleaning" in Chapter
(P2-55).)
5.)
(P2-55).)
5.)
Confidential