Brother HL-L8250CDN Service Manual page 119

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Vertical streaks
Step
1 Dirt in the paper feed system
2 Installation failure of each FG
wire and/or FG plate
(Grounding is not performed
correctly.)
3 Dirt on the exposure drum
4 Dirt on the cleaner pinch roller
of the fuser cover
5 Dirt on the fuser unit
6 Laser unit failure
<User Check>
- Clean the corona wire of all four colors on the drum
unit.
- Return the cleaning tab of the corona wire to the
position.
- This symptom might stop occurring after making
several prints.
- 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.
- Wipe the scanner windows of the laser unit with a soft,
lint-free cloth.
Cause
Wipe dirt off.
Retighten the screws of each FG wire and/or
FG plate. Repair the bend of the tray ground
spring of the paper tray.
(See the figure below.)
Perform drum cleaning.
(Refer to
Replace the cleaner pinch roller S ASSY.
Replace the fuser unit.
Replace the laser unit.
Fig. 2-11
2-96
Remedy
"2.2 Drum Cleaning" in Chapter
Tray ground spring
Paper tray
<Bottom of paper tray>
5.)
Confidential