Vertical Streaks - Brother HL-5440D Service Manual

Dirt on the back of paper
Step
1 Dirt on paper feed system
2 Dirt on the fuser unit

Vertical streaks

Step
Dirt on paper feed system
1
Earth wires or earth plate attachment
2
failure (not grounded correctly)
3 Scratches or dirt on the heat unit
CAUTION:
• If the machine prints the same pattern continuously, especially a pattern including
vertical streaks, black vertical streaks may appear on the paper because the
electrostatic performance of the exposure drum has lowered temporarily.
<User Check>
- This problem may disappear after printing multiple
sheets of paper.
- Replace the toner cartridge with a new one.
Cause
Replace the fuser unit.
<User Check>
- Clean inside the machine and the corona wire of the
drum unit.
- Return the corona wire cleaning tab to the [
- This problem may disappear after printing multiple
sheets of paper.
- Refer to the User's Guide 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.
- Clean the eject pinch roller.
Cause
Replace the fuser unit.
Fig. 2-8
2-65
Remedy
Wipe off the dirt.
Remedy
Wipe off the dirt on the sections shown in
the illustration below.
Retighten the screws to secure the earth
wires or earth plate.
] position.
Confidential