Brother HLL3290CDW Service Manual page 162

■
Light vertical streaks and bands on one color image
<User Check>
• Clean the corona wire of the drum unit.
• Check that there is no dust on the toner cartridge.
• Refer to <How to clean the drum unit>
cotton applicator.
• Wipe the LED ASSY with a soft, lint-free cloth. (Refer to
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step
Dirty charge electrodes
1
2 LED ASSY failure
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White horizontal stripes on one color image
<User Check>
• This problem may disappear after printing multiple sheets of paper.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step
Dirty charge electrodes
1
Scratch or dirt on the fuser
2
unit
High-voltage power supply
3
PCB failure
to remove the dirt from the exposure drum using a
Cause
Clean the electrodes of the drum unit and
those of the machine. (Refer to
78)
Replace the appropriate LED ASSY.
Cause
Clean the electrodes of the drum unit and
those of the machine. (Refer to
78)
Replace the fuser unit.
Replace the high-voltage power supply PCB.
2-126
Fig. 2-15 (P2-118).)
Remedy
and Fig. 2-11 (P2-78).)
Remedy
and Fig. 2-11 (P2-78).)
Fig. 2-12 (P2-
Fig. 2-12 (P2-
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