Brother HLL3290CDW Service Manual page 161

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Vertical streaks in a dark background
<User Check>
• Clean the corona wire of the drum unit.
• This problem may disappear after printing multiple sheets of paper.
• Refer to <How to clean the drum unit>
cotton applicator.
• Turn ON the power switch, and leave the machine for a while.
• 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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Horizontal stripes
<User Check>
• Clean the corona wire of the drum unit.
• This problem may disappear after printing multiple sheets of paper.
• Refer to
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step
Dirty charge electrodes
1
A ground wire or ground plate
installation failure (Grounding
2
is not performed correctly.)
3 Scratch or dirt on the fuser unit
High-voltage power supply
4
PCB failure
to remove the dirt from the exposure drum using a
Cause
<How to clean the drum unit>
exposure drum using a cotton applicator.
Cause
2-125
Fig. 2-15 (P2-118).)
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
78) and Fig. 2-11 (P2-78).)
Replace the appropriate LED ASSY.
to remove the dirt from the
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
78) and Fig. 2-11 (P2-78).)
Retighten the screws of each ground wire or
ground plate. Repair the bend of the tray
ground spring of the T1.
(Refer to Fig. 2-18 (P2-124).)
Replace the fuser unit.
Replace the high-voltage power supply PCB.
Fig. 2-12 (P2-
Fig. 2-12 (P2-
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