Brother HLL3290CDW Service Manual page 159

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Dirt on back side of paper
Step
1 Dirt in the paper feed system
Dirt on the electrodes of the
2 belt unit and those of the
machine
Dirt on the electrodes of the
3 waste toner box and those of
the machine
4 Dirt on the fuser unit
High-voltage power supply
5
PCB failure
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Electrodes location of waste toner box
<User Check>
• This problem may disappear after printing multiple
sheets of paper.
• Replace the drum unit with a new one.
• Replace the belt unit.
• Replace the waste toner box.
Cause
Wipe dirt off.
Clean the electrodes of the belt unit and
those of the machine. (Refer to
78)
Clean the electrodes of the waste toner box
and those of the machine. (Refer to
(P2-78)
Replace the fuser unit.
Replace the high-voltage power supply PCB.
Fig. 2-17
2-123
Remedy
and Fig. 2-16 (P2-119).)
and below.)
Fig. 2-11 (P2-
Fig. 2-11
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