Brother HLL3290CDW Service Manual page 168

■
Downward fogging of solid color
<User Check>
• Replace the toner cartridge with a new one.
Step
High-voltage power supply
1
PCB failure
2 Main PCB failure
■
Horizontal lines
Step
Dirty charge electrodes
1
Scratch or dirt on the fuser
2
unit
High-voltage power supply
3
PCB failure
Cause
Replace the high-voltage power supply PCB.
Replace the main PCB.
<User Check>
• This problem may disappear after printing multiple
sheets of paper.
• Refer to <How to clean the drum unit>
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.
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.
2-132
Remedy
Remedy
and Fig. 2-11 (P2-78).)
to remove the
Fig. 2-12 (P2-
Confidential