Brother HLL3290CDW Service Manual page 156

■
Faulty registration
Step
Registration rear actuator
1
coming off
2 Main PCB failure
■
Dark
<User Check>
Step
Dirt on the electrodes of the
1 drum unit and those of the
machine
Dirt on the electrodes of the
2 belt unit and those of the
machine
Dirt on the electrodes of the
3 high-voltage power supply
PCB
4 Density sensor failure
High-voltage power supply
5
PCB failure
6 Main PCB failure
<User Check>
• Check whether appropriate paper type is selected on the
driver.
• Install the latest main firmware.
Cause
• Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
• If a new toner cartridge has been detected, check that it was not
replaced with another toner cartridge.
• Execute density adjustment from the control panel.
• Clean the corona wire of the drum unit.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
• Replace the belt unit with a new one.
Cause
2-120
Remedy
Reattach the registration rear actuator.
Replace the main PCB.
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
78) and Fig. 2-12 (P2-78).)
Clean the electrodes of the belt unit and
those of the machine. (Refer to
78) and Fig. 2-16 (P2-119).)
Clean the electrodes of the high-voltage
power supply PCB.
Replace the registration mark sensor L PCB.
Replace the high-voltage power supply PCB.
Replace the main PCB.
Fig. 2-11 (P2-
Fig. 2-11 (P2-
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