Brother HL HL-1060 Service Manual page 70

I-2 Dark
Possible cause Step
Density dial
Corona failure
(soiled wire)
Corona failure
(contact failure)
Drum unit failure
H.V. power
supply PCB
Main PCB
Driver PCB
Check
1 Is the density dial at the center
click position?
2 Is the corona wire dirty?
3 Are the corona electrodes
between the printer body and
drum unit dirty?
4 Is the problem solved when the
drum unit is replaced?
5 Are there any disconnected
connectors?
6 Are there any disconnected
connectors?
7 Are there any disconnected
connectors?
CHAPTER IV -6
Result Remedy
No Set it to the center
click position or
reasonable position.
Yes Clean the corona wire
by using the wire
cleaner.
No Clean both electrodes.
Yes Replace the drum unit
with a new one.
No Replace the H.V.
power supply.
No Replace the main
PCB.
No Replace the driver
PCB.
HV.GND
contacts
(Fig.4-5)
j
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