Brother HL HL-1060 Service Manual page 72

I-4 All black
Possible cause Step
Corona failure
Harness
connection
H.V. power
supply PCB
Ditto
Main PCB
Driver PCB
Check
1 Is the corona wire of the drum
unit broken?
2 Are the electric terminal springs
in the printer body and the
electrode on the bottom face of
the drum unit dirty?
3 Is the scanner unit connected
with the driver PCB correctly?
4 Is the problem solved after H.V.
power supply PCB replaced?
5 Perform the same check as in
step 3.
6 Is the problem solved after
main PCB replaced?
7 Is the problem solved after
driver PCB replaced?
CHAPTER IV -8
Result Remedy
Yes Replace the drum
unit.
Yes Clean the terminals in
the printer and on the
drum.
Yes Check the harness
connection between
the scanner unit and
the driver PCB.
Yes Replace the H.V.
power supply PCB.
No Replace the panel
sensor PCB.
Yes Replace the main
PCB.
Yes Replace the driver
PCB.
HV.GND
contacts
(Fig.4-5)
h