Brother HL-1040 - Manual (Page 77)

IV-10
I-6 Black and blurred vertical streaks
Possible cause Step Check Result Remedy HV.GND
contacts
(Fig.4-5)
Corona failure 1 Is the corona wire dirty? Yes Clean the corona
wire with the wire
cleaner.
➇
Corona failure 2 Is the vertical block streak
about 10mm wide?
Is the corona wire cleaner not
in its home position? Yes Return the wire
cleaner to its home
position.
Dirt in the paper
feed system 3 Is the paper tray or feed
system on the drum unit soiled
with toner? Yes Clean the toner off.
Scratch on the
drum 4 Is the drum surface scratched? Yes Replace the drum
unit.
Cleaning failure 5 Is the drum surface dirty with
toner in streaks? Yes Replace the drum
unit.
Scratch on the
heat roller 6 Is the surface of the heat roller
scratched? Yes Replace the fixing
unit.
Note:
If you print the same pattern continuously, the drum will be worn and black vertical
streaks will appear on the paper.
I-7 Black and blurred horizontal stripes
Possible cause Step Check Result Remedy
Scratch on the
drum 1 Are the horizontal stripes at
94mm (OPC drum) intervals? Yes Replace the drum unit.
Toner stuck on
the developer
roller 2 Are the horizontal stripes at
25mm (developer roller)
intervals? Yes Print several sheet and see
what happens.
The problem will disappear
after a while. If not, replace the
drum unit.
Scratch on the
fixing roller 3 Are the horizontal streaks at
63mm (heat roller) intervals? Yes Replace the fixing unit.
High-voltage
power supply
PCB 4 Is the problem solved after the
high-voltage power supply
PCB is replaced? Yes Replace the high-voltage
power supply PCB.