Brother HL-4040CN - All One Color; Dirt on the Back of Paper

Confidential
1-46
All one color
Step Cause
Check Result Remedy
1 Are the electrodes on the
drum unit of the
appropriate color and
machine body dirty?
Yes Clean both electrodes.
2
Corona wire
failure
Is the corona wire
damaged?
Yes Replace the drum unit.
3 Transfer HVPS
PCB failure
Is the problem solved
after replacing the
transfer HVPS PCB
ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
4 Charge HVPS
PCB failure
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.
5 Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Yes Replace the main PCB
ASSY.
6 Engine PCB
failure
Is the problem solved
after replacing the engine
PCB ASSY?
Yes Replace the engine PCB
ASSY.
7 Laser unit failure Is the problem solved
after replacing the laser
unit?
Yes Replace the laser unit.
Dirt on the back of paper
User Check
- If there is dirt on the back of the paper in duplex printing, the
back of the paper tray may be dirty. Clean the back of the
paper tray.
Step Cause
Check Result Remedy
Yes Print approximate 10
pages.
1 Fuser unit dirty Is the pressure roller
ASSY dirty? Is any other
area in the machine dirty?
No Replace the fuser unit.
2 Dirt in the paper
feed system
Is the paper tray or feed
system on the drum unit
dirty with toner?
Yes Wipe dirt off.
3 Belt unit dirty Is the problem solved by
replacing the belt unit?
Yes Replace the belt unit.