Hollow Print - Brother DCP-9045CDN Service Manual

Unstable color density
User Check
- Replace the belt unit with a new one.
- Replace the drum unit with a new one.
- Replace the waste toner box with a new one.
- Replace the toner cartridge with a new one.
Step Cause
1 Drum unit
conduction failure
2
Toner cartridge
electrode
connection failure
3
Dirt on belt unit
electrode
4
Main PCB failure
5
Engine PCB
failure
6
Transfer HVPS
PCB failure
7
Charge HVPS
PCB failure
8
Laser unit failure

Hollow print

User Check
- Select the 'Thick paper mode' in the printer driver, or use thinner paper than
you are currently using.
- Check the machine's environment, conditions such as high humidity may
cause this situation to occur.
Step Cause
1
Fuser unit failure
Check
Are the electrodes on the
drum unit and machine
body dirty?
Are the electrodes on the
toner cartridge and
machine body dirty?
Are the electrodes on the
belt unit and machine
body dirty?
Is the problem solved
after replacing the main
PCB ASSY?
Is the problem solved
after replacing the engine
PCB ASSY?
Is the problem solved
after replacing the
transfer HVPS PCB
ASSY?
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
Is the problem solved
after replacing the laser
unit?
Check
Is the problem solved
after replacing the fuser
unit?
1-59
Remedy
Result
Yes Clean both electrodes.
Yes Clean both electrodes.
Yes Clean both electrodes.
Yes Replace the main PCB
ASSY.
Yes Replace the engine PCB
ASSY.
Yes Replace the transfer
HVPS PCB ASSY.
Yes Replace the charge
HVPS PCB ASSY.
Yes Replace the laser unit.
Remedy
Result
Yes Replace the fuser unit.
Confidential