Brother HL-4040CN - Reprinting and Secure Printing

Confidential
1-56
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
Check Result Remedy
1
Drum unit
conduction failure
Are the electrodes on the
drum unit and machine
body dirty?
Yes Clean both electrodes.
2
Toner cartridge
electrode
connection failure
Are the electrodes on the
toner cartridge and
machine body dirty?
Yes Clean both electrodes.
3
Dirt on belt unit
electrode
Are the electrodes on the
belt unit and machine
body dirty?
Yes Clean both electrodes.
4
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Yes Replace the main PCB
ASSY.
5
Engine PCB
failure
Is the problem solved
after replacing the engine
PCB ASSY?
Yes Replace the engine PCB
ASSY.
6
Transfer HVPS
PCB failure
Is the problem solved
after replacing the
transfer HVPS PCB
ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
7
Charge HVPS
PCB failure
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.
8
Laser unit failure Is the problem solved
after replacing the laser
unit?
Yes Replace the laser unit.
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
Check Result Remedy
1
Fuser unit failure Is the problem solved
after replacing the fuser
unit?
Yes Replace the fuser unit.