Brother MFC-9840CDW All in One Printer User Manual


 
Confidential
1-54
Downward fogging of solid color
User Check
- Toner may be empty. Replace the toner cartridge with a new one.
Step Cause
Check Result Remedy
1 Transfer HVPS
PCB failure
Is the problem solved after
replacing the transfer
HVPS PCB ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
2 Charge HVPS
PCB failure
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.
3 Engine PCB
failure
Is the problem solved
after replacing the engine
PCB ASSY?
Yes Replace the engine PCB
ASSY.
Horizontal lines
User Check
- The paper tray ground terminal provided in the machine body
may be dirty. Clean the contact with a dry cloth.
Step Cause
Check Result Remedy
1 Dirt on charged
electrode
Are the electrodes on the
drum unit and machine
body dirty?
Yes Clean both electrodes
2 Paper tray ground
terminal provided
in machine body
Is the paper tray ground
terminal bent, which is
provided in the machine
body?
Yes Correct bending of
paper tray ground
terminal.
Ghost
User Check
- Check the machine’s environment, conditions such as high humidity may
cause this situation to occur.
- Check that the appropriate media type is selected in the printer driver.
- Replace the drum unit with a new one.
Step Cause
Check Result Remedy
1 Transfer HVPS
PCB failure
Is the problem solved after
replacing the transfer
HVPS PCB ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
2 Charge HVPS
PCB failure
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.
3 Engine PCB
failure
Is the problem solved
after replacing the engine
PCB ASSY?
Yes Replace the engine PCB
ASSY.