Horizontal Lines - Brother HL-4040CN Service Manual

Downward fogging of solid color
User Check
- Toner may be empty. Replace the toner cartridge with a new one.
Step Cause
1 Transfer HVPS
PCB failure
2 Charge HVPS
PCB failure

Horizontal lines

Step Cause
1 Dirt on charged
electrode
2 Paper tray ground
terminal provided
in machine body
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
1 Transfer HVPS
PCB failure
2 Charge HVPS
PCB failure
Check
Is the problem solved
after replacing the
transfer HVPS PCB
ASSY?
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
User Check
- The paper tray ground terminal provided in the machine body
may be dirty. Clean the contact with a dry cloth.
Check
Are the electrodes on the
drum unit and machine
body dirty?
Is the paper tray ground
terminal bent, which is
provided in the machine
body?
Check
Is the problem solved
after replacing the
transfer HVPS PCB
ASSY?
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
1-54
Remedy
Result
Yes Replace the transfer
HVPS PCB ASSY.
Yes Replace the charge
HVPS PCB ASSY.
Remedy
Result
Yes Clean both electrodes
Yes Correct bending of paper
tray ground terminal.
Remedy
Result
Yes Replace the transfer
HVPS PCB ASSY.
Yes Replace the charge
HVPS PCB ASSY.
Confidential