Horizontal Lines - Brother DCP-7030 Service Manual

■ Downward fogging of solid color
Step Cause
HVPS PCB
1 failure
Main PCB failure Is the problem solved
2

■ Horizontal lines

Step Cause
Dirt on charge
1 electrode
Paper tray
ground terminal
2
located in
machine body
Laser unit failure
3
User Check
• Toner may be empty. Replace the toner cartridge with a new one.
Check
Is the problem solved
after replacing the
HVPS PCB ASSY?
after replacing the main
PCB ASSY?
User Check
• The paper tray ground terminal located 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
located in the machine
body?
Is the problem solved
after replacing the laser
unit?
1-41
Result Remedy
Replace the HVPS PCB
Yes ASSY.
Replace the main PCB
Yes ASSY.
Result Remedy
Clean both electrodes.
Yes (Refer to Fig. 1-1, Fig.
Correct the bending of
paper tray ground terminal.
Yes
Replace the laser unit.
Yes
1-2.)
Confidential