Image Distortion - Brother DCP-9045CDN Service Manual

Image distortion

Step Cause
1 Laser unit not
assembled
correctly
2 Incorrect radiation
angle of scanner
diode
Scanner motor
rotation failure
All one color
Step Cause
1 Corona wire
failure
2
3 Charge HVPS
PCB failure
4 Main PCB failure
5 Engine PCB
failure
6 Laser unit failure
Check
Is the laser unit
assembled into the
machine securely?
(Check if there is no gap.)
Is the problem solved after
replacing the laser unit?
Check
Are the electrodes on the
drum unit of the
appropriate color and
machine body dirty?
Is the corona wire
damaged?
Is the problem solved after
replacing the charge
HVPS PCB ASSY?
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 laser unit?
1-49
Remedy
Result
No Assemble the laser unit
correctly and secure the
screw.
Yes Replace the laser unit.
Remedy
Result
Yes Clean both electrodes.
Yes Replace the drum unit.
Yes Replace the charge
HVPS PCB ASSY.
Yes Replace the main PCB
ASSY.
Yes Replace the engine PCB
ASSY.
Yes Replace the laser unit.
Confidential