Brother MFC-9840CDW - Image Distortion

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