Brother MFC-7450

1-33
Confidential
■ 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 of
laser unit.
Scanner motor
rotation failure
Is the problem solved
after replacing the laser
unit?
Ye s
Replace the laser unit.
3
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.