Brother DCP-7030 Service Manual page 51

■ Image distortion
Step Cause
Laser unit not
assembled
1 correctly
Incorrect
radiation angle of
scanner diode of
2
laser unit.
Scanner motor
rotation failure
Main PCB failure Is the problem solved
3
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?
after replacing the main
PCB ASSY?
1-33
Result Remedy
Assemble the laser unit
correctly and secure the
No screw.
Replace the laser unit.
Yes
Replace the main PCB
Yes ASSY.
Confidential