Brother MFC-P2000 - B/W Laser Printer Service Manual page 84

I-12 Image distortion
<Scanning side>
Possible cause Step
Separation roller
failure
Document feed
roller failure
Scanner motor
failure
Main PCB
failure
<Printing>
Possible cause Step
Laser unit
LD emission
failure
Laser motor
rotation failure
Laser scanner
connection
failure
Check
1 Do the separation roller and its
related sections work
correctly?
2 Do the document feed roller
and their related gears work
correctly?
3 Does the scanner motor work
correctly?
Is the scanner motor harness
connected securely?
4 Is the problem solved after the
main PCB is replaced?
Check
1 Is the laser unit secured to the
frame incorrectly?
Is there any play?
2 Is the laser diode or the laser
scanner motor defective?
3 Is the scanner harness
connected properly?
Is it coming loose?
Result
No
No
No
Yes
Result
Yes
Yes
Yes
IV-15
Remedy
Replace the separation roller
or its related parts.
Replace the document feed
rollers or their related gears.
Replace the scanner motor, or
reconnect the scanner motor
harness correctly.
Replace the main PCB.
Remedy
Secure the unit correctly and
tighten the screws.
Replace the laser unit.
Connect the harness correctly.