Brother MFC-7450

1-43
Confidential
6. TROUBLESHOOTING OF SCANNIG
6.1 Cannot scan the document in the FB unit.
(If scan the document, it is completely white or black.)
6.2 Cannot scan the document in the ADF unit.
(If scan the document, it is completely white or black.)
User Check
• Check if there is the scanning surface of the FB unit scanning document in the lower
side.
Step Cause Check
Result Remedy
1
Document front
actuator not
operating
smoothly or
catching
Does document front
actuator move
smoothly? No
Re-assemble the
document front actuator.
2
Each harnesses
of FB unit
connection
failure
Is the each harnesses of
FB unit connected
securely?
Ye s
Reconnect the each
harnesses of FB unit.
3
FB unit failure Is the problem solved by
replacing the FB unit?
Ye s
Replace the FB unit.
4
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.
User Check
• Check if there is the scanning surface of the ADF unit document in the upper side.
Step Cause Check
Result Remedy
1
Each harnesses
of FB unit
connection
failure
Is the each harnesses of
FB unit connected
securely?
No
Reconnect the each
harnesses of FB unit.
2
FB unit failure Is the problem solved by
replacing the FB unit?
Ye s
Replace the FB unit.
3
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.