Brother MFC-9320CW Service Manual page 184

■ Faulty registration
(1) ADF
Step Cause
1 Fine adjustment
of scan start
position
misalignment
2 Document rear
sensor actuator
catching on some
position
(2) Document table
Step Cause
1 Fine adjustment
of scan start
position
misalignment
2 CIS unit failure
■ Dark
<User Check>
Step Cause
1 White level data
malfunction
2 CIS unit failure
3 Main PCB failure
Is the problem solved
by performing the fine
adjustment of scan start
position.
(Function code
Does the document rear
sensor actuator move
smoothly?
Is the problem solved
by performing the fine
adjustment of scan start
position.
(Function code
Is the problem solved
after replacing the
document scanner unit?
- Check whether the setting of the contrast does not become dark.
Is the problem solved by
performing the
acquisition of white level
data. (Function code
Is the problem solved
after replacing the
document scanner unit?
Is the problem solved
after replacing the main
PCB ASSY?
3-103
Check
Result
Yes
54)
No
Check
Result
Yes
54)
Yes
Check
Result
Yes
55)
Yes
Yes
Remedy
Perform the fine
adjustment of scan start
position.
(Function code 54)
Re-assembly the
document rear sensor
actuator.
Remedy
Perform the fine
adjustment of scan start
position.
(Function code 54)
Replace the document
scanner unit.
Remedy
Perform the acquisition
of white level data.
(Function code 55)
Replace the document
scanner unit.
Replace the main PCB
ASSY.
Confidential