Brother MFC-9320CW Service Manual page 185

■ Completely blank
Step Cause
1 White level data
malfunction
2 CIS unit failure
3 Main PCB failure
■ Vertical streaks
Step Cause
1 CIS unit failure
■ White vertical streaks
<User Check>
Step Cause
1 CIS unit failure
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?
<User Check>
- Check if the ADF glass or document glass is not
stained.
Is the problem solved
after replacing the
document scanner unit?
- Check if the ADF glass or document glass is not stained.
Is the problem solved
after replacing the
document scanner unit?
3-104
Check
Result
Yes
55)
Yes
Yes
Check
Result
Yes
Check
Result
Yes
Remedy
Perform the acquisition
of white level data.
(Function code 55)
Replace the document
scanner unit.
Replace the main PCB
ASSY.
Remedy
Replace the document
scanner unit.
Remedy
Replace the document
scanner unit.
Confidential