Brother DCP-8070D Service Manual page 174

■ Completely blank
Step Cause
White level data
malfunction
1
Scanner module
failure
2
Main PCB failure Is the problem solved by
3
■ Vertical streaks
Step Cause
Scanner module
failure
1
ADF or
document glass
failure
2
Check
Is the problem solved by
performing the
acquisition of white level
data. (Function code 55)
Is the problem solved by
replacing the CCD unit
(CCD model) or
document scanner unit.
(CIS model)
replacing the main PCB.
<User Check>
- Check if the ADF glass or document glass is not stained.
Check
Is the problem solved by
replacing the CCD unit
(CCD model) or
document scanner unit.
(CIS model)
Is the problem solved by
replacing the scanner
top cover ASSY (CCD
model) or document
scanner unit. (CIS
model)
3-83
Result Remedy
Perform the acquisition of
white level data. (Function
Yes
code 55)
Replace the CCD module.
(CCD model)
Yes Replace the document
scanner unit. (CIS model)
Replace the main PCB.
Yes
Result Remedy
Replace the CCD module.
(CCD model)
Yes Replace the document
scanner unit. (CIS model)
Replace the top cover
ASSY. (CCD model)
Replace the document
Yes
scanner unit. (CIS model)
Confidential