Brother DCP-8070D Service Manual page 173

■ Faulty registration
1. ADF
Step Cause
Document rear
1 actuator catching
on some position
Fine adjustment
of scan start
2 position
misalignment
2. Document table
Step Cause
Fine adjustment
of scan start
1 position
misalignment
Scanner module
failure
2
■ Dark
Step Cause
White level data
malfunction
1
Scanner module
failure
2
Main PCB failure Is the problem solved by
3
Check
Does the document rear
actuator move
smoothly?
Is the problem solved by
performing the fine
adjustment of scan start
position.
(Function code 54)
Check
Is the problem solved by
performing the fine
adjustment of scan start
position.
(Function code 54)
Is the problem solved by
replacing the CCD unit
(CCD model) or
document scanner unit.
(CIS model)
<User Check>
- Check whether the setting of the contrast does not become dark.
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.
3-82
Result Remedy
Re-assembly the document
No rear actuator.
Perform the fine
adjustment of scan start
Yes position.
(Function code 54)
Result Remedy
Perform the fine
adjustment of scan start
Yes position.
(Function code 54)
Replace the CCD module.
(CCD model)
Yes Replace the document
scanner unit. (CIS model)
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
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