Black Level Value Abnormal At Scanning - Brother MFC-J3520 Service Manual

Error Code BC

Unable to Scan BC
Level of second side CIS scan result is detected as abnormal during FAX transmission
(after re-try.)
Step
1 White level data failure
2 White reference tape of
document pressure bar of ADF
cover stained
3 Second side CIS unit defective
4 White reference tape of
document pressure bar of ADF
cover damage, broken
5 Main PCB defective
Error Code BD

Unable to Scan BD

Black level value abnormal at scanning.

Step
1 Black level data failure
2 First side or second side CIS
unit defective
3 Main PCB defective
Cause
Carry out maintenance 55 to obtain white level
data.
Clean the white reference tape of document
pressure bar of ADF cover.
Replace the second side CIS unit.
Replace the ADF cover.
Replace the main PCB ASSY.
Cause
Carry out maintenance 55 to obtain white level
data.
Replace the first side or second side CIS unit.
Replace the main PCB ASSY.
2-49
LCD
Solution
LCD
Solution
Confidential