Brother MFC-J3520 Service Manual page 114

Completely blank

Step
1 White level correction data
failure
2 First side or second side CIS
flat cable connection failure
3 The first side or second side
CIS flat cable defective
4 First side or second side CIS
unit defective
5 Main PCB defective
Straight vertical stripes

Step
1 Foreign materials on the lens
surface of CIS unit
2 First side or second side CIS
unit defective
User Check
- Check that documents are not reversed.
- Check that they are set in the ADF tray securely.
Cause
Carry out maintenance 55.
Reconnect the first side or second side CIS flat
cable.
Replace the first side or second side CIS flat
cable.
Replace the first side or second side CIS unit.
Replace the main PCB ASSY.
User Check
- Clean document cover glass or ADF glass.
- Clean the document pressure bar.
Cause
Remove foreign materials.
Replace the first side or second side CIS unit.
2-80
Solution
Solution
Confidential