Brother DCP-J552DW Service Manual page 114

■ White vertical streaks
Step
1 CIS unit defective
2 White reference film stained
3 Scratched or damaged white
reference film
■ Shades in the entire image
Step
1 White level correction data failure Carry out maintenance 55.
2 CIS unit defective
3 Main PCB defective
■ Entire image is distorted
Step
1 CIS type mismatches
<User Check>
- Clean the document cover glass or ADF glass.
Cause
Replace the CIS unit.
Clean the white reference film of the document
scanner unit.
Replace the document scanner unit.
<User Check>
- Clean the document cover glass or ADF glass.
- Clean the document pressure bar.
Cause
(Refer to
Replace the CIS unit.
Replace the main PCB ASSY.
Cause
Carry out maintenance 59.
(Refer to
2-81
Solution
Solution
Chapter 5, Section 1.3.17)
Solution
Chapter 5, Section 1.3.20)
Confidential