Brother MFC Series Service Manual page 105

■ 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
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
Carry out maintenance 55.
(Refer to
Replace the CIS unit.
Replace the Main PCB ASSY.
Cause
Carry out maintenance 59.
(Refer to
2-73
Solution
Solution
Chapter 5, Section 1.4.15)
Solution
Chapter 5, Section 1.4.18)
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