Scanned-Image Problems; Defective Images; Troubleshooting From Image Defect - Brother MFC-J3520 Service Manual

4.8

Scanned-image Problems

4.8.1 Defective images

Light
Completely blank
Colored over the whole page

4.8.2 Troubleshooting from image defect

Light
Step
1 White level correction data
failure
2 First side or second side CIS
unit defective
3 Main PCB defective
Scanning position failure
Straight vertical stripes
Entire image is distorted
Fig. 2-11
User Check
- Check if the contrast is set to "Light."
- Clean document cover glass or ADF glass.
- Clean the document pressure bar.
Cause
Carry out maintenance 55.
Replace the first side or second side CIS unit.
Replace the main PCB ASSY.
2-78
Dark
White vertical streaks
Solution
Confidential