Scanning Image Defect Troubleshooting; Image Defect Examples; Troubleshooting Image Defect - Brother DCP-L8400CDN Service Manual

4.12 Scanning Image Defect Troubleshooting

4.12.1 Image defect examples

Light on the page
Completely blank

4.12.2 Troubleshooting image defect

■
Light on the page
Step
1
2
3
Faulty registration (2-128)
(2-126)
Vertical streaks (2-129)
(2-129)
< User Check >
- Check whether the setting of the contrast does not become light.
- Clean the document glass or first side CIS glass.
- Clean the first side CIS glass of the ADF.
Cause
White level calibration data
failure
First side or second side CIS
unit failure
Main PCB failure
White vertical streaks
Fig. 2-16
Perform the acquisition of white level data.
(Function code
Replace the first side or second side CIS
unit.
Replace the main PCB ASSY.
2-127
Dark (2-128)
(2-130)
Remedy
55)
Confidential