Brother ImageCenter ADS-2400N, Service Manual, Page: 36 / 123

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4.2 Troubleshooting for Image Defects
4.2.1 Defect examples
Fig. 2-5
4.2.2 Troubleshooting according to image defect

Light
<User Check>
- Check that the contrast setting is not too light.
- Clean the CIS glass.
Step Cause Remedy
1
Incorrect white level correction data Execute the maintenance mode function
"Acquire white level data and set CIS scan
area". (Refer to
“1.3.5” in Chapter 5 .)
2
Dirty calibration sheet Replace the calibration sheet with a new
one.
3
First side or second side CIS unit
failure Replace the first side or second side CIS
unit.
4 Main PCB failure Replace the main PCB ASSY.
Light
White vertical
streaks Vertical streaks Completely
blank
Hue defect
Faulty registration Dark or
bluish white
Expanded image
Dot or dirt