Troubleshooting For Scanned Image Defects; Defect Examples; Troubleshooting According To Image Defect - Brother PDS-5000 Service Manual

4.3 Troubleshooting for Scanned Image Defects

4.3.1 Defect examples

Light (2-18)
Vertical streaks (2-20)

4.3.2 Troubleshooting according to image defect

 Light
Step
OD adjustment value failure
1
Dirt on the first side glass or second
2
side glass
First side LED light PCB or second
3
side LED light PCB failure
First side CCD unit or second side
4
CCD unit failure
Main PCB failure
5
Faulty registration (2-19)
White vertical
streaks (2-21)
<User Check>
- Check that the contrast setting is not too light.
- Clean the scanning area.
Cause
Dark (2-19) Completely
blank (2-19)
Partial shading Colored background (2-21)
(2-21)
Fig. 2-5
Acquire OD adjustment value. (Refer to
OD Adjustment (Optical Density Learning)"
in Chapter 4.)
Clean the first side glass ASSY or second
side glass ASSY.
Replace the first side LED light PCB or
second side LED light PCB.
Replace the first side CCD unit or second
side CCD unit.
Replace the main PCB ASSY.
2-18
All black
(2-20)
Remedy
"3.1
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