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Relevant electrical parts
Scanner assy CCD sensor unit
Image processing board (IPB)
1 Correct the harness connection between CCDB and IPB if faulty.
2 Check for possible extraneous light and correct as necessary.
3 Clean the lens, mirrors, CCD surface, and shading sheet if dirty
4 Correct reflective mirror of the scanner if faulty, or change scanner.
5 Change CCD sensor unit.
6 Change IPB.
Basically points to scanner section, not a lot to do with iu's or printheads.
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