The optics need to be cleaned under the scanner glass. This is best done by a tech. This has to be done with the machine unplugged. The glass has to be removed then clean both sides then clean the small glass to the left on both sides, this is the glass where the document scanning is done. Also clean the lens and full and half rate mirrors. Using an air cleaner is not a good idea because it blows the dust all over the optics. Usually lens and mirror cleaner or alcohol is used. After it is cleaned I would use Kimzi's calibration links.
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