Usally this is due to dirt accumulated on the glass surfaces of the scanner. Make sure that both glass windows inside the scanner are clean. Next step is to clear both CCD's (read heads) but in this case you need to disassemble the scanner.
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Usally this is due to dirt accumulated on the glass surfaces of the scanner.
Make sure that both glass windows inside the scanner are clean.
Next step is to clear both CCD's (read heads) but in this case you need to disassemble the scanner.