Sharp MX-5500N User Manual page 561

Scanning area
If colored lines or white lines appear in images scanned using the automatic document feeder, clean the scanning area
(the thin long glass next to the document glass).
To clean this area, use the glass cleaner that is stored in the automatic document feeder. After using the glass cleaner,
be sure to return it to its storage position.
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Examples of lines in the image
Black lines White lines
Open the automatic document feeder
and remove the glass cleaner.
Clean the document scanning area on
the document glass with the glass
cleaner.
One scanning area is on the document glass and the other is
inside the automatic document feeder.
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