If a line of dots appears in all your scanned
images, try these solutions:
Clean the scanner glass with a soft, dry, lint-free cloth or
use a small amount of glass cleaner on the cloth, if necessary.
Paper towels are not recommended.
Caution:
Do not spray glass cleaner directly on the
scanner glass.
Make sure any interface cables are securely connected at both
ends.
Keep the document cover closed to prevent dirt or dust from
getting inside.