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.
If you are scanning from the ADF, make sure the ADF
edge guides fit against the loaded originals. You can also try
cleaning the ADF and scanning again.