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.