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.
Remove any dust or dirt that may have adhered to your
original.
Do not press with too much force on the original or the
document cover.
Keep the document cover closed to prevent dirt or dust from
getting inside.
If you are scanning from the ADF, make sure the ADF edge guide
fits against the loaded originals. You can also try cleaning the
ADF and scanning again.