If you repeatedly get "scan failed" it may be caused by a number of things.

Once you get it right once it is pretty easy but pay attention to the following:

  1. Do not scan too slow.
  2. When the C-Pen touch the paper and the light goes on - start scanning. Do not wait too long.
  3. Keep an even speed.
  4. Avoid rotating the C-Pen while scanning.
  5. Make sure that the text line to be scanned is centered between in the opening gap of the C-Pen.
  6. Keep the C-Pen at about a 90 degree angle towards the paper when scanning.

Check out these videos for a good visual: