1. Ensure that the scanner is connected properly and that the drivers are up to date.
2. Check that all of the scanning settings are correct. This includes choosing the right file format, resolution, and color profile.
3. Inspect the document carefully to make sure that all of the pages are in the same orientation.
4. Clean the scanner glass and remove any dust particles or residue that may be causing an issue.
5. If all else fails, contact the manufacturer of the scanner for assistance.