Canon DR-2080C Startup Startup Manual page 72

Cause Attempting to use a function of the DR-2080C that is not
supported by the application software.
Action
Some application software may not support certain functions,
such as automatically detecting the paper size or changing the
scanning mode/resolution through the scan panel. Using such
application software for scanning may yield abnormal scanning
results. Try scanning without using functions such as automatic
paper size detection or margins settings.
If images still are not scanned properly after you take the actions described
above, adjust the scanner.
CAUTION
Before adjusting the scanner, make sure that you clean the
scanning glass inside the scanner. (→ page 56) If you adjust the
scanner while the scanning glass is dirty, vertical lines may
appear in scanned images. When you adjust the scanner, note
that previous adjustments are deleted and cannot be recovered.
Set the adjustment sheet sideways, so that it feeds into the scanner from the
long edge. After setting the sheet, on the Start menu, point to Programs (when
using Windows XP, point to All Programs), point to Canon Document
Scanner, and then click DR-2080C Adjustment Tool. You can also use the
ISIS/TWAIN driver's Scanner Adjustment function. If you perform one of the
actions described above, a dialog box is displayed. Follow the instructions on
the screen. For details on the ISIS/TWAIN driver's Scanner Adjustment
function, refer to the ISIS/TWAIN driver help.
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Troubleshooting
Adjustment
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Adjustment sheet