Canon DR-2050SP User Manual page 80

Symptoms The scanned image is too dark (or faint).
Problem The [Brightness] setting is not set to an appropriate value.
Solution If the image is dark, set a higher [Brightness] setting, or if the
image is faint, set a lower [Brightness] setting.
(See "Software Settings," on p. 49.)
Symptoms Text or images on the rear side of your document
appear in the scanned image.
Problem The [Brightness] setting is too low, or the paper is too thin.
Solution Set a higher [Brightness] setting. If the paper is too thin, make a
copy of the documents and then scan the copy.
Symptoms Double-sided scanning is not possible.
Problem "Scanning Side" is set to [Simplex].
Solution
Set "Scanning Side" to [Double-sided].
Symptoms A black margin appears around the scanned document.
Problem A document smaller than the preset paper size has been
scanned. Or, the loaded document has shifted out of
position.
Solution Set "Paper size" to [Auto-detection]. Or, set [Border Removal] to
on.
Symptoms The scanned image is skewed.
Problem The document has been fed at an angle. (skew)
Solution
Use the document guide adapter to prevent document skew, and
set [Deskew] to on. (See p. 22.)
Symptoms Lines, smudges, or dirt appear on the scanned image.
Problem CauseThe scanning glass or rollers inside the scanner are
dirty.
Solution Clean the scanning glass and rollers.
If lines still appear on the image even after cleaning the scanning
glass and rollers, the scanning glass inside the scanner may be
scratched. Contact your local authorized Canon dealer or service
representative. (See p. 59.)
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Appendices