Canon imageFORMULA RS40 Photo and Document Scanner - Manual (Page 52)

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Problem 12 The size detection and deskew functions fail.
Solutions When [Carrier sheet] is set to [Carrier sheet] in the
[Feeding] tab of the scanner driver settings screen and
you scan a document with black edges without
inserting it in a carrier sheet, the size detection and
deskew functions may fail. In such cases, disable the
size detection and deskew functions, or set [Carrier
sheet] to [None] in the [Feeding] tab.
Problem 13 Photos do not feed correctly.
Solutions • If the photos are curled, flatten them until the curl is
less than 2 mm.
• Photos may stick together, depending on the
thickness and type of paper used for the photo. If they
stick together, feed them one at a time.
• Reduce the number of photos loaded at one time.
Problem 14 Double feed error occurs because of instant photo.
Solutions Instant photos are made with a combination of layers,
so they may be incorrectly judged to be a double-feed.
If this happens, disable double-feed detection.