Canon DR-4010C Reference Guide - Page 53
Functions such as [Auto-detection], [Deskew], or [Border, Lines, smudges
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Symptoms Problem Solution Lines, smudges, or dirt appear on the scanned image. The scanning glass or rollers inside the scanner are dirty. Clean the scanning glass and rollers. (See p. 35.) 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. Symptoms Problem Solution The scanned image is abnormal for certain documents. Functions such as [Auto-detection], [Deskew], or [Border Removal] were used when scanning documents containing text or photos up to their edges. (The scanner cannot accurately process the edges of documents.) Disable functions such as [Auto-detection], [Deskew], or [Border Removal] when scanning documents containing text or photos up to their edges. Symptoms Problem Solution The scanned image is abnormal in some applications. A function not supported by the application was used. Some applications do not support functions such as autodetection of the paper size. Scanning documents with an application such as this will result in an abnormal scanned image. Try scanning with auto-detection of the paper size set to "off." Chapter 4 Troubleshooting 49