Owner's Manual

46 Troubleshooting
Problem Temporary files cannot be created in the TEMP folder,
as there is not enough free space on the hard disk.
Solution Delete unwanted files on the hard disk to increase free
space on the hard disk.
Problem The USB port you are using does not support Hi-Speed
USB 2.0.
Solution Scanning speeds are lower if your computer’s standard
USB interface is not compatible with Hi-Speed USB 2.0.
Use a computer that is equipped with USB that is
compatible with Hi-Speed USB 2.0 as standard. (See “1-4
Installation Requirements,” on p. 14.)
Problem The USB cable does not support Hi-Speed USB 2.0.
Solution Use the USB cable provided with the scanner.
Problem The USB hub does not support Hi-Speed USB 2.0.
Solution Remove the USB hub.
✘ Documents Do Not Feed Properly
The following are possible causes of a document failing to feed
properly. Check each possible cause.
Problem Static electricity, etc., is causing the pages of the
document to stick together, and they cannot be
separated correctly by the scanner.
Solution Before you place your document, thoroughly fan the stack of
papers. (See “2-3 Placing Documents,” on p. 22.)
Problem Attempting to scan a document of a size, thickness, or
weight that the scanner cannot scan.
Solution Check the size, thickness, and weight of the document. For
precautions concerning documents, see “2-1 Documents,”
on p. 16.
Problem The rollers inside the scanner are dirty or worn.
Solution Clean the rollers, see “3-1 Regular Maintenance,” on p. 34.
If the rollers are worn, then they need to be replaced.
Contact your local authorized Canon dealer or service
representative to purchase a roller replacement kit.