Canon imageFORMULA DR-7090C Universal Reference Guide - Page 67
Practical Examples, Scanning Is Not Performed, Slow Scanning Speed
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■ Scanning Is Not Performed ■ Slow Scanning Speed If scanning does not start when it should, first confirm the following: ✔ Are the scanner and PC correctly connected with the proper cable? ✔ Is the scanner's power switch turned ON? If this does not solve the problem, consider the following possible causes: Cause Solution The ISIS/TWAIN driver and Job Registration Tool are not installed correctly Uninstall and then reinstall the ISIS/TWAIN driver and Job Registration Tool. Cause Another application is using the driver for this scanner. Solution Exit the application that is using the driver. Cause Solution Memory is insufficient due to scan conditions that require large amounts of memory. Exit the application currently in use, change the scanning configurations after restarting the application, and try scanning again. IMPORTANT If the scanning speed is slow, first confirm the following: Scanning may be slow if the USB interface does not support Hi-Speed USB 2.0. ✔ Does the PC's USB interface support only Full-Speed USB 1.1? ✔ Is the USB cable you are using the one that was supplied with the scanner (Hi-Speed USB 2.0 compliant)? ✔ Is a USB 1.1-compliant device connected to the USB hub at the same time? If this does not solve the problem, consider the following possible causes: Cause Other applications are running in the background on your PC. 4 Solution Quit all other applications that are running. Practical Examples Cause Resident applications, such as anti-virus software, are draining memory resources. Solution Quit all resident applications. Cause Solution Temporary files cannot be created in the TEMP folder, as there is not enough free space on the hard disk. Delete unnecessary files on the hard disk to increase free space. It the scanner does not operate because of a system error, turn the scanner OFF and wait at least 10 seconds before turning it back ON. If errors continue to occur, reboot the scanner and computer. ■ The Two Sides of a Document are Not Scanned Simultaneously During Duplex Scanning If the two sides of a document are scanned one side at a time during duplex scanning, confirm the following: ✔ Is Single-Pass Duplex set to ON in the user mode settings? ✔ Is Long Document mode set to OFF? IMPORTANT Single-pass duplex scanning is disabled when the amount of light emitted from the reverse-side scanning sensor is insufficient. (See p. 55.) 59