Canon PIXMA MP500 MP500 User's Guide - Page 129
Computer stops operating during scanning, Scan quality is poor Poor image displayed on the monitor - scanning software
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Cause The Feature of the application software does not support TWAIN. Action Start ScanGear MP from within a TWAIN compatible software. An error message appears and the ScanGear MP window fails to appear. z Reattaching the USB cable. Be sure to use a certified USB 2.0 Hi-Speed cable. You are recommended to use the cable no longer than 9.8 feet (3 meters). z If a USB hub is used for the connection, do not use it. Attach the cable to a USB port on the computer itself (not the hub). z Attach the USB cable to a different USB port on the computer itself (not a hub). z Set the Setup CD-ROM and install the software. z Select this machine in [Select Source] or [Import] in your application software. z Make sure that your application software supports TWAIN. You cannot start ScanGear MP from within an applilcation software that does not support TWAIN. Computer stops operating during scanning Cause Output Resolution set too high. Action Reboot the computer, lower the Output Resolution and rescan. The hard disk does not have enough available space. Multiple devices connected to the USB port. z Reset and reboot the computer, delete unnecessary files and application softwares, and rescan. z Open ScanGear MP from within the application software, click the [Preferences] button in the Advanced Mode, and change the folder listed in the [Select Folder Where Temporary Files are Saved] category to one on a disk with sufficient free space. Disconnect all other devices but the machine from the port. Scan quality is poor (Poor image displayed on the monitor) Cause The resolution is low. Specification of the application software. Moiré appears. Inappropriate display settings. Action If the image looks grainy, increase the scan resolution. For details, refer to the Scan Guide. Some application software does not display the image clearly if the image is too small. Set the view mode to 100%. Set [Descreen] to [ON] in the [Image Settings] section of the Advanced Mode of ScanGear MP. Note Moiré may appear when you scan digital photo prints. Set your display settings on your computer to Medium (16 bit) or higher. In the [Start] menu click [Control Panel], then [Appearance and Themes] and then [Display], and on the [Settings] sheet, set [Color quality] to [Medium (16 bit)] or [Highest (32 bit)] or a higher setting. Dirty document glass or document cover. In the System Preferences dialog, click the [Displays] icon and select the [Display] tab. Set the [Colors] list box to [Thousands] or a higher setting. Refer to "Cleaning Your Machine" to clean them. Chapter 11 Troubleshooting 127