Canon MP800R - Manual (Page 153)

Chapter 12 151 Troubleshooting
„ Cannot display preview
„ Computer stops operating during scanning
„ Scan quality is poor (Poor image displayed on the monitor)
Cause Action
An error message “Release the lock
switch” appears and the machine
fails to preview. Close the application softwares, disconnect the USB interface cable from
the scanner and set the Scanner Lock Switch to the release position. Then
reconnect the USB interface cable to the computer. For details on
releasing the Scanner lock, refer to the Setup Guide.
Cause Action
Output resolution set too high. Reboot the computer, lower the output resolution and rescan.
The hard disk does not have enough
available space.
z Reset and reboot the computer, delete unnecessary files and
application software, 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.
Multiple devices connected to the
USB port. Disconnect all other devices but the machine from the port.
Cause Action
The resolution is low. If the image looks grainy, increase the scan resolution.
For details, refer to the Scan Guide.
Specification of the application
software. Some application software does not display the image clearly if the image
is too small. Set the view mode to 100%.
Moiré appears. 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.
Inappropriate display settings.
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.
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.
Dirty Platen Glass or FAU Protective
Sheet. See “Cleaning Your Machine” on page 121 to clean them.
The status of the original is poor. Scan with certain functions such as [Reduce Dust and Scratches], [Fading
Correction] or [Grain Correction] in the [Image Settings] section of the
Advanced Mode of ScanGear MP.
Note
If a print out of an image does not appear satisfactory or the same as what
you see on the monitor, you may need to change the machine’s settings,
or the machine itself may have engaged in problems.