152
Troubleshooting
Chapter 14
After installing the MP Toolbox
and MP Drivers, you installed a
TWAIN-compliant application.
After installing the software on the machine, if you install a
TWAIN-compliant application, the TWAIN system files may not be
correctly overwritten, and thus images may not be scanned. Uninstall
the software from the machine, then reinstall it. (See page 113.)
The machine is not recognized in
the [Scanners and Cameras]
window of [Control Panel].
Follow this procedure to check whether the machine icon is present
in [Scanners and Cameras] of [Control Panel]:
1. Confirm that the USB cable is connected, and start the computer.
2. Click [Start] on the taskbar, point to [Settings], then click [Control
Panel]. (Windows XP: Click [Start] on the taskbar, then [Control
Panel].)
3. Double-click [Scanners and Cameras]. (Windows XP: In the
[Control Panel] window, click [Printers and Other Hardware],
then [Scanners and Cameras].)
4. In the [Scanners and Cameras] window, if [Canon MP390]
(Windows XP: [WIA Canon MP390]) is present, the machine is
recognized. If not, uninstall the software and reinstall it. (See page
113.)
Memory is insufficient.
Close other open applications and try again.
The hard disk does not have
enough available memory.
Check that the hard disk has enough available memory, in particular
when scanning large documents at a high resolution. For example, an
A4-size document scanned at 600 dpi, color requires a minimum of
300 MB of memory. If you do not have enough available memory,
scan the document at a lower resolution.
The resolution is low.
If the image looks grainy, increase the scan resolution.
(See
Software Guide
.)
The image is not displayed at
100% magnification in the
application.
Display the image at 100% magnification. Some applications do not
display an image well smaller.
There is moire when you scan
printed material.
In ScanGear MP, click [Descreen]. (See
Software Guide.
)
The monitor display colors are set
too low.
In [Display Properties], set the display colors to 16-bit color, 24-bit
color or higher.
The scanning area is not specified. In ScanGear MP, click [Multi-Scan] to automatically specify the
scan area.
If there are white margins around documents such as photographs, or
if you want to trim a document (i.e. you want to scan only one part
of a document), specify the area of the scan manually. (See
Software
Guide
.)
The scanned area does not cover
the entire document.
Place the document approximately 3 mm (1/8 in.) away from the
front and right edges of the platen glass.
Cause
Action