Canon MP490 series On-Screen Manual page 668

>
Advanced Guide Troubleshooting
Driver) Screen Does Not Appear
Error Message Appears and the ScanGear (Scanner Driver)
Screen Does Not Appear
Check 1: Make sure that the machine is turned on.
Check 2: Connect the USB cable to a different USB port on the computer.
Check 3: If the USB cable is connected to a hub, remove it from the hub
and connect it to a USB port on the computer.
Check 4: Make sure that the MP Drivers is installed.
If it is not installed, insert the Setup CD-ROM into the computer's disc drive, then select Custom Install
and install MP Drivers.
Check 5: On the File menu of the application, select Select Source and
select the machine.
Note
The operation may differ depending on the application.
Check 6: Make sure that the application is TWAIN-compliant.
You cannot open ScanGear (scanner driver) from applications not supporting TWAIN.
Check 7: Exit ScanGear (scanner driver) if it is running on another
application.
>
Problems with Scanning > Error Message Appears and the ScanGear (Scanner
Page top