Canon Pixma MP495 Series On-Screen Manual page 661

Error Message Appears and the ScanGear (Scanner Driver) Screen Does Not ...
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Advanced Guide Troubleshooting
Driver) Screen Does Not Appear
S904
Error Message Appears and the ScanGear (Scanner Driver)
Screen Does Not Appear
Check 1: Make sure that the machine is turned on.
Check 2: Turn off the machine, then reconnect the USB cable and replug
the power cord.
Check 3: Connect the USB cable to a different USB port on the computer.
Check 4: If the USB cable is connected to a USB hub, remove it from the
USB hub and connect it to a USB port on the computer.
Check 5: 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 6: On the File menu of the application, select Select Source and
select the machine.
Note
The operation may differ depending on the application.
Check 7: Make sure that the application is TWAIN-compliant.
You cannot open ScanGear (scanner driver) from applications not supporting TWAIN.
Check 8: Exit ScanGear if it is running on another application.
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Problems with Scanning > Error Message Appears and the ScanGear (Scanner
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