Canon DR-9080C - Manual (Page 70)

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Chapter 6 Troubleshooting
USB Connections
Cause Scanner is not correctly connected.
Remedy Connect the scanner correctly with a cable that supports USB 2.0.
Cause The USB 2.0 interface card is not correctly installed to the
computer.
Remedy Refer to the USB 2.0 interface card operation manual and install it
correctly. Also, check if the USB 2.0 interface card is being recognized
by Windows in the operating system you are using.
Cause The scanner is OFF.
Remedy Check the connections with the computer, and then turn ON the
scanner.
Cause The USB 2.0 interface card dose not support the scanner.
Remedy Use one of the recommended USB 2.0 interface cards. (See p.22.)