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    Unknown Device shown in device manager - scanner

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    Unplug scanner, plug into different USB socket (not monitor)

    Try scanner on another PC (does it work there? scanner probably not broken)

    Bring working scanner to original PC where non-working one was (with the working USB Cable)

         Working scanner still working

            Try it here with the cable from the non-working scanner

                     Working? re-plug in non-working scanner back call CDP

                     Not working? could be a bad USB cable

         Working scanner does not work here - possible issue with the USB port, try another usb port.

     

    If unknown device is present no matter which PC the scanner is connected to - then it may need repair.

        

     

     

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