Sharp AM-900 Online Manual page 30

Installing the Software
Comments:
Do not connect the AM-900 to a hub to which another AM-900 is
connected. If this is done, the AM-900 will not operate correctly.
If you find that your computer does not recognize the machine or operation
is unstable, try connecting the USB cable to a different USB port on your
computer, or try a different USB cable (use the shortest possible cable).
12.
Plug in the power cord of the machine. This completes the installation of the
software.
28