Targa PNA-E3540N User Manual And Service Information page 102

After Connecting the Device to a Computer it Does Not Establish any
Link.
Make sure that you have inserted the USB cable properly. If you have
connected the navigation device to the computer via a hub or USB
extension cable, try connecting it directly to the computer.
Unplug the USB cable and reconnect it again to the computer. You
can also try a different USB port on your computer, if one is available.
Navigation Device PNA-E3540N
Troubleshooting
101