Yamaha RP-U100 Manual Do Proprietário

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Error Message at Startup
The error message "Can't find RP-U100 !!" appears when the main unit and 
personal computer are not connected with a USB cable.
Connect the RP-U100 unit to the computer with a USB cable when using the 
application.
Even if the RP-U100 unit and computer are connected by a USB cable, the error 
message will appear if the power cord of the RP-U100 is not plugged into the AC 
outlet.