Sharp LL-S201A - Manual (Page 9)

4. MAKE A CONNECTION BETWEEN LL-S201A AND PC
In order to operate each function, it is necessary to change LL-S201A and PC into
connection state. The start-up state of ServiceTool is “Not Connected”, so please push
the “Connect” button first.
When the cable is not connected, or when there is no response from a display, the
message of the purport as “connection error” is displayed.
If the cable is connected normally, and there is no response from a display, the main
board may not be operating.
A following cause can be considered as a cause by which the below error message is
displayed by USB connection.
cable is not connected
board is out of order
power supply of display is not on