"If the APM is powered by the PM with power and the jumper JP1 is set and not through the ESC, then the ESC must only be connected with the signal-line to the OUTPUT and the first one with GND too.
The receiver should also be connected with a…"
"Is the APM powered through the PM-connector with 5V?
If APM is connected to PM with 5V power, then the other connections (In - and Output) may have no more powerconntions?
Can someone explain the connections with APM, Q BRAIN, motor and receiver."