OK, guys. The problem solved by rebinding transmitter by this algorithm. It works without standalone fail safe function.
First the remote comes already bind to the receiver, but in some instances the binding process need to be repeated, this is because of the fail safe feature of the receiver that needs to be calibrated. This manifest itself in this situation:
With the board On, if you turn Off the remote, the motors will start spinning without input. This is because the receiver needs to record the NEUTRAL position (mid throttle ) of the remote.
The Binding procedure is as follow:
1).Check and make sure all the wires are connected and that the REMOTE is OFF,insert the bind plug into CH3(Bind) on the RECEIVER.
2).With the REMOTE OFF. Switch on the ESC, to power up the RECEIVER, red LED light will flash.
3).PRESS and HOLD the bind button on the REMOTE and then turn the REMOTE ON.
4).You should notice the REMOTE and RECEIVER LED light go from flashing red to solid red.
5).Once you see a solid red light, the binding process is complete, Then without turning the REMOTE OFF or touching the THROTTLE pull the bind plug out (for the receiver to record the throttle mid point, neutral, to engage the fail safe)
6).Then you can test it again by turning OFF the REMOTE and the RECEIVER LED should flash. By turning the REMOTE ON the RECEIVER LED should go back to solid red.
Before RIDING ,it’s better to test the fail safe function in the RECEIVER ,if the motor didn’t move,so the fail safe function is in good working condition, if the motor is moving,you have to repeat the step No.1- No.6 above"