No output signal to ESCs

I`v had a problem since buying my new APM 2.5, the ESCs beep every 2 seconds.  This shows an abnormal output.  I have tried calibrating the ESCs and reloading the firmware 20 time and still no joy. I have just tested the output with an ociliscope and found there is no output signal.  I tested the output from the RC reciever first and thought I should get a similar square wave pattern.  Unfortunatly all I get from the APM is a straight line on all the outputs. I have looked at the data from MP and all looks good with data changing as I tilt the quad on all outputs.

I am powering it from the ESC BECs but for some reason I only get 4.63V at the input end of the APM. Is my board fried and I need a new one ???

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  • In regards to the 4.63V:  Most ESC's only output approximately 5V. In reality it's usually a bit lower. You could try using a dedicated UBEC instead - they tend to be closer to the 5V mark.

    For the lack of outputs: The APM will only output to the servos if it is armed.

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