Hi, I followed discussions about this but still can't get it to work. I have brand new ESCs and the one on APM CH 2 beeps every 2 seconds, ESCs are jDrones AC30-1.0 and from the manual it says throttle signal abnormal. I have connected the ESCs (one by one) directly to the APM to eliminate the PDB as a culprit but still no joy and swapped CH2 ESC with CH1 ESC and the one on CH2 beeps again even with a different ESC. I have connected the same ESC that is beeping directly to the RX throttle and managed to calibrate and without beeping. it seems like whichever ESC I plug into channel 2 of the APM doesn't work, so my newbie mind tells me its the APM.
The APM came out of a Skywalker with successfull flights and yes I did reset after uploading the Arducopter firmware ( uploaded and reseted twice).
Any help would be appreciated
Thanks
Replies
Figured it out.... Most probably I connected 5V to signal and Pos ( top two instead of bottom two) and after some track hunting with a microscope I got to the CMOS Multiplexer chip 47ACT157. Tested all 4 channels and found that CH2 output was shorted to pin E where the other 3 outputs where not. Replaced the Chip for less than 6 EUROS and I'm a happy flyer again.