Hello,
APM 2. In calibration mode. Firmware ArduCopter 2.5.3.
APM input channels 1,2,3,6,7, and 8 move as expected with output from receiver.
Channel 4 and 5 inputs appear to be tied together.
APM 2 input channels 4 and 5 display the same value output from channel 4 (rudder).
APM 2 input channels 4 and 5 display the same value output from channel 5 (rudder output moved from input 4 to input 5).
Confirmed by connecting one cable from receiver channel 4 to input channel 4. Input channels 4 and 5 move together. All other channels 1,2,3,5,6,7, and 8 disconnected.
Confirmed by watching flight modes change as channel 4 values changed.
Thanks for your comments.
Replies
Input signal pins 4 and 5 have continuity (and they shouldn't).
Assumption: circuit board or surface mount chip leads have short circuit.