futaba skysport 6a - xmitter stopped working

[baud2]

made zener/resistor cable, used scope found signal pin 3 & and ground 6 - connected up, FMS not work - try other pin 4 then pin 2, no work. Now xmitter doesn't put out antenna signal and doesn't work gas plane servos. What have I done - how can I fix ?? Steve had wrote that shorting 1 & 2 blew a FF8. Thanks, Bud

[baud2]

quess nnobody knew what to do with this one. After taking apart uint and inspecting the PC board I found a schotze dual diode burned out which protects the buddy system from reverse spikes. installed new diode $0.69+shipping from digi-key and it is just like new.