[Elecraft] K3 PTT problem

[Pedro, EA4KD]

After a while not using my K3, today I have connected the microphone and the
PTT doesn´t work. Mic works perfectly with other equipment and previously
also on the K3. I have tried to work with the VOX and the same microphone
and the K3 goes to transmission without problems and the audio comes out
well. I've been going through all the K3 settings but I don't see where the
problem may be.

 

Any point where to start reviewing?

 

73 DX de Pedro, EA4KD