[Elecraft] Strange K3 microphone /PTT fault

[john petters]

Greetings folks,
I'm puzzled. my 7 year old K3 did two strange things this evening.

During a CW QSO on 21MHz, it appeared not to go back into receive and
required power off and on to operate. The QSO finished.

Then, in the middle of a USB QSO on 5MHz - mid transmission, it went
back to receive and the PTT would not go back to TX, nor did the Vox work.

I can operate the PTT on the back socket of the rig, and by grounding
pin 2 on the 8 pin mic connector.

On measuring the pins 7 & 8, which should go to ground, these seem to be
floating and not grounded.

I've just looked at the circuit and it shows these pins going to ground.

Any suggestions?

73
-- 
John Petters
Amateur Radio Station G3YPZ
www.traditional-jazz.com