K3 goes into transmit state

[Elecraft mailing list]

My k3 (427) goes  into the transmit state when I connect the cable from the Kpa 500 . This has never happend before .
I have downloaded recent firmware for k3/kpa500/ ,disconnected p3 ,to try and correct issue and still the same . 
Screen shows "PTT" err .  Config set at -  Ptt off-off .  Any suggestions

Thanks
 
Mark 
W1VJ
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