[Elecraft] K3: No modulation from front panel mic jack

[Bob W4ZY]

This is a fairly new K3 and I am finally getting around to checking it out after what I thought was an uneventful assembly.

CW works fine. Have not tried data.  However, SSB from the front jack does not work.  I am using Elecraft MH-2 microphone.  MIC SEL is set to FP.L bIAS.  Microphone works fine on my K2.

Have also tried a Heil HM-4 with what I believe is the proper adapter.  I can key the transmitter, but once again no audio.

I plugged a gaming headset into the back and got some audio, but I can't speak for its quality.

Does anyone have tips on what I could look at or further testing?

Thanks and 73,

Bob
W4ZY