[Elecraft] [K3] Sudden failure of line-in?

[Joe Planisky]

Hey Folks,

Fired up my K3 and Fldigi today for an Olivia sked and immediately noticed that I was not getting any RF output.  This same setup was working fine 2 weeks ago.

Switched the meter to show ALC and saw no indication where I usually get 5 bars.  I could hear the Olivia tones in the speakers, so I know the audio was getting from my sound card into the K3.  Tried adjusting the mic (line) gain and I can hear it making a difference in the monitor audio, but still nothing on the ALC meter. 

I'm running firmware version 4.22.

I verified I am in DATA / DATA A mode.

I verified I am not in SPLIT with VFO B set to a different mode.

I verified the rig is actually going into TX (i.e. the red TX light comes on)

I verified I have filters configured for use in DATA mode.

I verified that CONFIG:TX ALC was set to ON. 

I verified that SSB mode works with a mic plugged into the rear mic jack and MAIN:MIC SEL = RP.L.

SSB mode does NOT work with MAIN:MIC SEL = Line In.

I saved my configuration, did an EE INIT, restored the configuration.  No difference.

I did another EE INIT without restoring my configuration.  No difference.

I went back to beta 4.17. No difference.

I went back to beta 4.10. No difference. 

What am I missing?  Any other suggestions before I send an email to k3support? 

73
--
Joe KB8AP