[Elecraft] [K3] front mic not working after subRx install

[Stewart Baker]

Mike,
Make sure that BOTH connectors between the front panel  and DSP 
boards are mated. If you leave the one with the single row of pins 
unmated you will get the problem of the front mic socket not 
working.

Trust me - I have done this TWICE !!!

73
Stewart G3RXQ
On Mon, 12 Jan 2009 15:18:38 -0800, Mike Scott wrote:
> I installed the second receiver in my K3 and at the same time 
made the
> prescribed audio and line out modifications.
>
> After checking out the receiver my microphone is now dead using 
the front
> panel. Rear connection works okay. I have been using the front 
panel
> microphone connector without a hitch up until the time I went 
off line to
> make the above modifications.
>
> So has this happened to anyone else and is there something 
obvious before I
> start taking covers off?
>
> One thing to note, I did have a problem with the SubRx install. 
The Sub-In
> and Sub-Out board connections to the SubRx are very difficult to 
tell when
> they are mated correctly as most of the pins are not visible. I 
apparently
> ended up with an improper mating and smoked the sub-out board. A 
quick call
> to Elecraft identified the problem and a new sub-out board put 
me on the air
> after a very careful inspection of the connectors this time. I 
am wondering
> if the sub-out is the only thing that I smoked now. The 
microphone-audio
> path seems quite remote from all this activity but I don't know 
what sneak
> paths I might have created with a misconnected sub-out 
connection.
>
> I checked microphone gain (it is set at 30 with front 
panel-high, no bias),
> just as it was before this problem arose. Those mic settings 
work well for
> the rear connector using the same microphone. I use one of those 
Kenwood
> adapters to audio plugs that came with a microphone and the 
microphone has a
> dynamic element.
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> K3-100 #508/ KX1  #1311
>
>
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