[Elecraft] K3: R-MH2 mic problems

[VE3NFK]

Hi I have sn 709  - I have my Heil HC4 from my TS-2000  8 pin conn - when I
plug it into the K3 - I hear noise from the MICROPHONE???   

The 'manual' says:  " to select front or rear panel microphone AND to turn
BIAS on/off, use the MAIN:Mic SRC menu entry..

My firmware 1.78 only shows:  MIC SEL      FP.H b1 A5 and I have not figured
out how to adjust it - the main VFO knob also gives me a choice of rP.H and
LInE  In   ..

On a separate note  - I have this anomaly that I emailed support on Friday
night:

"Managed to 'lock-up' my K3  - NO buttons work - including power - had to
pull the power plug....
going thru the config menu  - at PTT-KEY  both ' OFF-OFF'  tried to change
values and complete lockup
Completely repeatable  - go to config PTT then  move main vfo control and
lock up.
Was on AM 13840 listening to a SW station/
Changed mode/freq  - still does it - as soon as main VFO adjusted.  "

Any advice/help comments?

tnxs

John VE3NFK



Gary Hembree wrote:
> 
> This is a known problem with the Rev B front panel artwork.  I had the
> exact same problem with a MH2 mike when I first used my K3/100 SN 729 a
> week ago on 6 meters to contact a local friend who is a well-known VHF and
> HF DXer and contester.  Unfortunately it did not make a good impression! 
> There is a ground trace missing from one end of C98 and C97 on the front
> panel board.  These capacitors are associated with the mike bias circuit. 
> Hence the problem with the MH2.  I am told that an official Elecraft fix
> is going to be released this coming week.  Several of us who noticed this
> problem were given the fix to try and it worked three out of three times. 
> If you must use a mike that needs bias then use the rear panel connector
> for now (i.e. Elecraft or Icom Proset).  MH2s are excluded of course,
> unless you have an appropriate adapter.  688 is the earliest SN that we
> know is affected.  The other three were 690, 728 and 729.  Elecraft is
> fixing front panel boards now before they ship anymore.
> 73
> Gary, N7IR
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