[Elecraft] My K2 died.

[Don Wilhelm]

Brian,

I assume those ICs are all on the Control Board.
If so, it does sound like the MCU is gone.  The best way to check that 
is to substitute a new one.
However, some of the pins you measured are inputs to the MCU, so I can't 
be certain if that is the problem or not.
It is unusual for the MCU to just go "Poof".  Some more methodical 
measurements with the schematic in hand and a bit of logic would be 
helpful.  Do you have the proper voltage at the power input pins of each 
IC for starters.

73,
Don W3FPR

On 4/19/2015 10:07 PM, w3att wrote:
> K2 S/N 757 F/W 2.03d
>
> I was having some trouble with low power output through the K2 auto tuner..
> getting only about 1 watt or so into a dummy load.
>
> I had the cover off looking for any troubles. I disconnected the auto tuner
> and connected the dummy load to the ant out on the k2 and had full power out
> from there.
>
> While sliding the radio so that I could see inside a little better, the rig
> triggered tx and made a few dahs, go t real loud, then I heard what sounded
> like something short in the audio and smelled an odd odor.. this all
> happened within a second or two and it was too late.
>
> The entire radio shut down and I have no display, no relays click when I
> power on, no s meter etc.
>
> Checking inside, I do have power all through the power supply.. 8v and 5v to
> the MCU.. there, however, is where things go awry.
>
> No Tx or Rx. No power on pin 3, 6, 13, 19, and all other pins that should
> show 5v are either dead or showing only .1v or .2v
>
> I'm thinking the MCU? but I really can't figure out what caused it since
> nothing was touching bare wire when the catastrophe occured.
>
> Other symptoms include no voltage on U7 pins 1 and 2; U8 no voltage on pin
> 1, 9, or 11.
>
> I sure hope I can fix this.  This is my favorite rig.
>
> Brian W3ATT
>
>
>
>
>
> --
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