[Elecraft] My K2 died.

[w3att]

Don,

Yes they are all on the control board. I have checked all input voltages to
IC's and all are good.

U1, pin 8 - 8v
U2, pin 8 - 8v
U3, pin 8 - 13.8v
U6, pin 1, 11, 32 -5v
U7, pin 8 - 5v
U8, pin13 - 5v
U9, pin 7 - 13.8v
U10, pin 4 - 8v



Don Wilhelm-4 wrote
> 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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