[Elecraft] K2 resetting itself

[dyarnes]

Chris and All,

I had a power on--power off problem some time back.  I think several others 
had a similar issue.  My problem was traced to the I/O board.  I believe 
this has been fixed, and later units don't have the problem.  Not sure what 
your number is though.

I suggest you contact Gary or Rene at Elecraft.  They are pretty sharp, and 
I bet they can get you fixed up quickly.

Dave W7AQK


----- Original Message ----- 
From: "Chris Kantarjiev" <cak at dimebank.com>
To: <elecraft at mailman.qth.net>
Sent: Monday, March 23, 2009 8:27 PM
Subject: [Elecraft] K2 resetting itself


>I was happily monitoring 14.058 this afternoon when my K2 turned itself 
>off.
> I cycled the power button and it came on enough to say ELECrAFT and to
> hear a little audio, and then shut down. Then cycling the switch didn't
> do anything. Or would do a little.
>
> I figured it was causing F1 to reset. Put it on the bench and sure enough,
> it's drawing about 5.6A ... the manual is not terribly helpful about
> diagnosing.
>
> I opened it up and started removing boards. Can't really find anything.
> It would have been too easy if something in the battery charging circuitry
> had shorted ... With the switch "ON", +12V shows 105 ohms to ground.
> That can't be good.
>
> I'm not really sure how to diagnose this. The PA transistors seem
> like a place to start: the emitters are grounded, when the switch
> is OFF, the collectors have about 100 ohms to ground (can that be
> right?) , the base about 134 ohms.
>
> Suggestions would be quite welcome.
>
> 73 de chris K6DBG
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