[Elecraft] K2 control board U3 'hot' question

sbm at ottix.net sbm at ottix.net
Sat Jul 21 21:45:35 EDT 2007


Hi all,
 	Just wanted to say thanks for the feedback on this, problem 
solved.  Checking under some pins at U3 revealed a short.  All is well 
now, and it's on to building the RF board, Part I.

Thanks again,

Will

On Thu, 19 Jul 2007, sbm at ottix.net wrote:

> 	Just got myself a K2 (yay!) as it sure makes for a very nice rig and 
> kit to build.
>
> 	I've just completed the control board, front panel and the minor 
> assembly on the RF board.  Upon power-up, there's NO smoke (yeah!) but...
> I did notice that the area of the control board where U3 is located seemed 
> hot.  At first I thought this was attributed to the regulators directly below 
> it.  Instead, I'm now feeling (and I mean feeling!) that U3 is pretty hot.  I 
> managed to just run the DISPLAY test to fetch the voltage and saw it show "E 
> 17.8 i .68"
>
> Now, I did test the power supply, and it's happily putting out 13.8V all the 
> way through the RF board.  But it looks like a simmering U3 and the display 
> are pointing to something wrong with the voltage and current sensing 
> circuitry.  Am I on the right track?



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