[Elecraft] K2 RF board resistance check - RYCOM

[Charles Vollum]

Thanks guys.  I cut around the top of the C207 pad, and that did the 
trick.  After patching the cut runs on the bottom, all resistance tests 
pass fine.  I just hope that there aren't any more of these on other 
pads.  Time will tell; meanwhile it looks like 3632 is back on track!

Cheers,

Charles N7BPT

On Monday, July 28, 2003, at 09:20 AM, Don Wilhelm wrote:

> You have good eyes Andy!!!
> Sounds like Wayne and Eric need to pound a bit harder on the board 
> vendor -
> the last I heard, Elecraft is paying for a complete 'bed of nails' or
> similar test on all boards - which should have picked this up.  I 
> think this
> is the 2nd or 3rd report of a similar short over the past couple of 
> months.
> Stuff like this happens and fortunately it is not that common.  Sorry 
> it
> happened to you.
>
> 73,
> Don W3FPR
>
> ----- Original Message -----
>
> I sent Charles a direct reply but am sending this one to the List.
> People, take a look at his shots, and click on the right hand
> one to enlarge. That's the top side.
>
> Now look very carefully at the highlighted hole. The bright silver
> (tinned) pad looks great, but the green solder mask covers the area
> around it. See how there's a bulging "halo" of copper underneath
> in the 7:00 - 8:00 position?
>
> Now look carefully at the 1:00 position. It looks like there's a 
> similar
> bulge, except this one is big and sure looks like it's touching the
> ground area nearby. I bet that's where the short is. I told Charles
> to scrape the point of an x-acto knife around the pad.
>
> This photo is a great example of what can crop up occasionally.
> I will say (and most would agree) that the Elecraft boards are
> great quality and this kind of thing is probably extremely rare.
>
> I built a Ten Tec 30m QRP kit several years ago and had a similar
> short, which was not only under the solder mask, but it was under
> the silkscreen for the component outline! Troubleshot to the pin
> and eventually found it.
>
>
>
>
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----
Charles Vollum
http://xsw.com/boojum -- Boojum, a trailerable offshore tug yacht