K2 Resistance Checks

[Tom Field]

I've reached the stage in K2 construction for the first resistance checks
on the  RF Board. Everything comes into spec except the 8b signal on U6 pin
8 measures 38.4 ohms to ground and the spec calls for > 100 ohms. Any ideas
where to look?

Tom
KI6NRD
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[Mike K8CN]

Tom,

You're not the first to encounter this particular anomaly.  Don, W3FPR had these suggestions for another builder, the link to which I've included below.

http://elecraft.365791.n2.nabble.com/K2-RF-Board-resistance-check-failure-U6-Pin-8-tt7559095.html#a7559102

73,
Mike, K8CN

[Don Wilhelm-4]

Tom,

You will have to begin lifting resistors and inductors if you cannot
find a solder bridge by inspection.  If you end up doing that, do it in
an orderly fashion and keep notes as you work - in the heat of
troubleshooting often the thought comes up which says "did I try that
already?" - notes will help with that question.

As Mike K8CN indicated, take a look at
http://elecraft.365791.n2.nabble.com/K2-RF-Board-resistance-check-failure-U6-Pin-8-tt7559095.html#a7559102 
and see if you can locate the fault using that procedure.

It is very unlikely that you have a bad component, but you should verify
the value of all resistors that are connected to the 8A and 8B voltage
rails.

73,
Don W3FPR

On 4/27/2013 5:44 PM, Tom Field wrote:

> I've reached the stage in K2 construction for the first resistance checks
> on the  RF Board. Everything comes into spec except the 8b signal on U6 pin
> 8 measures 38.4 ohms to ground and the spec calls for > 100 ohms. Any ideas
> where to look?
>
> Tom
> KI6NRD
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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