[Elecraft] K3 suddenly dies

[Gary, W7TEA]

I have had the board off a couple of times to reseat and then to change out the voltage reg IC and to 
adjust the trimmer.  I have done a visual inspection but will check that all hardware is
securely fastened.  May have to invest in another assembled board if nothing else works.

Thank you all for the ideas.  

Gary W7TEA


On Oct 17, 2013, at 12:38 PM, "Vic K2VCO-2 [via Elecraft]" <ml-node+s365791n7579977h52 at n2.nabble.com> wrote:

> Sometimes the screws holding the board to the capacitors loosen up after a few years. 
> 
> On 10/17/2013 7:14 AM, Gary, W7TEA wrote:
> 
> > Good morning Don.  The PS suddenly died on me at our beach house in Long Beach.  I had 
> > no equipment there and first assumed it was my K3.  Brought the rig home to Portland 
> > and it worked fine.  So, it was the supply, an Astron RS35A--couple years old. Anyway, 
> > checked the fuse, cleaned contacts etc and it was .8v at the terminals. .  So, I 
> > replaced the voltage IC which I got from Mouser and used Deoxit on the the voltage 
> > adjustment pot.  I have another RS35A which has run fine for over 30 years. 
> > 
> > I don't feel comfortable playing around inside a live supply but will take the cover 
> > off and do another visual inspection while unplugged. It has to be something simple I 
> > would think. 
> > 
> > thanks Don,  Gary W7TEA 
> > 
> > 
> > 
> > 
> > On Oct 17, 2013, at 5:42 AM, "Don Wilhelm-4 [via Elecraft]" 
> > <[hidden email]> wrote: 
> > 
> >> You did not show any of the prior information (one of the problems with posts from 
> >> Nabble), so I can only guess that you are working with a power supply problem. A 
> >> situation like that is often caused by something loose in the negative side of the 
> >> supply, something that is frequently overlooked. 
> >> 
> >> 73, Don W3FPR 
> >> 
> >> On 10/17/2013 1:54 AM, Gary, W7TEA wrote: 
> >>> Well, traded out the voltage regulator IC and no joy.  Then I tried Deoxit on the 
> >>> adjustment pot, tweaked it a bit and measured voltage at 13.8vdc! Great! Turned it 
> >>> off and on, tried it again, and was ready start bragging to the XYL---but it was 
> >>> back to .8v.  Didn't see any suspect components while I had it open. 
> >>>
> 
> -- 
> Vic, K2VCO 
> Fresno CA 
> http://www.qsl.net/k2vco/
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-----
73,

Gary W7TEA  K3 #1001, #5763
--
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