[Elecraft] K3 suddenly dies

[Mark]

Sounds like you could be tripping the over voltage protection.  When there is no other
fault the current limiting built into the supply folds the current back so that it does not
blow the fuse.  You can disconnect the wire going to the scr that is the OV clamp and see
if it's ok.  You can then troubleshoot the OV circuit. 

Mark. N2QT

> On Oct 17, 2013, at 10:14 AM, "Gary, W7TEA" <gtuck at mac.com> 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]" <ml-node+s365791n7579965h80 at n2.nabble.com> 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.
>> 
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> 
> 
> 
> 
> 
> -----
> 73,
> 
> Gary W7TEA  K3 #1001, #5763
> --
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