[Elecraft] K3 suddenly dies

[Philip Carter]

Discharge the cap BEFORE trying to tighten or loosen the screws.





________________________________
 From: Vic K2VCO <k2vco.vic at gmail.com>
To: elecraft at mailman.qth.net 
Sent: Thursday, October 17, 2013 3:37 PM
Subject: Re: [Elecraft] K3 suddenly dies
 

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]"
> <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.
>>>

-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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