[Elecraft] K3 suddenly dies

[Hisashi T Fujinaka]

I have an Astron 35A and was fishing around for details and found a guy
who talked about replacing the circuit board. I'm not sure it's
necessary, but here's the link:

http://www.repeater-builder.com/astron/pdf/w5bwc-rs35-rebuild.pdf

On Thu, 17 Oct 2013, Gary, W7TEA wrote:

> 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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-- 
Hisashi T Fujinaka - htodd at twofifty.com
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte