Keep in mind that the article I sent you is a complete refurb that even
replaces the pass transistors.
I think googling around said the most likely culprit is a bad LM723, but
I didn't look too hard since my Astron was working fine before I decided
it made a nice footrest and bought a switching power supply. :)
On Thu, 17 Oct 2013, Gary, W7TEA wrote:
Thank you Hisashi! I called Astron and they quoted $26US including shipping.
Gary
On Oct 17, 2013, at 2:26 PM, "Hisashi T Fujinaka [via Elecraft]"
<ml-node+s365791n757998...@n2.nabble.com> wrote:
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]" <[hidden email]>
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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Gary W7TEA K3 #1001, #5763
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BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte
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73,
Gary W7TEA K3 #1001, #5763
--
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BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte
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