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Author Topic: Busted Pyramid ps-26KX  (Read 471 times)
W9DML
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Posts: 3




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« on: December 29, 2007, 11:31:32 AM »

Blows a 5A fuse at turn-on.
Is there  any history on this problem ?
 BTW NO LOAD

daVe
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W6BR
Member

Posts: 59




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« Reply #1 on: December 29, 2007, 12:57:39 PM »

Sounds like you have either a faulty SCR (crowbar circuit) or a shorted capacitor.

No, this is normally not a problem, unless one had a short somewhere and that protects the radio!!

Good luck,

Ron, W6BR
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AG4RQ
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Posts: 301


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« Reply #2 on: December 29, 2007, 07:54:11 PM »

I have a Pyramid Phase III PS-25. When I fried the SCR, the breaker kept tripping every time I would turn it on. The SCR had a dead short. When I removed the SCR, the power supply functioned as normal. I put a new SCR in and the PS was as good as new.

Try removing the SCR. If the power supply functions as normal, you know what to replace. Do this just to test it without the SCR. Don't use the power supply without the crowbar circuit. If you need an SCR, wait until you put the new one in before you use the power supply again.

73,
AG4RQ
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AG4RQ
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Posts: 301


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« Reply #3 on: December 29, 2007, 07:58:24 PM »

One more test you can do is a continuity check between the + and - terminals. If it shows zero ohms, it's probably a shorted SCR.

73,
AG4RQ
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