Thanks to the 2 people who replied. Thanks to Keith VE7KW who had R16 (100
Ohm) SMD resistor fail on his PS board in his KPA500. I had the same
problem here. R16 tested open. It does not appear to be cracked or burnt,
just a failure. R16 appears to be a resistor that feeds the voltage
multiplier
com
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 270V Failure
OK, I see what you're saying now. I might have 2 problems. 1 or more diodes in
the PS board and the TR switching diodes. I will make the check you stated.
Thanks for the tip.
Bruce, WB6IZG
On Sat, Jul 24, 2021 a
> Moderator – North American QRO Group at Groups.IO.
>
> email: b...@wjschmidt.com
>
>
> -Original Message-
> From: Dr. William J. Schmidt
> Sent: Saturday, July 24, 2021 10:35 PM
> To: 'Bruce Forsberg' ; 'elecraft@mailman.qth.net
> '
>
> Subject: RE: [Elecra
b...@wjschmidt.com
-Original Message-
From: Dr. William J. Schmidt
Sent: Saturday, July 24, 2021 10:35 PM
To: 'Bruce Forsberg' ; 'elecraft@mailman.qth.net'
Subject: RE: [Elecraft] KPA500 270V Failure
This happens a lot... search the forum for past msgs. It's not the HV power
sup
This happens a lot... search the forum for past msgs. It's not the HV power
supply that is the problem. That power supply powers the PIN diodes for TR
and RX... and it is more likely that the PIN diodes shot craps and shorted
the power supply. There are two voltage Test Points "TP" on the board
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