[Elecraft] KPA-500 270V ERR

[Andy Durbin]

Well if it were mine I'd check the voltage on the nominal 270 V connector on the PA module then work back from there.

I keep notes from discussion of other peoples problems and their resolution.  You can find all this in the archive but this is what I have in my notes for KPA 270 V problems:

<start file notes>

KPA500 270V failure:
(two post by  Dr. William J. Schmidt <bill at wjschmidt.com> )

There are two voltage Test Points "TP" on the board under
with the diodes and  you need to check the voltages on those test points.

Here it is.  From Elecraft technical support:

Nominally:

TP2= RX 13.1 TX 0.8
TP4= RX 3.9 TX 13

>From Rene Morris at Elecraft (great guy!).


and

Thanks for the reply but in my case the problem is the voltage multiplier
circuit on the power supply PCB. I just disconnected the HV (~70V) and 270V
lines so they did not go anywhere and the 270V line still only measures 85V.

Thanks
Bruce, WB6IZG


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 circuit for the 270V line.

Bottom line is my KPA500 is back in service.

Bruce, WB6IZG

<end file notes>

Good luck and let us know what you find.

73,
Andy, k3wyc