[Elecraft] KPA 500 HV Problem

[Andy Durbin]

The 270 V fault refers to the voltage that is used to bias the pin diodes in the T/R switch.   That voltage is derived from the same transformer tap as produces the nominal 60 V supply.  When I built my KPA500 kit I measured the voltage and found it was much lower than 270.  Customer support told me that was normal and I have never seen a 270 volt fault.

I'd have no problem removing the top cover and holding the micro switch closed while I measured the actual voltage on the 270 V connector.  I can't suggest that you do that.  Perhaps a careful visual inspection of everything you touched when you had the cover off?

73,
Andy, k3wyc