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 On Sat, Jul 24, 2021 at 8:36 PM Dr. William J. Schmidt <[email protected]> wrote: > 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!). > > > > Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ > > Moderator – North American QRO Group at Groups.IO. > > email: [email protected] > > > -----Original Message----- > From: Dr. William J. Schmidt <[email protected]> > Sent: Saturday, July 24, 2021 10:35 PM > To: 'Bruce Forsberg' <[email protected]>; '[email protected] > ' > <[email protected]> > Subject: RE: [Elecraft] KPA500 270V Failure > > 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 > under > with the diodes and you need to check the voltages on those test points. > That will tell you everything you need to know. Will post the voltages > when > I find them. > > > Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ > > Moderator – North American QRO Group at Groups.IO. > > email: [email protected] > > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
