Problem is definitely the interlock switch not being engaged correctly: if I close it manually (with a wooden rod!) the amp operates normally.
Anyone have an assembly manual for the older type KPA500, so I can see how the top-panel interlock switch is supposed to be engaged? Again, this a fairly old amp, and Elecraft changed things in later versions (like the one covered in the assembly manual currently on the website). Thanks! Tom W4KX > On May 3, 2020, at 3:21 PM, Tom Doligalski via Elecraft > <elecraft@mailman.qth.net> wrote: > > Hi Jack! > > After cycling the main power the HV in standby is back to 70 V. But, every > time I go to operate mode, the error reoccurs. > > This is with what I believe was the old style interlock switch (has a shaft > attached to the top cover to engage the switch when the top is screwed down). > Can’t tell if it is properly engaging. But the behavior is the same when the > top cover is totally removed. > > How picky is this switch. I bought the amp used, and the assembly manual > online at elecraft doesn’t cover the old interlock switch. > > Thanks for your help! > > Tom W4KX > > Sent from my iPad > >> On May 3, 2020, at 3:06 PM, Jack Brindle <jackbrin...@me.com> wrote: >> >> A “270V ERR” fault indicates that the TR switch bias supply is not working. >> This may be caused by the top cover being removed, the safety switch >> attached to the top cover becoming loose or an actual failure of the 270V >> supply. Since your main HV supply is now down close to 0V, it looks like you >> have power supply issues. You should call technical support on Monday to get >> help. >> >> 73 and good luck getting your KPA going again. >> Jack, W6FB >> >> >>> On May 3, 2020, at 11:32 AM, Tom Doligalski via Elecraft >>> <elecraft@mailman.qth.net> wrote: >>> >>> My KPA500 has been working fine waited for 115 V. Just now it has been >>> throwing a “25=70 VAC” fault! >>> >>> Can anyone lead me in helping this? Fuses look good. HV read 0.1 v when in >>> standby, which is FAR from the 70 some volts it used to read. >>> >>> Thanks! >>> >>> Tom W4KX >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to jackbrin...@me.com >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w...@mac.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
