Actually four. There are two on the power supply board that protect the low voltage supply. Since the front panel appears not to be powering up, it is possible that one or both of these may be blown.
I don’t really have any suggestions for what might be wrong, so the best thing to do is to contact customer support. They are still rather busy, so it might take a little while for them to get back to you, but I am sure they will be able to help. Good luck, and hope we can help you get your KPA500 back up and running quickly! 73, Jack, W6FB > On Jun 5, 2020, at 11:41 AM, Bob McGraw K4TAX <rmcg...@blomand.net> wrote: > > You say you checked the "fuse" and it is OK. In fact, there are two fuses. > If either has failed the amp won't power on. Then check the voltage at the > outlet from where the amp is powered. > > If you don't know where to start looking,.........if the above two items are > OK, then I suggest sending an e-mail to tech support at Elecraft and ask for > a RA. Chances are the issue is beyond local repair, either by knowledge or > test equipment and parts. > > 73 > > Bob, K4TAX > > > On 6/5/2020 11:04 AM, Tom Berry wrote: >> I was operating on FT8 20 meters for quite a long time with my KPA500 >> running about 400 watts and heard a few pops (like something arching). >> Heard it a few more times then the amp went off. >> >> Now it will not power on. No lights, nothing. I checked the fuse and it is >> OK. >> >> Can you tell me where to start looking? >> >> >> Thanks >> >> Tom AAA4VV >> >> ______________________________________________________________ >> 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 rmcg...@blomand.net > > ______________________________________________________________ > 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 arch...@mail-archive.com
