Those exposed nuts are supposed to have plastic covers over them... Chuck Hawley [email protected]
Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________ From: [email protected] <[email protected]> on behalf of Andy Durbin <[email protected]> Sent: Friday, May 22, 2020 8:24 AM To: [email protected] <[email protected]> Subject: Re: [Elecraft] A fluke may have fried my KX3 and KXPA100 I need advice "The most likely contact scenario would seem to be that the shell of the USB connector made contact with a grounded nut on the power supply. " I received an email that said Astron power supplies have exposed transistors that are not at ground potential. That prompted me to investigate the Astron design. Page 13 of this paper http://www.wb1gof.org/files/AstronPDF.pdf shows the bottom of the case has an exposed stud/nut with 13.8 VDC. It may be interesting to find out (by analysis) what the PSU does if this stud is grounded. If the output voltage goes high it could explain the KXPA100 and KX3 failures. Maybe someone already knows the answer. Andy, k3wyc ______________________________________________________________ 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] ______________________________________________________________ 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]
