Try checking solder connections in the lowpass filter area of the kpa100, especially the toroid leads. Often bad connections produce temperature-related problems.
Vic 4X6GP/K2VCO > On 13 Nov 2015, at 3:27 AM, wa4ywm <[email protected]> wrote: > > I originally posted this in July and I still have the problem. The issue is > as described below past the dashed line. Note that the issue happens even if > I haven't been transmitting. > > Don Wilhelm helped me attempt to troubleshoot the issue. We eliminated the > base K2 as the source. After that, at Don's suggestion, I installed the > KPA100 upgrade kit - no success. At this point we gave up. > > Recently I replaced D16 & D17 on the KPA100 after reading about similar > problems caused by the damaged diodes. Still no luck. > > Has anyone out there had a similar issue? > > 73, > Jim Elmore WA4YWM > > ------------------------------------------------------------------------------------------ > I have a K2 serial no. 4729 with the 100W amp which I have been using for > almost 10 years. > > It recently developed a problem with the following 2 symptoms: > > 1. After operating for some time (perhaps 1-2 hours) the Tune function will > begin to display 1 W with a 1.0-1 SWR on all bands. It normally displays > 22-23W with the correct SWR shown. > > 2. At the same time, if I attempt to transmit, the K2 will apparently begin > to draw too much current and it shuts down and re-starts. The Tune function > also shuts the K2 down at this point. > > I observed the same behavior on a dummy load - to eliminate an antenna or > feedline issue. > > I also left the power supply on while letting the K2 cool down to see if the > supply > was the source of the problem. Apparently not since the K2 would operate for > a significant time after turning the K2 back on. > > > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K2-w-KPA100-power-resets-after-approximately-2-hrs-of-turn-on-time-tp7610298.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > 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]
