Hi Don, Yes, it does have a good pad and is properly attached to the heatsink. I was upgrading the KPA and re-soldered both Q3 and U1 temperature sensing contacts as well as verified that Q3 installed properly. But that did not change anything.
73, Arkady On Dec 1, 2020, 11:18 AM -0800, Don Wilhelm <donw...@embarqmail.com>, wrote: > Arkady, > > Is Q3 properly seated on the heatsink with its thermal pad and mounting > screw? That is the device which senses the temperature. > > 73, > Don W3FPR > > On 11/30/2020 5:00 PM, Arkady via Elecraft wrote: > > Hello, > > > > I wonder if anybody had similar problem. > > When I “run” I get fan starting running after 10-15 minutes. However after > > another few minutes of running the fan will shuts down every time I press a > > key ( I am CW op). As a result the temperature of the PA goes higher and > > higher and at certain point the PA shuts down. If I check the temperature > > reading through temperature calibration in the menu I see that temperature > > reading jumping force and back with range of readings 10 - 20C. That kind > > of erratic temp reading continues even when temperature of the heatsink > > goes down. If let the trcv to cool (overnight) the temperature readings are > > stable with range of reading +- 1C. > > ______________________________________________________________ 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
