I recently had Q6 on the LPA board fail shorted, in which case you will get no power out at all. It's a MOSFET and very prone to an ESD event since it is on the antenna. Check gate-to-source resistance with an ohm meter. Should be 800 or so ohms. 73 N7RT
----- Original Message ----- From: "Randy Moore" <wrmoor...@comcast.net> To: "Elecraft Discussion List" <elecraft@mailman.qth.net> Sent: Friday, January 07, 2011 7:45 PM Subject: [Elecraft] [K3] Err 12v >I am working on an friends K3 (#4446), recently purchased used. When I > got it, Power-On resulted in "ERR DSE." Firmware load failed, so I did > EEINIT, and then the firmware (4.22) loaded correctly. After going > through filter setups to match the on-board filters, things seemed to be > working correctly. But then I tried to increase power beyond 12w, and > now I get the "ERR 12V", which my friend had seen before. When that > error occurs, the KPA3 fans come on. The manual says to reset the > circuit breaker, but it wasn't tripped. Just for kicks, I tried to do > the Tx Gain Calibration through the K3 Utility (dummy load attached), > and even at the 5w level, it fails. > > I need some advice on how to proceed. > > Tnx es 73, > Randy, KS4L > ______________________________________________________________ > 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 ______________________________________________________________ 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
