Jonathan, I can understand Q1 and Q2 getting hot from a shortcircuit somewhere on the 8T and 8R lines, but I just don't understand how Q3 and Q4 would get hot - they are just switches and should be fully conducting or fully non-conducting (and therefore should dissipate very little heat). Start by checking resistances on the 8T and 8R lines and search for that elusive solder bridge that I suspect is somewhere on the RF board or the Control Board.
After you cure the cause of Q1 and Q2 heating excessively, you can move on to the VCO problem if it still exists. 73, Don W3FPR > -----Original Message----- > > I am building K2 4856. I've run into a real problem. All tests > have gone great until the VCO Oscillator. In doing the VCO > Oscillator Test I get a reading of 00000 AND Q1, Q2, Q3 and Q4 on > the Control Board all got very hot. Hot to the touch. Not sure > where to go with this one. Any suggestions? > > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
