Hello all:
I had disassembled my previously operational KX1 (SN854) in anticipation of adding the KXB3080 option. However I realized that it would be some time before I could get around to it, and I felt like operating. So I put it back together, powered it up, and released the smoke. Examination showed that a short section of V+ PCB trace just after the power switch had vaporized. PCB traces make excellent fusible links. I measured the resistance to ground from the far end of the trace. It was 1025 Ohms. By now I had a pretty good idea what was going on. I repaired the trace, and measured the same resistance at the power connector. So far so good. I powered it up outside of the case and all is well. Now I'm real sure what's going on. I reassembled it into the case, and measured the resistance at the power connector; 0.4 Ohms. Q6 was shorted to the case. I backed off the screw for Q6 1/8 of a turn and the short goes away. I examined the plastic spacer and it does not seem deformed. The insulating pad also seems fine. I did not torque the screw to 20 foot pounds. I don't know what to do next. All suggestions appreciated. Thanks, Paul N8NOV Houston _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
