On Sun, 2008-07-13 at 18:26, Don Wilhelm wrote: > Steve, > > That certainly sounds like you have one of those rare occurrences - a > bad switch. It certainly can happen - actually most any part can fail > at times, but a bad switch is quite low on my list of usual suspects. > > 73, > Don W3FPR
I have a 20-year-old Advantest R4136 microwave spectrum analyzer that I acquired several years ago in non-working condition. The sympton was that every one of the fifty (!) pushbutton switches on the front panel did not work. Initially, I was sure it couldn't be that every switch had gone bad - it had to be a bad interface IC, unseated connector, malfunctioning microprocessor, etc. You guessed it - every single one of those 50 switches had indeed failed. (Confirmed by the fact that I could toggle each switch function by bridging each pair of contacts with a clip lead.) I ended up disassembling every switch, cleaning the internal contacts with a Q-tip dipped in alcohol and reassembling. It took me a couple hours to do all 50 switches. The instrument works great now. Al N1AL _______________________________________________ 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
