The fastest fuse in the world is a transistor. Actually that's not quite true. Tunnel diodes are even faster but ICs don't contain TDs. Don your suggestions make good sense where massive currents have flown. 73 Fred, AE6QL
-----Original Message----- >From: Don Wilhelm <w3...@embarqmail.com> >Sent: Jun 20, 2014 10:48 AM >To: bwru...@gmail.com, Elecraft Reflector <elecraft@mailman.qth.net> >Subject: Re: [Elecraft] KRC-2 Possible Lightning Failure > >Brian, > >The best way to attack a KRC2 that has been subjected to a strong >lightning surge is to replace all the ICs (and possibly other active >devices). If you have a good desoldering tool it is not a difficult >task to remove the ICs. Lacking that, assume the ICs are bad and clip >the leads from the IC bodies and remove the pins one at a time. > >Wholesale replacement takes less time than trying to troubleshoot what >could be multiple failure, and is not really that expensive. > >73, >Don W3FPR > >On 6/20/2014 1:19 PM, Brian F. Wruble wrote: >> Hi all: >> >> I have had my K-Line (K3, KPA500, KAT500, P3) all working brilliantly, both >> local and remote using my new K3/0 Mini. >> >> While I was away, a severe electrical storm passed through the QTH in >> Maryland. I returned, moved cables around to get local operations geared >> up. The KRC-2 band decoder seems to have failed. >> >> I have 5 volts after the voltage regulator, U3, but I cannot get 12V at any >> of the "high side" driver outputs on J6, J7, J8 and J9. >> >> The unit communicates with the configuration program, and I have firmware >> version 1.6. I have re-loaded the firmware. >> >> What should I try next? >> >> Tnx es 73 de Brian W3BW >> >> *Brian F. Wruble, C.F.A. >> ______________________________________________________________ >> 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 w3...@embarqmail.com >> > >______________________________________________________________ >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 fptowns...@earthlink.net ______________________________________________________________ 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
