Bill, Sorry, that's about the only thing that comes to mind that you could try without some disassembling. I agree, it sounds like D28 is not the issue. I'd call Elecraft Tech Support tomorrow and I'll bet they can help you out.
Best wishes for a quick and easy fix! 73, Dale WA8SRA On 7/29/2012 7:16 PM, Dr. William J. Schmidt, II wrote: > Thanks for the tip... Measured about 995 ohms at the connector, so it > appears D28 is still intact. > > > Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ > > Owner - Operator > Big Signal Ranch > Staunton, Illinois > > email: b...@wjschmidt.com > > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dale Boresz > Sent: Sunday, July 29, 2012 6:07 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Dead K3 > > If you can, check the resistance across the K3 "12VDC IN" Power Pole > connections (after you've disconnected your Power Supply of course). > > On my K3, an internal zener-like diode (D28 on the RF Board) evidently gave > up its life to protect the radio from an overvoltage, and evidently the > failure mode is a short circuit. This diode goes straight to ground > immediately after the 6A inline fuse. I think the fuse is an auto-resetting > fuse, so you can probably assume it is still completing the circuit for the > purposes of your resistance measurement. If you measure a dead short, the > culprit is likely D28. > > 73, Dale > WA8SRA > > > > > On 7/29/2012 6:32 PM, Dr. William J. Schmidt, II wrote: >> So I was testing out my new K3 before I take it to J6 next week for a >> little DXPedition work. and after about an hour of operation.. it just >> quit. Dead as a door nail. has power to the back (checked) but never >> so much as the display activating. Any ideas? I SURE don't want to >> go back to that Flex >> 3000 that I had so much trouble with on PJ4.. >> >> >> >> >> >> Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ >> >> >> >> Owner - Operator >> >> Big Signal Ranch >> >> Staunton, Illinois >> >> >> >> email: <mailto:b...@wjschmidt.com> b...@wjschmidt.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 >> > ______________________________________________________________ > 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 > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1424 / Virus Database: 2437/5163 - Release Date: 07/29/12 > > ______________________________________________________________ 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
