John, Either remove T3 or remove the PA transistors and see if it comes back to life. If it does, then replace the PA transistors. A dropped wire that happens to short between the collector and the base of the PA transistors will take them out in a microsecond!
73, Don W3FPR On 11/7/2011 4:54 PM, ke4d wrote: > Ok, I've done a lot of dumb things in 37 years of amateur radio but when > constructing my second K2 a few weeks ago, I dropped a piece of component > wire on the RF board while doing the second power up test on the receiver. > Bam, no power at all, no lights, no relays nada. I thought I blew D10 on > the RF board but Elecraft tells me it leaks anyway. I changed it > nonetheless, no joy. I get 12 volts on the main bus on the RF board until I > hit the power switch. Then the voltage drops to 2.5 or so. I lifted the 5 > and 8 volt regulator output leads, still low voltage there. Changed them > also but still no joy. I'm at a loss where to look next. I cannot find > anything that warms up, looks bad, measures the wrong resistance, just low > voltage. Low enough that the relays don't activate and the display is a > dismal green with no power to it. Any suggestions other than buying another > Icom or Kenwood? I could say the rig is KOA instead of DOA since I killed > it! > > John KE4D > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K2-DOA-at-second-power-up-test-tp6972220p6972220.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
