I just had a very similar problem at a customers K2: Without SSB board but jumpers and C167 set, all is ok. With build in SSB board ALC sometimes worked, sometimes not.
The failure was caused by a reversed Diode D2. Even if your Diode is not reversed, it may have a thermal failure. Also check transistor Q1 73 de Peter, DL2FI > -----Ursprüngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von Kevin Schmidt > Gesendet: Dienstag, 28. November 2006 19:10 > An: elecraft@mailman.qth.net > Betreff: RE: [Elecraft] K2 weird problem > > Others on the list know infinitely more than I do about how > the K2-KSB2 work, but from the symptoms, I would guess that > the KSB2 is loading down the VRFDET line so that the K2 > thinks it isn't generating enough power. > It then tries to up the power, gives the high current > warning, and drops back to 10 watts. This would suggest > checking the components around Q1 on the KSB2. > > 73 Kevin w9cf > > > > > Hello agn fellow Elecrafters, > > I still have a problem with my K2, upon cold startup. power cont. > > set to 5w. CW mode. when 1st x-mit . bargraph shows almost > no ind. but > > hi curent alarm, power out is 10+ watts( 40m) es after a > minite or 2 > > all is backto normal with bar graph showing 5w es power out > is 5w es > > no alarm. i followed Keith Darwins suggestion es made some rework > > eliminators. I narrowed the problem to when the ssb brd is > plugged in. > > with ssb brd out, all is fine. I went thru a rebuild of the > ssb board > > es all parts are in proper places es no cold solder joint > or bridges. > > Problem is with ssb brd. could my problem be a faulty > (intermittent) > > IC ??? > > Any sugestions appreciated. tnx, Gregg WB8LZG > > =------------------------------------------------------------- > Kevin Schmidt, [EMAIL PROTECTED], > http://fermi.la.asu.edu/w9cf Department of Physics Arizona > State University, Tempe, AZ 85287-1504 > (480) 965-8240 Fax: (480) 965-7954 > _______________________________________________ > 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 > _______________________________________________ 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
