Don, Is U1 installed the 'right way around'? The voltages you measured with U1 removed seem to be correct for that condition. You may have a faulty U1 on your hands.
73, Don W3FPR > -----Original Message----- > Hi Guys, > > I seem to have K2 #5885 perking along quite well. I also installed > the NB, DSP, SSB board and 160 board. With those behind me, I'm on to > the KPA 100. > > On my initial voltage checks, page 25 of the manual, I'm getting some > bad readings. > > Test Point Reading Should be > U1 pin 1 7.0 5.0 > U1 pin 7 8.0 0 - 0.1 > U1 pin 13 7.0 0 - 0.1 > U1 pin 20 7.0 5.0 > U1 pin 27 7.6 5.8 > > U4 pin 11 5.8 5.0 > > I pulled U1, and all readings were within spec except for > > U1 pin 7 13.1 0 - 0.1 > U1 pin 27 8.0 5.8 > > So, it seems that voltage regulator U3 is OK, as it reads 5.0 with U1 > out of the picture. > > Could I have a bad Q12?, or is it possible U1 is the culprit, or ???? > > Thanks > > Don > W0DJC > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.29/608 - Release Date: 12/29/2006 8:22 AM _______________________________________________ Elecraft mailing list Post to: [email protected] 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
