Mike, U3 pin 6 is the output voltage of the 8 volt regulator - it is lower than usual, but not in excess of the regulator specs (+/-10%). Pin 5 is an output from U3 and will depend on the voltage applied to pin 6. So bottom line - all is OK.
73, Don W3FPR Mike Clarke wrote: > Hi all, > > Having received and fitted the replacement voltage regulator that > solved my previous K1 problem, I've moved on to the first DC checks on > the RF board (page 30 in my manual.) > > I'm performing the checks with the board connected to a stable supply > at 13.8 volts. > > The first two checks pass fine, but the second two state that I should > be reading between 3.8 and 4.2 volts on U3 pin 5, and between 7.6 and > 8.7 volts on U3 pin 6. I'm actually measuring 3.66 volts and 7.54 > volts, respectively. > > Normally these might count as 'close enough', but given the quality of > the manual (and my soldering!) I'm inclined to think I've gone wrong > somewhere! Can anyone offer a suggestion as to what I might have > done? > > ______________________________________________________________ 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
