Ulrich To your first question I am unaware of anyone that repairs them. Though there are many places that might, typical cal and repair shops. I have a sick 8662 also (age) and need to dig in. At least I know the board and the most likely issue. The yahoo user group has a lot of useful details. Regards Paul WB8TSL
On Fri, Apr 15, 2016 at 7:08 PM, Dr. Ulrich Rohde via time-nuts < time-nuts@febo.com> wrote: > Thanks > > Sent from my iPhone > > On Apr 15, 2016, at 6:38 PM, "John Miles" <j...@miles.io> wrote: > > >> My signal generator has a poor, intermittent power supply. The RF > >> section is ok. Who can please tell me which company can and will fix > these > >> older > >> but excellent generators? > >> > >> Thanks, Ulrich > > > > Have a look at the capacitors in the voltage divider that drives the > bases of the switching transistors. There's a good chance that's your > problem, and they probably need to be replaced even if not. 75-TVA1607 > (Mouser p/n for Sprague TVA1607) works well. > > > > It would be nice to use 105C parts if you can find some, but the 85C > TVA1607s have worked well for me in multiple 8662As over several years. > > > > The other likely suspect is one of the large screw-terminal > electrolytics on the motherboard. The power supply can > almost-but-not-quite start up when one of those is completely open. High > ESR is very likely to cause intermittent operation. > > > > -- john, KE5FX > > Miles Design LLC > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.