[time-nuts] Rpair of an 8662 HP Generator

[paul swed]

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 at febo.com> wrote:

> Thanks
>
> Sent from my iPhone
>
> On Apr 15, 2016, at 6:38 PM, "John Miles" <john at 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 at 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 at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>