Magnus that good news. Especially even having 3 X 5065s. I really need to look at the a15 to see what caps you are talking about. Then check my single 5065 and make sure I am not headed in your direction. regards Paul WB8TSL
On Mon, Oct 3, 2011 at 5:54 PM, Magnus Danielson <[email protected] > wrote: > Fellow time-nuts, > > I wanted to bring you an update on the HP5065A revival project. > > I have three units, unit A, B and C. > > For unit A I have been able to achieve lock, unit B had a PSU failure and > so did unit C. The PSU of unit A is about to fail, but I will fix it up. > > I have now done some work on the A15 board of unit B, repaired traces and > replaced 4 caps. It still provides a heavy load which makes the +20V supply > "duck" to 8,70V, as it goes into current limiting. Interestingly enough this > is limited to the PSU board itself. To test this theory I borrowed the A15 > board from the unit A into unit B, and using my experience of trimming up > unit A I was able to get unit B to lock up and even lit the Continous > Operation lamp. > > So, now I have both unit A and unit B locking up for me, but I will have to > work more on the A15 assembly for unit B in order to get them operational at > the same time. However, it will be much more rewarding to work on that board > now that I know that it is about the only thing I need to fix, and I've > already come a bit down the road on that one. > > Unit C also has the A15 board failure, but it failed even more spectacular, > so I will need to replace the zener diodes as the acid took one of the zener > diode legs with it... :P > First degree cleanup has been started. > > I will also need to replace caps on A15 on unit A, as they are about to > fail. However, running shorter batches should be fine for the moment, > especially as I cab down and get additional convection. > > Anyway, it is quite rewarding right now. I just couldn't avoid sharing some > of the progress. Hope it doesn't add too much to the noise here. > > Cheers, > Magnus > > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
