Other thing I have noticed is that some wires simply rot off. I think it may be the flux that eats the wires after 20 years or so.
On Sat, Sep 10, 2011 at 1:26 PM, J. Forster <[email protected]> wrote: > That is not a unique incident. > > I'm interested in LASER Interferometry. Attached is a pic I took of an HP > 5529A LASER head. > > (Aside: If anybody is interested, there is a Yahoo Group for LASER > Interferometer fans) > > Note the two leads to CR5 near the top, center of the pic. They go to a > feedback photocell and obviously have never been trimmed or soldered. > > The unit ran fine that for several months before suddenly failing. > Soldering the leads fixed the LASER head. > > Best, > > -John > > ========= > > Dear time-nuts, > > > > As I am trying to bring a HP5065A back into operational mode, I have > > been looking at the Cell oven and Lamp oven readings, but it has been > > jump. While looking at it with a friend (a true soldering master) I > > popped the lower lid and he found that one of the wires was not > > soldered. Sure enough this was one of the taps from the A11 board for > > the front panel. It has been like this when it was assembled, so the HP > > quality checks didn't catch it. > > > > I do beleive that the other end have the same problem, the selector > > switch shows the same unstable behaviour, but is harder to check. I have > > not yeat figured out how I pop the front end off so I can access the > > rotary switch properly. > > > > So be aware of wires. A bad solder joint doesn't seem to be there, but > > lacking solder joints was a bit surprising. > > > > I have trouble with this old beast, it does not lock so caring about > > basics like ovens and oscillator tunings has been my starter approach. > > The rubidium Cell and Lamp ovens (pin 2 and 14) seems to stabilize at > > 15,75 V rather than the 18 V which the manual indicates should be the > > normal. > > > > I cannot honestly say I spent quality time on it yet. Hope to get up to > > speed on it. > > > > Cheers, > > Magnus > > > > _______________________________________________ > > 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. > > > > > > _______________________________________________ > 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. > _______________________________________________ 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.
