Ed, thanks for your comments. In an image of the unit, it appears the front panel is a bit dented near the displays, and I'm worried they might be damaged - they are glass envelopes after all.
I have managed to find a thread on a Chinese forum (possibly the same forum I've seen referenced in the past) with some pretty excellent photos of the internal construction (website intermittent, possibly blocking some IP ranges). http://bbs.38hot.net/read.php?tid=14354 Notice they do not use a buried zener voltage reference but a 1N829, see in particular the post on the second page discussing the voltage reference board http://bbs.38hot.net/read.php?tid=14354&ds=1&page=2#159876 I've been bitten by the bug... all stemming from trying to repair a Keithley 2000 Andy Bardagjy bardagjy.com On Dec 18, 2012, at 12:21 PM, ed breya wrote: > That seems like a nice piece of equipment if it works or is easily > repairable. Why do you assume the displays are broken? If they used gas > discharge displays, they would likely be Nixie or Panaplex type, which are > pretty durable, and are still common enough to not be a problem with > procurement. There is also plenty of data out there about these items and > their drivers. The most common failures I have seen in these types of > displays are bad digit drive transistors, and sometimes bad segment drive ICs > - the tubes themselves usually don't just crap out, but gradually darken or > fade out. > > I don't know about the manuals, but if you do locate one in pdf form, please > share it if possible - it's nice to have access to that info for reference > material even without owning one of the units. > > Ed > > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
