Bob like you I did some hunting and believe I ran across the same details on the supply. There is a good thread on the S200 complete withinternal pix and a link to download the OS image. Just in case the image is corrupt. No idea if S200 software can be used in a S300 but its a 512 MB SD flash card worth the try. If its not something like the supply. Other then that I did get the S300 ops manual and thats about all there is on the unit. Regards Paul.
On Tue, Dec 3, 2019 at 5:07 PM Bob Darlington <[email protected]> wrote: > Guys, I have a broken Syncserver S300. OCXO, gps, 60kHz receiver > internal. No Rb or anything special. It's been broken since 2015. It was > fine till I power cycled the thing, but that's the way it goes with .gov > surplus stuff sometimes. It ran for years before that. > > Symptom: 4 red front panel lights, nothing on the serial port (front serial > port, don't know if there is another inside), and during boot the VFD on > front spins the hourglass. It gets to booting or loading OS and eventually > just freezes. > > Digging through the archives I see a similar issue described and that > system seems to have been resolved by noticing high frequency ripple on at > least one of the DC power supply lines and replacement of a capacitor. > Well, I saw that, and I found a bulging cap, and replaced it. And sure, > maybe the ripple is better but it's not perfect and it didn't fix the > problem. There's a lot of trough hole electrolytics in the PSU. The one I > changed required desoldering of a daughter board that was bolted to some > other bits. A real pain. 15 minute "fix", but a pain. I don't see any > of the others bulging but that doesn't mean they're all good. I don't know > if the ripple I see is even coming from the PSU or the main board, or if > it's even a problem. > > There was some speculation about CF card corruption. I didn't chase that > down. > > I'm done! > > If anybody in the USA is interested in continuing on this repair project, I > will give you the unit for the cost of shipping. I don't know what that > will be, but I assume under $50. The unit has rack ears and cosmetically > is a 9.5 out of 10. Talking to TVB, his suggestion was to test with an > external clean power supply to rule that out. > > In the very least it's a pretty nice 1U rack enclosure. > > Please, ping me direct and I'll let the list know it's spoken for. I'll > let the next owner ask for help! I'll image the CF cards to keep around > just in case. Again, USA only. Somehow shipping clocks will be under ITAR > rules and I don't wanna go there. > > -Bob N3XKB > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
