Hi Check the output frequency of the unit as it sweeps. I'd bet it's not quite making it to 10 MHz. Look for a trimmer cap near the master crystal. It should be possible to tweak it so the sweep makes it to either side of 10 MHz.
Bob On May 26, 2013, at 1:43 PM, "Gerd v. Egidy" <[email protected]> wrote: > Hi, > > I bought a used Temex LPFRS-01 / LPRO from fluke.l on ebay. Unfortunately the > unit is broken and shows the same defect as was mentioned about a year ago on > this list: after warm-up it locks for a few seconds, but lock is lost again > after a few seconds. The lock output pulls low for a few very short intervals > afterwards, but that's it. > > I got a refund (but excl. the VAT I had to pay at customs), so it's just a > small loss. But of course I want to try to get this thing alive again. > > In the post last year it was mentioned that these used units suffered from > some > kind of water damage inside. So I opened up the unit, but it looks clean > inside. Just very small signs of surface rust on the screws and connector. > > Here are some teardown photos I made: > http://www.egidy.de/temex_lpfrs_lpro/ > > I have connected the serial terminal. When using the "M" command for > monitoring, the unit returns detailed data. The rb signal level is too low on > my unit, see the screenshot at the link above. > > Was anybody here already able to fix such a unit? > > Any ideas what to look for or other insights? > > Kind regards, > > Gerd > > _______________________________________________ > 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.
