Try to re-initialize it. I think that it is possible to reset the unit. My LPFRS, for example, has two commands (F00, C00) to reset the fine and coarse tuning to the factory default. I have to read the FE5680A datasheet to confirm but generally digital units have factory defaults, resets, presets and so on.
On Wed, Nov 30, 2011 at 10:26 AM, WB6BNQ <[email protected]> wrote: > John, > > Instead of trying to fix it you should fault the unit back to seller and > get a refund or have him > send another unit. I would also attempt to get them to pay for the return > shipping as well. After > all it is their fault they sent a bad one when all of them are claiming > that they are working > correctly. > > As for troubleshooting, that is way easier said then done. These newer > series of FE-5680's are much > more digital in nature then the older design, which makes it much harder. > The company that makes > them is not and will not give out information. > > Bill....WB6BNQ > > > John Beale wrote: > > > Just yesterday I received two FE-5680A units from China. One of them > works > > and one doesn't achieve lock. Both are labelled with FEI P/N > > 217400-30352-1. Here's a photo of the one that works, the other looks > just > > the same but different serial number. > > > https://picasaweb.google.com/109928236040342205185/FE5680A#5680473663653140162 > > > > FE-5680A Rb #1: > > At startup, RF out (pin 7) ramps from 9.999828 to 10.000066 MHz for a few > > minutes, then locks at 10.000000 MHz and pin 3 drops low. The RF signal > is > > about 2 Vpp. Power draw at startup about 25 W, dropping to 10 W. > > > > FE-5680A Rb #2: > > RF out scans from 9.999799 to 9.999994 MHz repeatedly, and does not > achieve > > lock. Pin 3 remains high. The RF signal is about 1 Vpp (half the level > of > > the working unit). Power draw similar to unit #1. > > > > Any suggestions for what might be done to prod the 2nd unit towards > > working? I see some things which might be trimmer caps on the board, > and > > what might be a round heating element(?) soldered to a crystal can in > this > > photo: > > > https://picasaweb.google.com/lh/photo/0WRM10pGG0Kd89Ji80yoa9MTjNZETYmyPJy0liipFm0?feat=directlink > > > > thanks for any advice! > > > > John Beale > > N8JUF > > > > _______________________________________________ > > 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.
