Any tips on resoldering the can, special solder or flux required? Quite often they can be found for a good price on Ebay, from what I have read they are a good OCXO minus the issue of the one particular cap failing.
-=Bryan=- > From: [email protected] > Date: Tue, 20 Sep 2016 20:06:59 +0000 > To: [email protected] > Subject: Re: [time-nuts] Normal operating specs of a Morion MV89? > > Yes. This low output due to capacitor failure is a very common failure. > From the last set of MV89a I got on the bay, all had this issue. > > I had good luck opening mine with a hot air rework station with a small > nozzle to blow the solder seal away. A bit of careful prying with a thin > flat screwdriver while it is still hot to pop the bottom from the case. The > capacitor is easy to get to once the outer can is removed. Hot air to > remove. Then tweezers and a fine point soldering pencil made for an easy > repair. > > Obviously, be very careful and be sure to work on an appropriate surface > for the amount of heat involved. > - Brian > > On Tue, Sep 20, 2016, 12:57 PM Bryan _ <[email protected]> wrote: > > > May also want to check the output amplitude. If memory serves me correct > > it is very common for a capacitor inside this model number to fail. It can > > be fixed but requires a torch or a pretty heavy duty soldering iron to get > > the can open. > > http://www.rbarrios.com/projects/MV89A/ > > > > -=Bryan=- > > > > > From: [email protected] > > > Date: Mon, 19 Sep 2016 14:31:06 -0700 > > > To: [email protected] > > > Subject: [time-nuts] Normal operating specs of a Morion MV89? > > > > > > I recently ordered and received what claims to be a 2007 vintage > > > Morion MV89 from ebay (I say claimed as that what the auction item > > > said, but my unit is missing the identifying label on the top and just > > > has '2007 MV89A' written on the side in marker). I've powered it up > > > with a bench power supply at 12V and it's drawing 390mA at steady > > > state. I measured the case temperature with a ThermaPen Mk4 (not often > > > I get to combine the hobbies of bbq and timenuts...) which is > > > calibrated to +/-0.7F to be about 111F, varying somewhat with > > > position. > > > > > > This seems pretty hot - Is this normal ? The datasheet says it should > > > draw <350mA when at steady state but doesn't say what temp it should > > > be at. Does anyone else have info on their version to see whether this > > > is normal ? > > > > > > Cheers, > > > Tim > > > _______________________________________________ > > > 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. _______________________________________________ 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.
