http://www.rbarrios.com/projects/MV89A/
-=Bryan=- > To: [email protected] > From: [email protected] > Date: Tue, 20 Sep 2016 15:09:41 -0700 > Subject: Re: [time-nuts] Normal operating specs of a Morion MV89? > > Hi Brian > > which cap is failing in the MV89 oxco-s? > 73 > > KJ6UHN > > Alex > > On 9/20/2016 2:41 PM, Bryan _ wrote: > > 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. > > > > > > ----- > > No virus found in this message. > > Checked by AVG - www.avg.com > > Version: 2016.0.7797 / Virus Database: 4656/13052 - Release Date: 09/20/16 > > _______________________________________________ > 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.
