http://www.rbarrios.com/projects/MV89A/

-=Bryan=-

> To: time-nuts@febo.com
> From: a...@pcscons.com
> 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: brayn...@gmail.com
> >> Date: Tue, 20 Sep 2016 20:06:59 +0000
> >> To: time-nuts@febo.com
> >> 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 _ <bpl...@outlook.com> 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: lister...@gmail.com
> >>>> Date: Mon, 19 Sep 2016 14:31:06 -0700
> >>>> To: time-nuts@febo.com
> >>>> 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
> >>>> _______________________________________________
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