[time-nuts] MTI 260-0624-D OCXO

[Bob Camp]

Hi

Best guess is these things get taken off the board with either a big torch or a charcoal fire. 
You can ask Mr Google to dig up pictures of the process. Depending on just how quick 
they are, the insides of the OCXO can easily be reflowed. The likelihood of it reflowing and
cooling back to a reliable joint … not real good. 

Bob

> On Feb 17, 2016, at 5:16 AM, Andrea Baldoni <erm1eaae7 at ermione.com> wrote:
> 
> On Tue, Feb 16, 2016 at 07:58:21PM -0500, timenut at metachaos.net wrote:
> 
>> I just received a 5Mhz OCXO from eBay (MTI 260-0624-D OCXO). After testing it,
>> it is clear that it is defective.
>> 
>>   1. It never heats up.
>>   2. The reference voltage is zero.
>>   3. Only noise is seen on the output pin.
> 
> I had the same issue with some of them. It's very likely that the internal
> solder connections from pins to PCB are broken, at least, the one for power.
> It happens because the inner oven is heavy and there isn't any thermal
> insulator (besides air) to keep it from moving.
> 
> Wheter the crystal has been damaged or not, it's unknown. I had one where the
> crystal actually fell off from its supports too.
> 
> I posted a link to photos of the internals, time ago. The link is dead now
> and I don't think to have the photos anymore but perhaps someone downloaded
> them.
> 
> Best regards,
> Andrea Baldoni
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