[time-nuts] Re: OSA 5400 schematics

[Bob kb8tq]

Hi

That sound more like the voltage regulators are “gone”. You should see:

1) Power into the oscillator circuits, normally 10’s of ma.

2) Power into the oven control circuits, 5 to maybe 20 ma. 

3) Power into the oven heater(s). A watt to a couple watts if there is an inner oven. 4 to 10 watts for a single oven or outer oven. 

None of this is specific to the 5400, it’s just what you should see on an OCXO in general 

Bob

> On Jun 4, 2021, at 4:32 PM, Marek Doršic <marek.dorsic at gmail.com> wrote:
> 
> I found a broken Oscilloquarz OSA 5400 <http://leapsecond.com/museum/osa5400/1982-OSA-B-5400-ds.pdf> in the shelf. It draws only 3mA of current on power up. (heating element/reverse polarity failure?)
> Can anybody point me to schematics somewhere around?
> 
> What are the typical failures from you experience?
> Thanks in advance.
> 
>     .marek
> 
> 
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