[time-nuts] FTS4060/S24 Location of E26 Test Point & ConfirmOperation?
Chuck Harris
cfharris at erols.com
Fri Jan 7 14:32:54 UTC 2005
OOPS! It turns out mine is the heavy as lead FT4050 unit. As I recall,
there are no openings on the OCXO at all, but I may be mistaken. After
my unit quit, I put it on the shelf. It has been more than a few years,
so I doubt that my tube will come back up ever again. But it might be worth
a try, I guess.
-Chuck
Brooke Clarke wrote:
> Hi Chuck:
>
> On my OCXO there is a screwdriver adjustment on the top side.
>
> On older units you need to pull the CPU board to get access to the OCXO
> mounting screws and need to lift out the OCXO so that you can access the
> screw driver adjustment that's on the front panel. It might be worth a
> try to make up a set of right angle screw drivers out of coat hanger
> wire with different angles on the tip so that you could make the
> adjustment w/o lifting the OCXO.
>
> 73,
>
> Brooke
> PS I have confirmed that my SR 620 passes self test and have done the
> auto cal, but still am getting the same drift. Very strange.
>
> Chuck Harris wrote:
>
>> My 4060 was working like that for a while, but eventially the green
>> light wouldn't light anymore. What I found was the OCXO had aged to
>> a point where its frequency could no longer be dragged back to the
>> proper frequency with the voltage control. I know there is an adjustment
>> available inside the oven, but I never got around to finding and fixing
>> it. (anyone know how to adjust the crystal osc. without ripping it
>> completely apart?)
>>
>> -Chuck Harris
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