No subject

Z3805A board (happens to be out, for re-capping):

   - 1002
   - 1783
   - 1102
   - 1001
   - 1332

--Andrew

--------------------------------
Andrew E. Kalman, Ph.D.


On Thu, Aug 17, 2023 at 3:55 PM Corby Dawson via time-nuts <
time-nuts at lists.febo.com> wrote:

> I have a Z3801A GPSDO that has been running fine for well over 10 years.
> It recently lost the lock indication and I can't get it back! I did look
> at the work around to fix the problem with the outer oven controller
> getting confused and it did not fix my problem. However it did show that
> the outer oven was not powering on, even if I supplied the workaround
> pull up described. With 0v supplied the oven is supposed to be off and
> with +5V supplied the oven should be on. With the 5V applies the oven
> voltage is zero. I did notice that the resistors R112 and R113 near P2 on
> the top board seem odd. R112 looks to be soldered very poorly and R113 is
> missing completely!  Does anyone have an opened up unit or the top board
> loose so they can let me know what R112 and R113 are supposed to look
> like? The schematic I have does not show R113. Appreciate it and any
> advice. When the unit failed it did seem as it was still in lock and on
> frequency but with no lock indicator.
>
> Cheers,
>
> Corby_______________________________________________
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