[time-nuts] Racal 1992 input amplifier offset problem - fixed

[Joop]

I am happy to report that the offset problem I mentioned on Dec 28 is
fixed.
There were no responses to my request, but it might be helpful to others
should their 1992 get faulty in the same way.

Basically the A-input had a low leakage input protection diode (JPAD50)
that was, well, not so low leakage anymore. Should it have broken down
completely the problem would probably have been more easy to spot. Anyway,
it is replaced with a BAS116. Offset and sensitivity calibration went fine
and operation is back to normal.

Joop