[time-nuts] Efratom M3100
EWKehren at aol.com
EWKehren at aol.com
Tue Apr 3 00:11:38 UTC 2012
Magnus
RC oscillator and demodulator along with the 1 uF and integrator are all
standard Efratom, use different pins and the oscillator is 2.72 KHz the
problem is the signal path from the detector to the demodulator. That is what I
am looking for. Will get there. will take time.
Thanks again Bert
In a message dated 4/2/2012 6:29:19 P.M. Eastern Daylight Time,
magnus at rubidium.dyndns.org writes:
On 04/02/2012 02:33 AM, EWKehren at aol.com wrote:
> Magnus
> I am systematically checking every thing. Power is every where, get a
very
> strong 60 MHz with the 5.3125 clearly visible on the spectrum analyzer
also
> counted both with a counter, checked the 85 Hz modulation on the tuning
> diode, is a small signal but the same on my working M 100. Some is off
the M
> 100 some off the FRS. Working on the Servo assembly. Because of dense
> packaging it is very difficult to find the output signal, but I am now
sitting
> down with the ohm meter and retracing all the interconnects on the
servo
> board. It is multi layer. Once I have the 85/170 pass I will inject a
variable
> frequency, maybe 85 Hz is wrong.
> I will keep you posted. The biggest problem is the packing density, very
> hard to get to the pins of the IC's.
Lot's of test-points.
The 4060 (U3) is hooked up as RC oscillator based. 4053 (U2)
demodulates. Isn't the large 1 uF cap the integrator cap?
TP10, TP11, TP13 and TP15 looks like suspects.
TP17, TP5, TP14 and TP9 looks like coming out of modulation counter, but
the last seems to come from the analog frontend at the bottom part.
Cheers,
Magnus
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