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, mag...@rubidium.dyndns.org writes:
On 04/02/2012 02:33 AM, ewkeh...@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.