On 04/02/2012 02:33 AM, [email protected] 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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