Quote:
Originally Posted by old_tv_nut
Again, can you post a clear pic of the schematic of the 4.27 MHz oscillator, and indicate where you are connecting the counter? Putting a 0.001 disc cap in series with the counter lead might be a good thing to make sure you aren't loading the oscillator.
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I posted the schematic in the last pic but I'll isolate it down. Unfortunately whoever scanned this schematic did so at a terrible resolution, and I haven't been able to find a better one since.
Frequency counter is attached to TP204,the 4.27mhz crystal is X201. The adjustment screw is C219.
