[bele2009]

mbates14,

Your PLL circuit or your opto-sensor are not working. Remove your scanning disc so the light beam reach the detector side without problem. Then measure the DC voltage reading at pin 3 of the 4046. In this condition the photo-transistor in the opto-sensor should be in full conduction and you should have close to 12V on pin 3. While you are at it, also take a voltage reading on both sides of the LED side of the opto-sensor.

Place a piece of cardbord in the slot to hide the ligh then recheck the voltage at pin 3. You should now have close to 0 volt DC.

Then I'll try to see what's wrong with your circuit.

Come to think about it, you said that you are powering your circuit from two separate batteries. It does not show on the schematic, but I think the two GNDs (-)should be connected together or your sync pulse won't have any effect on the PLL circuit !

Good luck !

Eric