Bellco Golden Bell Credits And Plays but wont skill stop

[atlanticom]

I did a quick signal trace for the stop buttons and this is what I found. Stop buttons are wired to the last three pins of the ribbon cable. Each signal goes through a resistor and then up to the first three inverters of the 74HC14 (pins 1,3,5) The output of the inverters (pins 2,4,6) go to inputs of the TD62503 signal driver. The signal driver output pins 4,5,6 then return to the ribbon cable to eventually reach the main circuit board input opto-isolators in bank PC5.

That's the only components that appear to relate to the stop buttons as far as I can tell. I would suggest you test the circuit path I outlined. You can do it using a multi-meter. Voltages are either +5 volts (ish) or 0 volts. I'll try to attach a crude diagram of the circuit path.

Cheers.
stopboard.png