have been tinkering with a williams strato flite ,when credit button is pushed the scores reset, score motor turns and then it goes right into game over and then lock switch disengages . not sure if this helps but if i unplug the larger of the two jones plugs,the 22 pin plug, from underneath the playfield, i can push a credit button the scores reset and it sets to play,first player score lights and ball in play lite 1 is lit ,however of course nothing else is working ,if i hit credit button again player unit fires and 2 player lite illuminates .I cleaned all the switched and adjusted .also it wont let me manually trip game over switch to play a game .
thanks any help is greatly appreciated