The machine has been working fine forever, but recently it has developed an issue where the speech activation phase works fine, the head rotates to the optics, you knock one ball in either eye, it holds it and gives you a second ball...all normal, but when you hit the second ball in the other eye, instead of the game saying “you look good,” spitting the balls out, and rotating to the next phase, it spits the balls out, the head does not rotate, and the music stops.
Sometimes it will take 3-4 cycles of activating the optics before it finally acts like it should and proceed to the next phase. Other times after the optics are activated, the music stops, and the head does not rotate, the game will do a ball search even though the ball is in play and hitting targets. I’ve reseated all connectors on the boards, reseated the roms and even the PLCC controller on the MPU. The head cycle test works fine and homes the head normally. The head always returns to the speech face after the game is over like normal.
Any ideas? Thanks.