Ok I’m kinda stumped on this one. My NGG was playing fine except for two rollover switches not activating every time (right out lane and right cart path). I lifted the playfield and adjusted the switches. When I put it back down and restarted the game, all 6 balls just kept ejecting into the shooter lane and were fired out into the play field. At this time everything acts as it is supposed to during a game, except that pressing the flipper buttons does nothing. The balls continue cycle through the machine until I shut it down. The right gofer also remains in the up position during this time, and the putting green fires trying to find balls.
When I go into test mode it tells me that “wheel motor is broken”. The motor spins free from underneath and is not locked up. I took a look at the motor control board under the playfield and noticed the 100uf 35v capacitor was puffed out with a tiny leak, so I replaced that and restarted but still got the same result with the error and the balls ejecting.
I then figured it might be a dirty opto sensor on the ball ejector as there are six of them, so I took the assembly apart on both side and cleaned the opto leds, and realigned them. Turned the machine back on and still the same problem.
I reseated all connectors under the playfied and in the back box and changed the batteries for good measure (no acid corrosion).
Can someone point me in the direction of where else to start or what tests to run?
I also uploaded a short video of what the machine is doing here:
Thanks so much for any suggestions or advice.