Quoted from wayout440:The game should never feed two balls simultaneously to the shooter lane. Thoroughly check your switches, especially trough and shooter lane.,,check game is accurately level. A glitch in a switch or off level may cause this problem.
This is likely due to a bad trough switch. There are two if I remember correctly. This will be the second one that registers the ball after it has been sent to the trough from the out hole. Here is a video of normal operation. I have had lots of issues with this before and just replaced the switch. If the switch flutters at all it will easily confuse the CPU and cause this issue.
Bloomington, IL
