I experienced a little bit of odd behavior on the Nine Ball this afternoon.
TLDR... Could weird behavior be the result of the gap of the jet bumper being too close?
Here’s what happened.....
I turned the machine on and it went through it’s typical boot up, including the left side kickout. The machine was ready to play.
The upper two drop target banks each had a target or two down when I pushed the start button. The machine started its usual start of ball drop reset but didn’t complete and then froze up. It seemed that it could not reset the drop targets. No blown fuses or other apparent breakdown.
I turned the machine off and on again and it booted up the same as before and when I pressed start it did the same freeze up behavior.
Turned the machine off and I manually reset the right side drops and the big set on the left, but not the topmost bank and the machine booted up and started however with a louder and somewhat incorrect background sound. I played a couple of balls and the sound corrected itself, and after couple more games no further problems arose.
Twenty minutes later I turned it back on, started a game and as soon as the ball hit the jet bumper it froze up again.
I lifted the playfield and increased the gap and played a few games with no problems.
Added 56 days ago
Solution!: I replaced the 2 solenoid driver board capacitors and the problem seems to be fixed.