Hi Guys:
Brand new machine and, after 10 games working as it should, the following came on the screen at power up:
Gobstopper Hole - Check Device - Malfunction Detected
Check matrixed switch #51, Gobstopper Lockup #1 (at kicker) (Stuck open)
So, gobstopper hole is stopping at 9 o'clock position, instead of 12 o'clock. Tested opto and all OK. I can move the disk by hand, so it is not binding.
Switch 51 is dead but I know the switch is good. To be sure, I changed it with a known good one but still dead. Does not activate in switch test, just the red indicator that switch is bad.
I pushed and pulled every plug and socket imaginable on both the underside of the playfield and in the backbox. Nothing made any difference.
For some reason the gobstopper hole has now started defaulting to 12 o'clock position (as I think it should) but never moves to 6 o'clock, to allow a ball in. The target in front of the gobstopper disk (which I think is supposed to activate the disk) works fine and is registering, when hit.
Help, please!!