So, I'm putting the finishing touches on a BSD rebuild - managed to get most everything 100%, even the mist multiball (thanks to a replacement board!), however I'm still fighting one particular issue:
At startup, at random times, the system notes 'Pinball Missing'. It then 'looks' like it's going to start a 20 second countdown, but stops at 20 seconds, and never proceeds.
Other times, it says 'Pinball Missing', and it 'does' start the timer, and after 20 seconds allows the game to start.
And finally, at times it simply starts the game with no errors.
Per the manual, is states it may be a Ball Trough switch, or Ball Shooter switch, both of which test 100%, never an issue there.
The ONLY other issue I'm still chasing is the opto 72 for the Coffin Popper - for some reason it quit tonight. I haven't had a chance to meter the wires to check for proper voltages, and it has a new opto board (yep, replaced both opto boards). Could this be the reason for random 'pinball missing' errors? Can't imagine so.
Any sage advise (actually any advise is appreciated !!!)?