Chip, Just for your own information, the NC switch on the pop bumper itself is NOT the scoring switch; it is an EOS switch, designed to cut the power to the pop bumper solenoid when it energizes and pulls the plunger completely down.
The way the pop bumper system works is that the closure of the NO spoon switch (from the ball rolling onto the plastic skirt on the playfield) energizes the R&L pop bumper relay (B relay). See section 2E thru 2I (5th horizontal circuit down from the top) on your schematic.
The B relay then locks in through it's own switch and the NC EOS switches. Three of the NO switches on the B relay serve to energize the pop bumper solenoid(s) and send a scoring pulse to the appropriate 100- or 1000-pt relay (depending on whether game is set for 3- or 5-ball play). When the pop bumper solenoid pulls the plunger in, the EOS switches open, which then cuts power to the B relay and the mechanisms revert to rest state.
Lee
Forest Hill, MD
