I think that "Zero Pos. Ball Count Unit" switch is supposed to be closed on the schematic - it's a little hard to tell on that copy.

Volley (resized).JPG

But you have a valid point about some switches being opposite of how they're shown on the schematic. For example, the "Zero Pos. 'Replay Unit'" switch would have to be closed to start a game, yet it's shown as open because, once you've started a one-player game, the Replay Unit drops the credits from 1 to 0 and the switch opens. Sometimes the interlock or latch/trip relay switches will throw me off for a bit - have to remember what state they're in when the game's started. Not sure how they could have made things clearer without making the schematic a lot more confusing... You just have to think of it as part of the fun of figuring out these circuits!