(Topic ID: 277188)
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Big Brave
Gottlieb, 1974
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Quoted from petebest:What / where are the switches I’ve circled in red?
The switch labeled O is a normally open switch on the O or Ball Return Relay (as shown in the table in the schematic).
The switch labeled P is a make/break switch on the P or Add Player Unit relay.
For the Ball Return solenoid to fire the O and P relays both need to fire, which should close the two switches you circled. The other two switches need to close too.
Quoted from CaffeineSlug:It looks like P relay should not go yet, the correct switch is already closed. I think the trough switch initiates P to fire.
You're right. My bad. The XB/Last Ball relay too should already be in the correct position to allow the Ball Return to fire until you drain the last ball.
Quoted from petebest:the correct “home” position for the bonus unit? On a rivet or on the bakelite?
There are a pair of Zero Position switches on the Bonus Unit that should activate when the unit is in the reset position. They're probably activated by a pin mounted to the stepper gear on the other side from the wiper board.
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