Electro-Mechanical Pinball Repair For Dummies

 

START-UP SEQUENCE - Williams

 
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When the start button is pressed, the credit unit is decremented. This is done through the credit unit zero position switch and the 2nd Coin Relay (and the ball count zero position switch).

 
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The end of stroke (EOS) switch on the credit unit decrement coil will energize the Coin Relay.

 
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The Coin Relay will trip the Game Over Relay.

 
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The Coin Relay will energize the Reset Relay. The score motor will run.

 
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The Reset Relay will energize the ball count unit reset, through the score motor.

 
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The Reset Relay energizes the 2nd Coin Relay Latch and Game Over Relay Latch Coils.

 
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The Reset Relay will energize the Score Reset Relays, through the score motor.

 
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The Score Reel Reset Relays will zero the score reels, through the score motor. The score motor will continue to activate the Score Reel Reset Relays until all the score reels reach the zero position.

 
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The Reset Relay activates the Bonus Unit Coil until the Bonus unit zero position switch is activated.

 
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When the Bonus Relay drops out, the Outhole Relay is energized through a different bonus unit zero switch and score motor switch.

 
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The Outhole Relay will run the score motor. The Bonus Unit will step up once. The ball will be kicked to the shooter lane.