(Topic ID: 287228)

Ball Index Relay Questions-Doozie

By schwism

6 months ago



Topic Stats

  • 10 posts
  • 3 Pinsiders participating
  • Latest reply 6 months ago by zacaj
  • Topic is favorited by 1 Pinsider

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#1 6 months ago

Bear with me-this is my first Williams EM project.

I’m trying to figure out how things work with the Ball Index Relay. From the schematic it looks like at game start Impulse A on the score motor should activate the 100 point relay in the backbox which in turn should activate the Ball Index Relay. Mine does not although Impulse A does reset the ones and tens. In game play scoring a 100 point rollover or other feature will trigger the 100 point relay and Ball Index. I’m pretty sure this is not correct.

When ball 1 drains the Ball Index Relay turns off. Looking at the schematic I don’t see any way it can stay on. Is this normal and if so how does Ball Index get turned on again?

Given the switches it does look like it has to turn off from Score Motor 3A and the Outhole relay but once again I don’t see how it turns back on.

Are there any Williams EM experts that can help me?

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#2 6 months ago

The ball index relay should energize the first time 100 points is scored, and turn off at the end of the ball (note how it's held in by a switch on itself through the outhole relay). I'm not sure where you're seeing that other stuff you mention

#3 6 months ago
Quoted from schwism:

In game play scoring a 100 point rollover or other feature will trigger the 100 point relay and Ball Index. I’m pretty sure this is not correct.

Actual this is correct behaviour and by design. Sometimes the outhole kicker wasn't strong enough and the ball would roll back into the outhole. This use to have the ball count increase and the player wouldn't be able to play the ball.

The Ball index relay ensures you have scored some points before allowing the ball count to advance.

#4 6 months ago
Quoted from zacaj:

The ball index relay should energize the first time 100 points is scored, and turn off at the end of the ball (note how it's held in by a switch on itself through the outhole relay). I'm not sure where you're seeing that other stuff you mention

If that’s the case why does Impulse A pulse it? Besides, that would mean the ball count would not advance unless you scored a 100 point feature.

#5 6 months ago

Looking at the playfield, with the only path being one of the four 100 point rollovers one cannot avoid turning it on. Still not sure why Impulse A pulses it but I guess it doesn’t matter.

#6 6 months ago

So the 100 pt relay causes it to pull (green)

The Motor switch 3A or the out hole relay - Keep it pulled. So the Outhole relay has to pull and the motor switch 3a both have to be open for the ball index to stop pulling.

There shouldn't be any firing from the impulse motor gear.
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#7 6 months ago

Games start and the ball kicks out into the shooter lane.
-Shoot the ball and score 100 points (Through one of the lanes a the top of the play field)
-Ball index pulls and stays pulled.
-Ball drain.
-Out hole relay pulls (Opens the Outhole relay switch)
-Motor runs
-When the switch stack on the 3rd motor gear falls, The normally closed switch opens and the circuit is broken
The ball index relay releases.

This will happen for each ball played.

#8 6 months ago
Quoted from schwism:

Looking at the playfield, with the only path being one of the four 100 point rollovers one cannot avoid turning it on

That's the whole point. It basically verifies that a ball managed to make it "into play"

#9 6 months ago

It all makes sense now. I’m guessing some of the electrical layout is common to other pins and they adjusted what they needed to.

#10 6 months ago
Quoted from schwism:

It all makes sense now. I’m guessing some of the electrical layout is common to other pins and they adjusted what they needed to.

All Williams of this era have pretty much the same setup for the ball index, the only difference is which score relays activate it

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