Score motor on Bally Space Time

By Reed

6 days ago


  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 5 days ago by Reed
  • Topic is favorited by 1 Pinsider


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#1 6 days ago

As I'm learning how the various switches and relays work and trying to read the schematics to fix several issues, I've come to focus on the score motor. The wiring diagram shows the SC switches as either normally opened or closed. Does this indicate what state the switches should in be when the SM is in its home position? I've noticed that when the game resets (I have to manually activate the reset of the issues) the number 1 cam switch set is NOT in the home position (resting in one of the two notches on the bakelite gear). When I activate a relay that causes the SC to rotate, it again stops not in its home position. If this is not how it should work, how do you adjust the cams? Thanks.

I should mention that I have cleaned all the switches, no crud on any of the contact points, only shiny metal.

#2 6 days ago

These 4 switches keep the motor running until it reaches its home position. Use Alligator clip jumper wires to diagnose where the problem is.

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#3 6 days ago

Thanks Howard for the reply. Not sure I know where those coin chute switches are, and because the coin unit was removed from the game (I still have it) by some previous owner, I'm not sure if that complicate things. The family member who gave me the machine said it worked fine for years (free play mode) and only recently wouldn't start up. I take it that if one of those switches you labeled isn't working properly, that that would cause the score motor not to begin and end in the home position.

It seems that the score motor does rotate 180 degrees each time it's activated, but it doesn't start in a notch and it, therefore, doesn't end up in the opposite notch. So something is causing it to stop rotating before the top #1 SM switch is opened.

#4 5 days ago

Found the problem! It was the 1E switch on the SM. Thanks Howard! It wasn't making contact when the SM rotated out of the notch. Now everything seems to work. Both ball holes at the top now eject, the blue popup bumpers now put up 100 pts on the score reel, the output hole ejects the ball to the shooter lane and the credit button works. Wow, amazing how one simple switch mis-adjustment can cause all those components (and others?) to fail. Live and learn.


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