(Topic ID: 261727)

GTB 300- advance bonus not rotating

By Mikala

2 years ago

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  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by MarkG
  • No one calls this topic a favorite


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#1 2 years ago

I’m finally getting to my 300 I picked up about a year ago. The previous owner did more damage than good trying to get additional players working. That took all but a minute to figure out that the stepper unit was seized up. I have been using this thread to get this game up and running. After about five games the whole machine went dead. That problem is fixed now.


A copy of a Top Score schematic is located here.

I now have the machine working about 90%. The last problem I have is the advance bonus is not rotating when the ball rolls over the switches. Although the schematic seems easier to read than a Williams, I’m just not seeing what switch makes these rotate. Thanks in advance.

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#2 2 years ago

Just ignore these pictures, was another question, but I figured it out.
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#3 2 years ago

The G/"5000 Point and Add Bonus Unit" relay at 5E on the schematic shows all the target and rollover switches that can make it fire. There are lots of them. Once the G relay fires it should start the Score Motor and close another switch (labeled "G") at about 15F on the schematic. When that switch and the Score Motor 4C switch are closed together the Add Bonus Unit solenoid at 15E should fire.


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