(Topic ID: 261727)

GTB 300- advance bonus not rotating

By Mikala

5 months ago

Topic Stats

  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 5 months ago by MarkG
  • No one calls this topic a favorite


Linked Games

Topic Gallery

There have been 3 images uploaded to this topic. (View topic image gallery).

2B2E7165-AFB0-4B25-A282-47831B0CA0C1 (resized).jpeg
D45D1952-7ADC-463A-94EF-9D831283E1EB (resized).jpeg
373D75B2-1AEF-4DE1-88D5-CF9FFC4EDFBA (resized).jpeg

#1 5 months 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.

373D75B2-1AEF-4DE1-88D5-CF9FFC4EDFBA (resized).jpeg
#2 5 months ago

Just ignore these pictures, was another question, but I figured it out.
2B2E7165-AFB0-4B25-A282-47831B0CA0C1 (resized).jpegD45D1952-7ADC-463A-94EF-9D831283E1EB (resized).jpeg

#3 5 months 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.


Promoted items from the Pinside Marketplace
From: $ 18.00
Apparel - Men
Pinside Shop
From: $ 6.50
Pinball Haus
$ 99.99
Playfield - Toys/Add-ons
Lighted Pinball Mods
$ 86.00
Playfield - Toys/Add-ons
The MOD Couple
$ 17.50
Playfield - Plastics
Pinball Haus
$ 39.99
Matt's Basement Arcade
$ 6.00
APB Enterprises
$ 29.99
Matt's Basement Arcade
$ 25.00
Cabinet Parts
From: $ 19.99
$ 14.99
Chroma Pinball
$ 19.95
Playfield - Toys/Add-ons
$ 49.00
Cabinet - Other
Chrome Candy
$ 750.00
Flipper Parts
$ 149.99
Playfield - Toys/Add-ons
Lighted Pinball Mods
$ 69.00
Playfield - Protection
The MOD Couple
$ 999.00
Flipper Parts
$ 25.00
$ 24.95
Cabinet - Armor And Blades
$ 154.00
Cabinet - Toppers
Id Rather Play Pinball
From: $ 127.05
Cabinet - Sound/Speakers
$ 90.00
Lighting - Under Cabinet
Rock Custom Pinball
$ 32.00

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside