Bally Theater of Magic: Fixing a broken trunk and bulletproofing

I’m finally getting around to fixing my Bally Theater of Magic pinball. In this case, as is typical, the trunk stopped working. The trunk is not working at all, so let’s find out what’s wrong and I’ll also go into replacing the trunk opto board with a new and improved, German-made board. Will this fix all the problems? Watch and see….

Part 2: Work continues on the Bally Theater of Magic pinball – in this case, we’ve figured out why the trucnk wasn’t working even after installing a brand new, improved, aftermarket trunk board. The motor driver controller was shot! Now, while we’re bulletproofing the game, this is a good time to install the special Cliffy Protectors around the trunk to make sure there’s no damage to the plafield. In this video I go over how to lift the trunk out to be able to do this, among other things.

We finally got everything working on the Theater of Magic pinball – here’s a summary of everything that’s been done, along with an odd problem I had with an aftermarket proximity sensor.

Rebuilding/Bulletproofing Gottlieb Pop Bumper Driver Boards

This is a series of three videos covering before, during and after, demonstrating problems with Gottlieb System 80 pop bumper driver boards. There are some basic things you want to do to make them work better and more reliably.

Summary of Pop bumper board mods:

  • First, check to see if you have older, or revised boards and convert older versions to the new revised version
  • Replace 47uf cap with 100-200uf cap
  • Add a 4.7uf 10v cap on underside to help with “phantom pops”
  • Re-flow pin headers and make sure to remove any oxidation from the pins
  • Test the driver and replace with a Tip102 if needed
  • To reduce “ghost pops” you can add a 47uf (10v-16v) cap between the pins displayed below:
Location of optional 47uf cap
Location of optional 47uf cap