(Topic ID: 269614)

Orbitor 1: Adjusting sensitivity of spinning bumper?

By BRW84

3 years ago



Topic Stats

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

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#1 3 years ago

I recently got an EXTREMELY nice Orbitor 1 in a trade, and I'm super happy with it. Like all machines, of course, it developed a couple of small issues while being transported hundreds of miles, and I was hoping some other Orbitor 1 owners (the few, the proud) might be able to give me some advice.

The main issue is that the upper spinning bumper keeps registering phantom points during gameplay, usually when a flipper coil fires. My guess is that the vibration across the playfield is juuust enough to slow the opto disc that registers points. Is there any way to reduce the sensitivity of the spinning bumper?

In that same vein, what's the best way to access the underside of the playfield? Can you easily remove the plywood sheet, or do I need to hire a child with tiny hands that can fit in there?

Thanks in advance!

#2 3 years ago

IIRC when I had an O1 and had a similar issue I had to replace the IC on the bumper control board. There's so few parts on the board you could try changing the resistors if they have drifted in value over the years that adjusts the values that the switch triggers at.

Don't forget to look at the simpler things first, like cracked headers.

You can test your vibration theory by hitting the playfield to see if you get similar results as a flipper coil firing.

#3 3 years ago

Thank you!

2 weeks later
#4 3 years ago

We cleaned the spinning disk that the opto senses. All is well.

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