(Topic ID: 259571)

TECH: Taxi - Left Bumper Error

By Tlamb

4 years ago

Topic Stats

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


Linked Games

  • Taxi Williams, 1988
#1 4 years ago

I have am having some issues with my Taxi and was hoping for a little direction. It initially started with an error upon boot up. It said there was a switch error; LEFT bumper. I put the game into test mode and went into switch test. I tested the switch and all tested normally. Exited test mode and played a game, everything seemed to be working normally. Then I rebooted the game, and the switch error showed yet again. I went into test mode and this time I tested all the bumper switches in edge switch. I started getting some strange feedback then the RIGHT bumper locked up. I could hear the coil was locked so I turned off game. Rebooted and now there was no error but the coil right coil remained locked.

I would think it is the Q73 that controls the right bumper coil looking at the manual but wasnt sure why it was acting so flaky considering the original error was with the left bumper. Any one else run into this before?


#2 4 years ago

You have two separate problems now.

With game off, lift play field and make certain that there is an air gap on the RT. bumper sol. switch that locked on.

Very well could be Q73. Also, keep in mind that the transistors that runs the pops and the slings on Taxi are CPU controlled. Sys11B was the first generation where that is true. Important information if replacing Q73 does not resolve the problem.

The initial error on left pop COULD be the points scoring switch not working as well. Once you get the RT pop sorted out, put the game in play mode again and confirm that the left pop is awarding a small amount of points, when activated. Those mechs have two switches, one that activates the pop and one that scores a small amount of points.

System 11's are awesome!

#3 4 years ago

Replaced Q73, all is well! I thought maybe the quirky stuff before was related. I had already adjusted the bumper switches, thinking once I resisted both, it would go back to normal (no error), and it did. Just though that the right bumper getting locked on around the same time was strange. Regardless, all is back in working order!

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