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(Topic ID: 66634)

Pop Bumper locked-up

By Hi-Fi

10 years ago



Topic Stats

  • 7 posts
  • 3 Pinsiders participating
  • Latest reply 10 years ago by terryb
  • Topic is favorited by 1 Pinsider

You

Linked Games

  • Taxi Williams, 1988

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#2 10 years ago
 
BDR

vectordreams

Pinside member

US Colorado Springs, CO

10y 41,950 113 4

Transistor locked on for some reason. Make sure to replace main driver and the pre-driver as well. Which pop bumper locked?

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#5 10 years ago
 
BDR

vectordreams

Pinside member

US Colorado Springs, CO

10y 41,950 113 4

Check Q73 and if you do replace it and it still locks on you will need a logic probe to test the U45 chip that is a 7402.

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