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(Topic ID: 26720)

Judge Dredd Opto Troubles

By Sarge

11 years ago



Topic Stats

  • 9 posts
  • 4 Pinsiders participating
  • Latest reply 11 years ago by Borygard
  • Topic is favorited by 1 Pinsider

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#4 11 years ago
 
BJH

Big70

Pinside+ Frequent

US Round Rock, TX

11y 63,050 170 61

You probably have an bad or failing LM339 chip on your 7-switch opto pcb under the playfield. U1 & U2. They will cause faulty switch closures on your optos when one or both go bad. They are cheap and not real easy to test. Replace them and put sockets on. Should clear your problem.

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