(Topic ID: 26720)

Judge Dredd Opto Troubles


By Sarge

6 years ago



Topic Stats

  • 9 posts
  • 4 Pinsiders participating
  • Latest reply 6 years ago by Borygard
  • Topic is favorited by 1 Pinsider

You

Linked Games

You're currently viewing posts by Pinsider Big70.
Click here to go back to viewing the entire thread.

#4 6 years ago

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.

Promoted items from the Pinside Marketplace
$ 47.00
From: $ 29.00
Boards
KAHR.US Circuits
$ 10.00
Cabinet - Sound/Speakers
Gweem's Mods

You're currently viewing posts by Pinsider Big70.
Click here to go back to viewing the entire thread.

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside