(Topic ID: 316232)

Strange problem with Bally Star Trek

By jrpinball

1 year ago



Topic Stats

  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 1 year ago by jrpinball
  • No one calls this topic a favorite

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#1 1 year ago

My brother asked me to post this for him. He's in the process of reviving a Bally "Star Trek" game (original version).
"I have a strange problem with my Bally Star Trek. The game will not boot up if the sound board is connected. I get 6 pulses from the MPU board. On the 5th pulse, I get a blip from the sound board but then nothing. If I disconnect the large connector to the sound board, the game will boot up normally. I can then plug the sound board back in and it works normally. What if anything do I have to replace on the sound board?"
The game has an Alltek replacement MPU board, and he has repinned many, if not all the connectors.

#2 1 year ago

The typical cause of this (failed boot with no last LED flash on power-up when the sound board is connected) is due to a shorted 1N4004 diode at CR3 on the sound board. The diode should be tested/replaced if faulty.

#3 1 year ago
Quoted from Quench:

The typical cause of this (failed boot with no last LED flash on power-up when the sound board is connected) is due to a shorted 1N4004 diode at CR3 on the sound board. The diode should be tested/replaced if faulty.

Thanks. I'll pass that information on to my brother.

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