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Author Topic: Space shuttle issues  (Read 251 times)

Offline WannaTheater

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Space shuttle issues
« on: June 04, 2025, 05:50:45 PM »
A friend sent me a video of his Space Shuttle-  He can start a game, flippers work, then randomly flippers die and ball drains.  Lights are still working- flashing.  All score displays are still lit up.
The MPU is not original- it is a Rottendog MPU9211

Any suggestions on where to look?
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Offline BigMatt

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Re: Space shuttle issues
« Reply #1 on: June 05, 2025, 04:54:03 AM »
Does it advance to next ball and work right after? Have him do it with glass off so he can catch the ball and set aside, have him hold a flipper button IN and tap on the flipper enable relay z1 on the cpu and wiggle J19 id suspect a bad ground thru the relay first as it cycles between balls and resets itself. If that doesnt work have him jump j19 on cpu 1 or 2 to ground while holding a flipper button in this will bypass the relay and prove its faulty

It this scenario with no flippers he can meter dc on a flipper coil lug to ground if he has it its the ground side.

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