Space Shuttle sound hum

Mr Do

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Donor 6 years: 2012-2013, 2015-2016, 2019, 2025
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After tuning on Space Shuttle, in about 5 minutes, there is a loud hum from the game. Game does play fine. And sounds do work.
Anyone know the problem?
Thanks
 
Check the thread right below yours...looks like someone just posted a similar question...

i believe thats a system 9 like my sorcerer.you can read my posted questions on here what i tryed to fix problem.but cutting to the case do you have a hum.i did and it ended up being my u11 processer 6808 chip was bad
 
make sure your sound boards are all tight to backback some times this is a ground issue.you can check mr pinball repair section for this issue.i know i read about that once.good luck
 
Mine has a hum too. Haven't located it yet. Everything is tight in the backbox. I don't have speech on mine though. Hopefully when I find the cause of the loss of speech, I'll also find the cause of the hum.

Jeff
 
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