Space Invaders Dlx sound issue.

analogkid280

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You guys were so great at helping me get my Pac in tip top shape I thought I would try with my SI. It is the Midway Space Invaders Deluxe. Instead of the famous thump thump it hums real loud and the sounds for the players cannon exploding is missing. The other sounds are fine. No problems with the display or game play. I made a short youtube video to demonstrate:

http://www.youtube.com/watch?v=Q9ABwoWbX5A

I did scan the forums and went and checked the power supply plus 5, minus 5, and 12v pots are adjusted correctly now, the board connectors are cleaned with contact cleaner and I popped out the rom chips and cleaned the sockets before reinserting them. The game seems to perform a lot smoother now (hard to put in words) with the exception of the sound issue.

Thanks,
AK
 
Thank you very much. I hooked up the missing ground wire and the sound is lower but still there. I am ordering a test rom and some sound chips.
 
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