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Video Game Repair/Ms Pac-man / Galaga volume problem


Hi Brian,
I am the original owner of a MS Pac-Man / Galaga game.  Somewhere along the line the volume stopped working.  How can I test the potentiometer?  What should the voltage be going to the speaker.  I can follow the wires to the top where I believe the speaker is however I don't see an easy way to get to the speaker itself.  I have tried the volume control on the board already as well but that should not have been changed anyway.

Thank you for your help.



Hi Sheryl,

It's very unlikely that the potentiometer went bad, but to check it, you can put an ohm meter on the outside lugs and measure that the resistance changes as you turn the pot. When you put the game into test mode, does it report any sound errors? Can you get sound in the test mode?

You can get to the speaker by removing the marquee from the front of the cabinet. The speaker is mounted behind the light fixture. The odds that the speaker has gone bad are incredibly low.


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Brian Penzone


I can answer questions regarding coin-operated arcade game questions down to the logic board. Error codes, erratic operation, dead boards, I can help with them all. I can help with video monitors on a very limited and basic level only.


I have spent nearly 20 years as an avid arcade collector, and spent nearly 10 of those years as the lead tech for a large arcade operator, doing work for manufacturers and other coin-operated amusement companies around the globe. I maintain a good sized collection of arcade games, as well as a large inventory of spare parts for a wide range of arcade machines.

BA from The Ohio State University, Associates from DeVry University

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