Galaga sound question speaker maybe?

trick4x4

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hey guys i started playing my galaga today and about 15 minutes into game play i noticed the sound got really low then about 10 seconds later became normal this happened about 3 or 4 times in the hour i was playing my question is could it be the speaker like a loose wire or something else? total newbie but willing to listen and hopefully learn the ropes been a member for awhile but this is my first real problem with my game.it looks to be all original wiring inside even has the filter board which i hear all of you guys say to throw it away.
 
I really don't think it is a speaker problem. I would say start with the volume pot. There is a adjustment pot on the board right near the audio amp. With the unit off just turn pot back and fourth (gently) then do the same thing while pulling on it and then again while pushing (slightly) on it. Adjust to about 1/4 the way from counter clockwise position power up and test.

This is a simple test and only takes a few min. to do.

If it works you can send me an In-Out-Burger.
 
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Also, the caps in the audio amp section of the board may need replacing.
 
As kb0jjn said it might be a volume pot issue. Turning the put might clean the whatever is causing the the pot not to make good contact. If the pot isn't making good contact you might want to look into replacing the the sound pot.

Another simple repair you might try is to remove the filter board and clean the contacts. This is done with a nice soft pink rubber eraser run across the finger or the board. If the filter board sometime does not make good contact due to oxidation. It's something simple easy to try.

Another simple repair you might want to try is just wiggling the sounds wired. They might just need to be unplug and replugged back in.

Good luck with your repairs.
 
hey kb0jjn,channelmaniac&alpha-tron thanks for your input my computer was down so i am back on track now. I will try all your suggestions i really appreciate it i will give it a go in the next day or two.The kids started school today so it's crazy around here.i will post my results soon thanx again.
 
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