Galaga Board Help....Missing a Sound

Bishopx

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Donor 2011
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I have a working Galaga PCB that has one missing sound. How do I identify which rom is at fault for this?

The specific sound is the noise made when the enemy ships break formation and fly down toward you.
 
Partially lift and reseat every socketed chip on the board. That will most likely correct your problem. As far as I know, only the "boom" is unique to a single chip...
 
I reseated all the chips and got the board working to this point but it is definitely missing a sound effect.
 
Enter test mode. Do the 1st two lines of text read "RAM OK" and "ROM OK", or something else (other than "OK")?

Also in test mode, you can move the joystick then press the fire button to play each sound. I think there are like 18 different ones. Which one doesn't work?
 
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