Guided Missile sounds

newkid3

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I have a guided missile that I have replaced the Roms to Eproms and changed the jumpers for the Eproms. I don't have the left or 2nd player missile sound and the explosion sound is really distorted or muffled on both players. I changed the LM3900 at H4 for the left missile sound and it did not help. It was the same way when the original Roms where in the board. Anyone have any ideas for what it might be? Thanks
 
you might want to check your speakers first or just sub in a known good pair for starters

output amps can be tested by placing your finger on the solder side of the chips legs on the daughtercard - it will hum if good

i usually start at the amp end and work backwards until i find the fault
 
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