Working on fixing one of these up for a friend. Got everything working great except the sounds/sound effects/audio. All the speech is working fine. All the correct speech is present when the test button is pressed on the audio board but there is no sound(s).
Now here’s the strange part. If I disconnect the main connector from the sound board and reconnect it with the game powered on, the sounds come on (but some are still missing). With the sound(s) working, if I power cycle the game, they don’t come back. If I reseat the connector on the sound board with power still on, it comes back until the next power cycle when it stops again.
The sound board LED has one quick flash at power up, three flashes, then two final flashes, which research shows to be correct. I’ve rang out all the wiring for continuity, reflowed and inspected all header pins, tested all the test points for voltage (-5, +5, and 11.5) but the 11.5 was reading around 14.8. Not sure if that’s an issue or not. +5 and -5 were right on. Both volume pots work as advertised with no issues when the sound and speech are present.
Any help would be appreciated. Thanks.