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Quoted from seacoastamu:anyone out there fix early data east sound boards? 5 volts is shorted.
torpedo alley pinball is the reference
I've repaired a few of them... I would suggest that either one of the 3 sound amps is shorted or an electryolytic capacitor is shorted.
If you can replace the electrolytic caps on the board, that may get it going again. It's fairly easy. The amps are much more difficult to replace (lots of pins) but they typically do not short out the 5 V rail.
Quoted from ejacques:Somewhat related....do you think either of these would solve garbled speech? (MNF). I can hear it but it's garbled.
That is much more likely a flakey or failing ribbon cable. Reseat it or flip it around from sound <-to-> MPU as a test. Could be a bad RAM chip on the MPU, depending on what sounds are failing.
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