Williams Time Warp (System 6) Sound dies...

CoindoorDave

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When it's first turned on, all sounds are present for the first couple balls...then the it's like life support is yanked and the pitch and volume die down to silence. Unplugging and re-plugging in the power molex connector (upper right corner of sound board) brings the sound back very briefly, but once the machine is warmed up - the sounds don't return.

Replaced the 40-pin connector between the driver and CPU (there were some visibly bad connections...slight acid damage from batteries long ago removed). Even replaced 4 elec. caps on the sound board.

I have the complete schematics.
 
Problem will be isolated to the sound card. It has its own integrated power supply, CPU and everything. Other than the input signal from the driver board, running off the solenoid circuits, it's a stand-alone board design. No speech board either, so that helps.

You said it tapers off, losing volume until it quits? It doesn't just instantly die, correct?

The question really is if it's going to be the audio amp or the voltage regulator. So when it gets warmed up, test the voltages and see if they are all in-spec. Hit both fuses with an ohmmeter too, could be a barely failing fuse.

-Hans
 
> You said it tapers off, losing volume until it quits? It doesn't just instantly die, correct?

Correct. Almost like a turntable that lost power and the record spins slowly to a stop, decreasing in pitch and volume. After it dies, there's still slight hum in the speakers (like something isn't completely grounded - this makes me wonder if the amp is OK)

Where's the best places to check the voltages?
 
If it's not the voltages, the next thought would be the DAC. The good news is there really isn't that much to these boards, outside the CPU logic, so as long as the software is running, it's usually easy to track down.

-Hans
 
Finally got back to this...ended up being the 6810 sound proc...at certain "pitches" it'd get hot...added a heatsink & compound (higher pitched sounds cooled it off) and now it's playing fine....might be a band-aid, but good enough for now. All voltages measures fine, all caps replaced, made no diff...the heatsink seemed to work....for now ;-)
 
Well - heatsink bought a little extra time. Problem's returned...could the sound processor be to blame? Does anyone sell replacements? I seen it listed as a 6806/02...is that a "6806 or 6802" or is the "/02" part of the "part number"?
 
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