Selftest setting 18 has been set to 03?
(Topic ID: 154380)
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1 week later
Quoted from justenough:Thanks, Everyone for the info. Replaced the two 6821s and the AY-89XX. No luck, Do you think I might have a Bad ROM When you push the test button 5 times it is supposed to play game over and keep playing it. I just get noise on and off. When I turn the game on for the first time I get noise and that's it. Then it says Eight Ball Deluxe. The same noise I get when I first turn it on and game over is the same.
this game was just sitting for about three years. I am going to replace all the IC sockets not looking forward to that. Thanks Steve.
Why do you think you have a bad IC?
The fact that it says "eight ball deluxe" proves that all ic's in the voice part are functioning correctly.
And the fact that is boots shows all the major IC's are working as well.
Quoted from justenough:Barak, Thanks for the info. And yes when I push the diag button it plays a bunch of calls and then it reboots. If I push the test button on the coin door for it to say game over I get a buzz on and off.
Sounds to me like your soundboard is working perfectly.
The signals coming from the MPU are probably faulty.
Do all the solenoids work properly? The signals from the MPU to the soundboard are the same as to the momentary solenoids.
The signals coming from the MPU to the soundboard are also very short (2 nybbles of 100 usec and 1000+ usec respectively), so the signals may give problems when the connectors are having bad connection-problems (corrosion on U11 on the MPU perhaps???)
1 week later
My guess is still in the direction of U11 on the MPU, or the connections between U11(MPU) and the soundboard interface.
Or the interface IC for those signals on the S&T (U16).
U10 must be good since it produces sound.
Can you test with another S&T or MPU? That would at least show which board is causing problems.
BTW: a S&T soundboard does make background noise (as in sounds / hums / perhaps even an explosion-wannabe), but don't expect any clear melody for that kind of machine.
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