Eight Ball Deluxe
Bally, 1981EBD sound issue on the S+T. All the Speech works great, and all of the "Fake Chimes" basic sounds work, but I can't get any of the more modern sounds to work. I've set things properly in the setup - 18 set to 3 but still no go. I just get silence or I get the "chimes" sound. ROM or Cap issue? Everything else seems to work fine!
Thanks for the input!
- Matt
The majority of modern sounds including the background audio (when book-keeping #18 is set to "03") come out of the AD558 Digital to Analog Converter (DAC) chip at U10 on the S&T board. Suspect the 2.0uF capacitor C43 (common failure and goes open circuit) which feeds the output of the DAC to the pre-amp. In fact you're probably better off getting a capacitor kit and changing them all on this board - the caps on these S&T boards are known to go bad.
The fake chimes are produced by the AY-3-8912 sound generator chip at U12. The AY-3-8912 also produces the modern sound effects for the "DELUXE" standup targets behind the 1-7 drop target bank, but most of the other modern sounds come out of the DAC.
Quoted from Quench:The modern sounds come out of the AD558 Digital to Analog Converter (DAC) chip at U10 on the S&T board
And, the sockets they used for the AD558 were crappy. I always replace that socket.
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Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info
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Grand Rapids, MI