Can you post a picture of your CPU board?
(Topic ID: 242823)
Linked Games
Millionaire
Williams, 1987
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May want to go over the IC pins with a pink pencil eraser if it acts up again. But be careful not to put too much pressure on the legs and bend them.
I had found quite a few bad Hitachi 6802 (that brand you have in U24 now) fail. Hopefully, this is not one of those such times.
3 years later
Quoted from interconnect:Getting +12 and ~ -13.3 or -13.4. Varies a bit.
It is good. That is an unregulated 12 volts so it will vary.
Quoted from interconnect:Any other ideas?
Just one idea. With the game off, turn the volume pot up/down 10 times and try it again.
Quoted from ROMM:Occasionally when I power the machine up, it will lock up when booting, and the “bong” tone will be in a constant loop.
What are 5v, 12v and -12 volts measuring on the power supply?. This is an original power supply board? Mind posting a picture of it?
Have you reseated your ribbon cable between the MPU and sound board?
So you have an original Williams MPU installed? If so, mind posting a picture of it?
Quoted from interconnect:Have new volume pot on sound board.
There is not a volume control a system 11 A or B original sound board that I am aware of. Edit: I see pictures of your Bad Cats in the link and you have an aftermarket sound board. Never seen that one before, but I would not expect an issue with that sound board.
I would be talking about a volume control inside the cabinet. Turn it both ways 10 times while power is off.
Rottendog MPU boards are notorious for different sound issues mostly because of design issues, so likely issue is cause of it.
What is wrong with your original MPU board?
I really suggest creating a new repair thread. This thread was created by the OP for his specific game. You have a unique situation that does not involve even the original Williams boards anymore. Makes things more complicated.
Quoted from interconnect:I originally posted it here because I have the literal exact same issue as the OP
Does not sound like the same issue to me. Seems far from it.
Quoted from interconnect:Background sound randomly dropping out while sound effects continue to work and all sound returns on the next ball on a System 11 machine doesn’t sound the same to you? That’s literally the exact same issue I have.
If so, then why is not yet repaired?
Same similar symptoms don't always equal same repair results
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