Hey all, I am trying to get an old pinbot up and running for the first time in 20+ years. I am getting no sound at all, including a lack of the startup tones. Can somebody give me some insight to what I might try?
- First, know that the game does enter the attract mode correctly, and the game is playing correctly as well.
- I am getting a hum through the speakers so I would assume the amp and speakers are working. There is a change in pitch to the hum as various lights and solenoids fire.
- There is no battery acid damage on this MBU, and I have removed the battery holder and installed a U25 RAM replacement to hold scores.
- I checked the wiring multiple times and every thing seems to be in order.
- I re flowed all of the header pins involved.
- I have all new Pinbot sound Roms installed.
- U23 gets really hot, like, to the point where you can't touch it. I heard that U23 can be diagnosed by the sound test, but that would require the power on tones to be working correct?
- To confirm, no music, no voices, no sounds
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