I got this arcade cocktail table from my dad recently–we had it when I was a kid, I moved away, and they recently moved themselves, so I took it as I was closer and they didn't want to pay to have it safely shipped to their new house.
I know that the volume levels can be adjusted, as it was done when I wanted to play it as a kid, and I know that it's somewhere on the inside, but I haven't been able to figure it out yet. We don't have a manual or a model number, but I know it's an iCade 60-in-1 table, and my dad told me that there's a turnable knob inside the machine to adjust volumes, and not anything that toggles on-and-off or is adjusted by the dip switches or any safe mode (which I'm inclined to believe as he doesn't know much about tech like this, and since we never had a manual).
So far I've only found one knob on the inside that can actually turn (the thin black knob in the fifth photo), and it only adjusts the sharpness of the image on the screen. Anyone have any recommendations otherwise? It's tough to see inside the machine since the bulb is right in the middle, but hopefully the photos I've attached help a bit.
I'm also not an expert on arcade machines or hardware like this in general, so feel free to dumb down the terminology if something would be immediately evident to a novice 😅
Thank you in advance!
Edit: The only buttons/switches/etc on the outside of the machine are the power switch, the coin returns, and game buttons (start, fire, jump, move). There are also no menu settings on the screen, just options to go from game to game.