Sure, but the discussion was also about over-draw on the Sanwa:
The Sun Model 3 PSUs in Sega cabs have a separate 10-pin connector for +3.3V:
There's only two pins for +3.3V on the Sanwa, which isn't ideal. And if the pins are making poor contact (due to dirt, oxidation, or whatever reason), that's what you can end up with.what "something else" are you thinking? because that looks like a classic over-draw burn to me.looks like something else happened there...
The Sun Model 3 PSUs in Sega cabs have a separate 10-pin connector for +3.3V: