The I (A Button) turbo function doesn't appear to be working. It acts like it is in the second turbo position, so in games like Ys Books 1 and 2, Adol shoots a slow series of fireballs, which makes the later bosses impossible to beat.
I opened it up, and there is some corrosioin on the metal prongs, but nothing out of the ordinary. It was working before, but I don't know what happened. All I could think of is that I did clean the insides (not the circuit), of any dirt using a damp cloth and the Turbo Fuctions were working after that point.
Anyone have any ideas?