I have this exact problem just only that the fire button didn't work when I got it. I was wondering how long it took to get your buffer from the site that you have suggested? Also what is the best site for buying these parts?
It isn't a bad controller, PCB, or sodder joint and I thought it may be a bad component on the board. My only problem is that I can't a blueprint or any diagram that I can trace and find the components that are part of the fire button mechanism.
I picked up a CX-2600 from a garage sale and was eager to play and it worked perfectly until I had my friend play with me. This is when I found out that the right controller port's fire button didn't work. I was thinking it may be something with the 16 pin bug or the diodes and was wondering if I should order this kit to repair it.