Help needed - SNES Ascii pad behaves very strangely

[ChurchOfSolipsism]

Mate of mine gave me an old Ascii-pad he found in a thrift shop. First I thought it was completely broken, but it turns out that out of all buttons, one (the B-button) still works: if you press it, the pad behaves as if all buttons are pressed. (used Windows 7 and a cheap SNES/ USB-converter to pinpoint the problem, but as far as I could see, when I plugged it into my SNES the problem was the same).

Took a look inside, and apart from lots of dirt everything (switches, contacts etc.) it looks ok. Anybody got any idea what might be wrong?

[thomas_surles]

Have you tried a light sand paper on the button contact? My nes controller looked fine but it wasnt until i sanded it that it started working correctly.

[pbj]

Sand the contacts, wipe down the pcb with lighter fluid.  If it doesn’t work after that it’s either the controller or your adapter at fault.

[ChurchOfSolipsism]

Great, cheers fellas, will do that!

[ChurchOfSolipsism]

Damn. I cleaned the ---steaming pile of meadow muffin--- out of the sucker, sanded the contacts etc. but to no avail, it behaves exactly like it did before I tried fixing it. Oh well, you can't win 'em all...