clear button sticks

Check to make sure that the front plate of the console is seated properly....I've seen a few cases where keys get physically stuck if the alignment is off.

Hope this helps.:)

And if Marty's suggestion doesn't solve the problem, the buttons probably need to be replaced.

Mitch

it is a problem replaced the buttons or it is simple?

dol

It requires the old buttons to be de-soldered and the new buttons soldered in place. Applying too much heat to the PCB can cause damage to the traces and vias.