My best-condition 83-key keyboard suddenly developed a
bum spacebar, right
in the middle of writing some documentation. Before I unscrew the
Jim, this is a very common failure. The spacebar - beyond the switch -
has a small "C" supporter that keeps the bar horizontal and makes any
pressure in any point of the bar activate the switch. Take a look at the bar
unassembled and you'll see it. A common (!) failure is when this supporter
falls out and the bar only works if you press right in the middle.