Try cleaning the circuit traces where the key pads are with a pencil eraser.
You get an oxide film on Copper over time. I have gotten several different
keypads to work this way. Do not use fine sandpaper. It is too rough.
I would get the Copper shiny over all the keypad contact areas and then
use 99% isopropyl alcohol to clean it before reassembling it. I would also 
clean the rubber part with the iso before reassembling it.
                             Richard
... "DOS for dummies"? Isn't that what Windows is?
___ Blue Wave/DOS v2.30 [NR]
--- PCBoard (R) v15.3/M 5
---------------