I have a Pro-43 scanner.  Some buttons on the keyboard appear to
be going bad as I have to press them hard in order for the internal
contact to be made.  The worst are the SCAN and LIGHT buttons, the
MANUAL, "3" and "2" keys a little less troublesome, and the rest
working perfectly.
Today I opened up the scanner and went down to the final PC board,
removing it so that I could examine the rubber keypad.  The backside
of the pad appears to be clean, and I didn't see any noticeable wear.
I additionally cleaned the contacts on the PC board itself with a
q-tip slightly moistened with alcohol.  Upon reassembling the unit,
very little improvement was noticeable.
My question is; what is wrong with the scanner, or what is most
likely wrong with it?  I know that there are no breaks in the PCB
traces, etc., albeit the scanner IS modified, else these buttons
would not work at all.  Is it possible for the rubber keypad to be
worn, even though it doesn't look so?  If this is a good possibility,
what is the RS part number for the keypad?  I know that they are $5
or so from reading other posts here, but don't have a number.
Either way, any information you scanner gurus could pass my way
would be greatly appreciated.  If worse comes to worse, I don't
want to give my scanner to RS for repair; I've heard that they can
undo cell mods this way, and don't even want to take the chance.
Brian Petersen
brpeter@ix.netcom.com
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