How can I stop a button sticking on my Sharp XE-A102 till?

Either clean out the keyboard if it has any liquid damage, or replace the keyboard membrane if it is worn. Sometimes the key guides get worn and the keyboard housing needs replacing.
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If anyone needs a manual for a Sharp XE-A102, it can be found here:

http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A102_operating_and_programming_manual.html

Registerman
March 2011