Sharp XE-A102 till, working fine except the number 4 button is sticking, meaning that it doesn't always register when pressed. Causing some bad adding up!

Any ideas gratefully received!

Steph Jansen, March 2011

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