How can I fix my Royal Cash Register 600/601sc keys that aren't responsive?

This is usually caused by wear or liquid contamination in the keyboard membrane which is located at the bottom of the keyboard and looks a little like this:

http://velesoft.speccy.cz/samcoupe/keyboard/samcoupe-membrane-full.jpg

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If anyone needs a Royal 600 / 601 manual, go here:

http://the-checkout-tech.com/manuals/cashregisters/royal1.php

Registerman
July 2010