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the nx 5400 uniwell flat keyboard?

the cash register goes on but if you press the keys they make a peep sound but do not show on the screen what can i do
christwell, May 2015
It sounds like it may have lost the program due to a flat or faulty battery. It is difficult to get any programming info for Uniwell registers. One of the users has a programming manual here which may help:

https://the-checkout-tech.com/manuals/cashregisters/Uniwell1.php

Registerman, May 2015
link Click here to see other fixes for Uniwell.