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How do I fix my uniwell NX5400 cash register?

In closing my sales, the electricity went off and this error came out
E1-01. How do I fix it? It's not in the manual.
Jeannine, June 2015
I am I. Baguio city. Can you recommend someone.

Jeannine, June 2015
It is most likely caused by a weak battery that has not been replaced on time. When the power goes off, your whole programming gets corrupted. Battery life is around 3 to 5 years for most machines. See a dealer to have it checked.

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