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My cash register J2500S is displaying e999 with beeping sounds after a powe?

My cash register J2500S is displaying e999 with beeping sounds after a power failure. What should I do?
Diane, November 2018
Sorry for late reply. I haven't worked with that model but large errors after power cuts are usually related to a faulty battery. If not replaced on time, they can't hold the program in memory during power cuts. Have battery checked.

Registerman, December 2018