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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
link Click here to see other fixes for Sharp J2500S.