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Mend Sharp ER-290 Error Beeping Key

EO error on ER-290?

I have an E0 error and I can't get the beeping to stop.
I have already taken a Z report and turned the key to Z and pressed the clear button. Still beeps everytime I try to add a sale. What am I missing.

Tommy
December 2020
SharpSharp ER-290Office Appliances, Cash RegistersError Beeping Key
It sounds like data corruption. Has the battery been replaced on time?

Registerman
December 2020

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ER-290 E0 Error - Beeping Issue & Fix