How to mend Samsung Er-2710

How do I get the register key to turn to "P" for updating the sales tax?

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How do I mend Samsung ER4615?

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clear E3 error code on samsung er-290 cash register?

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On screen is 'PCo' and nothing is functioning, how to correct?

Why does the error code E1 show on screen and high pitched?

Operator's Manual - Samsung ER-290 Electronic Cash Register?

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How do I clear an error code pp?

Battery?

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