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

I need to reset my Samsung Cash Register?

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Memory All Clear a Samsung ER-4615?

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

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

Paper in my Samsung ER4915 jammed. Now it doesn't work at all?

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