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

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

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

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How do I clear an error code pp?

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samsung er150?

does not print full amount on till entry?

I can't open the drawer. It has a squeal like a key is stuck?

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