How to mend Samsung Er-650/650r

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

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

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

does not print full amount on till entry?

how can i fix my Samsung ER290 cash register?

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

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