How to mend Samsung 4615 Cash Reg

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

Samsung er4615 closed?

Cash Register?

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

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Memory All Clear a Samsung ER-4615?

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

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

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

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I need to reset my Samsung Cash Register?

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How do I mend Samsung ER4615?

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