How to mend Samsung Er-290

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

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Memory All Clear a Samsung ER-4615?

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

how can i fix my Samsung ER290 cash register?

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How do I clear an error code pp?

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

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How do I mend Samsung ER4615?

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

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