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how can i fix my Samsung ER290 cash register?

Battery?

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Cash Register?

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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?

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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How can i clear extra lines appearing on screen?

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

I need to reset my Samsung Cash Register?

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