How to mend Samsung Er6540

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Cash Register?

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

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Samsung er290?

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

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

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does not print full amount on till entry?

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How do I mend Samsung ER4615?