How to mend Samsung Sp-1000

my samsung er-150 cash register makes a high pitched alarm sound on switch ?

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

does not print full amount on till entry?

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

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

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How do I mend Samsung ER4615?

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