How to mend Lcd Dark Samsung

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

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

My Samsung ER 650 screen is black?

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how can i fix my Samsung ER290 cash register?

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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I need to reset my Samsung Cash Register?

How can i clear extra lines appearing on screen?

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

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does not print full amount on till entry?

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

How do I mend Samsung ER4615?

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can non-upc codes function be disabled for samsung sps 520 register?

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

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

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Memory All Clear a Samsung ER-4615?