How to mend Samsung Er-550

My Samsung ER 650 screen is black?

does not print full amount on till entry?

Battery?

Samsung er290?

How do I clear an error code pp?

fixing key issues on a samsung ER 5100?

cash registers ER-4615?

How do I mend Samsung ER4615?

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

Samsung ER 4915 not working?

Samsung ER-5100?

samsung er290 cash register?

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

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

samsung 4615 cash reg ?

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

Samsung er4615 closed?

I need to reset my Samsung Cash Register?

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

Cash Register?

closed message? samsung er-4615?

How can i clear extra lines appearing on screen?

Memory All Clear a Samsung ER-4615?

how can i fix my Samsung ER290 cash register?

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

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

change tax for er4940 samsung?

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

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

samsung er150?