How to mend Samsung Cash Register E1 Error

My Samsung ER 650 screen is black?

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

fixing key issues on a samsung ER 5100?

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

How do I clear an error code pp?

Cash Register?

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

How can i clear extra lines appearing on screen?

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

Memory All Clear a Samsung ER-4615?

cash registers ER-4615?

samsung 4615 cash reg ?

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

samsung er290 cash register?

Samsung ER-5100?

How do I mend Samsung ER4615?

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

Samsung er4615 closed?

change tax for er4940 samsung?

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

samsung er150?

closed message? samsung er-4615?

Samsung ER 4915 not working?

Battery?

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

Samsung er290?

does not print full amount on till entry?

I need to reset my Samsung Cash Register?

how can i fix my Samsung ER290 cash register?

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