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How do I fix my sam4s cash register ?

My cash register continually beeps and the screen says sequence error, none of the keys work what can I do .
It is a sam4s er 380m
Teresa, March 2016
If you press the clear (C) button, the error should clear. If not, you probably have a keyboard fault

Registerman, March 2016
link Click here to see other fixes for Sam4s ER380M.