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how can i fix an error E1 on sam4s?

when I turn it on and touch any button , it starts peeping and show E1 error.
khaled, November 2013
no

ben, January 2019
no, not the clear button or cancel. when I turn it of and back on the beeping goes away ,but when I touch the other button it won't respond like numbers. when I touch the rest it starts beeping again. how can rest the whole thing to factory setting or something like that. thanks

khaled, November 2013
Does it happen when you press the clear button?

Registerman, November 2013
link Click here to see other fixes for Sam4s ER-920.