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Samsung ER-5115 programming?

I have a used Samsung ER-5115 cash register that doesn't allow me to make changes to the PLU keys (status, price, or characters). I have the "P" key and the manual but it always gives an error indication and tone. Do I need to clear previous settings before changing>? Can I reset to factory defaults?
Mike, November 2010
I need help on programming or adding a price to a plu. Cleared all existing plu's creatednew ones but want to add price, how do I do it?

Lorencia Botha, October 2011
link Click here to see other fixes for Samsung.