Hi. you need to log yourself back on as an operator. If it has A,B,C,D buttons, press one of those. If it has a CLERK or CLK# buttton, type a logon code (1 by default) and press the clerk button.
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If anyone is looking for a Samsung ER-5215m manual,
http://the-checkout-tech.com/manuals2/cashregisters/samsung1.php
Mark
February 2010