cash register samsung 4915?

Usually caused by a jamming paper roll (make sure roll is not too big for holder, or most commonly the feed clutch in the printer needs replacing. Take it to a dealer for this repair.
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If anyone needs a manual for a Samsung ER-4915, go here:

http://the-checkout-tech.com/manuals/cashregisters/samsung1.php

Registerman
July 2010