the receipt tape is sticking while printing out a receipt printing lines start to print over already printed line

Lori Granum, July 2010

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