Hi. If you've reset it, then it is often caused by a faulty printer. They are a very cheap and nasty printer and they don't usually make it past a couple of years. The print wheel is probably having trouble printing in that column. Might not be worth fixing. Printer is sold as one piece by most dealers/ brands.
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Anyone looking for a samsung / Sam4s ER-150? Theres one here:
http://the-checkout-tech.com/manuals/cashregisters/samsung1.php
Mark
April 2010