I have a Sharp ER-A470 and it has "printer Error" on the display followed by lots of dots underneath. It has completely frozen and will not do anything. None of the buttons work at all.

Skevi, February 2010

Hi. It means the printer has jammed usually. Have a look in the printer to make sure you don't have a paper jam. Remove the ribbon/ ink cartridge to make sure it is not jammed. Turn power off at wall. Make sure key is on REG mode. Turn on at wall. You'll see the error again. Now press CLEAR (CL) to make the register try the printer again. If it is still faulty, you might have a damaged gear, or a motor failure and it should go in to a dealer to be stripped down.
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For anyone looking for a Sharp ER-A470 manual, there is one here:

http://the-checkout-tech.com/manuals2/cashregisters/Sharp6.php

Mark, February 2010

if you have the disk that came with the printer , install the printer from your pc. and restall it again .

mick, February 2010