I haven't seen that one before but errors that start with EP refer to the printer so you should look for a paper jam or maybe check that you have the right width of paper.
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For those who have asked about a Geller AX-100 manual, one of our users has it here:
http://the-checkout-tech.com/manuals/cashregisters/Towa_AX-100_operating_programming_manual.html
Registerman, March 2013
