These instructions apply to all models of Epson Prep and Receipt Printers including the following models TM-TM88V, TM-M30, TM-U220B, TM-T70II

If a receipt or prep printer stops working the first step is to check the paper is correctly loaded in the printer,
once this has been checked a printer reset (below) is a best next step before contacting support.
 

How to Reset a Epson Receipt or Prep Printer 

1) Switch off printer using the Front 'Rocker Switch' Power Button
2) Press the "FEED" button down and then switch on, keep holding the feed button down until a test sheet is printed, then release feed button
3) Press the "FEED" button once more and release, a second test sheet will print4
4) Switch off printer for 10 seconds then switch back on (Do not skip this step)

The Printer will now be reset