Selecting The Paper Size - Epson EPL-N2010 Reference Manual

Otherwise, open the front cover, and remove any paper
remaining in the MP Tray. Insert a sheet or stack of the correct
size paper into the MP Tray with the printable side up, as far
as it will go. Adjust the paper guides to match the paper size
you are loading.
5. Send a print job from your application. The control panel
display shows Manual Feed and the selected page size.
6. Press On Line to print. The sheet of paper is loaded and
printed.
7. Press On Line again to print the next page of print data, if
necessary. Repeat this step for every page to be printed.

Selecting the paper size

By default, the printer driver is set up for A4 size paper to be
loaded. If you load paper of a different size, you need to change
the paper size setting using one of the following methods.
Using the printer driver:
Choose the paper size on the Printer Settings menu or the Paper
menu. For more information on using the printer driver, see
online help in the driver.
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Paper Handling