Epson 1290 - Manual (Page 24)

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3. To uncurl the paper, roll the paper inside the protective film
packaged with the printer in the direction opposite to the
paper’s curl, as shown below.
4. Remove the paper support and lower the output tray. Then,
turn on the printer.
5. Attach the roll paper holder to the printer. Adjust the first left
of slot in the back of printer and insert roll paper holder into
slots.