Epson EPL-N7000 - Manual (Page 232)

Installing Options 221
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11. Attach four output trays to the main unit by inserting the pins
on both sides of the trays into the grooves on the main unit.
Note:
Attach the bottom tray first. Then proceed to attach the one above
it, until you reach the top tray.
12. Reconnect all interface cables and the power cord.
13. Plug the printer’s power cord into an electrical outlet.
14. Turn on the printer.