Epson EPL-N7000 - Manual (Page 234)

Installing Options 223
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Caution:
❏ Make sure to move the main unit of the 4-Bin Mailbox toward
the rear of the printer before opening the front cover.
And make sure to pull the unit back to the original position
after closing the front cover, so that the unit sits on the rear
half of the printer.
❏ Make sure to pull out the stopper after opening the front cover
to secure it, as shown below.