Epson EPL-N7000 Reference Manual page 37

4. Check if the paper size detector is set to the size of the paper
you are loading.
In the illustration above, the paper size detector is set to A3.
If your paper cassette is in the same condition and you are
loading A3 paper, proceed to step 7.
To set the paper size detector to other sizes, proceed to the
next step.
5. Raise the gray stopper located at the right end of the paper
size detector, and push the detector to the right. Then, pull up
the left end of the paper size detector to remove it from the
paper cassette.
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Paper Handling