Epson EPL-N7000 Reference Manual page 35

The paper sizes and types supported by the optional 500-Sheet
Universal Paper Cassette Unit A3 are the same as the standard
paper cassette. For more information, see "Optional 500-Sheet
Universal Paper Cassette Unit A3" on page 17.
Follow these steps to load paper into the standard and optional
paper cassettes. The illustrations show the standard cassette.
1. Pull the paper cassette out until it stops.
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Paper Handling