Epson AcuLaser C1900 Reference Manual page 172

5. Place the printer onto the 500-Sheet Paper Cassette Unit.
Align each of the printer's corners with those of the unit, then
lower the printer until it rests securely on the unit.
Note:
The printer should be carried by at least two people, holding the
printer with their hands in the indicated positions.
6. Pull out the cassette of the unit.
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Installing Options