Epson EPL-8000 User Manual page 205

6. Make sure the front of the printer faces the same way as the
front of the cassette. Then align the printer with the cassette
using the two alignment pins, shown below. These pins fit into
the two holes on the bottom of the printer. Lower the printer
until it rests on the cassette unit.
7. Plug the power cord back into the printer and into an electrical
outlet. Also re-attach the interface cable.
8. Turn the printer on. On the right of the display, you see both
the size of paper in the standard cassette and the size of paper
in the lower paper cassette unit.
READY:P LY-3 -- A4
If you use A4 size in the optional cassette and the standard
cassette is empty, you see the above display.
For information on using this option, see "Using the Optional
Lower Paper Cassette" in Chapter 4 and "Level 1 Options" in
Chapter 3.
The Lower Paper Cassette Unit
Options 7-15