Epson AcuLaser C9100 Reference Manual page 195

4. Lock the two casters at the front of the unit.
For 500-sheet Paper Cassette Unit A3, secure the printer to the
unit with the fittings provided.
1500-sheet Paper Cassette Unit A3
Warning:
w
Be sure to lock both casters before installing the unit on the
printer. Otherwise, the unit may move and cause an accident.
5. Pull out the top paper cassette from the unit, and then secure
the printer to the unit with the two screws provided.
6. Reinstall the removed cassette to the printer.
500-sheet Paper Cassette Unit A3
Installing Options
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