Epson AcuLaser C9300N - Page 117

8. Fix the optional paper cassette units with four screws.
9. Reinsert the paper cassette.
10. Reinstall the back cover removed in step 5.
11. If you install three optional paper cassette units, repeat steps 4 to 9.
Epson AcuLaser C9300 Series User's Guide
Installing Options 117