Epson ActionLaser Plus User Manual page 29

Assembling the Printer
8. Hold the developer unit horizontally, with the toner cartridge
label right side up. Gently shake the unit back and forth a few
times to distribute the toner.
9. Install the drum unit (lifting it by its green handles) and the
developer unit in the basket. The drum unit goes closer to the
orange tab.
Setting Up the Printer 1-15