Epson Action Laser - Manual (Page 125)

Maintenance Messages
13. Hold down the green button. Pressing down on the toner
cartridge, firmly slide the hooks on the cartridge into the slots on
the developer unit. Then release the button to lock the cartridge
into place. (You should see a second green button pop up to lock
in the cartridge.)
14. Now reinstall the basket. With the top cover of the printer open,
align the arrow on the back of the basket with the arrow on the
printer case. (The arrows point toward each other when the unit
is properly installed.) Gently lower the basket into place.
Maintenance and Transportation 6-9