Epson Action Laser II - Manual (Page 131)

Replacing Consumable Parts
9. Insert the toner cartridge into the printer by sliding it gently into
the opening until it locks in place.
10. Close the front cover.
11. Insert the paper cassette.
Each time you replace the toner cartridge, you should replace the
ozone filter and clean the transfer charger wire as described next.
Maintenance and Transportation 6-7