User`s manual

Figure 5-5. Installing the toner cartridge
7.
Now hold the green toner cartridge lock lever down while you
lower the left side of the toner cartridge. Then release the lock
lever to lock the cartridge into place. (See Figure 5-6.)
Caution
Do not press on the top of the toner cartridge because toner may spill
into the printer. Instead, press on the edge of the cartridge as shown. If
toner does spill into the printer, you must remove it with a small
vacuum cleaner.
Figure 5-6.
Locking the cartridge info place
Maintenance and Status Messages 5-9