Dell 3010cn Color Laser Printer - Manual (Page 43)

Inserting the cartridge
a. Guide the cartridge until it snaps into place.
b. Push down the handhold to lock the cartridge in place.
4. If replacing just one toner cartridge, close the front door and you are finished.
5. Repeat steps 1 through 4 when inserting the remaining cartridges.
CAUTION: Do not do not force the cartridge.
CAUTION: If you find it difficult to push down the handhold, remove the cartridge and insert the cartridge again.
NOTE: Make sure the toner cartridge is installed correctly. Otherwise, the front door cannot close firmly.