Canon Color ImageRunner C3380 Reference Manual page 397

5
Open the front cover of the main unit.
6
Turn the knob that corresponds with the toner color you want
to replace in the direction of the arrow.
Black Toner Cartridge
IMPORTANT
Turn the knob on the toner cartridge until the arrow points to 'Unlock'.
7
Grip the top notch on the toner cartridge, and pull the toner
cartridge out of the toner supply port.
Black Toner Cartridge
Cyan, Magenta, or
Yellow Toner Cartridge
Cyan, Magenta, or
Yellow Toner Cartridge
Replacing the Toner Cartridge
7
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