Oki COREFIDO B822dn User Manual page 313

6
Hold the toner cartridge so that the blue lever is on the left side.
7
Align the triangle marks on the left and right of the toner cartridge with the triangle marks inside
this machine, and install it along the groove.
8
Rotate the blue lever on the left side of the toner cartridge in the direction of the lock mark until it
stops.
If the toner cartridge is not installed correctly, the toner cartridge lever will not rotate.
9
Close the front cover firmly with your both hands.
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