Epson AcuLaser C8600 Reference Manual page 263

8. Insert the toner cartridge all the way until it stops.
9. Turn the cartridge knob as shown below.
Caution:
c
Be sure to turn the knob all the way to the locked position.
Otherwise, you may have toner problems or leakage.
10. If you need to replace another toner cartridge, repeat steps 3
to 9.
11. Close the front cover.
Replacing Consumable Products
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