Epson AcuLaser C3000 Series User Manual page 186

7. Turn the toner cartridge knobs to the locked position.
Note:
Hold the knobs with both hands and turn them until they click.
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8. Remove the protective tape, pulling straight up from the toner
cartridge.
186
Maintenance and Transportation
Caution:
Be sure to turn the knob all the way to the locked position.
Otherwise, you may have toner problems or leakage.