Epson C2600/2600 Owner's Manual page 322

5. Take the cap off and cover the hole for the waste toner
collector with it.
Note:
If you need to set the waste toner collector down, place it on a flat
surface with the capped side facing up to prevent the toner content
from spilling out.
6. Turn the blue knob on the front of the photoconductor as
shown below.
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Replacing Consumable Products