Xerox AltaLink C81 Series User Manual page 251

Maintenance
b. Press the waste toner transport unit toward the printer, until both ends click into place.
c. To lock the waste toner transport unit, rotate the locking lever 45 degrees clockwise.
9. Close the printer front cover.
Xerox ® AltaLink ® C81XX Series Color Multifunction Printer 251
User Guide