Dell C3760dn Color Laser Printer User Manual page 330

5 Reinsert the removed waste toner box.
CAUTION:
If the waste toner box does not fit into place properly, make sure that the transfer belt unit is fully inserted.
6 Turn the waste toner box lock lever 90-degrees clockwise to lock the waste toner box.
7 Close the right side cover.
NOTE:
After replacing the transfer belt unit, be sure to initialize its life counter by following the instructions in the
accompanying manual.
328
Maintaining Your Printer