Dell C3760dn Color Laser Printer User Manual page 339

10 Make sure that the arrow marks on the transfer belt unit and the printer face each other, and then insert the unit
into the printer until it clicks.
11 Close the top cover.
12 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.
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Maintaining Your Printer