Dell C2665dnf Color Laser Printer - Manual (Page 489)

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Slightly pressing down the lock lever on tray1 to the right with one hand, raise the retard roller with the other hand.
Slide the retard roller to the left to remove it from tray1.
Installing a Retard Roller in Tray1
1 Slide the two axles of the retard roller into the holes on tray1.
Press down the retard roller until it snaps.
Maintaining Your Printer 487