Samsung CLP 550 - Manual (Page 148)

M AINTAINING Y OUR P RINTER 6.18
10 Hold the handle of the new imaging unit with the green
roller facing you. Align the imaging unit with the slots in
your printer so that the colors on both sides of the imaging
unit slide into the corresponding colors of the slots.
C AUTION : Insert the imaging unit carefully so as not to scratch
and damage the surface of the green roller.
11 Slide the imaging unit down into the printer until it cannot
be pushed in any further and fold the handle down.