HP LaserJet M3027 Multifunction Printer series - Manual (Page 249)

6. Hold the DIMM by the edges, and align the notches on the DIMM with the DIMM slot. (Check that
the locks on each side of the DIMM slot are open.)
7. Press the DIMM straight into the slot, and press firmly. Make sure the locks on each side of the
DIMM snap into place.
NOTE: To remove a DIMM, first release the locks.
ENWW Install memory 237