HP LaserJet 4345 Multifunction Printer series - Manual (Page 289)

6. Remove the DIMM from the antistatic package. Hold the DIMM with your fingers against
the side edges and thumbs against the back edge. Align the notches on the DIMM with
the DIMM slot. (Check that the locks on each side of the DIMM slot are open, or outward.)
7. Press the DIMM straight into the slot (press firmly). Make sure the locks on each side of
the DIMM snap inward into place. (To remove a DIMM, the locks must be released.)
8. Close the formatter door.
9. Replace the formatter cover.
ENWW Installing memory 275