Dell 1600n Multifunction Mono Laser Printer User Manual page 162

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3. Open the lever on each side of the DIMM slots completely.
4. Remove the memory DIMM from the antistatic package. Locate the alignment notches on the bottom
edge of the DIMM.
NOTE: Avoid touching the connection points along the edge of the memory.
5. Hold the memory DIMM. Align the notches on the DIMM with the notches at the top of the DIMM slot.