IBM ThinkPad 340 Series Hardware Maintenance Manual page 280

Notes:
1. If the IC DRAM cards or the DIMM are not installed
and the base plate is installed instead of these card,
remove the plate as follows:
a. Pinch the projection ▌1▐ on the left side of the
plate; then pull the plate slightly toward the front
▌2▐.
b. Raise the rear portion of the plate ▌3▐ and
remove it.
2. When inserting the DIMM into either connector on the
DIMM adapter:
a. Locate the triangle ▌2▐ on the right side of the
socket.
b. With the notched end of the DIMM ▌1▐ toward
the triangle, insert the DIMM into the socket.
c. Pivot the DIMM until it snaps into place.
If you have another DIMM to install, insert it in
the other socket the same way.
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