IBM ThinkPad T40 series Hardware Maintenance Manual page 78

Removing and replacing a FRU
When installing: Insert the notched end of the DIMM into
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MT 2373/2374/2375/2376/2378/2379
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the socket. Press the DIMM firmly, and
pivot it until it snaps into the place.
Make sure that it is firmly fixed in the
slot and does not move easily.
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