Lenovo T420 Maintenance Manual page 87

Table 18. Removal steps of DIMM (in the slot under the keyboard) (continued)
When installing: Insert the notched end of the DIMM into the socket. Press the DIMM irmly, and pivot it until it
snaps into place. Make sure that it is irmly ixed in the slot and does not move easily.
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Chapter 8 Removing and replacing a FRU