Lenovo M50-70 Notebook - Manual (Page 51)

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Lenovo M50-70/M50-80
Figure 7. Removal steps of DIMM (continued)
Note: If only one DIMM is used on the computer you are servicing, the card must
be installed in SLOT-0 ( a : lower slot), but not in SLOT-1 ( b : upper slot).
a
b
When installing: Insert the notched end of the DIMM into the socket. Push the
DIMM firmly, and pivot it until it snaps into place. Make sure that it is firmly fixed
in the slot and is difficult to move.