IBM ThinkPad 755CX Manual page 162

Increasing Memory Capacity
Note:
The base plate should have been
removed and stored when you
installed the DIMM adapter.
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IBM ThinkPad 755CX User's Guide
10
Pinch the levers
and install it as shown.
11
Push the base plate forward to click it into place.
on the left side of the base plate
2
1
2
1