Toshiba Magnia Z500 - Manual (Page 97)

Installing and Removing Hardware
CPU module
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10 Raise the lock lever of the expansion CPU socket.
Raising the lock lever
11 Align correctly the mark of CPU module with the mark of
socket and insert the CPU module as far as it will go.
Inserting the CPU module
NOTE: A standard CPU module is installed in the socket 1.
To extend the CPU module, install it in the socket 2.