Toshiba Magnia Z300 - Manual (Page 105)

Installing and Removing Hardware
CPU module
83
8 Align the CPU pins correctly with the holes in the 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.
9 Push down the lock lever of the socket until it is hooked
securely.
Pushing down the lock lever
10 Detach the cover from the thermal seat on the contact surface
between the heat sink and the CPU module.