Toshiba Magnia 550D User Manual page 38

Connecting Components
4 Align the pins of the additional CPU module with the holes in the CPU socket, and
gently press the CPU module into the socket.
WARNING: Do not touch the raised center of the CPU.
Inserting the CPU module
5 Press the lock lever down until it locks into the CPU socket.
Press down the lock lever
Adding a secondary CPU module
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