Lenovo x3300 M4 7382 Installation And Service Manual page 294

11. Make sure the microprocessor 2 expansion board release levers are in the open position.
12. Align the holes on the microprocessor 2 expansion board to the guide pins on the system board. Install
the microprocessor 2 expansion board on the system board.
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System x3300 M4 Installation and Service Guide