IBM 7383 Installation And Service Manual page 348

10. Align the microprocessor 2 expansion board to the guide pins on the bottom
11. Align the holes on the microprocessor 2 expansion board to the guide pins on
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System x3500 M4 Type 7383: Installation and Service Guide
9. Make sure the microprocessor 2 expansion board release lever is in the open
position.
of the chassis and the side bracket.
the system board. Install the microprocessor 2 expansion board on the system
board.