IBM System x3300 M4 Installation And Service Manual page 442

11. Remove the microprocessor 2 expansion board side bracket.
12. If you are instructed to return the microprocessor 2 expansion board, follow
If you have other devices to install or remove, do so now. Otherwise, go to
"Completing the installation" on page 104.
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System x3300 M4 Type 7382: Installation and Service Guide
a. Loosen the thumbscrew on the side bracket.
b. Release the side bracket from the hole on the system board.
all packaging instructions, and use any packaging materials for shipping that
are supplied to you.
Attention: Make sure to place the socket cover for the microprocessor socket
on the microprocessor 2 expansion board before returning the microprocessor
2 expansion board.