Enlight EN-898X - Manual (Page 9)

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5 Align the board by making sure the standoffs with shoulders are
inserted into their matching holes on the board.
6 Mount the board to the chassis by inserting the mounting screws
supplied with the chassis through the holes on the server board.
CPU Bracket:
To remove the CPU bracket:
Nip the hook of the bracket and pull the bracket, and then the
bracket is divorced from the hole of pedestal, pull right.
To mount the CPU bracket:
Nip the hook of the bracket, aims at the bridge type hook on the
pedestal to pull left.
The pedestal is used to support the Intel Xeon CPU.