IBM System x3650 M4 BD Type 5466 Installation And Service Manual page 269

13. Loosen the nine screws that secure the system board to the chassis.
Figure 179. 9 screws
14. Grasp two holders and slightly lift the system board.
Figure 180. System board removal
15. Gently push the external input/output connectors out of their respective holes
in the chassis.
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Chapter 6. Removing and replacing components