Lenovo 5457 Installation And Service Manual page 312

System board
(7 screws)
Figure 231. System board screw removal for 4U server model with non-hot-swap power supplies
12. Slightly lift the system board at the side that is near the hard disk drive cage to create a small angle of
elevation between the system board and chassis.
Figure 232. Slightly lifting system board for 4U server model with non-hot-swap power supplies
Lenovo System x3100 M5 Installation and Service Guide
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System borad