Lenovo 5457 Installation And Service Manual page 319

Attention: When inserting the system board external input/output connectors into their respective holes
in the chassis, make sure the EMC springs are not inserted into the holes. Inserting the EMC springs into
the holes in the chassis could damage the EMC springs.
Figure 242. How to correctly insert EMC springs
6. Align the holes (seven in total) on the system board with the respective standoffs on the chassis.
Standoff
Figure 243. System board alignment with respective standoffs on chassis for 4U server model with non-hot-swap
power supplies
7. Install the seven screws that secure the system board to the chassis.
Standoffs
System board
EMC spring
.
Chapter 6 Removing and replacing components
307