Lenovo x3550 M5 Installation And Service Manual page 284

Battery holder
Figure 205. Battery or power module holder location for 3.5-inch hard disk drive server models
Step 14. Loosen the two thumbscrews (one is near PCI slot 1 and one is near PCI slot 2).
System board handle
Figure 206. Thumbscrews disengagement
Step 15. Grasp the system board handles and slide the system board toward the front of the server until it
stops.
Note: Make sure that the system board disengages from all system-board standoffs.
Step 16. Slightly push the system board toward the hot-swap fans; then, grasp the system board handles
and carefully lift it up from the chassis, being careful not to damage any surrounding components.
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Lenovo System x3550 M5 Installation and Service Guide
Thumbscrew
System board handle
Thumbscrew