Lenovo ThinkSystem SR850 V2 Maintenance Manual page 211

• When replacing the system board, always update the server with the latest firmware or restore the pre-
existing firmware. Make sure that you have the latest firmware or a copy of the pre-existing firmware
before you proceed.
• Go over "Installation Guidelines" on page 107 to ensure that you work safely.
• Turn off the server and peripheral devices and disconnect the power cords and all external cables (see
"Power off the server" on page 12).
• If the server is installed in a rack, slide the server out on its rack slide rails to gain access to the top cover,
or remove the server from the rack.
Watch the procedure. A video of this procedure is available from the following links:
• https://www.youtube.com/playlist?list=PLYV5R7hVcs-C6QgmsUMRG6ul0bHzrGmsG
•
https://list.youku.com/albumlist/show/id_54461099
Procedure
Step 1. Make preparations for this task.
a. Record all system configuration information, such as Lenovo XClarity Controller (XCC) IP
addresses, vital product data, and the machine type, model number, serial number, Universally
Unique Identifier, and asset tag of the server.
b. Save the system configuration to an external device with Lenovo XClarity Essentials.
c. Save the system event log to external media.
d. Remove the top cover (see "Remove the top cover" on page 214).
e. Remove the fan cage assembly (see "Remove the fan cage assembly" on page 130).
f. Remove the system board air baffle (see "Remove the system board air baffle" on page 200) or
the processor and memory expansion tray and the expansion tray air baffle (see "Remove the
processor and memory expansion tray" on page 190).
g. Disconnect all the cables from the system board. Make a list of each cable as you disconnect it
and use it as a checklist after installing the new system board.
h. Remove the PCIe riser assemblies (see "Remove the PCIe riser assembly" on page 157).
i. Remove all the adapters from the system board (see "Remove an adapter" on page 160 and
"Remove the OCP Ethernet adapter" on page 155).
j. Label the slot number on each memory module, remove all the memory modules from the
system board, and set them aside on a static-protective surface for reinstallation (see
"Remove a memory module" on page 148).
Important: It is advised to print out the layout of memory module slots for reference.
k. Remove the power backplane (see "Remove the power backplane" on page 167).
l. Remove both the PHMs that are installed on the system board (see "Install a processor and
heat sink" on page 185).
Step 2. Disengage the system board.
.
Chapter 4 Hardware replacement procedures
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