Lenovo NeXtScale n1200, Installation And Service Manual

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Note: You have to reactivate the Features on Demand (FoD) after replacing the system board.
3. When you replace the system board, you must either update the server with the latest firmware or
restore the pre-existing firmware that the customer provides on a diskette or CD image. Make sure that
you have the latest firmware or a copy of the pre-existing firmware before you proceed.
To remove the system board, complete the following steps.
Step 1. Remove the cover (see “Removing the cover” on page 142).
Step 2. Remove the cross brace.
Cross brace
Figure 113. Cross brace removal
Step 3. Remove the interposer filler (1 captive screw).
Step 4. Remove any of the following components that are installed on the system board and put them in a
safe, static-protective place:
Risers and adapters (see “Removing the optional PCI or ML2 adapter” on page 156)
DIMMs, DIMM covers, and DIMM fillers (see “Removing a DIMM” on page 143)
Note: Make a note of the location of each DIMM as you remove it, so that you can later reinstall it in
the same connector.
Power distribution board and air baffle (see “Removing the power distribution board” on page 165)
Remove the water loop (see “Removing a copper water loop” on page 170)
Microprocessors (see “Removing a microprocessor” on page 180)
Notes:
1. Transfer microprocessors into new system board before removing the old system board.
2. Remove the socket covers from the microprocessor sockets on the new system board and
place them on the microprocessor sockets of the system board you are removing.
3. Do not allow the thermal grease to come in contact with anything, and keep each heat sink
paired with its microprocessor for reinstallation. Contact with any surface can compromise the
thermal grease and the microprocessor socket.
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Lenovo NeXtScale nx360 M5 water-cooled technology tray Lenovo NeXtScale n1200 Enclosure Installation and Service Guide