Lenovo 3057 Maintenance Manual page 193

CAUTION:
The heat sinks and microprocessors might be very hot. Turn off the server and wait three to five
minutes to let the server cool before removing the server cover.
Before you begin, print all the related instructions or ensure that you can view the PDF version on another
computer for reference.
Note: Depending on the model, your server might look slightly different from the illustrations in this topic.
To replace the system board, do the following:
1. Remove all media from the drives and turn off all attached devices and the server. Then, disconnect all
power cords from electrical outlets and disconnect all cables that are connected to the server.
2. If the server is installed in a rack cabinet, remove the server from the rack cabinet and place it on a flat,
clean, and static-protective surface. See the Rack Installation Instructions that comes with the server.
3. Remove the hot-swap redundant power supplies. See "Installing or replacing a hot-swap redundant
power supply" on page 131.
4. Remove the server cover. See "Removing the server cover" on page 85.
5. Remove the cooling shroud. See "Removing and reinstalling the cooling shroud" on page 93.
6. Record the component locations, cable connections, and cable routing in the server.
7. Remove the system fan cage with the installed system fans as a whole by lifting the system fan cage
straight up and out of the chassis.
Figure 140. Removing the system fan cage with system fans
8. Remove the two riser card assemblies. See "Replacing the riser card assembly 1" on page 163 and
"Replacing the riser card assembly 2" on page 165.
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Chapter 6 Installing, removing, or replacing hardware
179