Lenovo ThinkStation P900, Hardware Maintenance Manual, Page: 173 / 218

7. To install a new memory module, position the new memory module over the memory slot. Ensure that
the notch 1 on the memory module aligns correctly with the slot key 2 on the system board. Push the
memory module straight down into the slot until the retaining clips close.
Note: Do not touch the circuit board of the memory module.
Figure 82. Installing the memory module
8. Reinstall the direct cooling air baffle. See “Removing and reinstalling the direct cooling air baffle” on
page 128.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 183.
Replacing the heat sink and fan assemblies
Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter
1 “Read this first: Important safety information” on page 1.
CAUTION:
The heat sink and fan assembly might be very hot. Before you open the computer cover, turn off the
computer and wait several minutes until the computer is cool.
Depending on your computer model, your computer might be installed with one or two heat sink and
fan assemblies.
To replace the heat sink and fan assemblies, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See “Removing the computer cover” on page 111.
3. Remove the direct cooling air baffle. See “Removing and reinstalling the direct cooling air baffle” on
page 128.
4. Lay the computer on its side for easier access to the heat sink and fan assembly.
5. Locate the heat sink and fan assembly that does not work properly. See “Locating components”
on page 30.
6. Disconnect the heat sink and fan assembly cable from the system board.
Chapter 11
.
Installing or replacing hardware
165