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10. Go to “Completing the parts replacement” on page 57.
Replacing the heat sink and fan assembly
Attention
Do not open your server or attempt any repair before reading and understanding the Chapter 1 “About this
manual” on page 1
and the Safety Information book. To obtain a copy of the Safety Information book,
go to:http://www.lenovo.com/support
This section provides instructions on how to replace the heat sink and fan assembly.
CAUTION:
The heat sink and fan assembly might be very hot. Turn off the server and wait three to
ve minutes to let the server cool before removing the server cover.
To replace the heat sink and fan assembly, 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. Remove the server cover. See “Removing the server cover” on page 30.
3. Lay the server on its side for easier access to the system board.
4. Locate the heat sink and fan assembly. See “System-board internal connectors” on page 25.
5. Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system
board. See “System-board internal connectors” on page 25.
6. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the
system board:
a. Partially remove screw 1 , then fully remove screw 2 , and then fully remove screw 1 .
b. Partially remove screw 3 , then fully remove screw 4 , and then fully remove screw 3 .
Note: Carefully remove the four screws from the system board to avoid any possible damage to the
system board. The four screws cannot be removed from the heat sink and fan assembly.
44 ThinkServerHardware Maintenance Manual