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Figure 31. Installing the microprocessor
11. Lower the new microprocessor straight down into the microprocessor socket on the system board.
12. Close the microprocessor retainer and lock it into position with the small handle to secure the new
microprocessor in the socket.
13. Reinstall the heat sink assembly. See “Replacing the heat sink assembly” on page 90.
14. Reinstall the system board shield. See “Removing and reinstalling the system board shield” on page 83.
15. Go to “Completing the parts replacement” on page 108.
Replacing the card reader
Attention: Do not open your computer or attempt any repair before reading and understanding the
“Important safety information” on page 1
This section provides instructions on how to replace the card reader.
Note: The card reader is available only in some models.
To replace the card reader, 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. Place a soft, clean towel or cloth on the desk or other at surface. Hold the sides of your computer and
gently lay it down so that the screen is against the surface and the cover is facing up.
3. Remove the computer cover. See “Removing the computer cover” on page 75.
4. Locate the card reader in the computer. See “Locating major FRUs and CRUs” on page 66.
5. Remove the system board shield. See “Removing and reinstalling the system board shield” on page 83.
6. Disconnect the card reader cable from the card reader.
94 ThinkCentre E73z Hardware Maintenance Manual