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5. Reinstall all the 11 screws that secure the main bracket to the front bezel.
6. Reinstall the optical drive. See “Installing an optical drive” on page 82.
7. Reinstall the heat sink assembly. See “Installing the microprocessor and heat sink assembly” on page 90.
8. Close the system board shielding. See “Closing the system board shielding” on page 76.
9. Go to “Completing the FRU installation” on page 109.
Replacing the microprocessor and heat sink assembly
CAUTION:
The microprocessor and heat sink assembly might be very hot. Turn off the computer
and wait three to ve minutes to let the computer cool before opening the computer cover.
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 microprocessor and heat sink assembly.
88 ThinkCentre Hardware Maintenance Manual