Lenovo THINKCENTRE 8177 Bedienungsanleitung PDF herunterladen (Seite 119)

microprocessor.” Continue to the next step after installing the heat sink and

microprocessor on the new system board.

8. Install the new system board into the chassis and insert the screws.

9. Reconnect all cables to the system board. See “Identifying parts on the system

board” on page 108.

10. Go to “Installing the cover and connecting cables” on page 116.

Removing and replacing the microprocessor

1. Turn off the computer and peripheral devices and disconnect all external

cables and power cords; then, remove the cover. See “Removing the cover” on

page 106.

2. Remove any air baffles or ducts that cover the microprocessor.

3. Disconnect the heat sink fan cable from the system board. Refer to

“Identifying parts on the system board” on page 108.

4. Loosen the two captured screws 3 holding the fan and heat sink in place,

and pivot them to the side.

5. To remove the fan and heat sink 1 from the microprocessor 2, gently twist

the fan and heat sink to break the seal formed by the thermal grease and

remove.

Note: If the thermal grease seal cannot be broken, you may want to start up

the system to heat the processor and loosen the thermal grease.

6. Place the heat sink on a clean work surface.

7. Take notice of the orientation of the beveled corner on the microprocessor.

This is important when reinstalling the microprocessor on the system board.

8. Release the microprocessor from the system board by pulling outward and

lifting the small handle on the microprocessor socket to its maximum vertical

position. Carefully lift the microprocessor off the socket.

9. Make sure that the microprocessor socket handle is fully in the vertical

position. Otherwise the microprocessor pins might be damaged when

installing the microprocessor.

10. Position the microprocessor so that the pins are aligned with the socket and

with the beveled corner in the correct orientation.

Chapter 9. Replacing FRUs (Types 8149, 8177, and 8178) 113

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Lenovo THINKCENTRE 8177 Bedienungsanleitung Seite 119