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Microprocessor

Dell™ OptiPlex™ GX400 Service Manual

  Removing the Microprocessor

  Replacing the Microprocessor

Removing the Microprocessor

CAUTION: Before you perform this procedure, see "Precautionary Measures."

NOTICE: Before disconnecting a device from the computer or removing a component from the board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components."

1. Turn off the computer and devices, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover.
   
   
2. Lay the computer down on its right side.
   
   
3. Rotate the power supply away from the system board.
   
   
4. Remove the airflow shroud.
   
   
5. Remove the microprocessor heat sink:
   
   
   1. For each of the metal clips that secure the heat sink to the microprocessor, press down on the clip's latch to release it from the heat-sink retention base. Then lift the clip away from the heat sink.
      
      
   2. Lift the heat sink away from the microprocessor.
      
      

NOTE: If you are installing a microprocessor upgrade kit from Dell, return the original heat sink assembly and microprocessor package to Dell in the same package in which your upgrade kit was sent. Your microprocessor upgrade kit should include a replacement microprocessor heat sink and two replacement securing clips.

NOTE: The bottom of the heat sink is coated with thermal grease that conducts heat from the microprocessor to the heat sink. Some of this grease will remain on the microprocessor when you remove the heat sink.

NOTICE: While you are replacing the microprocessor, lay the heat sink down with the thermal grease facing upward. Do not lay the heat sink down with the thermal grease touching the work surface.

Removing the Microprocessor Heat Sink

6. Remove the microprocessor from its connector.
   
   

Your microprocessor uses a ZIF socket with a lever-type handle that secures or releases the microprocessor.

To remove the microprocessor, pull the socket lever straight up until the microprocessor is released. Then remove the microprocessor from the socket.

Removing the Microprocessor

Replacing the Microprocessor

NOTICE: Do not reuse the old heat sink assembly when replacing the microprocessor package. Doing so can cause the microprocessor to overheat because of an inadequate amount of thermal compound between the heat sink assembly and the microprocessor package.

1. Install the new microprocessor in the socket:
   
   
   1. Remove the plastic cover that is attached to the bottom of the new heat sink assembly.
      
      
   2. Ensure that the lever on the microprocessor socket is fully extended to the release position.
      
      

NOTICE: When you place the microprocessor in the socket, ensure that the microprocessor aligns properly with the socket. You must position the microprocessor correctly in the socket to avoid damage.

3. Align pin 1 of the new microprocessor with pin 1 of the socket.
   
   

NOTE: Pin 1 of the microprocessor is indicated by a small dot or a triangle in one corner of the microprocessor. Pin 1 of the socket is indicated by a small triangle in one corner of the socket. See "Replacing the Microprocessor."

4. Carefully set the microprocessor in the socket and press it down lightly to seat it.
   
   
5. Rotate the socket lever back toward the socket until it snaps into place, securing the microprocessor.
   
   

Replacing the Microprocessor

2. Install the microprocessor heat sink:
   
   

NOTICE: If you are installing a microprocessor upgrade kit from Dell, remove the plastic cover that is attached to the bottom of the new heat sink before installing it.

1. Lower the heat sink to the microprocessor so that the heat sink fits in the heat sink retention base.
   
   
2. For each of the replacement metal clips that secure the heat sink to the microprocessor, fit the end of the clip that does not have the latch to the heat sink retention base. Then, press down on the clip's latch to secure the clip to the heat sink retention base (see "Removing the Microprocessor Heat Sink").
   
   

3. Replace the airflow shroud.
   
   
4. Rotate the power supply back into position until the securing tab snaps into the release latch.
   
   
5. Replace the computer cover and restart the computer.
   
   
6. Enter system setup, and confirm that the top line in the System Data area correctly identifies the new microprocessor. Also, confirm that the values under the CPU Information menu are correct for the new microprocessor.
   
   
7. Exit system setup, and then run the Dell Diagnostics to verify that the new microprocessor is operating properly.
   
   

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