5.1 Servicing the CPU and Heatsink (FRU)

This section describes how to service the CPU and heatsink.

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Caution - These procedures require that you handle components that are sensitive to static discharge. This sensitivity can cause the component to fail. To avoid damage, ensure that you follow antistatic practices as described in 2.3 Performing Electrostatic Discharge and Static Prevention Measures.

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5.1.1 CPU Placement

The server operates with either two or four CPUs. In a two-CPU system, the CPUs must be installed in sockets 0 and 2.

5.1.2 Removing and Installing a Heatsink Filler Panel, CPU Cover Plate, Heatsink, and CPU

Use the following procedures to remove and install a heatsink filler panel, a CPU cover plate, a heatsink, and a CPU.

Remove a Heatsink Filler Panel and CPU Cover Plate

1. Prepare for servicing:
   1. Attach an antistatic wrist strap.

      See 2.3 Performing Electrostatic Discharge and Static Prevention Measures.

   2. Power off the server completely and disconnect all power cords from the server power supplies.

      See 2.6 Powering Off the Server.

   3. Extend the server to the maintenance position.

      See 2.4 Positioning the Server for Maintenance.

   4. Remove the top cover.

      See 2.7 Removing the Server Top Cover.

2. Loosen the two captive screws holding the heatsink filler panel in place.
3. Lift the heatsink filler panel out of the chassis.

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   Caution - Whenever you remove a heatsink filler panel, you should replace it with a heatsink or another heatsink filler panel; otherwise, the server might overheat due to improper airflow.

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4. If you are installing a CPU into a CPU socket where a CPU has never been installed, remove the CPU cover plate:
   1. Disengage the CPU release lever by pushing down and moving it to the side away from the CPU socket, and then rotating the lever upward.
   2. Open the load plate and carefully remove the CPU cover plate.

Remove a Heatsink and CPU

Refer to Fault Remind Button on Air Divider and Removing the Heatsink and CPU when completing the following procedure.

1. Prepare for servicing:
   1. Attach an antistatic wrist strap.

      See 2.3 Performing Electrostatic Discharge and Static Prevention Measures.

   2. Power off the server completely and disconnect all power cords from the server power supplies.

      See 2.6 Powering Off the Server.

   3. Extend the server to the maintenance position.

      See 2.4 Positioning the Server for Maintenance.

   4. Remove the top cover.

      See 2.7 Removing the Server Top Cover.

2. If necessary, identify the location of the faulty CPU by pressing the Fault Remind button on the air divider.
   • If the CPU LED behind the CPU on the motherboard is off: CPU is operating properly.
   • If the CPU LED behind the CPU on the motherboard is on (amber): CPU is faulty and should be replaced.

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     Note - Located above the Fault Remind button is the Fault Remind button Power LED. When the Fault Remind button is pressed, the Power LED illuminates (green) to indicate that the remind circuitry is working correctly.

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     Figure 5-1 Fault Remind Button on Air Divider

     
3. Remove the heatsink:
   1. Unscrew the two Phillips screws from the heatsink.

      Turn the screws alternately one and one half turns until they are fully removed.

   2. Twist the heatsink slightly to break the grease seal, lift off the heatsink and place it upside down on a flat surface to prevent the thermal grease from contaminating other components.
   3. Use an alcohol pad to clean the thermal grease from both the bottom of the heatsink and the top of the CPU.

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      Caution - Whenever you remove a heatsink, you should replace it with another heatsink or a filler panel; otherwise, the server might overheat due to improper airflow.

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      Caution - Failure to clean the heatsink and the CPU prior to removing the CPU could result in accidental contamination of the CPU socket or other components. Also, be careful not to get the grease on your fingers as this could result in contamination of components.

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4. If you are replacing the CPU as well as the heatsink, remove the CPU:
   1. Disengage the CPU release lever by pushing down and moving it to the side away from the CPU, and then rotating the lever upward.
   2. Open the load plate and carefully remove the CPU.
      

      Figure 5-2 Removing the Heatsink and CPU

      

Install a Heatsink and CPU

1. Unpack the installation kit.

   Depending on whether you are adding a new CPU and heatsink, or replacing one or both of these components because they are damaged, your kit might contain the following:

   • CPU and pre-greased heatsink
   • Pre-greased heatsink only
   • CPU only, with syringe to apply thermal grease to existing heatsink
2. If applicable, install the CPU (Installing the CPU).
   1. Properly orient the CPU with the socket alignment tabs and carefully place the CPU into the socket.

      Ensure that the orientation is correct as damage might result if the CPU pins are not aligned correctly.

      
      

      Figure 5-3 Installing the CPU

      
   2. Lower the load plate.

      Ensure that the load plate sits flat around the periphery of the CPU.

   3. Engage the release lever by rotating it downward and slipping it under the catch.
3. Install the heatsink.
   1. If you are reusing an existing cleaned heatsink, use the syringe (supplied with the new or replacement CPU) to apply thermal grease on top of the CPU in a star pattern.

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      Note - You do not need to complete this step if you have a new heatsink since new heatsinks come with thermal grease already applied.

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   2. Orient the heatsink so that the two screws line up with the mounting studs.

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      Caution - When handling the heatsink, be careful not to get the thermal grease on your fingers so as not to transfer the grease to other server components. To do so could cause component contamination and/or damage.

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   3. Carefully position the heatsink on the CPU, aligning it with the mounting posts to reduce movement after it makes initial contact with the layer of thermal grease.

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      Caution - If the heatsink assembly is moved too much during its installation, the layer of thermal grease might not be distributed evenly, leading to component damage.

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   4. Tighten the screws alternately one-half turn until fully seated.
4. Return the server to operation:
   1. Install the top cover.

      See 6.1 Replacing the Server Top Cover.

   2. Return the server to the normal rack position.

      See 6.2 Returning the Server to the Normal Rack Position.

   3. Reconnect all power cords to the server power supplies and power on the server.

      See 6.3 Powering On the Server.

5. If the CPU being installed is replacing a faulty CPU, manually clear the CPU fault using Oracle ILOM.

   For instructions on clearing server faults, refer to the Oracle Integrated Lights Out Manager (ILOM) 3.1 Users Guide.

Install a Heatsink Filler Panel

1. Orient the heatsink filler panel so that the two captive screws line up with the mounting studs.
2. Carefully position the heatsink filler panel on top of the CPU socket.
3. Tighten the two captive screws to secure the heatsink filler panel.
4. Return the server to operation:
   1. Install the top cover.

      See 6.1 Replacing the Server Top Cover.

   2. Return the server to the normal rack position.

      See 6.2 Returning the Server to the Normal Rack Position.

   3. Power on the server.

      See 6.3 Powering On the Server.