How to Remove a CPU and Heatsink Assembly (FRU)

Use this procedure to replace a CPU. A CPU replacement kit contains a CPU, an alcohol wipe, and a syringe of thermal compound. When you replace a CPU, the heatsink is reused. Do not discard the heatsink.

A procedure for using the Fault Remind button to diagnose CPU failure is available in the Sun Server X2-8 (formerly Sun Fire X4800 M2) Diagnostics Guide.

An animation of the procedure to remove a CPU is available. See animation showing CPU removal.

Before You Begin

• About Sun Server X2-8 CPU Modules and CMOD Filler Modules

• CPU and Heatsink Assembly Overview

• CPU Designations

1. Prepare the server for service. See How to Prepare for Service.
2. Remove the CMOD from the server. See How to Remove a CPU Module (CMOD).
3. Set the CMOD on a flat antistatic surface with ample surrounding space and light.
4. Remove the CMOD cover. See How to Remove the CPU Module (CMOD) Cover.
5. Use the motherboard-mounted blue Fault Remind button to identify the CPU and heatsink assembly that you need to remove.
6. Press down on the center of the heatsink and use a No. 2 Phillips screwdriver to completely loosen the two spring-loaded captive heatsink retaining screws.

   Pressing down on the heatsink relieves the pressure generated by the spring-loaded screws.

   
   
7. To remove the heatsink, slightly twist it left and right to break the adhesive seal created by the thermal compound.

   The thermal compound between the top of the CPU and the bottom of the heatsink acts as a mild adhesive.

8. Set aside and retain the heatsink, taking care that you do not allow the residual thermal compound on the bottom of the heatsink to contaminate other components or the work space.
9. To unlock the CPU retaining cover, push down on the spring-loaded release lever and move it slightly away from the CPU and the release lever retaining clip.
   
10. Lift the release lever to its fully upright position.
11. Lift the CPU retaining cover to its fully upright position.
12. Lift the CPU from the socket.
13. Set the CPU aside, taking care that you do not allow the residual thermal compound on the top of the CPU to contaminate other components or the work space.

See Also

How to Install a CPU and Heatsink Assembly (FRU)