Xerox 4540 Service Manual - Page 178

12. Ensure that the foam strip under the heat sink area is intact and that it has not been removed, loosened, or damaged. This foam strip is critical to proper air flow. 13. Carefully position the heat sink onto the CPU, aligning it with the mounting posts to reduce movement after it makes initial contact with the layer of thermal grease. Note - The heatsink is not symmetrical and it must be aligned before you place it on the CPU. Turn the heatsink so that the "Lever Side" label and arrows imprinted on the top of the heatsink are pointing to the side of the CPU socket that has the release lever. Also note that the half of the Sun Microsystems logo imprinted on the top of the heatsink will create a complete logo when correctly aligned with the adjacent heatsink. 14. Reinstall the heat sink by using a No. 2 Phillips screwdriver to secure the two screws. a. Tighten one screw two to three turns and then tighten the other screw two to three turns. b. Alternate between the two screws until they are firmly attached. 15. Return the system controller cover and tighten the three captive screws. 16. Replace the cable management arms and return the system controller to the server. ▼ To Replace the GRASP Board (X4500) (FRU) This section describes how to remove and replace the Graphics Redirect and Service Processor (GRASP) board also known as the service processor board. Tip - If you replace the GRASP board, the SP MAC address label on the system controller handle will no longer be correct. Create a label for the new SP MAC address and place it over the existing label. Note - After you replace the GRASP board FRU, you must use the servicetool command to update FRU information about the board. See Section 3.6, "Servicetool FRU Update Procedure" on page 3-8. The GRASP board has one status LED. See Section C.3, "GRASP Board LED (Sun Fire X4500)" on page C-13 for the LED location. 3-58 Sun Fire X4500/X4540 Server Service Manual • May 2010