Xerox 4540 Service Manual - Page 176

Note - Mixing CPU speeds or mixing dual-core CPUs with single-core CPUs is not supported. Use two identical CPUs in your server. Note - Align the triangle that is printed on one corner of the CPU with the tiny triangle that is imprinted on the CPU socket, as shown in the red circle in FIGURE 3-27. a. Ensure that the CPU socket release lever is in the fully open, vertical position. b. If re-using the existing heatsink, clean and regrease it. Caution - New heatsinks have a layer of thermal grease applied at the factory. Adding additional thermal grease can damage the system. Follow this step only if you are re-using a previously installed heatsink. c. Use an alcohol pad to clean all the old thermal grease from the component surface. Also, clean the dust from the heatsink fins. Caution - Ensure that the thermal grease in the syringe supplied with the CPU is pliable and not stiff. If your syringe of grease has aged, the grease might be too stiff to adequately spread out and ensure thermal conductance. d. Using one syringe of thermal grease (0.2 ml/0.5 g), carefully apply grease to the top of the CPU in three lines in the pattern shown in FIGURE 3-27. Note - Two syringes of thermal grease are supplied with the new CPU, but use only one syringe for each CPU. Apply the grease in the pattern shown in FIGURE 3-27. 3-56 Sun Fire X4500/X4540 Server Service Manual • May 2010