5. Use the thermal-grease syringe to place 9 uniformly spaced dots of 0.02 mLeach on the top of the microprocessor. The outermost dots must be withinapproximately 5 mm of the edge of the microprocessor; this is to ensureuniform distribution of the grease.Note: If the grease is properly applied, approximately half of the grease willremain in the syringe.6. Install the heat sink onto the microprocessor as described in “Replacing amicroprocessor and heat sink” on page 243.Removing the system boardUse this information to remove the system board.About this taskNote:1. Before you replace the system board, make sure that you backup any featureson demand (FoD) keys that were enabled. Remember to re-enable the featureson demand (FoD) keys after installing the new system board. For moreinformation on Features on Demand (FoD), including instructions forautomating the activation and installation of the activation key by using IBMToolsCenter or IBM Systems Director, see the IBM Features on Demand User'sGuide at /http://www.ibm.com/systems/x/fod/ under the Help section.2. When you replace the system board, you must either update the server withthe latest firmware or restore the pre-existing firmware from a diskette or CDimage. Make sure that you have the latest firmware or a copy of thepre-existing firmware before you proceed.Before you remove the system board from the server, take the following steps tosave data, firmware, and configuration data:v Record all system configuration information, such as IMM IP addresses, vitalproduct data, and the machine type, model number, serial number, UniversallyUnique Identifier, and asset tag of the server.Microprocessor0.02 mL of thermalgreaseFigure 177. Thermal grease distributionFigure 178. SyringeChapter 6. Removing and replacing components 251
