Thermal greaseThe thermal grease must be replaced whenever the heat sink has been removedfrom the top of the microprocessor and is going to be reused or when debris isfound in the grease.About this taskWhen you are installing the heat sink on the same microprocessor that it wasremoved from, make sure that the following requirements are met:v The thermal grease on the heat sink and microprocessor is not contaminated.v Additional thermal grease is not added to the existing thermal grease on theheat sink and microprocessor.Notes:v Read the safety information that begins on “Safety” on page vii.v Read the “Installation guidelines” on page 33.v Read “Handling static-sensitive devices” on page 36.To replace damaged or contaminated thermal grease on the microprocessor andheat sink, complete the following steps:Procedure1. Place the heat sink on a clean work surface.2. Remove the cleaning pad from its package and unfold it completely.3. Use the cleaning pad to wipe the thermal grease from the bottom of the heatsink.Note: Make sure that all of the thermal grease is removed.4. Use a clean area of the cleaning pad to wipe the thermal grease from themicroprocessor; then, dispose of the cleaning pad after all of the thermal greaseis removed.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.Microprocessor0.02 mL of thermalgreaseFigure 74. Thermal grease distribution92 IBM System x3550 M4 Type 7914: Installation and Service Guide
