HP ProBook 4320s Notebook PC HP ProBook 4321s ... - Warranty Life

Heat sink and fanNOTE:The heat sink spare part kit includes replacement thermal material.DescriptionSpare part numberFan 599544-001Processor heat sinkFor use with discrete graphics subsystems 599653-001For use with Unified Memory Architecture (UMA) graphics subsystems 599546-001Before removing the heat sink, follow these steps:1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turnthe computer on, and then shut it down through the operating system.2. Disconnect all external devices connected to the computer.3. Disconnect the power from the computer by first unplugging the power cord from the AC outletand then unplugging the AC adapter from the computer.4. Remove the battery (see Battery on page 51).5. Remove the following components:a. Switch cover (see Switch cover on page 53)b. Keyboard (see Keyboard on page 55)c. Palm rest (see Palm rest on page 66)Remove the heat sink:1. Position the computer right-side up with the front toward you.2. Remove the six Phillips PM2.5×3.0 screws (1) that secure the heat shield to the top cover.3. Remove the Phillips PM2.5×5.0 screw (2) that secures the heat shield to the top cover.76 Chapter 4 Removal and replacement procedures