Dell Precision 400 Service Manual (.pdf) - Page 102
Processor SEC Cartridge/Heat Sink Assembly, follow these steps
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Processor SEC Cartridge/Heat Sink Assembly shroud tabs (2) SEC cartridge release latches (2) SEC cartridge thumbscrews (2) heat sink guide bracket assembly alignment slot Figure 5-26. Shroud and SEC Cartridge/Heat Sink Removal To remove a processor single-edge contact (SEC) cartridge/heat sink assembly, follow these steps: 1. Remove the expansion-card cage. 2. Place the computer on its side on a flat surface, with the floor stand off the edge of the surface. 3. Rotate the power supply away from the processor airflow shroud. 4. Remove the airflow shroud from the processor(s). Squeeze both pairs of tabs on top of the shroud and lift it out of the chassis. WARNING: The processor SEC cartridge/heat sink assembly can get extremely hot. Be sure the assembly has had sufficient time to cool before you touch it. 5. Unscrew and remove the two thumbscrews that secure the heat sink to the system board. 6. Press the SEC cartridge release latches inward until they snap into position. 5-26 Dell WorkStation 400 Systems Service Manual