Dell Precision 3520 Owner's Manual page 25

2. Remove the:
a. base cover
b. battery
3. To remove the heat sink - assembly:
a. Disconnect the heat sink assembly cable and remove the screws (2) that secure on the system board [1, 2]. assembly .
NOTE: Remove the screws that secure the heat assembly sink to the system board in the order of the call outs
shown on the heat [1, 2, 3, 4], 5, 6.
b. Lift the heat sink assembly away from the system board .
Disassembly and reassembly 25