Dell Vostro 420 Service Manual page 33

Replacing the Processor Heat Sink/Fan Assembly
NOTICE:
1. Apply thermal solution to the heat sink as needed.
2. Align the four captive screws on the heat sink/fan assembly with the holes and rubber bushings on the system board.
1 Phillips screwdriver
3 heat sink/fan cable
5 screw holes with rubber bushings
3. Tighten the captive screws evenly to secure the heat sink/fan assembly to the system board.
NOTICE:
4. Attach the heat sink/fan assembly cable to the system board (see
5. Follow the procedure in
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Unless a new heat sink is required for the new processor, reuse the original heat sink/fan assembly when you replace the processor.
2 heat sink/fan assembly
4 system board fan connector
6 captive screws (4)
Ensure that the assembly is correctly seated and secure.
After Working on Your Computer.
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System Board Components).