Dell Inspiron 620 (Mid 2011) - Manual (Page 25)

4. Connect the chassis fan cable to the system board connector, FAN_SYS1 (see System Board Components ).
5. Replace the computer cover (see Replacing the Computer Cover ).
Processor Fan and Heat-Sink Assembly
Removing the Processor Fan and Heat-Sink Assembly
1. Follow the instructions in Before You Begin .
2. Remove the computer cover (see Removing the Computer Cover ).
3. Disconnect the processor fan cable from the system board connector, FAN_CPU (see System Board Components ).
4. Using a flat-blade screwdriver, loosen the four captive screws that secure the processor fan and heat-sink assembly to the system board.
5. Lift the processor fan and heat-sink assembly out of the computer.
Replacing the Processor Fan and Heat-Sink Assembly
1. Follow the instructions in Before You Begin
2. Clean the thermal grease from the bottom of the heat-sink.
3. Apply new thermal grease to the top of the processor.
4. Place the processor fan and heat-sink assembly over the processor.
WARNING: Despite having a plastic shield, the processor fan and heat-sink assembly may be very hot during normal operation. Ensure that it has
had sufficient time to cool before you touch it.
CAUTION: The processor fan and heat-sink assembly is a single unit. Do not try to remove the fan separately.
CAUTION: When you remove the processor fan and heat-sink assembly, lay it upside down or on its side to avoid damaging the heat-sink thermal
interface.
1 processor fan cable 2 processor fan and heat-sink assembly
3 captive screws (4)
CAUTION: Ensure that you apply new thermal grease. New thermal grease is critical for ensuring adequate thermal bonding, which is a
requirement for optimal processor operation.