Dell External M620 t Owner's Manual page 45

Figure 14. Installing and Removing a Heat Sink
1. screws (4)
2. heat sink
6. Use a clean, lint-free cloth to remove any thermal grease from the surface of the processor shield.
CAUTION: The processor is held in its socket under strong pressure. Be aware that the release lever can
spring up suddenly if not firmly grasped.
7. Position your thumb firmly over the socket-release lever near the label marked OPEN 1st and release the lever from
the locked position by pushing down and out from under the tab.
8. Similarly, release the socket-release lever near the label marked CLOSE 1st from the locked position. Rotate the
lever 90 degrees upward.
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