Dell OptiPlex 3070 Tower Service Manual page 60

Installing heatsink assembly
1. Align the screws of the heatsink assembly with the holders on the system board and place the heatsink assembly on the
processor [1].
2. Tighten the captive screws to secure the heatsink assembly to the system board [2].
NOTE: Tighten the screws in a sequential order (1,2,3,4) as printed on the system board.
3. Connect the heatsink fan assembly cable from the connector on the system board [3].
60 Removing and installing components