Dell Latitude 9420 Service Manual page 29

Steps
1. Align the screw holes on the heat sink with the screw holes on the system board.
2. Tighten the three captive screws that secure the heat sink to the system board.
3. Align and place the CPU shielding cover correctly into the small notches, and press to fit it firmly.
4. Adhere the two pieces of tape securing the gray WWAN antenna cable from the bottom side of the CPU shielding cover.
5. Adhere the piece of conductive tape and the piece of tape securing the system fan cable to the left side of the CPU
shielding cover.
Next steps
1. Install the base cover.
2. Install the SIM card tray.
3. Install the SD card.
4. Exit service mode.
5. Follow the procedure in After working on your computer.
Removing and installing components 29