Dell Precision 3431 Service Manual page 89

5. Insert the hook on the I/O panel into the slot on the chassis and rotate to close the I/O panel [1].
6. Replace the screw to secure the I/O panel to the chassis [2].
7. Connect the power switch cable [3], route the power cable through the retention clips on the chassis [4], psu cable [5] and, intrusion
switch cable [6] from the connectors on the system board.
8. Install the:
a) M.2 2230 WLAN card
b) SD card reader
c) Intel Optane card
d) M.2 PCIe SSD card
e) Memory module
f) Processor
g) Heat sink and heat sink fan
h) Hard drive and optical drive module
i) Front bezel
j) Side cover
9. Follow the procedure in After working inside your computer.
Removing and Installing components 89