Lenovo ThinsStation P320 Hardware Maintenance Manual page 168

Figure 126. Disconnecting the Bluetooth cable
4. Remove the rear Wi-Fi antenna. See "Rear Wi-Fi antenna" on page 159.
5. At the rear of the computer, press the release button
Figure 127. Opening the PCIe card latch
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P320 Hardware Maintenance Manual
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to open the PCIe card latch
2
.