Lenovo 20HGS3KN00 User Manual page 132

1. Disable the built-in battery. See "Disabling the built-in battery" on page 109.
2. Ensure that the computer is turned off and disconnected from ac power and all cables.
3. Close the computer display and turn the computer over.
4. Remove the base cover assemlby. See "Replacing the base cover assembly" on page 110.
5. To remove the USB subcard assembly, do the following:
a. Detach the connector
b. Remove the screws that secure the USB subcard assembly
c. Remove the USB subcard assembly
6. To install the USB subcard assembly, do the following:
a. Install the new USB subcard assembly in place
b. Install the screws to secure the USB subcard assembly
c. Attach the connector
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