Replacing The Wi-Fi Card - Lenovo 300 Maintenance Manual

Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O)
cables, and any other cables that are connected to the computer. Refer to "Left and right view"
and "Rear view" for help with locating the various connectors.
Step 4. Remove the stand base. Refer to "Removing the stand base".
Step 5. Remove the foot cover. Refer to "Removing the foot cover".
Step 6. Remove the hinge. Refer to "Removing the hinge".
Step 7. Remove the rear cover. Refer to "Removing the rear cover".
Step 8. Remove the EMI cover. Refer to "Removing the EMI cover".
Step 9. Disconnect the speaker cables from the connector on the motherboard.
Step 10. Remove the four screws that secure the speaker system to the chassis, then lift up the speaker
system to remove it.
Step 11. To install the new speaker system:
a. Place the new speaker system into position, then secure it with four screws.
b. Connect the new speaker cables to the connector on the motherboard.
Step 12. Reattach the EMI cover, rear cover, hinge, foot cover and stand base.

Replacing the Wi-Fi card

Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
Note: It may be helpful to place the computer face-down on a soft flat surface for this procedure. Lenovo
recommends that you use a blanket, towel, or other soft cloth to protect the computer screen from scratches
or other damage.
To replace the Wi-Fi card:
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating
system, and turn off the computer and all attached devices.
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Lenovo All-In-One 300 Computer Hardware Maintenance Manual