1. With the computer on a soft cloth and the bottom shield facing up, remove four screws, as shown.
Note: When reassembling the computer, note that the screw beneath the magnet is smaller than the other three screws. Be sure to install the magnet over the screw.
5. Peel up the speaker wire tape, but make sure that the speaker wire beneath it remains in place. Set aside the speaker wire tape.
Note: When reassembling the computer, reuse the speaker wire tape.
7. Warning: Avoid pressure on the optical drive rail. The space between the drive rail and the rightmost screw (shown below) is very tight. When removing that screw, putting pressure on the drive rail can damage the drive. If necessary, refer to the Optical Drive procedure, "Transferring the Drive Door" to remove the drive door first; then slide in the optical drive tray and remove the screw.
Turn over the computer, and slide out the optical drive tray. Remove the small screws near the DC connector and visible under the drive rail.
8. Warning: When performing this step, make sure the speaker cable and power switch cable are not strained.
Turn over the computer. Starting near the left speaker end of the top case, lift up the top case near the front. Tilt the top case so that it clears the DC connector.
Tilt the top case up away from the computer latch.
9. With the top case loosened, note how the speaker cable is routed.
Note: When reassembling the computer, ensure that the shrink tubing section of the speaker cable sticks to the top shield and is routed as shown.
12. Remove the top case from the computer.
Note: When installing the replacement top case, make sure you attach the case over the DC connector first. Then connect the power switch cable connector followed by the speaker cable connector. Do not strain the cables.
14. Important: Make sure you transfer the original serial number label and Ethernet label from the old top case to the replacement top case. You can use a black stick to carefully peel up a corner of the label. Then peel off the label completely and apply it to the replacement top case. Make sure that the labels lie completely flat so they do not interfere with the battery compartment.
15. Install the replacement top case, and reassemble and test the computer.
Warning: When reassembling the computer, be careful not to pinch any cables as you press the top case back onto the computer. Check that the top case shows no raised surfaces and is fully snapped into place before installing the remaining screws.
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