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USB/audio board
Description Spare part number
USB/audio board 721542-001
Before removing the USB/audio board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 36).
5. Remove the following components:
a. Service door (see
Service door on page 37).
b. Keyboard (see
Keyboard on page 49)
c. Optical drive (
Optical drive on page 41)
d. Top cover (see
Top cover on page 53)
Remove the USB/audio board:
1. Position the top cover upside-down.
2. Disconnect the cable that routes to the system board (1).
3. Disconnect the cable that routes to the fingerprint reader board (2).
4. Remove the Phillips PM2.5×4.0 screw (3) that secures the USB/audio board to the computer.
5. Rotate the top of the board upward, pull the board away from the connectors (to remove them from top
cover holes), and then lift the board off the top cover (4).
Component replacement procedures 65
75


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