3. Remove the fan (3).
Reverse this procedure to install the fan.
USB board
NOTE: The USB board spare part kit includes a cable.
Description Spare part number
For use only on computer models equipped with WWAN capability (includes Media Card Reader
slot and WWAN module slot)
744781-001
For use only on computer models not equipped with WWAN capability (includes Media Card
Reader slot)
740151-001
Before removing the USB board, follow these steps:
1. Turn off 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 the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
Component replacement procedures
35
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