Introduction
This machine uses the:
Apple 630-2883 Original APPLE-MAC Airport 802.11B Wireless Card from the 700 MHz machine through the eMac (ATI Graphics). After that it uses the Apple M8881LL/A AirPort Extreme Card.
Tools
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Press the eject arrow located on the upper right corner of your keyboard. Once the optical drive tray is open, gently hold it and shut down the machine.
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Remove the two Phillips screws located to the right and left sides of the optical drive tray.
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Gently remove the panel from the front of the eMac
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Disconnect the AirPort cable from the optical drive panel.
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Pull the AirPort card straight away from its socket in the eMac.
 
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Slide the new AirPort card into the slot until its firmly seated.
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Reconnect the AirPort cable to the optical drive panel.
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Reattach the optical drive panel and restart the eMac.
 
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To reassemble your device, follow these instructions in reverse order.