DELL NT499 ユーザーズマニュアル

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Adding and Replacing Parts
I/O-Panel Components 
Removing the I/O Panel 
 
NOTE: 
To loosen the two captive screws on each side of the heat-sink assembly, 
you need a long Phillips screwdriver.
1
USB port
2
diagnostic, hard-drive access, 
and network integrity lights
3
headphone connector
4
microphone connector
2
3
4
1