Apple performa 6200.6300 Servicehandbuch

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 REA Procedures
Repair Overview for Freezing and Video Color Hue Issues - 5
 
Why Replace the EMI Clips?    
 
Replacing the EMI clips prevents possible damage to the 
logic board during the installation of expansion boards.
 
Why Replace the Ethernet Card Fence?
 
Installing a hooked fence on the Ethernet card provides a way 
to hold the card more securely in the communications slot.  
Without the hooked fence, the card could rock out of the slot 
and cause intermittent network connection.