Apple emac ati usb2 2005 Service Manual

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eMac ATI Graphics/ USB 2.0/2005 Take Apart - 51
 Logic Board
Procedure
1.
Disconnect the optical data cable, the optical power cable and release the heatsink 
clip. Note:  On education models the optical cables are not present because there 
isn’t an optical drive. 
2.
Remove the down converter screw that attaches to the chassis frame.