Acer Aspire X3990 Acer Aspire X3990 Desktop Service Guide - Page 50
Removing the Mainboard, Release these cables away from Chassis clip.
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Removing the Mainboard 1. Disconnect the front USB cable and front audio cable from the mainboard. 2. Release the cable from retention clip,then take out the retention clip. 3. Release these cables away from Chassis clip. Chapter 3 42