Dell ChengMing 3990 Service Manual page 47

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Steps
1. Lift the hard drive caddy support away from the system board
2. Remove the eight screws (6-32xL6.35) and one standoff screw (6-32xL4.8) that secure the system board to the computer
[1].
3. Push the system board towards the front of the system
Disassembly and reassembly
47

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