Lenovo ThinkStation C30 Hardware Maintenance Manual page 130

10. Remove the other seven screws that secure the side cover as shown in the following illustration. Then,
lift the side cover and remove it from the computer.
Figure 62. Removing the side cover
11. Disconnect the power supply assembly cables from the system board and the drives. In some models,
you might need to disconnect the power supply assembly cables from the PCI cards.
12. Do the following to remove the power supply assembly from the computer:
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ThinkStation Hardware Maintenance Manual