Lenovo RackSwitch G7000 Installation Manual page 26

SEE STEP 5
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5. Loosen and remove the M6 screws, washers, and clip nuts are used to connect the front mounting
brackets to the front and rear posts in the rack.
6. Slide the redundant power supply out of the rack.
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Lenovo RackSwitch G7000 Redundant Power Supply Installation Guide