Lenovo 30BY User Manual page 110

Although there are no moving parts in your computer after the power cord has been disconnected, the
following warnings are required for your safety and proper Underwriters Laboratories (UL) certification.
CAUTION:
Keep fingers and other parts of your body away from hazardous, moving parts. If you suffer an injury,
seek medical care immediately.
DANGER
Disconnect all power cords from electrical outlets before removing the computer cover or any part
that has the above label attached.
To remove and install the power supply assembly, do the following:
1. Prepare your computer. See "Preparing your computer and removing the computer cover" on page 61.
2. To remove the power supply assembly, do the following:
a. Disconnect the power supply assembly cables from the system board and all drives. See "Parts on
the system board" on page 6.
b. Release the power supply assembly cables from the cable clips and ties.
c. Lay the computer on its side and remove the four screws at the rear of the chassis that secure the
power supply assembly. Then slide the power supply assembly to the front of the computer and then
lift it out of the chassis.
Figure 76. Removing the screws for the power supply assembly
3. To install the power supply assembly, do the following:
a. Ensure that the new power supply assembly is the correct replacement.
b. Install the new power supply assembly into the chassis so that the screw holes in the power supply
assembly align with those in the chassis.
c. Install and tighten the four screws to secure the power supply assembly.
Note: Use only screws provided by Lenovo.
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P520c User Guide