CAUTION:Never remove the cover on a power supply or any part that has the following label attached.Hazardous voltage, current, and energy levels are present inside any component that has this labelattached. There are no serviceable parts inside these components. If you suspect a problem withone of these parts, contact a service technician.To replace the power supply assembly, do the following:1. Prepare your computer. See “Preparing your computer and removing the computer cover” on page 95.2. Disconnect the power supply assembly cables from the system board and all drives. See “Parts on thesystem board” on page 34.3. Release the power supply assembly cables from the cable clips and ties.4. Lay the computer on its side and remove the four screws at the rear of the chassis that secure thepower supply assembly. Then slide the power supply assembly to the front of the computer and then liftit out of the chassis.Figure56. Removing the screws for the power supply assembly5. Ensure that the new power supply assembly is the correct replacement.6. Install the new power supply assembly into the chassis so that the screw holes in the power supplyassembly align with those in the chassis.7. Install and tighten the four screws to secure the power supply assembly.Note: Use only screws provided by Lenovo.8. Connect the power supply assembly cables to the system board and each of the drives.9. Secure the power supply assembly cables with the cable clips and ties in the chassis.Chapter 9. Installing or replacing hardware 123
