3. Lay the computer on its side and remove the four screws at the rear of thechassis that secure the power supply assembly.4. Remove the old power supply assembly from the chassis.5. Ensure that the power supply assembly is the correct replacement. Somepower supply assemblies automatically sense the voltage, some power supplyassemblies are voltage specific, and some power supply assemblies have avoltage-selection switch. If your computer has a voltage-selection switch,ensure that you set the voltage-selection switch of the new power supplyassembly to match the voltage available at your electrical outlet. If necessary,use a ballpoint pen to slide the voltage-selection switch to a different position.v If the voltage supply range in your local country or region is 100–127 V AC,set the switch to 115 V.v If the voltage supply range in your local country or region is 200–240 V AC,set the switch to 230 V.6. Install the new power supply assembly into the chassis so that the screw holesin the power supply assembly align with those in the chassis.7. Install the four screws to secure the power supply assembly.Note: Use only screws provided by Lenovo.8. Reconnect the power supply assembly connectors to the system board.9. Reconnect a power supply assembly connector to each of the drives.10. Go to “Completing the FRU replacement” on page 120.Figure 14. Removing the retaining screws for the power supply assemblyChapter 8. Replacing FRUs - Tamdhu computers 97
