Lenovo ThinkCentre M90p Hardware Maintenance Manual - Page 83
Replacing the heat sink and fan assembly
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3. Disconnect the power supply assembly cables from the system board and all drives. See "Locating parts on the system board" on page 70. 4. Release the power supply assembly cables from the cable clips and ties in the chassis. 5. Lay the computer on its side and remove the four screws at the rear of the chassis that secure the power supply assembly. Figure 10. Removing the screws for the power supply assembly 6. Slide the power supply assembly to the front of the computer and then lift it out of the chassis. 7. Ensure that the new power supply assembly is the correct replacement. If your new power supply assembly has a voltage-selection switch, ensure that you set the voltage-selection switch 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. • If the voltage supply range in your local country or region is 100-127 V ac, set the switch to 115 V. • If the voltage supply range in your local country or region is 200-240 V ac, set the switch to 230 V. 8. 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. 9. Install and tighten the four screws to secure the power supply assembly. Note: Use only screws provided by Lenovo. 10. Reconnect the power supply assembly cables to the system board and each of the drives. 11. Secure the power supply assembly cables with the cable clips and ties in the chassis. 12. Go to "Completing the parts replacement" on page 98. Replacing the heat sink and fan assembly Attention Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy Chapter 8. Replacing FRUs (Machine Types: 3029, 3054, 3139, 3219, 3246, 3282, 3349, 3421, 3544, 3652, 3769, 3934, 4992, 5206, 5267, 5325, 5384, 5450, 5474, 5498, 5554, 5852, 6232, and 6590.) 75