Lenovo ThinkCentre A70 Hardware Maintenance Manual for ThinkCentre A70 - Page 87

Replacing the heat sink and fan assembly, Use only screws provided by Lenovo.

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Figure 18. Removing the power supply assembly 6. Make sure that the new power supply assembly is the correct replacement. Some power supply assemblies automatically sense the voltage or accept universal input, some power supply assemblies are voltage specific, and some power supply assemblies have a voltage-selection switch. If your power supply assembly has a voltage-selection switch, make sure 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 the correct position. • If the voltage supply range in your local country or region is 100-127 V ac, set the voltage-selection switch to 115 V. • If the voltage supply range in your local country or region is 200-240 V ac, set the voltage-selection switch to 230 V. 7. Install the new power supply assembly into the chassis so that the screw holes in the new power supply assembly are aligned with the corresponding holes in the rear of the chassis. 8. Install the four screws to secure the new power supply assembly in place. Note: Use only screws provided by Lenovo. 9. Connect the new power supply assembly cables to all drives and the system board. See "Locating parts on the system board" on page 69. 10. To complete the replacement, go to "Completing the parts replacement" on page 94. 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 of the ThinkCentre Safety and Warranty Guide, go to: http://www.lenovo.com/support This section provides instructions on how to replace the heat sink and fan assembly. Chapter 8. Replacing FRUs (Machine Types: 0864, 7099, and 7846.) 81

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Figure 18. Removing the power supply assembly
6. Make sure that the new power supply assembly is the correct replacement. Some power supply
assemblies automatically sense the voltage or accept universal input, some power supply assemblies
are voltage specific, and some power supply assemblies have a voltage-selection switch. If your power
supply assembly has a voltage-selection switch, make sure 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 the correct position.
•
If the voltage supply range in your local country or region is 100–127 V ac, set the voltage-selection
switch to 115 V.
•
If the voltage supply range in your local country or region is 200–240 V ac, set the voltage-selection
switch to 230 V.
7. Install the new power supply assembly into the chassis so that the screw holes in the new power supply
assembly are aligned with the corresponding holes in the rear of the chassis.
8. Install the four screws to secure the new power supply assembly in place.
Note:
Use only screws provided by Lenovo.
9. Connect the new power supply assembly cables to all drives and the system board. See “Locating
parts on the system board” on page 69.
10. To complete the replacement, go to “Completing the parts replacement” on page 94.
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 of the
ThinkCentre
Safety and Warranty Guide
, go to:
This section provides instructions on how to replace the heat sink and fan assembly.
Chapter 8
.
Replacing FRUs (Machine Types: 0864, 7099, and 7846.)
81