Lenovo ThinkCentre A55 Hardware Maintenance Manual - Page 114
the system board illustration for your machine type at Identifying parts
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14. Install the heat sink and fan assembly on the system board. 15. Connect the heat sink and fan assembly cable to the system board. See the system board illustration for your machine type at "Identifying parts on the system board" on page 89. 16. Position the fan duct on the heat sink fan. 17. Go to "Completing the FRU replacement" on page 124. Types 8013, 8716, 8976, 8986, 9266, 9282, 9374, 9384, and 9647 Important The heat sink and microprocessor might be very hot. Make sure these components are cool enough to safely handle before continuing this procedure. 1. Remove the cover. See "Removing the cover" on page 87. 2. Lift the fan duct off the heat sink fan. 3. Disconnect the heat sink and fan assembly cable from the system board. See the system board illustration for your machine type at "Identifying parts on the system board" on page 89. 4. Rotate handle 1 to release the heat sink clamp and then disengage the clamp from the plastic retention bracket. 108 Hardware Maintenance Manual