Lenovo ThinkCentre A55 8705 Hardware Replacement Manual page 20

12
Hardware Replacement Guide
a. Pivot the handle 1 to release the heat sink clamp and then disengage the
clamp from the plastic retention bracket.
b. Remove the four screws 1 securing the heat sink and fan assembly to the
system board.
Note: You might have to gently twist the heat sink to free it from the
microprocessor.
6. Lift the failing heat sink and fan assembly off the system board.