Lenovo ThinkStation 2551 Hardware Maintenance Manual page 160

5. Disconnect the cover presence switch cable from the cover presence switch connector on the system
board. See "Locating parts on the system board" on page 84.
6. Remove the screw that secures the cover presence switch and remove the cover presence switch
from the chassis.
Figure 91. Removing the cover presence switch
7. Position the new cover presence switch so that the screw hole in the cover presence switch is aligned
with the corresponding hole in the chassis.
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ThinkStation Hardware Maintenance Manual