Lenovo 4480A5U User Manual page 58

6. Pivot the optical drive upward and disconnect the power supply assembly cables from all drives and
from power connectors 1 and 2 on the system board.
Figure 22. Power connectors on the system board
Note: You might also need to release the power supply assembly cables from some cable clips or ties
that secure the cables to the chassis. Make sure that you note the cable routing before disconnecting
the cables.
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ThinkCentre User Guide