Lenovo 5023 - Manual (Page 39)

4. Pivot the drive bay assembly upward, remove the four screws that secure the
heat sink fan duct, and then lift the heat sink fan duct up to remove it from
the chassis.
5. Disconnect the power supply assembly cables from all drives and from the
24-pin power connector and 4-pin power connector on the system board. See
“Locating parts on the system board” on page 11.
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.
Figure 23. Removing the heat sink fan duct
Chapter 2. Installing or replacing hardware 31