IBM System Storage Subsystem DS5020 - Manual (Page 180)

a. Squeeze the latch and pull the lever open 90° (so that the lever is
horizontal) to release the power supply and fan unit from the latch. The
latch is a coral colored tab on the lever.
b. Slowly pull the lever away from the chassis to remove the power supply
and fan unit, as shown in Figure 17 on page 39. (Remove the power
supply and fan unit from the chassis and place it on ESD protected
surface.)
Note: The lever rotates upward or downward 90°, depending on whether
the power supply and fan unit you are removing is in the right or left
power supply and fan unit bay.
c. Repeat steps 6a and 6b for the other power supply and fan unit.
7. Label the Enhanced Disk Drive Module (E-DDM) CRUs so you know their
physical location in the midplane.
8. Remove the E-DDM CRUs and any blank drive CRUs if the storage subsystem
has them. See “Removing an E-DDM” on page 39 for instructions. Place
E-DDMs on ESD protected surface.
Attention: Do not stack E-DDM CRUs on top of each other. Protect the
E-DDM CRUs from vibrations or sudden shocks.
9. Use a #1 Phillips screwdriver to loosen the four front cage frame screws on
the midplane, as shown in Figure 86.
10. On the back of the DS5020, remove the four Phillips screws (two screws on
each side) that hold the sides of the DS5020 chassis to the sides of the rails.
11. On the front of the DS5020, remove the four M5 screws (two screws on each
side) on the DS5020 chassis that hold the DS5020 to the rails.
Attention: The unit must be removed from the rack and placed on a level
ESD protected surface before servicing it.
12.
Statement 4:
810midpl
Front cage frame screws
Front cage frame screws
Figure 86. Front cage frame screw locations
150 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide