IBM System Storage Subsystem DS5020 - Manual (Page 73)

Replacing an ac power supply and fan unit
Statement 5:
CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current
from the device, ensure that all power cords are disconnected from the power
source.
1
2
CAUTION:
Disconnect the power cord before replacing the power supply and fan unit.
Complete the following steps to replace the power supply and fan units that you
removed before the installation:
1. Slide one power supply and fan unit into the storage subsystem. Be sure to
replace the power supply and fan units so that the lever on each power supply
and fan unit opens toward the interior of the storage subsystem, as shown in
Figure 22. Do not force fit. The power supply and fan unit is designed to prevent
it from being inserted into the chassis incorrectly.
Attention: Be sure that the lever is pulled straight out as you slide the power
supply and fan unit into the storage subsystem, as shown in Figure 22. The left
and right power supply and fan units are seated in the DS5020 chassis in
opposite orientations. If you cannot fully insert the power supply and fan unit
into the power supply and fan unit bay, flip it 180° and reinsert it.
2. As you slide the power supply and fan unit into the empty slot, make sure the
guide pins on the side of the power supply and fan unit fit into the notches
Lever
Latch
Figure 22. Replacing a power supply and fan unit
Chapter 2. Installing the storage subsystem 43