c. When the procedure is completed, rerun the Recovery Guru to make sure
that the problem has been corrected by selecting Recheck in the Recovery
Guru.
11. If the problem persists, contact IBM Customer andTechnical Support.
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.
The power supply and fan unit is a component that includes both a 600-W power
supply unit and two fans. The power supply and fan units provide power and
cooling for the DS5020. The power supply and fan units are customer replaceable
units (CRUs) and do not require preventive maintenance. Use only the supported
power supply and fan units for your specific storage subsystem.
Each power supply and fan unit has a built-in sensor that detects the following
conditions:
vOver-voltage
vOver-current
vOverheated power supply
If any of these conditions occurs, one or both power supplies will shut down. If the
power remains off after the condition that causes it to go off, make sure that the
environment is optimal (no overheating has occurred, all electrical outlets are
working, and so on). For more information, see “Restoring power after an
unexpected shutdown” on page 112.
The storage subsystem cooling system consists of two fans in each of the two
power supply and fan unit CRUs. The power supply and fan units circulate air from
the front to the back of the unit.
If both power supply and fan units fail, or if the power supply and fan units cannot
maintain an internal temperature below 68° C (154° F), the power supply and fan
Chapter5. Replacing components 139