IBM System Storage DS5020 Installation, User's, And Maintenance Manual page 174

Attention:
overheating, replace a failed power supply and fan unit CRU within 15 minutes of
removal. If replacing it will take longer than 15 minutes, stop all I/O activity to the
storage subsystem and turn off the power until you complete the replacement.
Statement 8:
CAUTION:
Never remove the cover on a power supply and fan unit or any part that has
the following label attached.
Hazardous voltage, current, and energy levels are present inside any
component that has this label attached. There are no serviceable parts inside
these components. If you suspect a problem with one of these parts, contact
a service technician.
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IBM System Storage DS5020 Storage Subsystem: Installation, User's, and Maintenance Guide
Potential damage to a component - To prevent damage from
1. If needed, use the DS Storage Manager client software to print a storage
system profile.
2. Did the Recovery Guru direct you to replace a failed power supply and fan
unit?
v Yes - Go to step 3.
v No - Run the Recovery Guru to identify the failed component, and then go
to step 3.
3. Put on anti-static protection.
4. Unpack the new power supply and fan unit. Save all packing material in case
you need to return the failed power supply and fan unit CRU.
Note: The new power supply and fan unit CRU comes with an instruction
sheet and label sheet. The instruction sheet provides instructions on
placing the applicable labels on the power supply and fan unit CRU to
mark the LEDs correctly. The label sheet contains the peel-off labels
that you actually place on the power supply and fan unit CRU.
5. Using the information provided on the instruction sheet, place the labels on the
power supply and fan unit CRU to correctly mark the LEDs.
6. Turn off the power switch on the new unit.
7. Check the Fault LED to locate the failed power supply and fan unit. If a fault is
detected, the amber Fault LED is on.
8. Verify that the Service Action Allowed LED is on. Do not remove the power
supply and fan unit if the LED is off. For more information about the Service
Action Allowed LED, see "Service Action Allowed Status LED" on page 123.
Statement 1: