IBM DS3500 Installation, User's, And Maintenance Manual page 144

Attention: To prevent damage to the storage subsystem components from overheating, replace a failed
power supply within 10 minutes of removal. If replacing it will take longer than 10 minutes, stop all I/O
activity to the storage subsystem and turn off the power until you complete the replacement. Do not
remove the failed power supply from the storage enclosure until you:
v Review the replacement procedure in this section.
v Have the replacement power supply and are ready to install it in the enclosure.
(L001)
1. If necessary, use the Storage Manager software to print a storage system profile.
2. Read the safety information that begins on page "Safety" on page xi and "Best practices guidelines"
on page 1-7.
3. Did the Recovery Guru direct you to replace a failed power supply?
v Yes: Go to step 4.
v No: Run the Recovery Guru to identify the failed component, and then go to step 4.
4. Unpack the new dc power supply. Save all packing material in case you have to return the failed
power supply.
5. Turn off the power switch on the new unit.
6. Check the fault LED to locate the failed power supply. If a fault is detected, the amber fault LED is
lit.
7. Make sure that the OK to remove LED is lit. Do not remove the power supply if the LED is off. For
more information about the OK to remove LED, see "OK to remove LED" on page 5-1.
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System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide