IBM J15, Manual

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Figure 91. Fascia removed from the PSUs
Replace the fascia
4. To reinstall the front or PSU fascia, or replace them with parts from FRU stock, follow the procedure in
“Installing or replacing the fascia” on page 24.
Removing a power supply
You can remove either of the redundant power supply units in a 5U expansion enclosure. Redundant
power supplies operate in parallel; one continues to provide power to the enclosure if the other fails.
Before you begin
Important: You can remove a PSU without powering off the expansion enclosure. However, to maintain
operating temperature, ensure that you perform the following tasks.
• Do not remove a faulty PSU until its replacement is ready to be installed.
• Do not remove a PSU from an operational enclosure for more than approximately 10 minutes. The
reduction in airflow through the enclosure might cause the enclosure or its components to shut down to
protect from overheating.
About this task
Each PSU provides cooling to the lower part of the enclosure. Ensure that the second PSU in the enclosure
is powered on and operating correctly. For example, in Figure 92 on page 94, PSU 1 is operating while
PSU 2 is being removed.
Review and follow the procedures for handling static-sensitive devices before you remove the power
supply unit (PSU).
Procedure
1. Read all safety information.
Chapter 3. Maintaining the system hardware 93