Installing Or Replacing A Power Supply - IBM J15 Manual

9. If needed, reconnect the power cables to the expansion enclosure, as described in "Powering on the
5U92 disk enclosure" on page 42.
10. Check the LEDs on the top of the secondary expander module to verify that it is receiving power.
"5U92 disk enclosure LEDs and indicators" on page 45 describes the status indicated by the LEDs.

Installing or replacing a power supply

Use the following procedures to replace either of the redundant power supplies in the 5U expansion
enclosure. The redundant power supplies operate in parallel; one continues to provide power to the
enclosure if the other fails.
Before you begin
Important: You can replace a PSU without powering off the expansion enclosure. However, to maintain
operating temperature, replace the PSU within 10 minutes of its removal. When a PSU is removed, the
reduction in airflow through the enclosure might cause the enclosure or its components to shut down to
protect from overheating.
About this task
This task assumes that the following conditions are met:
• You removed the PSU, following the procedure described in "Removing a power supply " on page 93.
• You removed the fascia that covers the PSU from the front of the expansion enclosure, as described in
"Removing the fascia " on page 91.
• You are aware of the procedures for handling static-sensitive devices.
Procedure
1. Read all safety information.
2. Rotate the handles on the PSU outward, as shown in Figure 56 on page 58.
Chapter 3. Maintaining the system hardware 57