7

7.4.3 Troubleshooting a PCM

A green LED is lit on the power supply when it is operational. When a PCM fails, a yellow LED is lit on the power supply.

You will see a message similar to the following example on your system console when a PCM fails:

WARNING: Core Power Supply 2 Failing

WARNING: Redundant power lost

See Chapter 10, “Flow Diagrams for Troubleshooting,” for more information.

7.4.4 Replacing a PCM

Caution – Remove and replace the PCM in a running system. Do not replace a PCM while the system is in the low power mode. In the low power mode, the

! front panel and board LEDs are all off while the yellow LEDs are lit on the power supplies.

!

Replacing a PCM during low power mode will cause the system to power up immediately and result in a severe overload condition for that PCM (the other PCMs will remain in the low power mode).

Caution – Replace the PCM within several minutes or risk overheating the board(s) cooled by the fans in that power supply.

Note – Remember the following rules when attempting the hot-plug replacement of a PCM:

The peripheral power supply is providing precharge.

There is (power) redundancy in the system.

Use the printdiag (1M) command to determine if precharge current is present.

When replacing a PCM, be sure that the extraction lever is on the outside edge of the system. See Figure 7-6.

Power Supplies

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Sun Microsystems 6000, 4000, 5000 manual Troubleshooting a PCM, Replacing a PCM

4000, 5000, 6000 specifications

Sun Microsystems, a pivotal player in the computing industry during the late 20th and early 21st centuries, was renowned for its innovative hardware and software solutions. Among its notable offerings were the Sun-6000, Sun-5000, and Sun-4000 series, powerful workstations and servers designed for a range of enterprise-level applications.

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In summary, the Sun-6000, 5000, and 4000 series exemplified Sun Microsystems' ethos of innovation and reliability. These powerful systems catered to diverse business needs, setting benchmarks in performance and functionality that continue to influence modern computing.