Sun Microsystems 5500, Reference Manual

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Chapter 9 Troubleshooting Overview 9-7
9.2.6.2 Power/Cooling Modules (PCMs)
For a PCM at the front of the card cage, the green LED is to the left of the yellow
LED. At the back of the card cage, the LED positions are reversed and the green LED
is to the right of the yellow LED. See
TABLE 9-3
.
When the yellow LED is lit, a fan or a DC output has malfunctioned. Each modular
power supply contains two fans and three DC supplies (+3.3 VDC, +5 VDC, and +2
VDC).
The green LED indicates that the DC supplies are operating, but does not guarantee
that the DC outputs are within specification.
The PCMs operate in redundant current share mode. If a module fails, the remaining
modules may or may not provide enough current to continue system operation. The
system’s ability to continue operations depends on the total demand for current.
9.2.7 Disk Tray Indicators
The availability and type of status information varies with the disk tray type used in
a system. Refer to the disk tray user manual for specific status information.
TABLE 9-3
Modular Power Supply LED Codes
Green Yellow Condition
Off Off No AC input or key switch is turned off.
On Off Normal operation.
On On A fan has failed or one or more voltages are out of specification.
Off On One or more DC outputs have failed, or the voltages are out of
specification, or the system is in the low power state.