Fujitsu N800 manual Replacing a power supply unit, Description, V Caution

System expansions			Power supply units
LED	LED	LED	Description
green	yellow	yellow
(1)	(2)	(3)
OFF	OFF	OFF	No AC power.
blinking	OFF	OFF	No AC power; standby outputs on.
ON	OFF	OFF	DC outputs on. Power supply unit okay.
OFF	ON	OFF	Power supply unit failure.
ON	blinking/	OFF	Current limit.
	none
	latch
ON	OFF	blinking/	„Predictive Failure“: The power supply unit
		latched	is about to fail in the near future because
			the fan is performing poorly. The power
			supply unit should be exchanged as soon
			as possible.

Table 25: Power supply unit status monitoring

8.3.1Replacing a power supply unit

If a power supply unit fails the yellow power supply failure LED on the front panel turns on. The defective power supply unit can be replaced without turning the server power off.

VCAUTION!

Because of chassis airflow disruption, the power supply unit bay should not be vacant and/or not covered for more than five minutes when server power is on. Exceeding the five-minute limit may cause damage to certain drives.

ÊLook at the yellow LED (2) on the back side of the server (see figure 22 on page 94) to determine which power supply unit is defective.

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