Table 3-2 describes the power supply LED codes on the back panel.

￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿'#￿￿￿￿￿￿￿￿￿￿￿￿￿(￿￿￿￿

-$￿

￿￿￿￿￿

7￿￿￿￿￿￿￿￿

 

 

 

DC

Green

On — DC power is good.

 

 

Off — DC output power is not good.

 

 

If the DC green LED is off, contact a service

 

 

technician to replace the power supply.

If one power supply fails, the message, Power supply degraded . . . appears on the LCD. A similar message appears on the system console telling you which power supply failed. The message, Power good, also appears on the LCD and console, indicating that the second power supply is maintaining the filer.

AC

Yellow

On—AC signal is good.

Off—AC signal is not good.

If the AC LED is off but the power LED on the front panel is on, the second power supply takes over and maintains the filer. In either case:

￿

￿

￿

￿

Ensure that the power supply is fully installed and locked into place.

Ensure that the power switch is in the On position.

Check the power source.

If the preceding actions do not correct the problem, contact Dell technical support for help.

3-4 Dell PowerVault 720N, 740N, and 760N Installation and Troubleshooting Guide

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Dell 760N, 720N, 740N manual Off-AC signal is not good