81
Figure 59 LEDs on a DC power supply
(1) Input status LED (2) Output status LED (3) Over-temperature alarm LED (4) Fault LED
Table 28 Power supply LED description
LED Status Description
Input status LED
Steady on The power is input properly.
Off No power is input.
Flashing The input power exceeds the threshold.
Output status LED
Steady on The power is output properly.
Off No power is output.
Flashing The power output is overloaded.
Over-temperature alarm LED
Steady on An over-temperature alarm has occurred.
Off The power supply is operating properly.
Fault LED
Steady on The power supply is faulty.
Off The power supply is operating properly.
When the input/output LEDs are off or the fault LEDs are on, the power supply does not operate properly.
To troubleshoot the power supply system:
1. Check the power cable connections. If a power cable is loose, re-plug the power cable.
2. Replace the power cable, and check whether the LEDs are normal.
3. Check the power supply installation. If the power supply is not fully seated, re-install the power
supply to make sure it makes close contact with the backplane of the switch.
4. Check the power source. Make sure the power source operates properly and provides a normal
voltage.
5. Check whether the power supply has encountered output short circuit, output over-current, output
over-voltage, input under-voltage, or over-temperature problems.
6. Plug the power supply into an empty power supply slot, and verify that the power supply can
operate properly. If the power supply can operate properly, the power supply slot may have failed.
Otherwise, proceed with the next step.
7. Plug a new power supply that can operate properly into the same power supply slot, and connect
it to the same power source. If the new power supply can operate properly, the old power supply
fails. Contact the agents to replace the old power supply.
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