Installation Manual
Quidway S8500 Series Routing Switches Chapter 6 Switch Monitoring and Maintenance
Huawei Technologies Proprietary
6-2
LED Description
OUTPUT
It keeps ON if the power output is normal and OFF in any other
cases.
FAIL It keeps ON if the PSU has failed and OFF in any other cases.
Following are the PSU faults that likely appear and the methods used for problem
isolation.
z
The Input LED (green) and Output LED (green) stay ON, but the display power
command shows that the PSU is not in position (but the other PSU operates
normally). Such a problem is likely caused because of the poor contact between
the PSU and the backplane due to a badly seated PSU. In this case, switch off the
power supply, loosen the captive screws on the PSU, push the PSU into the
chassis a little bit, tighten the captive screws, and switch on the power supply to
check that the normal state is resumed.
z
The Input LED (green) and Output LED (green) are OFF. In this case, check that
the power cords are connected correctly, the power cords are in good condition,
and the power switch has been put in the ON position.
z
The Fail LED (red) is ON. In this case, check that the correct power voltage is in
use (i.e., 90 to 264VAC, 50-60 Hz for AC PSU, and -36V to -72VDC for DC PSU).
z
The Fail LED (red) is ON. In this case, check that the air filter protecting the fan
tray is clean. Excessive dust accumulated on the air filter will block the fan tray
from free ventilation and even lead to power supply failure.
z
If you cannot solve the problem yet after going through the above checking steps,
contact Huawei technical support engineers rather than disassembling the PSU
yourself.
6.1.3 Troubleshooting Fan Tray
The S8500 series provide two LEDs on the fan tray. You can read them and know if the
fan tray is OK.
Table 6-2 Description of fan tray LEDs
Indicator State description
RUN
Green indicates that the fan tray is normally operating.
OFF indicates that the fan tray has failed.
ALM
Red indicates that the fan tray has failed.
OFF indicates that the fan tray is in normal state.
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