80CHAPTER 6: SWITCH MONITORING AND MAINTENANCE
The following PSU faults may appear on the switch. Follow the instructions provided to resolve the problem.
Display Power Command Indicates the PSU is Not in Position
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). This problem is likely caused by a poor connection (badly seated) between the PSU and the backplane. To correct this:
1Switch off the power supply
2Loosen the screws on the PSU
3Push the PSU into the chassis a little bit
4Tighten the screws
5Switch on the power supply to check that the normal state is resumed
The Input LED (green) and Output LED (green) are OFF
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.
The Fail LED (red) is ON Check that the:
■Correct power voltage is in use (90 to 264VAC,
■Air filter protecting the fan tray is clean. Excessive dust accumulated on the air filter may block the fan tray from free ventilation and can lead to power supply failure.
w If the problem persists, contact 3Com technical support engineers. Do not disassemble the PSU yourself.
Troubleshooting Fan The Switch 8800 Family provides two LEDs on the fan tray as described in Tray Table 76.
Table 76 Fan tray LEDs
Indicator | State description |
|
|
RUN | Green indicates that the fan tray is operating normally. |
| 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 operating normally. |
|
|
n The ALM LED on the fan tray stays ON for two to three seconds when the switch is powered on.
If the RUN LED is OFF, check that:
■The fan tray has been well seated.
■All the cables connecting the fan tray to the backplane are connected and are in good condition.
