3com 8807 User Manual

C

HAPTER

 6: S

WITCH

 M

ONITORING

 

AND

 M

AINTENANCE

The following PSU faults may appear on the switch. Follow the instructions 
provided to resolve the problem.

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:

1 Switch off the power supply

2 Loosen the screws on the PSU

3 Push the PSU into the chassis a little bit

4 Tighten the screws

5 Switch on the power supply to check that the normal state is resumed

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.

Check that the:

■

Correct power voltage is in use (90 to 264VAC, 50-60 Hz for AC PSU).

■

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

The Switch 8800 Family provides two LEDs on the fan tray as described in 
Table 76.

n 

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.

Table 76   Fan tray LEDs

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.