3com 3C17502 User Manual

C

HAPTER

 6: T

ROUBLESHOOTING

The following list describes potential problems with the power supply and their 
solutions.

■

The INPUT LED and OUTPUT LED are on, but the 

 command 

shows that the power supply is not in position. The other power supply is 
operating normally. 

This problem may be caused by poor contact between the power supply and 
the backplane if the power supply is badly seated. To resolve this, do the 
following:

■

Switch off the power supply.

■

Loosen the captive screws on the power supply.

■

Push the power supply into the chassis.

■

Tighten the captive screws.

■

Switch on the power supply and verify that it is operating normally.

■

 The INPUT LED and OUTPUT LED are off. 

Verify the following:

■

Power cords are connected correctly

■

Power cords are in good condition

■

The power switch is in the ON position.

■

The power supply is installed right side up.

■

 The FAIL LED is on. 

Verify the following:

■

The correct power voltage is in use: 90 to 264 V AC, 50 to 60 Hz.

■

The air filter protecting the fan frame is clean. If dust has accumulated on 
the air filter will block the fan frame from free ventilation and even lead to 
power supply failure.

If you cannot resolve an issue with the power supply after using these procedures, 
contact your 3Com Service Representative. Do not attempt to repair the power 
supply yourself.

If the fan OK LED is off, check that: 

■

The fan assembly has been installed in the correct position for normal 
communication with the backplane and the cables are in good condition.

■

Every fan is working normally.

OUTPUT

On — The power output is normal.

 

Off — The power output has failed.

FAIL

On — The power supply has failed.

 

Off — The power supply is operating.

Table 32   Power LEDs on the Power Supply (continued)