Troubleshooting The Power Supply - Cisco Catalyst 4900M Installation Manual

Chapter 4 Troubleshooting the Installation
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Troubleshooting the Power Supply

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The port LEDs (1-48) are green when the module is operational (online). If
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no signal is detected, the LINK LED is off. The port LED remains yellow if
the port is disabled. The port LED flashes yellow if the port tested faulty at
startup.
If a STATUS LED is red, contact a customer service representative for
instructions.
If the boot information and system banner are not displayed, verify that the
terminal is set correctly and that it is connected properly to the console port.
Follow these steps to help isolate a power subsystem problem:
Verify that the power supply is plugged in and that the on/off switch is set to ON
(if the power supply is an AC supply).
Look at the power supply LED (PS1 or PS2). If the LED is off or if the LED is
red, unplug the power cord, and then plug the power cord in. Be sure the on/off
switch is OFF before removing the power cord from the power supply.
If the LED remains off, there might be a problem with the AC or DC source or the
power cable.
Connect the power cord to another power source if one is available.
If the LED then lights, the problem is the first power source.
If the LED fails to light after you connect the power supply to a new power source,
replace the power cord.
If the LED still fails to light when the switch is connected to a different power
source with a new power cord, the power supply is probably faulty.
If you are unable to resolve the problem, contact a customer service representative
for instructions.
Troubleshooting the Power Supply
Cisco Catalyst 4900M Switch Installation Guide
4-5