User's Manual

4-4
Cisco Catalyst 4900M S witch Inst allati on Guide
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Chapter 4 Troubleshooting the Installation
Troubleshooting the Power Supply
Troubleshooting th e Power Supply
To help isolate a power subsystem probl em, perform the followin g steps:
Step 1 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).
Step 2 Look at the power supply LED (PS1 or PS2). If the LED is off or if the LED is red, unplug the powe r
cord, and then pl ug the powe r cord in. Be sur e the on/ off switc h is OFF before r emoving the power cor d
from the power supply.
Step 3 If the LED remains off, there might be a problem with the AC or DC source or the power cable.
Step 4 Connect the power cord to another power source if one is available.
Step 5 If the LED then lights, the problem is the first power source.
Step 6 If the LED fails to light after you connect the power supply to a new power source, replace the power
cord.
Step 7 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 probab ly faulty.
If you are unable to resolve the problem, contact a customer service representative for instructions.
Contacting Cust omer Service
If you are unable to solve a startup problem after using the troubleshooting suggestions in this chapter,
contact a customer service representative for assistance and further instructions. Before you call, have
the following information r eady to help your service pro vider assist you as quickly a s possible:
• Date you received the switch
• Chassis serial number (located on a label on the right of the rear of the chassis, see Figure 4-1)
• Type of software and release number
• Maintenance agreement or warranty information
• Brief description of the probl em
• Brief explanation of the steps you have already taken to isolate and resolve the proble m