Identifying Startup Problems; Troubleshooting The Power Supply - Cisco Catalyst 6840 Series Hardware Installation Manual

Identifying Startup Problems

The switch consists of these subsystems:
• Power supplies
• Fan tray assembly

Identifying Startup Problems

LEDs indicate all system states in the startup sequence. By checking the LEDs, you can determine when and
where the system failed in the startup sequence.
Procedure
Step 1 Turn on the power supplies. You should immediately hear the system fan tray assembly begin to operate.
• If you determine that the power supplies are functioning normally and that the fan tray assembly is faulty,
Step 2
If the startup information and system banner do not display at startup, verify that the terminal is set correctly
and that it is connected properly to the console port.

Troubleshooting the Power Supply

If the OK LED does not light after you turn on the power switch, follow these steps to isolate a power subsystem
problem:
Procedure
Step 1
Verify that the OK LED on the power supply is green.
• If the OK LED is green, the AC or DC source is good and the power supply is functional.
• If the OK LED remains off, there might be a problem with the AC source, the DC source, or the power
• Turn off the power to the switch, connect the power cord to another power source if one is available, and
• If the OK LED is green, the problem is the first power source.
• If the OK LED fails to light after you connect the power supply to a new power source, replace the power
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The chassis fan tray assembly should operate whenever system power is on. You should see the FAN
LED turn green and hear the fan tray assembly operating. A amber FAN LED indicates that one or more
fans in the fan tray assembly is not operating. You should immediately contact a Customer Service
representative if the fan tray assembly is not functioning properly. There are no installation adjustments
that you can make if the fan tray assembly does not function properly at initial startup.
contact a customer service representative.
cable.
turn on the power.
cord, and turn on the switch.
Troubleshooting