Cisco Catalyst 6840 Series Troubleshooting Manual

Troubleshooting
Problems with the initial startup are often caused by a switching module that has become dislodged from the
backplane or a power supply that has been disconnected from the power cord connector. Although temperature
conditions above the maximum acceptable level rarely occur at initial startup, you might encounter these
conditions during extended operation. Long-term monitoring functions also include independent reporting of
DC-output voltage problems.
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Getting Started

When the initial system startup is complete, verify the following:
• Power supplies are supplying power to the system.
• The fan tray assembly is operating.
• System software boots successfully.
If one or more of the above conditions are not met, use the procedures described in this chapter to isolate and,
if possible, resolve the problem. If all of the above conditions are met, and the hardware installation is complete,
refer to your software release notes for hardware support information and software caveats.

Solving Problems at the System Component Level

The key to success when troubleshooting the system is to isolate the problem to a specific system component.
The first step is to compare what the system is doing to what it should be doing. Because a startup problem
can usually be attributed to a single component, it is more efficient to isolate the problem to a subsystem rather
than troubleshoot each separate component in the system.
Getting Started, on page 1
Solving Problems at the System Component Level, on page 1
Identifying Startup Problems, on page 2
Troubleshooting the Power Supply, on page 2
Troubleshooting the Fan Tray , on page 3
Status LED Indicators, on page 4
Contacting Cisco Customer Service, on page 4
Finding the Serial Number, on page 5
Troubleshooting
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