Chapter 4 Troubleshooting the Installation
Problem Solving to the System Component Level
4-2
Cisco Catalyst 4900M Switch Installation Guide
78-18350-01
• System software boots successfully.
If all of these conditions are met and the hardware installation is complete, refer
to the software configuration guide and the command reference publications to
troubleshoot the software. However, if any of these conditions are not met, use the
procedures in this chapter to isolate and, if possible, resolve the problem.
Problem Solving to 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.
The switch consists of the following subsystems:
• Power supply—Includes the power supply and power supply cooling. (See
the
“Troubleshooting the Power Supply” section on page 4-5.)
• Fan assembly system—The chassis fan assembly should operate whenever
system power is on. Usually, it continues to operate even when the
environmental monitor shuts down the system because of an overtemperature
or overvoltage condition. (It will shut down for a power supply shutdown.)
You should be able to hear the fan assembly to determine whether or not it is
operating. If the FAN LED is orange and you determine that the fan assembly
is not operating, you should immediately contact a customer service
representative. There are no installation adjustments that you can make if the
fan assembly does not function properly at the initial startup.
Identifying Startup Problems
When you connect the power cords to the Catalyst 4900M switch, follow these
steps:
Step 1 Flip the power switches to the on position (AC powered systems only).
Step 2 Verify that power is available to the power supplied from the site AC or DC
source. Flip breakers and fuses if necessary.
