3Com 3C16895 - Manual (Page 65)

6
T
ROUBLESHOOTING
This chapter covers the following topics:
■ Troubleshooting the Configuration
■ Troubleshooting Power
■
Troubleshooting the Fan
■
Troubleshooting the Modules
The simplest way to diagnose a fault is to check the system status LEDs on the
Fabric modules. In addition, with the DeviceMgr network management system,
you can also locate the fault through management software.
Troubleshooting the
Configuration After the switch is powered on, booting information is displayed on the
configuration terminal. If the configuration system has failed, there is no screen
display at the configuration terminal or the displayed characters are illegible.
No information is
displayed on the
terminal
If there is no information displayed on the terminal after the Switch 7750 is
powered on, check that:
■ The power system is working normally.
■
The Fabric is working normally.
■
The console cable has been connected to the console port in the Fabric.
If this procedure does not reveal the problem, verify that the console cable is
properly connected and that the configuration terminal is set correctly.
The display characters
are illegible
If the displayed characters are illegible, the parameters of configuration terminal
may not have been set correctly. See Setting Terminal Parameters on page 45.
Troubleshooting
Power If the Power OK LED is off, there may be something wrong with the system power
supply. Check that:
■
The power module has been installed in the correct position to ensure normal
communication with the backplane.
■ The switch power has been turned on.
■
The power cord is connected properly.
■ The source voltage is correct.