Choosing A Troubleshooting Procedure - IBM 8275-416 User Manual

Choosing a Troubleshooting Procedure

Use Table 14 to determine which troubleshooting procedure you should use. Unless
otherwise stated, references to the OK and Fault LEDs are those on the switch.
Table 14. Troubleshooting Symptoms and Actions
Symtom and LED State
The Fault LED and the OK LED are Off, and the fan
is not running
The Fault LED is blinking.
The Fault LED is On and there is a "1" in the
single-digit display.
The Fault LED is On and there is a character other
than a "1" displayed in the single-digit display.
None of the devices connected to the switch can
communicate, the Fault LED is Off and the Power (I)
LED is On.
A single device connected to the switch is having
trouble communicating.
A feature module Fault LED is On.
Note: The term segment refers to a single cable or interconnected cables between
Procedure A
Use this procedure if all LEDs are Off:
1. Verify that the ac power outlet to which the switch power supply is connected is
2. Verify that the power cord is installed correctly.
3. If the preceding conditions are satisfied, the power supply is defective. See
Procedure B
Use this procedure if the Fault LED is On, and there is a character other than a "1"
in the single-digit display:
1. Reset the switch by disconnecting the power cord from the outlet, waiting 10
2. One or more faulty feature modules can cause this symptom, and the remaining
3. If the problem is not corrected, the switch is defective. See "Obtaining Service"
90
8275-416 User's Guide
a port and the device at the other end.
active. If an uninterruptible power supply (UPS) is being used to provide ac
power, ensure that the UPS is working correctly.
"Obtaining Service" on page 92.
seconds, and reconnecting the power cord to the outlet. If this corrects the
problem, resume using the switch.
ports might continue to operate.
a. If you have feature modules, remove them.
b. Reset the switch.
c. If the switch comes up, reinstall the feature modules one at a time, and
reset the switch to determine the failing feature module.
on page 92.
Action
Go to "Procedure A"
Diagnostics are still in progress...Wait
Go to "Procedure E" on page 92
Go to "Procedure B"
Go to "Procedure C" on page 91
Go to "Procedure D" on page 91
Remove and replace the feature
module.