Choosing A Troubleshooting Procedure; Procedure A; Procedure B; Troubleshooting- Isolating Problems - IBM 8275 User Manual

Choosing a Troubleshooting Procedure

Use Table 4 to determine which troubleshooting procedure you should use. Unless
otherwise stated, references to the OK and Fault LEDs are those on the 8275-416 .
Table 4. Troubleshooting— Isolating Problems
Symtom and LED State
The Fault LED, the OK LED are off, and the fan is not
running.
The Fault LED is On. If the Fault LED is blinking,
diagnostics are in process.
None of the devices connected to the 8275-416 can
communicate , the Fault LED is Off and the Power (I)
LED is On.
A single device connected to the 8275-416 is having
trouble communicating.
A feature module Fault LED is On.
Note: The term "segment" refers to a single cable or interconnected cables

Procedure A

Use this procedure if all LEDs are Off:
1. Verify that the ac power outlet to which the 8275-416 power supply is connected
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
1. Reset the 8275-416 by disconnecting the power cord from the outlet, waiting 10
2. One or more bad feature modules can cause this symptom, and the remaining
3. If the problem is not corrected, the 8275-416 is defective. See "Obtaining
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8275-416 User's Guide
between a port and the device at the other end.
is 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 65.
seconds, and reconnecting the power cord to the outlet. If this corrects the
problem, resume using the 8275-416 .
ports might continue to operate.
a. If you have feature modules, remove them.
b. Reset the 8275-416 .
c. If the 8275-416 comes up, reinstall the feature modules one at a time, and
reset the 8275-416 to determine the failing feature module.
Service" on page 65.
Action
Go to "Procedure A"
Go to "Procedure B"
Go to "Procedure C" on page 65
Go to "Procedure D" on page 65
Remove and replace the feature
module.