IBM 8270, Инструкция по установке и обслуживанию

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Step 2. You should also have available any documentation associated with the
UFCs that are installed in the 8270.
Step 3. If you have set up a console session (see Chapter 3, “Setting up a
Console Session” on page 3-1), you can use it to determine whether
diagnostics have been completed correctly. A list of normal diagnostic
messages can be found in
Planning, Configuration, and Operation.
Step 4. Observe the LEDs and the 4-character display on the 8270 front panel.
Ignore the UFC LEDs at this time. Figure 1-5 on page 1-5 and
Figure 1-6 on page 1-6 illustrate the location of these indicators. For
explanations of the LEDs, see Table 1-1 on page 1-5 and Table 1-2 on
page 1-7. For explanations of the messages in the 4-character display,
see “Status Display” on page 1-7. Review these sections before
proceeding with the troubleshooting process.
Step 5. If the 4-character display message indicates a fan (Fx) or fuse (!x) failure,
(8270-800 only), see “Obtaining Service” on page 5-6.
Attention: (8270-800 Only)–fuses 3 and 4 control power to the
Token-Ring Processor Card. If either fuse 3 or fuse 4 fails, the
Token-Ring Processor Card becomes inoperative and cannot display and
status messages. The symptom of failure of fuse 3 or 4 is that the Power
(|) LED on the Token-Ring Processor Card is not on, while the AC OK
and DC OK LEDs on the power supply are on.
Step 6. Otherwise, in Table 5-1 on page 5-3, locate the symptom that best
describes the communication problem and the LED pattern you observed.
Then, go to the section that contains the recommended actions for
resolving the problem and follow that procedure.
Choosing a Troubleshooting Procedure
Use Table 5-1 on page 5-3 to determine which troubleshooting procedure you
should use. Unless otherwise stated, references to the OK and Fault LEDs are
those on the Token-Ring Processor Card.
5-2
8270 Nways LAN Switch Models 600 and 800