IBM 220, Hardware Maintenance Manual

Page: 19 / 178

© Copyright IBM Corp. 2000
11
Diagnostics
Diagnostic tools overview . . . . . . . . . . . . . . . . . . . . 11
POST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
POST beep codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
POST error messages . . . . . . . . . . . . . . . . . . . . . . . . 12
POST error log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Small computer system interface messages . . . . . 12
Diagnostic programs and error messages . . . . . . . 13
Text messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Starting the diagnostic programs . . . . . . . . . . . . . . 14
Viewing the test log. . . . . . . . . . . . . . . . . . . . . . . . . . 15
Diagnostic error messages . . . . . . . . . . . . . . . . . . . . 15 Power checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Recovering BIOS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Identifying problems using status LEDs. . . . . . . . 17
Front panel and system board LEDs . . . . . . . . . . . 18
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Replacing the battery . . . . . . . . . . . . . . . . . . . . . . . . 19
Temperature checkout . . . . . . . . . . . . . . . . . . . . . . . 20
Diagnosing errors . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Troubleshooting the Ethernet controller . . . . . . . . 21
Ethernet controller messages . . . . . . . . . . . . . . . . . 23
This section provides basic troubleshooting information to help you resolve some
common problems that might occur with the server.
If you cannot locate and correct the problem using the information in this section,
refer to “Symptom-to-FRU index” on page 111 for more information.
Diagnostic tools overview
The following tools are available to help you identify and resolve hardware-related
problems:
• POST beep codes, error messages, and error logs
The power-on self-test (POST) generates beep codes and messages to indicate
successful test completion or the detection of a problem. See “POST” for more
information.
•
Diagnostic programs and error messages
The server diagnostic programs are stored in upgradable read-only memory
(ROM) on the system board. These programs are the primary method of testing
the major components of the server. See “Diagnostic programs and error
messages” on page 13 for more information.
• Error symptoms
These charts list problem symptoms, along with suggested steps to correct the
problems. See “Diagnosing errors” on page 21 for more information.
• Diagnostic LEDs
The server has light-emitting diodes (LEDs) to help you identify problems with
server components. These LEDs are part of the diagnostics that are built into the
server. See “Diagnostic LEDs” on page 18 for more information.
POST
When you turn on the server, it performs a series of tests to check the operation of
server components and some of the options installed in the server. This series of tests
is called the power-on self-test or POST.
If POST finishes without detecting any problems, a single beep sounds and the first
screen of the operating system or application program appears.