IBM 8646 Hardware Maintenance Manual - Page 19

Diagnostics, Diagnostic tools overview, POST, POST beep codes

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Diagnostics 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 91 for more information. Diagnostic tools overview The following tools are available to help you identify and resolve hardware-related problems: v 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. v 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 12 for more information. v 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 17 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. If POST detects a problem, more than one beep sounds and an error message appears on the screen. See "POST beep codes" and "POST error messages" on page 12 for more information. Notes: 1. If you have a power-on password set, you must type the password and press Enter, when prompted, before POST will continue. 2. A single problem might cause several error messages. When this occurs, work to correct the cause of the first error message. After you correct the cause of the first error message, the other error messages usually will not occur the next time you run the test. POST beep codes Beep codes are sounded in a series of beeps. For example, a 1-2-4 beep code sounds like one beep, a pause, two consecutive beeps, another pause, and four more consecutive beeps. © Copyright IBM Corp. 2001 11

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Diagnostics
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 91 for more information.
Diagnostic tools overview
The following tools are available to help you identify and resolve hardware-related
problems:
v
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.
v
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 12 for more information.
v
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 17 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.
If POST detects a problem, more than one beep sounds and an error message
appears on the screen. See
“
POST beep codes
”
and
“
POST error messages
”
on
page 12 for more information.
Notes:
1.
If you have a power-on password set, you must type the password and press
Enter, when prompted, before POST will continue.
2.
A single problem might cause several error messages. When this occurs, work
to correct the cause of the first error message. After you correct the cause of the
first error message, the other error messages usually will not occur the next
time you run the test.
POST beep codes
Beep codes are sounded in a series of beeps. For example, a 1-2-4 beep code
sounds like one beep, a pause, two consecutive beeps, another pause, and four
more consecutive beeps.
© Copyright IBM Corp. 2001
11