IBM 3745 Series, Installation And Maintenance Manual

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Chapter 4. Service Processor Diagnostics and Test
Information
The following tools are available to help identify and resolve hardware-related
problems:
¹
Power-on self-test (POST)
¹
POST Beep Codes
¹
Error Code Format
¹
Diagnostic Test Programs (IBM PC Enhanced Diagnostics)
Power-On Self-Test (POST)
Each time you power-on the system, it performs a series of tests that check the
operation of the system and some options. This series of tests is called the
power-on self-test, or POST. POST does the following:
¹
Checks some basic system-board operations
¹
Checks the memory operation
¹
Starts the video operation
¹
Verifies that the diskette drive is working
¹
Verifies that the hard disk drive is working
If the POST finishes without detecting any problems, a single beep sounds and the
first screen of your operating system or application program appears.
Note
The service processor based on 6563 computer is default to come up quiet (No
beep and no memory count and checkpoint code display) when no errors are
detected by POST.
To enable Beep and memory count and checkpoint code display when a
successful POST occurs:
1. Enable Power on Status in setup. See “Service Processor Configuration /
Setup Utility” on page H-9.
If the POST detects a problem, an error message appears on your screen. A
single problem can cause several error messages to appear. When you correct the
cause of the first error message, the other error messages probably will not appear
on the screen the next time you turn on the system.
POST Beep Codes
The Power On Self-Test generates a beeping sound to indicate successful
completion of POST or to indicate that the tests detect an error.
One beep and the appearance of text on the display indicates successful
completion of the POST. More than one beep indicates that the POST detects an
error.
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Copyright IBM Corp. 1999
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