AT&T 3B2 Maintenance Reference Manual page 126

Trouble Analysis
As a first attempt to dear a sanity failure, push down firmly on all socketed components on
the system board. Remove the memory board(s), and I/0 backplane. Reseat the boards
firmly. H the problem recurs, replace the system board. If a different source for the problem is
indicated by a firmware error message or diagnostic failure, try to fix that related problem
before replacing the system board.
Error Messages
Error messages generated by system firmware and software are primary sources of information
about an error or a fault condition. The system console displays various error messages for
your information during trouble situations. Types of error messages are as follows:
• firmware error messages
Firmware error messages are displayed on the console when the system is not
running UNIX software. Diagnostic error messages, that are returned directly
from the diagnostic monitor control program, are an exception. Firmware
error messages are listed and explained in the next section.
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diagnostic monitor error messages
The diagnostic monitor provides the ability to execute hardware tests on the
3B2 computer. H a problem occurs while using the diagnostic control
program, an error message is displayed on the console terminal. See
Appendix C, "Using 3B2 Computer Maintenance Utilities," for more
information on diagnostic error messages.
• boot error messages
Boot firmware provides the ability to execute a number of disk-resident
programs, including the diagnostic monitor, the UNIX operating system, and
other utilities. Boot errors may appear on the console while attempting to
execute these programs. Boot errors are not covered in the document. For
descriptions of and corrective actions for boot error messages, see the AT&T
3B2 Computer Error Message Reference Manual.
• autopump error messages
Autopump is a feature that detects and automatically downloads firmware to
feature cards mounted in the 3B2 computer backplane slots during the power
up sequence. Autopump error messages appear on the console terminal when
a phase in the autopump sequence fails. Although these errors are not fatal to
the entire system, the affected card will not be operational. Therefore, normal
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AT&T 382 Computer Maintenance Reference Manual