AT&T 3B2 Maintenance Reference Manual page 319

Requesting System Board Diagnostics
In response to the
DGMON
>
prompt, request the complete set of SBD diagnostic phases
(normal and demand) as outlined below. (A formatted floppy diskette is required for the
floppy disk diagnostics.)
1.
Issue the
dgn sbd ph=*
command.
NOTE: Release-specific exceptions might require a change in the way diagnostics
are called. See Product Updates or Release Notes, if applicable.
2. Follow any special instructions printed with the Interactive phases. The system
responds with a series of diagnostic reports as the phases are run. If no failures
occur, the final message will include the message
SBD
O
DIAGNOSTICS
PASSED.
If there is a problem in the hardware, the diagnostic monitor will return
a message
SBD 0 DIAGNOSTICS FAILED
and cease execution at the failing
phase. Repeat the phase. Note the specific diagnostic that was being run at the
time that the failure occurred. Each phase runs several different tests.
The diagnostic phases report a series of numbers as the diagnostics are executing.
These numbers are the test numbers of the individual tests run within each phase.
The last test number printed before the failure message identifies the test that was
executing at the time of failure. For a complete listing of all diagnostic phases and
tests, see the
AT&T 3B2 Computer Off-Line Diagnostics Manual.
3. Some system board diagnostics test the hard and floppy disk drives, as well as
their system board interface components. When executing the floppy diagnostic, a
pre-formatted diskette that is not write-protected must be used. The hard disk
diagnostic phases of the
3B2
computer require the drive to have the correct
software written on it, and all interface connectors to be in place. For more
information about system board diagnostics, refer to the
AT&T 3B2 Computer Off-
Line Diagnostics Manual.
NOTE: On some earlier releases of the UNIX system, system board diagnostic
phase #20 failed if the system was equipped with a 72 MB hard disk drive. This
has been fixed in UNIX System V Release 2.0 Version 2 and later releases.
Also, if the system board is a CM190A, the 72 MB hard disk will not operate
unless the system board is an artmaster 5 series 27 (or higher) or any artmaster 6.
AMS
Ser.
XX
or AM6 Ser.
XX
is printed on the system board on the edge near the
memory board connectors.
4. To exit the diagnostic monitor, enter q in response to the
DGMON
>
prompt.
For additional information on how to use the diagnostic monitor, see the
AT&T 3B2 Computer
Owner/Operator Manual
or the
AT&T 3B2 Computer Off-Line Diagnostics Manual.
Using the Diagnostic Monitor
B-7