IBM 6H0, Service Manual

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MAP 1540: Minimum Configuration
This MAP is used to locate defective FRUs not found by normal diagnostics. For this
procedure, diagnostics are run on a minimally configured system. If a failure is detected
on the minimally configured system, the remaining FRUs are exchanged one at a time
until the failing FRU is identified. If a failure is not detected, FRUs are added back until
the failure occurs. The failure is then isolated to the failing FRU.
Notes:
1. Be sure to unplug the power cable from the rack that contains the CEC drawer, the
primary drawer, and any secondary drawer before removing or installing the
processor cards, memory cards, CEC backplane or I/O backplane to avoid damage.
2. This MAP assumes that a CD-ROM drive is installed and connected to a the
internal SCSI adapter of the primary drawer, and a diagnostics CD-ROM is
available.
3. If a general access password or privileged–access password is installed, you are
prompted to enter the password before the diagnostic CD-ROM can load.
4. The term POST indicators refers to the device mnemonics (words
memory
,
keyboard
,
network
,
scsi
, and
speaker
) that appear on the system console during the power-on
self-test (POST).
5. The service processor may have recorded one or more symptoms in its error log. It
is a good idea to examine that error log before proceeding (see service processor
system information menu).
6. The service processor may have been set by the user to monitor server operations
and to attempt recoveries. You can disable these actions while you diagnose and
service the system. If you disable them, make notes of their current settings so that
you can restore them easily. The following table lists the settings:
Surveillance From the service processor setup menu, go to
the surveillance setup menu and disable
surveillance.
Unattended start From the service processor system power
control menu, disable unattended start mode.
Reboot policy From the system power control menu, go to the
reboot/restart policy setup menu and set:
1. Number of reboot attempts to 0 (zero)
2. Use OS-Defined restart policy to No
3. Enable supplemental restart policy to No .
Call out From the call-in/call-out setup menu, go to the
serial port selection menu and disable call-out
on both serial ports.
Chapter 3. Maintenance Analysis Procedures
113