Undetermined Problems - IBM 3746-900 Installation And Maintenance Manual

Undetermined Problems

If an undetermined problem exists, check the power supply voltages (see "Power
Supply" on page 3-20). If the voltages are correct, return here and continue with
the following steps.
1. Power OFF the computer.
2. Remove or disconnect the following devices, if installed, one at a time:
3. Power-on the computer to retest the system.
4. Repeat steps 1 through 3 until you find the failing device or adapter.
If all devices and adapters have been removed, and the problem continues, replace
the system board (see "Before Replacing a System Board").
Before Replacing a System Board
The BIOS and Vital Product Data (VPD) for the Service Processor must be installed
on the new system board after it is installed in the Service Processor. To do this,
you must run the Flash Update Diskette. See "Flash (BIOS/VPD) Update
Procedure" on page 3-33.
Always ensure that the latest level of BIOS is installed on the computer. A
down-level BIOS might cause false error messages and unnecessary replacement
of the system board.
The processor is a separate FRU from the system board and is not included with
the system board FRU. If you are instructed to replace the system board, perform
the following steps:
1. Remove the processor from the old system board and install it on the new
2. Remove the memory modules on the old system board, and install them on the
3. Ensure that the new system board jumper settings match the old system board
4. If the new system board does not correct the problem, reinstall the options on
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3745-XXA 3-22 3746-9X0: 6578 SPIM
a. Non-IBM devices
b. External devices (modem, printer, or mouse)
c. Any adapters
d. Memory modules
Note: Before removing or replacing memory modules, see "System Board
Memory" on page 3-37.
e. Extended video memory
f. External Cache
g. External Cache RAM
h. Hard disk drive
i. Diskette drive
system board.
new system board.
jumper settings.
the old system board, reinstall the old system board, then replace the
processor.