IBM 8500R - Netfinity - 8681, Hardware Maintenance Manual

Page: 226 / 290

Note
In the case of multiple FRUs, such as power
supplies, processors, processor terminators,
memory cards, and DIMMS, it is prudent to verify
the function of each FRU in the same position or
slot prior to installing multiples of the FRU. This
way, you are working with known-good FRUs. A
failure when multiples are installed indicates
failure of the card the multiple FRUs plug into, or
another related FRU, rather than the FRU you
just installed.
Consider these possibilities:
1. If all processors work in position A-1 but the
system fails with processors in A-1 plus any
other slot on processor daughterboard A,
suspect the processor daughter board
followed by the processor controller board.
2. If all power supplies work in position 1 but
fail in slots 2 or 3, suspect the midplane or
power control card.
3. If all memory DIMMs work in memory board
A slot J1 but fail in any other slot, suspect
the memory board, followed by the
processor control board, and the midplane.
4. If a populated memory card works in
position A but fails in position B, suspect the
processor controller board followed by the
the midplane.
Components should be added in the following order:
a. Front panel (after which you no longer need to
use Jumper J11 on the I/O board to force power
on)
b. Power supplies (one at a time)
c. Processors (one at a time)
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