IBM PS703 Service Manual page 218

v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v See Chapter 3, "Parts listing, type 7891," on page 225 to determine which components are CRUs and which
components are FRUs.
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Isolation
Symptom
Procedure Code
IOBRDG The failing
Symbolic CRU component is the
RIO/HSL I/O bridge
on the IPL path.
MEMBRD The failing
component is the
Symbolic CRU
board the memory
DIMMs plug into.
MEMCTLR The failing
Symbolic CRU component is one of
the memory
controllers.
206
Power Systems: Problem Determination and Service Guide for the IBM PS703 (7891-73X) and PS704 (7891-74X)
Action
Replace the system board and chassis assembly, as described in
"Replacing the FRU system-board and chassis assembly" on page 264.
Replace the system board and chassis assembly, as described in
"Replacing the FRU system-board and chassis assembly" on page 264.
Replace the system board and chassis assembly, as described in
"Replacing the FRU system-board and chassis assembly" on page 264.