IBM 7378, Problem Determination And Service Manual

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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 4, “Parts listing, System x3400 M3 Types 7378 and 7379,” on page 141 to determine which
components are customer replaceable units (CRU) and which components are field replaceable units
(FRU).
v
If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Memory uncorrectable error detected
for DIMM All DIMMs on Memory
Subsystem All DIMMs. Error A memory uncorrectable
error has occurred.
5. (Trained service technician
only) If the problem occurs on
the same DIMM connector,
check the DIMM connector. If
the connector contains any
foreign material or is
damaged, replace the system
board (see “Removing the
system board” on page 296
and “Installing the system
board” on page 298).
6. (Trained service technician
only) Remove the affected
microprocessor and check the
microprocessor socket pins
for any damaged pins. If a
damage is found, replace the
system board (see “Removing
the system board” on page
296 and “Installing the system
board” on page 298).
7. (Trained Service technician
only) Replace the affected
microprocessor (see
“Removing a microprocessor
and heat sink” on page 284
and “Installing a
microprocessor and heat sink”
on page 286).
Chapter 3. Diagnostics
51