IBM System x3755Types 7163, Problem Determination And Service Manual

Page: 118 / 210

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, System x3755 Type 8877 and 7163,” on page 25 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.
Symptom Action
Multiple rows of DIMMs in a
branch are identified as failing.
1. Reseat the DIMMs; then, restart the server. See “Removing a DIMM” on page
48 and “Replacing a DIMM” on page 49.
2. Remove the lowest-numbered DIMM pair of those that are identified and
replace it with an identical pair of known good DIMMs; then, restart the server.
Repeat as necessary. If the failures continue after all identified pairs are
replaced, go to step 4.
3. Return the removed DIMMs, one pair at a time, to their original connectors,
restarting the server after each pair, until a pair fails. Replace each DIMM in the
failed pair with an identical known good DIMM, restarting the server after each
DIMM. Replace the failed DIMM. Repeat step 3 until you have tested all
removed DIMMs.
4. (Trained service technician only) Replace the system board.
102
IBM System x3755 Type 8877 and 7163: Problem Determination and Service Guide