IBM 88643RU - System x3850 - 8864 Service Manual page 83

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 8864," on page 23 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.
Beep code
Three short beeps
Description
Memory error.
Action
Note: Make sure you re-enable the memory in
the Configuration/Setup Utility program. See,
"Memory problems" on page 93
1. Reseat the DIMMs.
2. Locate the failing DIMMs:
a. Remove all the DIMMs from the server.
b. Beginning with the primary bank of
DIMM connectors, install one bank of
DIMMs at a time in the server, restarting
the server each time untill the beep
code error returns.
c. Replace one pair of DIMMs at a time in
the failing bank with an identical pair of
known good DIMMs, restarting the
server after each pair, until the beep
code error returns.
d. Replace one DIMM at a time in the
failing pair with an identical known good
DIMM, restarting the server after each
DIMM, to identify the failed DIMM. If the
beep code error remains after replacing
both DIMMs, go to step 3b.
e. Repeat steps2b through 2d until all
memory banks have been checked.
3. Replace the following components, one at a
time, in the order shown:
a. DIMMs
b. (Trained service technician only) System
board
Chapter 5. Diagnostics
67