Lenovo ThinkServer RD120 Hardware Maintenance Manual page 150

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, ThinkServer RD120 Machine Types 6444, 6445, 6446, and 6447," 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.
Beep code
Three short beeps
132
ThinkServer RD120 server Machine Types 6444, 6445, 6446, and 6447: Hardware Maintenance Manual
Description
Possible memory problem.
Action
1. Reseat the DIMMs.
2. Locate the failing DIMMs:
a. Remove all DIMMs from the server.
b. Beginning with the primary bank of
DIMMs, return one bank of DIMMs to
the server at a time, restarting the
server each time, until 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 you have replaced both DIMMs,
go to step 3b.
e. Repeat steps 2b through 2d until you
have checked all memory banks.
3. Replace the following components, one at
a time, in the order shown:
a. DIMMs
b. (Trained service technician only)
System board