IBM System x3755 Problem Determination And Service Manual page 160

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.
System-error log message
12V K Bus Fault
12V Planar Fault
12V Planar over voltage
12V Planar under voltage
12V Power Good Fault
240V Fault
3.3V Bus Fault
3.3V Planar over voltage
3.3V Planar under voltage
144
IBM System x3755 Type 8877 and 7163: Problem Determination and Service Guide
Action
1. Reseat fan 6.
2. Remove fan 6 to isolate the problem.
3. Reseat the DIMMs in microprocessor/memory card 4. See
"Removing a DIMM" on page 48 and "Replacing a DIMM" on
page 49.
4. Replace the following components one at a time, in the order
shown, restarting the server each time:
a. Failing DIMM, see "Removing a DIMM" on page 48 and
"Replacing a DIMM" on page 49.
b. Microprocessor/memory card 4. See "Removing a
microprocessor/memory card" on page 51 and "Replacing a
microprocessor/memory card" on page 51.
c. (Trained service technician only) I/O board. See "Removing
the I/O board assembly" on page 68 and "Replacing the I/O
board assembly" on page 69.
(Trained service technician only) Replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing
the I/O board assembly" on page 69.
(Trained service technician only) Replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing
the I/O board assembly" on page 69.
(Trained service technician only) Replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing
the I/O board assembly" on page 69.
1. Reseat the microprocessor/memory cards, see "Removing a
microprocessor/memory card" on page 51 and "Replacing a
microprocessor/memory card" on page 51.
2. (Trained service technician only) Replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing
the I/O board assembly" on page 69.
(Trained service technician only) Replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing
the I/O board assembly" on page 69.
(Trained service technician only) Replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing
the I/O board assembly" on page 69.
(Trained service technician only) Replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing
the I/O board assembly" on page 69.
(Trained service technician only) Replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing
the I/O board assembly" on page 69.