IBM 7163, 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 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 Action
12V A Bus Fault
1. Reseat microprocessor/memory card 1. See “Removing a
microprocessor/memory card” on page 51 and “Replacing a
microprocessor/memory card” on page 51.
2. Replace the following components one at a time, in the order
shown, restarting the server each time:
a. Microprocessor/memory card 1. See “Removing a
microprocessor/memory card” on page 51 and “Replacing a
microprocessor/memory card” on page 51.
b. (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.
12V B Bus Fault
1. Reseat microprocessor/memory card 2. See “Removing a
microprocessor/memory card” on page 51 and “Replacing a
microprocessor/memory card” on page 51.
2. Replace the following components one at a time, in the order
shown, restarting the server each time:
a. Microprocessor/memory card 2. See “Removing a
microprocessor/memory card” on page 51 and “Replacing a
microprocessor/memory card” on page 51.
b. (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.
12V C Bus Fault
1. Reseat microprocessor/memory card 3. See “Removing a
microprocessor/memory card” on page 51 and “Replacing a
microprocessor/memory card” on page 51.
2. Replace the following components one at a time, in the order
shown, restarting the server each time:
a. Microprocessor/memory card 3. See “Removing a
microprocessor/memory card” on page 51 and “Replacing a
microprocessor/memory card” on page 51.
b. (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.
12V D Bus Fault
1. Reseat microprocessor/memory card 4. See “Removing a
microprocessor/memory card” on page 51 and “Replacing a
microprocessor/memory card” on page 51.
2. Replace the following components one at a time, in the order
shown, restarting the server each time:
a. Microprocessor/memory card 4. See “Removing a
microprocessor/memory card” on page 51 and “Replacing a
microprocessor/memory card” on page 51.
b. (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.
Chapter 5. Diagnostics
141