IBM System x3400 Type 7973, 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 x3400 Types 7973, 7974, 7975 and 7976,” on page 87 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
System over recommended voltage for +12v
1. Reseat the following components:
a. Hot-swap power supplies (if any are installed)
b. (Trained service technician only) Power-supply cables on
the system board
2. (Trained service technician only) Replace the system board.
System over recommended voltage on +2.5v
1. Reseat the following components:
a. Hot-swap power supplies (if any are installed)
b. (Trained service technician only) Power-supply cables on
the system board
2. (Trained service technician only) Replace the system board.
System over recommended voltage on
continuous +5v
1. Reseat the following components:
a. Hot-swap power supplies (if any are installed)
b. (Trained service technician only) Power-supply cables on
the system board
2. (Trained service technician only) Replace the system board.
System shut off due to system board under
temperature
1. Make sure that the fans have good airflow and are not
obstructed.
2. (Trained service technician only) Replace the system board.
System shutoff due to +12v over voltage
1. Reseat the following components:
a. Hot-swap power supplies (if any are installed)
b. (Trained service technician only) Power-supply cables on
the system board
2. (Trained service technician only) Replace the system board.
System shutoff due to +12v under voltage
1. Reseat the following components:
a. Hot-swap power supplies (if any are installed)
b. (Trained service technician only) Power-supply cables on
the system board
2. (Trained service technician only) Replace the system board.
System shutoff due to +2.5v over voltage
1. Reseat the following components:
a. Hot-swap power supplies (if any are installed)
b. (Trained service technician only) Power-supply cables on
the system board
2. (Trained service technician only) Replace the system board.
System shutoff due to +2.5v under voltage
1. Reseat the following components:
a. Hot-swap power supplies (if any are installed)
b. (Trained service technician only) Power-supply cables on
the system board
2. (Trained service technician only) Replace the system board.
Chapter 2. Diagnostics
79