v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See Chapter 3, “Parts listing, System x3400 Types 7973, 7974, 7975 and 7976,” on page 87 to determinewhich components are customer replaceable units (CRU) and which components are field replaceableunits (FRU).v If an action step is preceded by “(Trained service technician only),” that step must be performed only by atrained service technician.System-error log message ActionSystem 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 onthe system board2. (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 onthe system board2. (Trained service technician only) Replace the system board.System over recommended voltage oncontinuous +5v 1. Reseat the following components:a. Hot-swap power supplies (if any are installed)b. (Trained service technician only) Power-supply cables onthe system board2. (Trained service technician only) Replace the system board.System shut off due to system board undertemperature 1. Make sure that the fans have good airflow and are notobstructed.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 onthe system board2. (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 onthe system board2. (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 onthe system board2. (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 onthe system board2. (Trained service technician only) Replace the system board.Chapter 2. Diagnostics 79
