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 x3350 Type 4192 and 4193 server,” on page 45 to determine whichcomponents 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 atrained service technician.System event/error log message Action12v planar fault 1. If the OVER SPEC LED on the light path diagnostics panel islit or the system power error LED on the system board is lit,see the actions in “Power problems” on page 142. (See“System-board LEDs” on page 12 for the location of the systempower error LED.)2. If the actions in “Power problems” on page 142 do not identifya defective component, complete the following steps:a. Remove the power supplies. Replace the power suppliesone at a time, restarting the server each time, to isolate afailing power supply.b. Replace the power backplane. Restart the server.c. (Trained service technician only) Replace the system board.+5v critical over voltage fault 1. Remove the following devices, which are powered by 5 volts:v All PCI adaptersv USB devicesv CD-RW/DVD drivev Hard disk drive backplane2. Reinstall each I/O device that you removed in step 1, one at atime, restarting the server each time, to isolate a defectivedevice. Replace any defective device.3. If the error continues, replace the power backplane. Restart theserver.4. (Trained service technician only) Replace the system board.+5v critical under voltage fault 1. Remove the following devices, which are powered by 5 volts:v All PCI adaptersv USB devicesv CD-RW/DVD drivev Hard disk drive backplane2. Reinstall each I/O device that you removed in step 1, one at atime, restarting the server each time, to isolate a defectivedevice. Replace any defective device.3. Replace the power backplane. Restart the server.4. (Trained service technician only) Replace the system board.The system real time clock battery is no longerreliable.Replace the battery.+3.3v critical over voltage fault 1. Remove all PCI adapters.2. Reinstall each PCI adapter, one at a time, restarting the servereach time, to isolate a defective adapter. Replace any defectiveadapter.3. (Trained service technician only) Replace the system board.216 IBM System x3350 Type 4192 and 4193: Problem Determination and Service Guide
