IBM 6000R Hardware Maintenance Manual - Page 35

Table 1. Light path diagnostics LED on PS3 Fan Cause The third power supply has failed. (See "Diagnostic panel error LEDs" on page 157.) One of the fan assemblies has failed or is operating too slowly. Note: A failing fan can also cause the TEMP and/or DASD LEDs to be on. DASD NMI (See "Diagnostic panel error LEDs" on page 157.) A hot-swap hard disk drive has failed on SCSI channel B. (See "Diagnostic panel error LEDs" on page 157.) A nonmaskable interrupt occurred. (The PCIA, PCIB, PCIC, or Memory LED will probably also be on.) Note: The NMI LED can only be reset by comletely removing power from system. (See "Diagnostic panel error LEDs" on page 157.) SP The service processor has failed. (See "Diagnostic panel error LEDs" on page 157.) Event Log Non Red Over Spec Temp Not implemented at this time. System is operating in non-redundant power mode. (See "Diagnostic panel error LEDs" on page 157.) The server is drawing more power than the power supplies are rated for. (See "Diagnostic panel error LEDs" on page 157.) The system temperature has exceeded the maximum rating. (See "Diagnostic panel error LEDs" on page 157.) Power checkout Power problems can be difficult to troubleshoot. For instance, a short circuit can exist anywhere on any of the power distribution busses. Usually a short circuit will cause the power subsystem to shut down because of an overcurrent condition. A general procedure for troubleshooting power problems is as follows: 1. Power off the system and disconnect the AC cord(s). 2. Check for loose cables in the power subsystem. Also check for short circuits, for instance if there is a loose screw causing a short circuit on a circuit board. 3. Remove adapters and disconnect the cables and power connectors to all internal and external devices until system is at minimum configuration required for Diagnostics 23