If an error occurs, view the light path diagnostics LEDs in the following order:1. Check the operator information panel on the front of the server.v If the information LED is lit, it indicates that there is a suboptimal conditionin the server.v If the system-error LED is lit, it indicates that an error has occurred.The following illustration shows the operator information panel.Information LEDSystem-error LED1 2Ethernet icon LEDPower-control button/power-on LEDEthernet port activity LEDs Locator button/locator LEDPower-control button cover2. To view the light path diagnostics panel, press the release latch on the front ofthe operator information panel to the left; then, slide it forward. This revealsthe light path diagnostics panel. Lit LEDs on this panel indicate the type oferror that has occurred.DASDNMIPCIPS SPCNFGMEMCPUFANVRMOVER SPECTEMPLight Path DiagnosticsBRDLOG LINKRAIDREMINDNMI buttonReset buttonRemindbuttonCheck pointcode displayNote: (Trained service technician only) The NMI button is used foroperating-system debugging purposes and will cause the server to reset if it ispressed.Look at the system service label on the top of the server, which gives anoverview of internal components that correspond to the LEDs on the light pathdiagnostics panel. This information and the information in “Light pathdiagnostics LEDs” on page 63 can often provide enough information to correctthe error.3. Remove the server cover and look inside the server for lit LEDs. Certaincomponents inside the server have LEDs that will be lit to indicate the locationof a problem. For example, a microprocessor error will light the LED next tothe failing microprocessor on the microprocessor board.Chapter 3. Diagnostics 59
