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Light path diagnostics panel

The light path diagnostics panel is located on the top of the operator information panel.

Note
The system service label on the underside of the cover also provides information about the location of the light path diagnostics LEDs.

To access the light path diagnostics panel, slide the blue release latch on the operator panel to the left. Pull forward on the panel until the hinge of the operator panel is free of the server chassis. Then pull down on the panel, so that you can view the light path diagnostics panel information.

Note
When you slide the light path diagnostics panel out of the server to check the LEDs or checkpoint codes, do not run the server continuously with light path diagnostics panel outside of the server. The panel should only be outside of the server a short time. The light path diagnostics panel must remain in the server when the server is running to ensure proper cooling.
Figure 1. Light path diagnostics panel exposure
Light path diagnostics panel exposure
The following illustration shows the LEDs and controls on the light path diagnostics panel.
Figure 2. Light path diagnostics panel exposure
Light path diagnostics panel
  • Remind button: This button places the system-error LED on the front panel into Remind mode. In Remind mode, the system-error LED flashes every 2 seconds until the problem is corrected, the system is restarted, or a new problem occurs.

    By placing the system-error LED indicator in Remind mode, you acknowledge that you are aware of the last failure but will not take immediate action to correct the problem. The remind function is controlled by the IMM.

  • NMI button: Press this button to force a nonmaskable interrupt to the microprocessor. It allows you to blue screen the server and take a memory dump (use this button only when directed by the IBM service support).
  • Checkpoint code display: This display provides a checkpoint code that indicates the point at which the system stopped during the boot block and POST. A checkpoint code is either a byte or a word value that is produced by UEFI. The display does not provide error codes or suggest components to be replaced.
  • Reset button: Press this button to reset the server and run the power-on self-test (POST). You might have to use a pen or the end of a straightened paper clip to press the button. The Reset button is in the lower right-hand corner of the light path diagnostics panel.

For additional information about the light path diagnostics panel LEDs, see Light path diagnostics LEDs.

  • Light path diagnostics LEDs
    The following table describes the LEDs on the light path diagnostics panel and suggested actions to correct the detected problems.