104 IBM xSeries 130: User’s ReferenceIdentifying problems on the model 8654 using status LEDsIf the system-error light in the operator information panel on the front of the applianceserver is on, one or more LEDs inside the appliance server might be on. Use theLight Path Diagnostics panel to identify the type of error that occurred.Note: Light Path Diagnostics is available on the xSeries 130 model 8654 only.For LED locations see the “Light Path Diagnostics panel on the model 8654” on page105.The Light Path Diagnostics panel in your appliance server enables you to quicklyidentify the type of system error that occurred. The Light Path Diagnostics panel islocated on the system board, just behind PCI adapter slot 1. When you press theLight Path Diagnostics button, the LED on the top-right corner of the panel illuminates.This shows that the diagnostic circuitry is working correctly.Your appliance server is designed so that any LEDs that are illuminated can beilluminated again without power after you remove the cover. This feature helps youisolate the problem if an error causes the appliance server to shut down. See “Model8654 Light Path Diagnostics table” on page 105.Important: You have up to 12 hours to use the Light Path Diagnostic LEDs after thepower is removed from the appliance server. After 12 hours, you must turn on theappliance server again to be able to use the Light Path Diagnostic LEDs to help locatesystem errors.To view the LEDs on the system board:1. Turn off the appliance server and peripheral devices.2. Remove all external cables from the appliance server; then, remove theappliance server from the rack and remove the cover. For more information see“Removing the cover” on page 56 for instructions.3. Press and hold the Light Path Diagnostics (blue) button on the diagnostics panel.The LEDs will be illuminated while the switch is pressed.Note: You can illuminate the LEDs for a maximum of 2 minutes. After that time,the circuit that powers the LEDs is exhausted.4. Replace the cover on the appliance server; then, reinstall the appliance server inthe rack and connect all external cables. For more information see “Installing thecover” on page 68 for instructions.
