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The system-error LED on the operator information panel is lit when certain system
errors occur. If the system-error LED on the server is lit, one or more LEDs inside
the server might be lit. Use the Light Path Diagnostics panel to identify the type of
error that occurred, and see "Light Path LED errors" on page 159 to help determine
the cause of the error and the action you should take.
To view the LEDs on the various main boards, look at the board indicated by the
diagnostic panel.
To acknowledge a system error but not take immediate action, press the REMIND
button, and place the Light Path Diagnostics feature in Remind mode. The
system-error LED flashes in Remind mode. If a new failure occurs, the system-error
LED is lit again.
The diagnostics panel
The diagnostics panel should be the first place you look for help with identifying
problems. If a system error occurs, the system-error LED on the front of this panel
is lit. Press the front of the panel to open the diagnostics panel, and look for any lit
LEDs. These lit LEDs can help you identify the possible cause of the error. Make a
note of any LEDs that are lit, and then close the panel.
LEDs on the top of the server
You can also use the LEDs on the top of the server to find an error. If the BOARD
LED on the diagnostics panel is lit, pull the server out, and view the top cover. In
the center of the top cover is a set of six LEDs and the system service labels. The
numbers next to the LEDs correspond to the numbers on the system service label.
Note the lit LED, and see the numbered block on the system service label that
corresponds to the lit LED. Then, follow the instructions, if any, in the numbered
block.
LEDs on the system boards
To locate the actual component that caused the error, locate the lit LED next to that
component.
For example:
A system error has occurred, and you have noted that the CPU LED is lit on the
diagnostics panel. Referring to the LEDs on the top cover, you see that LED 2 is lit.
You then locate the panel on the system service label with the number 2 on it. In
this case, the instructions in the panel tell you that the problem occurred with one of
the microprocessors. Follow the instructions to remove the processor-board
assembly. See "Processor-board assembly" on page 129. Located on the circuit
board is the light-path capacitor switch. Press and hold the switch until you locate
the lit LED next to the defective microprocessor. Follow the instructions in
"Microprocessor and power module" on page 131 and "Installing and replacing a
microprocessor and power module" on page 99 to remove and replace the
microprocessor.
For more information about LEDs and connectors, see "Major components of the
xSeries 455 server" on page 79.
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Chapter 3. Diagnostics
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Table of Contents
Troubleshooting
