Identifying Problems Using The Light Path Diagnostics; The Diagnostic Panel; Leds On The Top Of The Server; Leds On The Smp Modules And System Boards - IBM eServer xSeries 440 Installation Manual

Solving problems

Identifying problems using the Light Path Diagnostics

This section provides the information needed to identify problems that might arise
during installation using the Light Path Diagnostic feature.

The diagnostic panel

The diagnostics panel should be the first place you look for help in identifying
problems. If a system error occurs, the system error light on the front of this panel
is lit. Press the front of the panel to open it 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, then close the panel.

LEDs on the top of the server

Another location you can use to find an error is on the top of the server. After
viewing the diagnostic panel, pull the server out and view the top cover. In the
center of the top cover is a set of 6 LEDs and the system service labels. The
numbers next to the LEDs correspond to the numbers located on the system
service label. Note the lit LED, and refer to 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 SMP Modules and system boards

To locate the actual component that caused the error, you must 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
diagnostic 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 to remove the lower SMP Expansion
Module. This tells you that the problem occurred with one of the microprocessors in
the lower SMP Module. Follow the instructions to remove the lower SMP Module;
then, remove the cover from the SMP Module. Located near the edge connectors
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 the Option Installation Guide on the IBM Documentation CD to remove and
replace the microprocessor.
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xSeries 440: Installation Guide