Diagnosing Problems Using Light Path Diagnostics - IBM xSeries 455 Installation Manual

diagnosing problems using these LEDs.

Diagnosing problems using light path diagnostics

LEDs in three locations on the server are available to help you diagnose problems
that might occur during installation. Use them in the following order:
1. Light path diagnostics panel - Look at this panel first. If a system error has
2. LEDs on the top of the server - Slide the server out of the rack cabinet. There
3. LEDs on the system boards - To identify the component that is causing the
The following example illustrates how to use light path diagnostics to diagnose a
system error:
1. Note that the CPU LED on the light path diagnostics panel is lit.
2. Note that LED 2 on the top of the server is lit. The instructions on the system
3. Press and hold the switch on the circuit board until you locate the lit LED beside
4. Follow the instructions in the Option Installation Guide on the IBM xSeries
occurred, the system-error LED on the front of the light path diagnostics drawer
is lit. Press on the front of the light path diagnostics drawer to access the light
path diagnostics panel. Note any LEDs that are lit, and then close the drawer.
are six LEDs and a system service label in the center of the top cover. The
numbers beside the LEDs correspond to numbers on the system service label.
Note the lit LEDs and follow the instructions in the corresponding numbered
blocks on the label.
error, note the lit LED beside the component.
service label corresponding to LED 2 indicate that one of the microprocessors is
defective. Follow the instructions on the label to remove the processor board.
the defective microprocessor.
Documentation CD to remove and replace the microprocessor.
Chapter 5. Solving problems
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