Light Path Diagnostics Overview; Identifying Problems Using The Light Path Diagnostics - IBM eServer BladeCenter JS20 Installation And User Manual

Light path diagnostics overview

If the system-error LED on the system LED panel on the front or rear of the
BladeCenter unit is lit, one or more error LEDs on the BladeCenter unit components
also might be lit. These LEDs help identify the cause of the problem.

Identifying problems using the light path diagnostics

This section provides the information to identify, using the light path diagnostics,
problems that might arise during installation. To locate the actual component that
caused the error, you must locate the lit error LED on that component.
For example:
A blade server error has occurred and you have noted that the blade server
blade-error LED is lit on the blade-server control panel. You then:
1. Remove the blade server from the BladeCenter unit.
2. Place the blade server on a flat, static-protective surface.
3. Remove the cover from the blade server.
4. Press and hold the light path diagnostics button to relight the LEDs that were lit
See "System-board LEDs" on page 10 for the location of the light path diagnostics
button and error LEDs, then see the "Light path diagnostics table" on page 93.
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BladeCenter JS20 Type 8842: Installation and User's Guide
before you removed the blade server from the BladeCenter unit. The LEDs will
remain lit for as long as you press the button, to a maximum of 25 seconds.