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Light path diagnostics
Light path diagnostics is a system of LEDs on the control panel and on the system
board of the blade server. When an error occurs, LEDs are lit throughout the blade
server. If the control panel indicates an error, use the descriptions of the LEDs to
diagnose the problem and take corrective action.
LEDs are available for the following components:
v Battery
v Hard disk drive
v Management card
v Memory modules (DIMMs)
v PCIe high speed expansion card option
v PCI-X expansion card option
v System board and chassis assembly
Viewing the light path diagnostic LEDs
After reading required safety information, look at the control panel to determine if
the LEDs indicate a sub-optimal condition or an error.
Before working inside the blade server to view light path diagnostic LEDs, read
"Safety" on page v and "Handling static-sensitive devices" on page 238.
If an error occurs, view the light path diagnostic LEDs in the following order:
1. Look at the control panel on the front of the blade server. See "Blade server
2. If an error has occurred, view the light path diagnostics panel and LEDs:
218
JS22 Type 7998: Problem Determination and Service Guide
control panel buttons and LEDs" on page 4.
v If the information LED is lit, it indicates that information about a suboptimal
condition in the blade server is available in the management-module event
log.
v If the blade-error LED is lit, it indicates that an error has occurred and you
should proceed to the next step.
a. Remove the blade server from the BladeCenter unit.
b. Place the blade server on a flat, static-protective surface.
c. Remove the cover from the blade server.
d. Press and hold the light path diagnostics switch to relight the LEDs that
were lit before you removed the blade server from the BladeCenter unit.
The LEDs will remain lit for as long as you press the switch, to a maximum
of 25 seconds.
Figure 4 on page 219 shows the locations of error LEDs on the system board:
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