Light path diagnostics
Light path diagnostics is a system of LEDs on various external and internal
components of the server that leads you to the failed component. When an error
occurs, LEDs are lit along the path of the front panel, the light path diagnostics
panel, then on the failed component. By viewing the LEDs in a particular order,
you can often identify the source of the error.
When LEDs are lit to indicate an error, they remain lit when the server is turned
off, provided that the server is still connected to power and the power supply is
operating correctly.
Before you work inside the server to view light path diagnostics LEDs, read the
safety information that begins on page “Safety” on page vii and “Handling
static-sensitive devices” on page 35.
If an error occurs, view the light path diagnostics LEDs in the following order:
1. Look at the operator information panel on the front of the server.
v If the check log LED is lit, it indicates that information about an un-isolated
fault condition in the server is available in the IMM event log or in the
system-event log.
v If the system-error LED is lit, it indicates that an error has occurred; go to
step 2.
The following illustration shows the operator information panel.
Release
button
Light path
diagnostic
LEDs
Operator information
panel
2. To view the light path diagnostics panel, press in on the blue release button on
the operator information panel and pull forward on the panel until the hinge of
the operator information panel is free of the server chassis. Then, pull down on
the panel so that you can view the light path diagnostics panel information.
This reveals the light path diagnostics panel. Lit LEDs on this panel indicate
the type of error that has occurred.
The following illustration shows the light path diagnostics panel.
156 System x3750 M4 Types 8722 and 8733: Installation and Service Guide
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