Light path diagnostics
Light path diagnostics is a system of LEDs on various external and internal
components of the server. When an error occurs, LEDs are lit throughout the
server. 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 and the top cover is closed and latched 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 32.
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 Log LED is lit, it indicates that information about a suboptimal
condition in the server is available in the IMM system-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:
2. To view the advanced operator information panel, press the blue latch on the
right of the operator panel. Lit LEDs on this panel indicate the type of error
that has occurred.
106 System x3530 M4 Type 7160: Installation and Service Guide
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