Light Path Diagnostics - Lenovo System x3100 M4 Installation And Service Manual

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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
page v and "Handling static-sensitive devices" on page
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.
• If the check log LED is lit, it indicates that an error or multiple errors have occurred. The sources of the
errors cannot be isolated or concluded by observing the light path diagnostics LEDs directly. A further
investigation into IMM2 system-event log or system-error log might be required.
• 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.
Power-on LED Ethernet activity LED
Figure 13. Operator information panel
The following table describes the LEDs on the operator information panel and suggested actions to
correct the detected problems.
System locator LED
Check log LED
System error LED
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Chapter 4 Troubleshooting
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