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 operator information 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 Safety and Handling static-sensitive devices.
If an error occurs, view the light path diagnostics LEDs and 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 event log or system-error log might be required.
The following illustration shows the operator information panel
on the front of the server.
Figure 1. Operator information panel
The following table describes the LEDs on the operator information
panel and suggested actions to correct the detected problems.
- Follow the suggested actions in the order in which they are listed
in the Action column until the problem is solved.
- If an action step is preceded by '(Trained technician only)',
that step must be performed only by a Trained technician.
- Go to the Lenovo support website at the Lenovo Support Portal to check for technical information, hints, tips,
and new device drivers or to submit a request for information.
Table 1. The suggested actions to correct the detected problem for each
LED light. Three
column table for documenting the LED, description, and action.
LED |
Description |
Action |
System locator (blue) |
This LED is used as a presence
detection button. You can use Systems Director or IMM2 to light this LED remotely. |
Use this LED to visually locate
the server among other servers. |
Check log (yellow) |
An error has occurred and cannot
be isolated without performing certain procedures. |
- Check the IMM2 event log and the system-error log for information about
the error.
- Save the log if necessary and clear the log afterwards.
|
System-error (yellow) |
An error has occurred. |
- Check the light path diagnostics LEDs and follow the instructions.
- Check the IMM2 event log and the system-error log for information about
the error.
- Save the log if necessary and clear the log afterwards.
|