Lenovo THINKSERVER 3821 - Manual (Page 84)

EasyLED diagnostics
EasyLED 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.
Before you work inside the server to view the EasyLED diagnostics LEDs, read the
safety information that begins on page 5.
If an error occurs, view the EasyLED diagnostics LEDs in the following order:
1. Look at the operator information panel LEDs on the front of the server.
v If an operator information panel LED is lit, it indicates that information about a
suboptimal condition in the server is available in the system-event log.
v If the system-error LED is lit, it indicates that an error has occurred; go to
step 2 on page 77.
The following illustration shows the operator information panel LEDs that are
visible through the bezel.
1 System power-on LED
2 Hard disk drive activity LED
3 System-locator LED
4 System-information LED
5 System-error LED
The following table lists the operator information panel LEDs, the problems that
they indicate, and actions to solve the problems.
76 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual
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