Service manual

Chapter 3 Server Diagnostics 3-11
3.2.2 Power Supply LEDs
The power supply LEDs (TABLE 3-3) are located on the back of the power supply.
3.3 Using ALOM CMT for Diagnosis and
Repair Verification
The Advanced Lights Out Management (ALOM) CMT is a system controller in the
server that enables you to remotely manage and administer your server.
ALOM CMT enables you to remotely run diagnostics, such as power-on self-test
(POST), that would otherwise require physical proximity to the server’s serial port.
You can also configure ALOM CMT to send email alerts of hardware failures,
hardware warnings, and other events related to the server or to ALOM CMT.
The ALOM CMT circuitry runs independently of the server, using the server’s
standby power. Therefore, ALOM CMT firmware and software continue to function
when the server operating system goes offline or when the server is powered off.
Note – Refer to the Advanced Lights Out Management (ALOM) CMT Guide for
comprehensive ALOM CMT information.
TABLE 3-3 Power Supply LEDs
Name Color Description
Fault Amber • On – Power supply has detected a failure.
• Off – Normal operation.
DC OK Green • On – Normal operation. DC output voltage is within normal limits.
• Off – Power is off.
AC OK Green • On – Normal operation. Input power is within normal limits.
• Off – No input voltage, or input voltage is below limits.