IBM x3630 M3 7377, Problem Determination And Service Manual

Page: 31 / 294

The following illustration shows the LEDs on the rear of the server.
AC
DC
AC
DC
AC power
LED
DC power
LED
Power-supply
error LED
Ethernet activity
LED Ethernet link
LED
Ethernet activity LEDs: When these LEDs are lit, they indicate that the server is
transmitting to or receiving signals from the Ethernet LAN that is connected to the
Ethernet port.
Ethernet link LEDs: When these LEDs are lit, they indicate that there is an active
link connection on the 10BASE-T, 100BASE-TX, or 1000BASE-TX interface for the
Ethernet port.
AC power LED: Each hot-swap power supply has an ac power LED and a dc
power LED. When the ac power LED is lit, it indicates that sufficient power is
coming into the power supply through the power cord. During typical operation, both
the ac and dc power LEDs are lit. For any other combination of LEDs, see
“Power-supply LEDs.”
DC power LED: Each hot-swap power supply has a dc power LED and an ac
power LED. When the dc power LED is lit, it indicates that the power supply is
supplying adequate dc power to the system. During typical operation, both the ac
and dc power LEDs are lit. For any other combination of LEDs, see “Power-supply
LEDs.”
Power-supply error LED: When the power-supply error LED is lit, it indicates that
the power supply has failed.
Power-supply LEDs
The following illustration shows the power-supply LEDs on the rear of the server.
For more information about solving power-supply problems, see “Power problems”
on page 51.
AC
DC
AC
DC
AC power
LED
DC power
LED
Power-supply
error LED
AC
DC
The following table describes the problems that are indicated by various
combinations of the power-supply LEDs and suggested actions to correct the
detected problems.
Chapter 2. Introduction
13