Lenovo System x3550 M4 Installation And Service Manual page 145

Figure 90. DC power-supply LEDs
The following table describes the problems that are indicated by various combinations of the power-supply
LEDs on a dc power supply and suggested actions to correct the detected problems.
DC power-supply LEDs
IN OK OUT OK
On On
Off Off
Off Off
Off On
Off On
On Off
Error (!) Description
Off Normal operation.
No dc power to the
Off
server or a problem
with the dc power
source.
On The power supply
has failed.
Off The power supply
has failed.
The power supply
On
has failed.
Off Power-supply not
fully seated, faulty
system board, or
the power supply
has failed.
Action
1. Check the dc power to the
server.
2. Make sure that the power
cord is connected to a
functioning power source.
3. Restart the server. If the
error remains, check the
power-supply LEDs.
4. If the problem remains,
replace the power-supply.
Replace the power supply.
Replace the power supply.
Replace the power supply.
1. Reseat the power supply.
2. Follow actions in the "Power
problems" on page 148.
3. If the OVER SPEC LED on
the light path diagnostics is
lit, follow the actions in "Light
path diagnostics LEDs" on
page 124.
4. If the OVER SPEC LED on
the light path diagnostics is
not lit, check the error LEDs
on the system board and the
IMM2 error messages. Follow
steps in "Power problems" on
Notes
This is a normal
condition when no dc
power is present.
Typically indicates a
power-supply is not
fully seated.
.
Chapter 4 Troubleshooting
131