Lenovo System x3650 M5 Installation And Service Manual page 87

-48V return
Figure 53. 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 OUT
On On/
Blinking
Off Off
Off Off
Off On/
Blinking
Off On/
Blinking
Ground
-48V
Error (!) Description
Off Normal operation.
Off No ac power to the
server or a
problem with the
ac power source.
On The power supply
has failed.
The power supply
Off
has failed.
On The power supply
has failed.
Power input LED
Power output LED
Power error LED
Action
1. Check the ac 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.
Notes
When the OUT LED is
blinking as a 1Hz rate,
the PSU is at
STANDBY mode, i.e.
no DC power output
from this PSU
This is a normal
condition when no ac
power is present.
.
Chapter 3 Troubleshooting
75