IBM 79463AU, Installation And User Manual

Page: 46 / 142

Power-supply LEDs
Description Action Notes AC DC Error
Off Off Off No ac power to the
server or a problem
with the ac power
source.
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. Replace the power-supply.
This is a normal
condition when no ac
power is present.
Off Off On No ac power to the
server or a problem
with the ac power
source and the
power-supply had
detected an internal
problem.
v
Make sure that the power cord
is connected to a functioning
power source.
v
Replace the power supply.
This happens only
when a second power
supply is providing
power to the server.
Off On Off Faulty
power-supply Replace the power supply.
Off On On Faulty
power-supply Replace the power supply.
On Off Off Power-supply not
fully seated, faulty
system board, or
faulty power-supply
1. Reseat the power supply.
2. If the 240 V failure LED on
the system board is not lit,
replace the power-supply.
3. If the 240 V failure LED on
the system board is lit,
(trained service technician
only) replace the system
board.
Typically indicates a
power-supply is not
fully seated.
On Off On Faulty
power-supply Replace the power supply.
On On Off Normal operation
On On On Power-supply is
faulty but still
operational Replace the power supply.
The following illustration shows the locations of the power-supply LEDs on the dc
power supply.
-48V return Ground -48V
Power input LED
Power output LED
Power error LED
30
IBM System x3550 M2 Types 4198 and 7946: Installation and User’s Guide