IBM 7944, Installation And User Manual

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AC power-supply LEDs
Description
Action Notes AC DC
Error (!)
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.
• Make sure that the power cord
is connected to a functioning
power source.
• 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 a power channel error LED
on the system board is not lit,
replace the power-supply
(see the documentation that
comes with the power supply
for instructions).
3. If a power channel error 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 On Power-supply is
faulty but still
operational Replace the power supply.
DC power-supply LEDs
Use this information to view DC power-supply LEDs.
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
Figure 13. DC power-supply LEDs
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System x3550 M3Installation and User's Guide