IBM System x3950 Type 8878 Service Manual page 127

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, Type 8878 and 8879," on page 23 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Operator
Power-supply
information
LEDs
panel
power-on
AC DC LED
Off Off Off
Lit Off Off
Lit Lit Off
Lit Lit Flashing
Lit Lit
Description
No power to the
server, or a problem
with the ac power
source.
DC source power
problem
Standby power
problem
System power-on
problem
Lit The power is good.
Action
1. Check the ac power to the server.
2. Make sure that the power cord is connected to a
functioning power source.
3. Remove one power supply at a time.
1. Make sure that the microprocessor tray is connected
to the power backplane.
2. Remove one power supply at a time.
3. View the system-error log (see "Error logs" on page
71).
1. View the system-error log (see "Error logs" on page
71).
2. Remove one power supply at a time.
3. (Trained service technician only) Replace the power
backplane.
1. View the system-error log (see "Error logs" on page
71).
2. Press the power-control button on the operator
information panel.
3. (Trained service technician only) Use the
force-power-on jumper as a debugging aid (see "I/O
board internal connectors and jumpers" on page 8) to
determine whether the information panel switch and
cable are faulty.
4. Remove the optional Remote Supervisor Adapter II
SlimLine, and try to turn on the server.
5. Reseat the microprocessor tray.
6. (Trained service technician only) Replace the
microprocessor tray.
No action.
111
Chapter 5. Diagnostics