IBM 7985, Problem Determination And Service Manual

Page: 72 / 218

The following illustration shows the locations of the power-supply LEDs.
AC power LED
DC power LED
The following table describes the problems that are indicated by various
combinations of the power-supply LEDs and the power-on LED on the operator
information panel and suggested actions to correct the detected problems.
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 4, “Parts listing, System x3655, Type 7985 and 7943,” on page 93 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.
Power-supply
LEDs
Operator
information
panel
power-on
LED Description Action AC DC
Off Off Off No 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. Remove one power supply at a time.
Lit Off Off DC source power
problem.
1. Remove one power supply at a time.
2. View the system event/error log (see “Error logs” on
page 28).
Lit Lit Off Standby power
problem.
1. View the system event/error log (see “Error logs” on
page 28).
2. Remove one power supply at a time.
3. (Trained service technician only) Replace the power
backplane.
Lit Lit Flashing System power-on
problem.
1. View the system event/error log (see “Error logs” on
page 28).
2. Press the power-control button on the operator
information panel.
3. Remove the optional Remote Supervisor Adapter II
SlimLine, and try to turn on the server.
4. See “Solving power problems” on page 87.
5. (Trained service technician only) Replace the power
backplane.
6. (Trained service technician only) Replace the system
board.
Lit Lit Lit The power is good. No action is necessary.
54
IBM System x3655 Type 7985 and 7943: Problem Determination and Service Guide