Power Problems - IBM 8872 - eServer xSeries 460 Service Manual

Power 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 3, "Parts listing, Type 8872 and Type 8874," 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.
Symptom
The power-control button does
not work, and the reset button
does work (the server does not
start).
Note: The power-control button
will not function until 20
seconds after the server has
been connected to ac power.
46
IBM xSeries 460 Type 8872 and xSeries MXE 460 Type 8874: Problem Determination and Service Guide
Action
1. Make sure that the operator information panel power-control button is working
correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. (Trained service technician only) Reseat the operator information panel
cables, and then repeat steps 1a and 1b.
v (Trained service technician only) If the server starts, reseat the operator
information panel. If the problem remains, replace the operator
information panel.
v If the server does not start, bypass the operator information panel
power-control button by using the force power-on jumper (see "I/O board
internal connectors and jumpers" on page 8); if the server starts, reseat
the operator information panel. If the problem remains, replace the
operator information panel.
2. Make sure that the reset button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. (Trained service technician only) Reseat the light path panel cable, and then
repeat steps 1a and 1b.
v (Trained service technician only) If the server starts, replace the light path
panel.
v If the server does not start, go to step 3.
3. Make sure that:
v The power cords are correctly connected to the server and to a working
electrical outlet.
v The type of memory that is installed is correct.
v The memory card is fully seated.
v The LEDs on the power supply do not indicate a problem.
v The microprocessors are installed in the correct sequence.
4. Reseat the following components:
a. Memory card
b. (Trained service technician only) Power switch connector
c. (Trained service technician only) Power backplane
d. I/O board
5. Replace the components listed in step 4 one at a time, in the order shown,
restarting the server each time.
6. If you just installed an optional device, remove it, and restart the server. If the
server now turns on, you might have installed more devices than the power
supply supports.
7. See "Power-supply LEDs" on page 57.
8. See "Solving undetermined problems" on page 90.