Power Problems - IBM 72335LU - System x3850 M2 Installation 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 the parts listing in the Problem Determination and Service Guide 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.
Action
1. Make sure that the operator information panel power-control button is working
correctly:
a. Disconnect the ac power cord for 20 seconds; then, reconnect the ac power
cord and restart the server.
b. Reseat the operator information panel cables, and then repeat step 1a.
v 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; 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. Reseat the light path panel cable, and then repeat step1a.
v If the server starts, replace the operator information 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. Operator information panel
c. Power backplane
d. Microprocessor board
5. Replace the following components one at a time, in the order shown, restarting
the server each time.
a. Memory card
b. Operator information panel
c. Power backplane
d. (Trained service technician only) Microprocessor board
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.
Chapter 6. Solving problems
53