IBM BladeCenter HT 8740, Problem Determination And Service Manual

Page: 129 / 158

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,” on page 23 to determine which components are CRUs and which
components are FRUs.
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Symptom Action
The BladeCenter HT unit does
not power-on.
1. Make sure that:
a. If the BladeCenter HT unit is a type 8740, dc power modules are installed.
b. If the BladeCenter HT unit is a type 8750, ac power modules are installed.
c. The power modules do not have damaged connectors.
d. All power cords are connected to compatible power sources and the power
sources are working.
e. The input and output LEDs on the power modules are lit.
f. The shuttle release handles are in the closed position and the captive
thumbscrews are tightened.
2. If you just installed an optional device, remove it and restart the BladeCenter
HT unit. If the BladeCenter HT unit now powers-on, you might have installed
more devices than the power modules support. You might have to install power
modules in power-module bays 3 and 4.
3. See “Solving undetermined problems” on page 118.
A new device does not
power-on.
1. Make sure that:
a. Power modules are installed in the power-module bays as necessary.
Power modules are required in power-module bays 3 and 4 if blade servers
are installed in blade bays 7 through 12 or if I/O modules are installed in
any of I/O-module bays 7 through 10.
b. If an I/O module is installed in any I/O module bay 1 through 4, power
modules 1 and 2 are installed and working.
c. The device is allowed local power control through the management module
Web interface.
2. Reseat the device.
3. Remove the device and insert it into a known working bay of the same type.
a. If the device still will not power-on, replace it.
b. If the device powers-on in the other bay, call for service.
4. See “Solving undetermined problems” on page 118.
The green power-module input
LED is not lit.
1. Make sure that:
a. All power cords are connected to compatible power sources and the power
sources are working.
b. The shuttle release handles are in the closed position and the captive
thumbscrews are tightened.
2. Replace the power module with a power module that is known to work.
3. See “Solving undetermined problems” on page 118.
Chapter 5. Diagnostics
111