IBM BladeCenter HT 8740, Problem Determination And Service Manual

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Fan pack 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
A fan pack is running at full
speed.
Note: A fan pack is installed on
the front of each power module.
1. Make sure that at least one management module is installed and it is active
and working.
2. Reseat the following components:
a. Power module (see “Removing a power module” on page 55)
b. Fan pack (see “Removing a fan pack” on page 58)
3. Install the fan pack on another power module to isolate the problem to the fan
pack or to the power module.
I/O module 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
An I/O module will not turn on.
1. Make sure that:
v
An I/O-module interposer is installed.
v
Power modules 3 and 4 are installed and working, if the I/O module is in any
of I/O-module bays 7 through 10.
v
Power modules 1 and 2 are installed and working, if the I/O module is in any
of I/O-module bays 1 through 4.
v At least one management module is installed and it is working.
2. Check the management-module event log for messages.
3. Check the management module for I/O POST error codes.
4. Make sure that the installed version of the management-module firmware
supports the I/O module.
5. Reseat the I/O-module interposer and the I/O module (see “Removing an I/O
module” on page 64).
6. Move the I/O module to a known working I/O bay in the BladeCenter HT unit or
in another BladeCenter HT unit.
a. If the I/O module does not work in that bay, replace it.
b. If the I/O module works in the known working bay, call for service.
Chapter 5. Diagnostics
105