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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.
LED status
Power module:
Error LED lit
(Amber)
Fan module:
Error LED lit
(Amber)
Multiplexer expansion module:
Fault LED lit
(Amber)
Multiplexer expansion module:
One FRR (FRU ready for
removal) LED lit
(Blue)
Multiplexer expansion module:
Two FRR (FRU ready for
removal) LEDs lit
(Blue)
116
BladeCenter HT Type 8740 and 8750: Problem Determination and Service Guide
Description
The power module has failed.
The fan module has failed.
There is an error with the
multiplexer expansion module.
You can remove the multiplexer
expansion module without
interrupting any connections
between the management
module and the blade servers.
The module is not active while
the FRR LED is lit.
Under normal conditions, the
blue FRR LED on the
multiplexer expansion module
that is associated with the
active management module is
off, and the FRR LED on the
multiplexer expansion module
that is associated with the
standby management module
is lit. If they are both lit, an I2C
bus error has occurred
between the active
management module and the
associated multiplexer
expansion module, or a
problem with the active
management module has
occurred.
Action
Make sure that:
1. All power cords are plugged into compatible
power sources and that the power sources are
working.
2. The shuttle release handles are in the closed
position and the captive thumbscrews are
tightened.
Replace the power module with a power module
that is known to work. If the problem remains, go
to "Solving undetermined problems" on page 118.
Replace the fan module with a fan module that is
known to work.
1. Reseat the multiplexer expansion module (see
"Removing a multiplexer expansion module" on
page 79.)
Note: The multiplexer expansion module
takes several minutes to initialize.
2. Replace the multiplexer expansion module.
Remove the multiplexer expansion module.
1. Force a failover to the standby management
module by removing the active management
module from the BladeCenter unit. If there is
only one management module, move it to the
alternative management-module bay.
2. If the blue LEDs on both multiplexer expansion
modules are still lit after 60 seconds, reverse
the locations of the two multiplexer expansion
modules.
3. If the blue LEDs on both multiplexer expansion
modules are still lit after 60 seconds, reverse
the locations of the management modules. If
there is only one management module, move it
to the other management-module bay.
4. If the problem remains, possibly an I2C bus
failure has occurred on the midplane. Call for
service.
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