IBM System x3950, Problem Determination And Service Manual

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v
A new error occurs, causing the system-error LED to be lit again.
Light path diagnostic LEDs
The following table describes the LEDs on the light path diagnostics panel and
suggested actions to correct the detected 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 8878 and 8879,” on page 109 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.
Lit light path
diagnostics LED with
the system-error or
system-information
LED also lit Description Action
All LEDs off (the
power LED is lit).
No action necessary.
OVERSPEC There is insufficient power to power
the system. The NON RED and
LOG LEDs might also be lit.
1. Add an optional power supply if only one power
supply is installed.
2. Use 220 V ac instead of 110 V ac.
3. Reseat the following components:
a. Power supply
b. (Trained service technician only) Power
backplane
4. Remove optional devices.
5. Replace the components listed in step 3 one at a
time, in the order shown, restarting the server each
time.
PS A power supply has failed or has
been removed; also see
“Power-supply LEDs” on page 58.
Note: In a redundant power
configuration, the dc power LED on
one power supply might be off.
1. Reinstall the removed power supply.
2. Check the individual power-supply LEDs to find the
failing power supply.
3. Reseat the following components:
a. Failing power supply
b. (Trained service technician only) Power
backplane
4. Replace the components listed in step 3 one at a
time, in the order shown, restarting the server each
time.
5. If a 12 V fault has occurred, ac power must be
removed before dc power can be restored.
LINK There is a fault in an SMP
Expansion Port or SMP Expansion
cable.
Note: The SMP Expansion Port link
LED on the failed port is off.
1. Check the SMP Expansion Port link LEDs to find
the failing port or cable.
2. Reseat the SMP Expansion cables.
3. Replace the SMP Expansion cables.
4. (Trained service technician only) Replace the
scalability cartridge assembly. If the scalability
cartridge assembly must be replaced, call for
service.
Chapter 2. Diagnostics
53