IBM System x3950, Problem Determination And Service Manual

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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, 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.
System-error log message Action
QA Cache 1.8V Power Good Fault
1. Reseat the microprocessor tray.
2. (Trained service technician only) Reseat the microprocessors.
3. Reseat the microprocessor VRMs, if any are present.
4. (Trained service technician only) Replace the microprocessor
tray.
QA Vcc PLL Power Good Fault
1. Reseat the microprocessor tray.
2. (Trained service technician only) Reseat the microprocessors.
3. Reseat the microprocessor VRMs, if any are present.
4. (Trained service technician only) Replace the microprocessor
tray.
QB Cache Power Good Fault
1. Reseat the microprocessor tray.
2. (Trained service technician only) Reseat the microprocessors.
3. Reseat the microprocessor VRMs, if any are present.
4. (Trained service technician only) Replace the microprocessor
tray.
QB Vcc PLL Power Good Fault
1. Reseat the microprocessor tray.
2. (Trained service technician only) Reseat the microprocessors.
3. Reseat the microprocessor VRMs, if any are present.
4. (Trained service technician only) Replace the microprocessor
tray.
Remote Login Successful. Login ID: Information only
Resetting system due to an unrecoverable error Check the following light path diagnostics LEDs for faults:
Note: Make sure you re-enable the memory in the
Configuration/Setup Utility program. See, “Memory problems” on
page 42.
1. Microprocessors
2. DIMMs
3. Memory card
4. Microprocessor tray
5. I/O board assembly
SCSI 1.8V Power Good Fault
1. Reseat the I/O board.
2. Replace the I/O board.
Single fan failure Replace any missing or failed fans or power supplies.
SMI reported a Machine Check on Memory Card
= %d
Note: Make sure you re-enable the memory in the
Configuration/Setup Utility program. See, “Memory problems” on
page 42.
1. Reseat the memory card.
2. Replace the memory card.
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IBM System x3950 Type 8878 and System x3950 E Type 8879: Problem Determination and Service Guide