IBM System x3550 M3 Type 4254 Problem Determination And Service Guide

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 4, “Parts listing, System x3550 M3 Types 4254 and 7944,” on page 159 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.
v Go to the IBM support Web site at http://www.ibm.com/systems/support/ to check for technical
information, hints, tips, and new device drivers or to submit a request for information.
Symptom Action
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the 12v channel A LED
on the system board is lit.
1. Turn off the server and disconnect the power from the server.
2. Remove the optical drive, fans, hard disk drives, and hard disk drive backplane.
3. Restart the server to see whether the problem remains.
4. Reinstall each device that you removed in step 2 one at a time, starting the
server each time, to isolate the failing device.
5. Replace any failing device.
6. (Trained service technician only) Replace the system board.
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the 12v channel B LED
on the system board is lit.
1. Turn off the server and disconnect the power from the server.
2. Remove the PCI riser card in connector 1, all DIMMs, and the microprocessor
in socket 2.
3. Restart the server to see whether the problem remains.
4. Reinstall each device that you removed in step 2 one at a time, starting the
server each time, to isolate the failing device.
5. Replace any failing device.
6. (Trained service technician only) Replace the system board.
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the 12v channel C LED
on the system board is lit.
1. Turn off the server and disconnect the power from the server.
2. Remove the SAS/SATA RAID riser card, DIMMs in connectors 1 through 9, and
the microprocessor in socket 1.
Note: The server will not power-on when the microprocessor in socket 1 or 2
is not installed in the server. (Trained service technician only) Toggle the switch
block (SW4), bit 3 to allow the server to power-on. See “System-board switches
and jumpers” on page 18 for the location of the SW4 switch block on the
system board.
3. Restart the server to see whether the problem remains.
4. Reinstall each device that you removed in step 2 one at a time, starting the
server each time, to isolate the failing device.
5. Replace any failing device.
6. (Trained service technician only) Replace the system board.
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the 12v channel D LED
on the system board is lit.
1. Turn off the server and disconnect the power from the server.
2. (Trained service technician only) Remove the microprocessor in socket 1.
Note: The server will not power-on when the microprocessor in socket 1 or 2
is not installed in the server. (Trained service technician only) Toggle the switch
block (SW4), bit 3 to allow the server to power-on. See “System-board switches
and jumpers” on page 18 for the location of the SW4 switch block on the
system board.
3. Restart the server to see whether the problem remains.
4. (Trained service technician only) Reinstall the microprocessor in socket 1 and
restart the server.
5. Replace any failing device.
6. (Trained service technician only) Replace the system board.
Chapter 3. Diagnostics 97

IBM System x3550 M3 Type 4254 Specifications

General

Brand	IBM
Model	System x3550 M3 Type 4254
Category	Server
Language	English