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, Types 4255, 7945, and 7949 server,” on page 157 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 E LED
on the system board is lit.
1. Disconnect the server power cords.
2. Remove the following components:
v Optional PCI video graphics adapter power cable, if one is installed
(connector J154 on the system board)
v Optional PCI video graphics adapter, if one is installed
v PCI riser-card assembly in PCI connector 2 on the system board
v (Trained service technician only) Microprocessor 2
3. Restart the server. If the OVER SPEC and 12v channel LEDs are still lit,
(trained service technician only) replace the system board.
4. Reinstall the components listed in step 2 one at a time, in the order shown,
restarting the server each time. If the 12v channel E LED is lit, the component
that you just reinstalled is defective. Replace the defective component.
a. (Trained service technician only) Microprocessor 2
b. PCI riser-card assembly in PCI connector 2 on the system board
c. Optional PCI video graphics adapter, if one was installed
d. Power cable from optional PCI video graphics adapter to connector J154 on
the system board, if you removed one in step 2.
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the 240 V AUX failure
LED on the system board is lit.
1. Disconnect the server power cords.
2. Remove the following components:
v All PCI adapters and PCI riser-card assemblies
v SAS riser-card assembly
v Operator information panel assembly
v Optional two-port Ethernet adapter, if installed
3. Move switch 2 on switch block 4 (SW4) to the On position to force power on;
then, restart the server. If the OVER SPEC and the 240 V ac AUX failure LEDs
are still lit, (trained service technician only) replace the system board.
4. Reinstall the components listed in step 2, one at a time, in the order shown,
restarting the server each time. If the 240 V ac AUX failure LED is lit, the
component that you just reinstalled is defective. Replace the defective
component.
v Operator information panel assembly
v SAS riser-card assembly
v Optional two-port Ethernet adapter, if installed
v All PCI adapters and PCI riser-card assemblies
The server does not turn off.
1. Turn off the server by pressing the power-control button for 5 seconds.
2. Restart the server.
3. If the server fails POST and the power-control button does not work, disconnect
the power cord for 20 seconds; then, reconnect the power cord and restart the
server.
4. If the problem remains, suspect the system board.
58 IBM System x3650 M3 Types 4255, 7945, and 7949: Problem Determination and Service Guide
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