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 7979 and 1914 server,” on page 79 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.
Symptom Action
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the power channel B
LED on the system board is lit.
1. Remove the following components:
v IDE CD/DVD cable
v Fans 1, 2, 3 and 5
v (Trained service technician only) Microprocessor 2 and the VRM, together
2.
Restart the server. If the OVER SPEC and power channel LEDs are still lit, see
the actions for +12 v critical overvoltage fault in “System event/error log
messages” on page 68.
3. Test the IDE CD/DVD cable and drive:
a. Reinstall the IDE CD/DVD cable; then, restart the server.
b. If the OVER SPEC and power channel LEDs are still off, replace the
CD-RW/DVD drive.
4.
Reinstall the remaining components listed in step 1, one at a time, in the order
shown, restarting the server each time. If the power channel B LED is lit, the
component that you just reinstalled is defective. Replace the defective
component.
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the power channel C
LED on the system board is lit.
1. Remove the following components:
v Tape drive power cable
v DIMMs
v ServeRAID SAS controller
2.
Restart the server. If the OVER SPEC and power channel LEDs are still lit, see
the actions for +12 v critical overvoltage fault in “System event/error log
messages” on page 68.
3. Test the tape drive and cable:
a. Reinstall the tape drive power cable; then, restart the server.
b. If the OVER SPEC and power channel LEDs are still off, replace the tape
drive.
4.
Restart the server. If the OVER SPEC and power channel LEDs are off,
reinstall the DIMMs, one pair at a time, restarting the server each time. If the
power channel C LED is lit, the pair of DIMMs that you just reinstalled is
defective. Replace the defective DIMMs.
5. Reinstall the ServeRAID SAS controller and restart the server. If the OVER
SPEC and power channel LEDs are off, replace the ServeRAID SAS controller.
The OVER SPEC LED on the
light path diagnostics panel is
lit, and the power channel D
LED on the system board is lit.
1. Remove all PCI adapters (the low-profile PCI Express adapters in PCI slots 3
and 4, and the adapters on the PCI riser card in PCI slots 1 and 2).
2. Restart the server. If the OVER SPEC and power channel LEDs are still lit, see
the actions for +12 v critical overvoltage fault in “System event/error log
messages” on page 68.
3. Reinstall the adapters, one at a time, restarting the server each time. If the
power channel D LED is lit, the adapter that you just reinstalled is defective.
Replace the defective adapter.
46 IBM System x3650 Type 7979 and 1914: Problem Determination and Service Guide
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