Lenovo ThinkServer RD120 Hardware Maintenance Manual page 175

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, ThinkServer RD120 Machine Types 6444, 6445, 6446, and 6447," on page 25
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
The OVER SPEC LED on the
Easy LED Diagnostics panel is
lit, and the power channel A
LED on the system board is lit.
The OVER SPEC LED on the
Easy LED Diagnostics panel is
lit, and the power channel B
LED on the system board is lit.
The OVER SPEC LED on the
Easy LED Diagnostics panel is
lit, and the power channel C
LED on the system board is lit.
Action
1. Remove the following components:
v (Trained service technician only) Microprocessor 1
v Fans 4, 6, 8, and 9
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 184.
3. Reinstall the components listed in step 1, one at a time, in the order shown,
restarting the server each time. If the power channel A LED is lit, the
component that you just reinstalled is defective. Replace the defective
component.
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 184.
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.
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 184.
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.
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Chapter 5. Diagnostics