IBM System x3750 M4 Type 8722 Installation And Service Manual page 179

Table 22. Light path diagnostics panel LEDs (continued)
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", to determine which components are customer replaceable units (CRU) and
which components are field replaceable units (FRU).
v If a action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
LED Description
TEMP The system temperature has
exceeded a threshold level. A
failing fan can cause the
TEMP LED to be lit.
FAN A fan has failed, is operating
too slowly, or has been
removed. The TEMP LED
might also be lit.
BOARD An error has occurred on the
system board.
HDD A hard disk drive has failed
or is missing.
Action
1. Make sure that the air vents are not blocked.
2. Make sure that all fans are seated correctly.
3. Determine whether a fan has failed (indicated by a lit LED on the
fan). If it has, replace the fan.
4. Make sure that the heat sink is seated correctly.
5. Make sure that the room temperature is not too high. See "Server
features and specifications" on page 6 and "Installation
guidelines" on page 33 for the server temperature information.
1. Check the LEDs on the hot-swap fan.
2. Reseat the failing fan, which is indicated by a lit LED on the fan.
3. Replace the failing fan.
1. Check the LEDs on the server.
2. Check the LEDs on the system board to identify the component
that caused the error. The BOARD LED can be lit due to many
reasons, for example:
v RAID cache card
v Battery
v Failed system board
3. Check the IMM event log for information about the error.
4. Replace any failed or missing replacement components, such as
the battery.
5. (Trained service technician only) replace the server system board.
1. Check the LEDs on the hard disk drives for the drive with a lit
status LED and reseat the hard disk drive.
2. Make sure that the cables are correctly connected to the hard disk
drive backplane.
3. For more information, see "Hard disk drive problems" on page
175.
4. If the error remains, replace the following components in the
order listed, restarting the server after each:
a. Replace the hard disk drive.
b. Replace the hard disk drive backplane.
5. If the problem remains, go to http://www.ibm.com/systems/
support/supportsite.wss/docdisplay?brandind=5000008
&lndocid=SERV-CALL.
Chapter 4. Troubleshooting
163