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14 Hardware Maintenance Manual: xSeries 330
To view the LEDs on the system board:
1. Turn off the server and any peripheral devices.
2. Remove the cables.
3. Remove the server from the rack and place it on a flat, non-conductive surface.
4. Remove the server cover (see “Removing the cover” on page 44).
Note: Refer to “Working inside a server with power on” on page 42 for
instructions and precautions for working in the server with the power on.
5. Press and hold the Light Path Diagnostics (blue) button on the diagnostics panel.
The LEDs will illuminate while the switch is pressed.
Note: You can illuminate the LEDs for a maximum of two minutes. After that
time, the circuit that powers the LEDs is exhausted.
Diagnostics panel
The following illustration shows the LEDs on the diagnostics panel on the system
board. See Table 3 for information on identifying problems using these LEDs.
See “Information panel system error LED” on page 85 for appropriate action.
Table 3. Light Path Diagnostics.
LED Description
PS Power supply error
MEM Memory error occurred
TEMP System temperature exceeded maximum rating
CPU Microprocessor error
FAN Fan failed or operating slowly
VRM Voltage regulator module error
SP Error occurred on SP bus
PCI Error occurred on an adapter in PCI slot 1 or 2, or one of the PCI service
devices integrated on the system board.
PS
TEMP
FAN
SP
MEM
CPU
VRM
PCI
Light
Path