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Status LEDs and Buttons
Internal Diagnostic LEDs
The server is equipped with a supercap voltage source that can activate internal component fault LEDs
up to 30 minutes after AC power is removed. The server has internal fault LEDs for CPUs, DIMMs, fan
modules, SD cards, the RTC battery, and the mLOM card.
To use these LEDs to identify a failed component, press the front or rear Unit Identification button (see
Figure 3-1
See
Figure 3-3
1
2
3
Table 3-4
LED Name
Internal diagnostic LEDs (all)
Cisco UCS C240 M4 Server Installation and Service Guide
3-8
or
Figure
3-2) with AC power removed. An LED lights amber to indicate a faulty component.
Figure 3-3
for the locations of these internal LEDs.
Internal Diagnostic LED Locations
Fan module fault LEDs (one on each fan
module)
DIMM fault LEDs (one directly in front of
each DIMM socket on the motherboard)
CPU fault LEDs
Internal Diagnostic LEDs, Definition of States
1
2
3
4
SD card fault LEDs
5
RTC battery fault LED (under PCIe riser 1)
6
mLOM card fault LED (under PCIe riser 1)
State
Off—Component is functioning normally.
•
Amber—Component has a fault.
•
Chapter 3
Maintaining the Server
4
5
6
Riser 2
Riser 1
OL-32474-01
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