3-2
Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter3 Maintainin g the Server
Status LEDs and Buttons
Status LEDs and Buttons
This section describes the location and meaning of LEDs and buttons and includes the following topics:
•Front-Panel LEDs, page 3-2
•Rear-Panel LEDs and Buttons, page 3-4
•Internal Diagnostic LEDs, page 3-7

Front-Panel LEDs

Figure 3-1 shows the front-panel LEDs. Table3-1 on page 3-3 defines the front-panel LED states.
Figure3-1 Front-Panel LEDs
1Hard drive fault LED 6Fan status LED
2Hard drive activity LED 7Temperature status LED
3Power button and Power status LED 8Power supply status LED
4Identification button and LED 9Network link activity LED
5System status LED
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HDD 1
HDD 2
HDD 3
HDD 4
HDD 5
HDD 6
HDD 7
HDD 8
HDD 9
HDD 10
HDD 11
HDD 12
HDD 13
HDD 14
HDD 15
HDD 16
1 2
3
4
5
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