Lenovo T420 - Manual (Page 56)

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Table 7. Status indicators
Indicator Meaning
1 Speaker mute
Orange:
The speaker is on mute. To set the speakers on mute or unmute,
press the speaker mute button.
2 Microphone mute
Orange:
The microphone is on mute. None of the recording devices is
available while the microphone mute is on by default.
3 Wireless LAN, Wireless WAN,
or WiMAX status
Green:
The wireless LAN feature (the IEEE 802.11 b/g standard, 802.11
a/b/g, or 802.11n), wireless WAN feature, or WiMax feature is
on, and the radio link is ready for use.
Data is being transmitted.
4 Bluetooth wireless or Wireless
USB status
R
Green:
The Bluetooth wireless feature is on, and the radio link is ready
for use.
Data is being transmitted.
5 Device access
Green:
Data is being read from or written to the hard disk drive, the
diskette drive, or the drive in the Serial Ultrabay Enhanced
device. When this indicator is on, do not put the computer into
sleep (standby) mode or turn off the computer.
Note: Do not move the system while the green device access light is on.
Sudden physical shock could cause drive errors.
50 ThinkPad T420 and T420i Hardware Maintenance Manual