Lenovo ThinkPad T420 Hardware Maintenance Manual - Page 60
Table 7. Status indicators, Indicator, Meaning, Orange, Green - microphone
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5 6 11 10 Table 7. Status indicators Indicator 1 Speaker mute Meaning 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 Green: The Bluetooth wireless feature is on, and the radio link is ready R 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. 54 ThinkPad T420 and T420i Hardware Maintenance Manual