2–2 Maintenance and Service Guide
External component identification
Top components
Display components
✎
Your computer may look slightly different from the illustration in this section.
Item Component Description
(1) WWAN antennas (2)* Send and receive wireless signals to communicate with wireless wide-area
networks (WWAN).
(2) Internal microphones (1 or 2, varying
by computer model)†
Record sound.
✎
If there is a microphone icon next to each microphone opening,
your computer has internal microphones.
(3) WLAN antennas (2)* Send and receive wireless signals to communicate with wireless local area
networks (WLAN).
(4) Webcam light (select models only) On: The webcam is in use.
(5) Webcam (select models only) Records audio and video and captures still photographs.
(6) Internal display switch Turns off the display or initiates the Sleep state (Windows 7 and
Windows Vista) or Standby (Windows XP) if the display is closed while the
power is on.
*The antennas are not visible from the outside of the computer. For optimal transmission, keep the areas immediately around
the antennas free from obstructions.
†Only computers equipped with a webcam are equipped with 2 microphones. Computers not equipped with a webcam are
equipped with only one microphone.
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