Sony PCS-1600 Operating Instructions Manual page 63

If the frame is repeatedly extended to the full screen
The camera does not recognize the subject. Repeat steps 2 to 4
again.
If the lamp at the side of the lens lights up
The camera is not capturing the memorized subject correctly.
In this case, perform the pan/tilt operation so that the subject
comes into the screen, or have the subject memorized onto the
camera again.
Note
When the frame does not track the subject, repeat steps 2 and 4
until the frame starts tracking the subject while adjusting the
lighting and the portion of the subject so that the color and
brightness of the subject is optimized.
Chapter 2 Basic Operation During a Meeting
63