Sony VGC-RA820G - Manual (Page 59)

Connecting the Remote Sensor and Remote Sensor Control(s)
59
3 Press the remote sensor control onto the set-top box near the infrared port,
without covering the port.
✍
If the remote sensor control covers the infrared port on the set-top box, you cannot
use the remote control supplied with the set-top box.
Attaching the remote sensor control cable to a cable or satellite set-top box
Remote sensor
Infrared
port
Cable or satellite
set-top box
Remote sensor
control
(Do not cover)