LG RD-JT30 Service Manual page 104

2.3.15-16 Zoom Up/Down Key
Zoom: 25 steps
Zooming up/down by Zoom Up/Down KEY
Scrolling by Joystick
Zoom OSD Display Time : 5 seconds.
2.3.18 JOYSTICK
Mouse 16 directions, Volume + / -
Moves cursor or adjusts selected item value when OSD menu is on.
Scrolls the screen when zoom function is on.
Moves mouse pointer when it used as a mouse key.
30