Initial Technology DTV-172 - Manual (Page 19)

Press TV MENU to bring up the TV menu screen.
Press / to select "Settings" and press to enter into the items below ''Settings''.
NOTE: Only when in TV status, there is "TV Tuner"option below "Settings".
Make sure press TV MENU to exit TV menu screen before other operatings.
MENU ADJUSTMENT
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TV TUNER ADJUSTMENT
TV Source
This will help you to select the TV's signal source.
1. Press TV MENU to bring up the TV menu screen.
2. Press / to select "Settings" and press to select "TV Tuner".
3. Press to enter "TV Tuner" menu.