Source LockSource Lock is opted to hinder external input modes, such as AV, S -Video and VGA. Press CH+/- button to selectthe option, and press VOL+/- button to display Source Lock menu.Source LockAV1 OffS-Video OffAV2 OffYPbPr/YCbCr OffVGA OffDVI OffPress CH+/- button to select desired option. Press VOL+/- button to set up themode of Source Lock. If some Source Lock is set on, the mode will be enteredand the screen will display blue background with the mute mode activatedand Lock. In lock on mode, when screen is blank, icon Lock will be alwaysdisplayed on the screen. If lock mode is to be verified, enter Source Lock submenu and set relative mode off or select Unlock mode in the Preset Prog.Menu.Child LockMax VolumePress CH+/- button to select Max Volume. Press VOL+/- button for adjustment between 0 100. If a certain value is set,when volume is being adjusted, the sound value cannot exceed maximum volume value. If current volume is overMax Volume, when Lock Set menu is set, current volume will become set maximum volume. If current volume isbelow maximum volume, customer set volume will stay unchanged.UnlockPress CH+/- button to select Unlock mode.Press VOL+/- button to unlock all set modes, setting all lock options to off, and the maximum volume returns to 100.Press CH+/- button to select Child Lock. Press VOL+/- button to set On or Off mode. If lock on mode is set,Child Lock is inactivated automatically. In such case, If buttons on TV are pressed, the screen will display Child Lock,which can be erased by press of EXIT button. 5 seconds later after the latest press, the screen display will disappearautomatically. The Child Lock mode can be resumed by entering Lock Set menu to set Child Lock off or active Unlock.Prog. Num is opted for setting up preset channel. Press CH+/- button to select Prog Num. Press VOL+/- button, to selectchannel number.(The item is not available except TV signal.)Prog.Num