Haier L32R1, L40R1, L42R1 Owner's Manual page 31

Lock Setup
Preset Channel
Preset Channel is opted for setting up preset channel.
Press CH+/- button to select preset Channel. Press VOL+/- button, to select channel
number.(The item is not available except TV signal.)
Child Lock
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 in activated automatically. In such case, if Child Lock button (button on the
television) is pressed, the screen will display Child Lock, which can be
erased by press of MENU button. 5 seconds later after the latest press, the
screen display will disappear automatically. The Child Lock mode can be
resumed by entering Lock Set menu, set Child Lock On or Off.
Max Volume
Press CH+/- button to select Max Volume. Press VOL+/- button for
adjustment between 0
adjusted, the sound value can not exceed maximum volume value. If current
volume is over Max Volume, when Lock Set menu is set, current volume will
become set maximum volume. If current volume is below maximum volume,
customer set volume will stay unchanged.
UnLock
Press 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.
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100. If a certain value is set, when volume is being