Sony KP-51WS510 Service Manual page 241

Using the Menus
Using Custom
Rating Options
66
If you want to select the ratings to be blocked from Custom, follow the
procedure below.
1
Perform the steps 1 to 8 in "To select the rating" on page 63 to display
the Parental Lock options.
2
Move the joystick up or down to select "Custom," and press
3
Make sure that "Movie Ratings" is selected, and press
4
Move the joystick up or down to select the rating to be blocked, and
press .
The indicator automatically appears beside the selected rating and all
"higher" ratings, indicating that the programs that match the ratings will
be blocked.
To unblock a rating, select it by moving the joystick up or down, then
press . The indicator
unblocked.
changes into "-" and all "lower" ratings are
.
.