Sony TTR1 - Manual (Page 39)

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To lock or unlock channels:
1. Press and hold the TUNE knob .
2. Turn the TUNE knob to scroll through the list and highlight Lock
channels . Press the TUNE knob .
3. If parental control is On (locked), you will be prompted to enter
your 4-digit code, otherwise skip to step 4 . Use the 0-9 number
buttons on the Radio or Remote
Control to enter the lock code . If you
make a mistake, turn the TUNE knob
to highlight BKSP and press the
TUNE knob to erase the character
.
When you have selected all 4 digits of
your code, turn the TUNE knob to
highlight OK and press the TUNE knob .
4. When you have successfully unlocked parental control, a list of all
the channels will be displayed . Turn
the TUNE knob to scroll through the
list and highlight a channel that you
wish to lock . Press the TUNE knob
to lock the channel . An L will be
displayed to the right of the channel
name indicating that the channel is
locked .
Enter lock code
BKSP
OK
CANCEL
100-Howard 100
101-Howard 101
102-SIRIUS XM Stars
103-Blue Collar Radio
104-Raw Dog Comedy
L
L
L
Lock channels