Sony TTR1 - Manual (Page 41)

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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. If you have entered the correct lock
code, the channel will begin playing .
Once you have unlocked one channel, all locked
channels become unlocked and will remain
unlocked until you turn the Radio Off . The next
time you turn the Radio On, all channels will be
locked .
Parental lock is off
Category Tune