DirecTV D12 User Manual page 36

The Quick Menu
Also note: If you have Parental Controls set and temporarily unlocked, turning the receiver power
off will relock the box. If anyone tries to unlock restrictions using an invalid passcode, there's a time
delay that's added with each additional attempt to discourage them.
To change your passcode at any time:
1) Press MENU, SELECT Parental Controls, then Edit Settings.
2) Scroll down to Passcode and press SELECT.
3) Enter your old password, then enter a new one twice to confirm.
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Parental Controls