Samsung PN51F5300BFXZA - Manual (Page 120)

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Signal Information : (digital channels only) The reception quality of over-
the-air HD channels is either perfect or the channels are unavailable. Signal
Information displays HD channel signal strength so you can adjust your
antenna to increase signal strength and receive HD channels.
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Reset : Reset all settings to the factory defaults except network settings.
N The PIN input screen appears before the setup screen.
N Enter your 4-digit PIN or the default PIN (0000) if you have not set your
own PIN. You can change the PIN using the
Change PIN option. (MENU
→ System → Change PIN → ENTERE)