Sharp AQUOS 4T-80CJ1U Operation Manual page 16

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Initial Installation (Continue)
CH Search (Channel search)
Channel auto search makes the TV look for all channels
viewable in the set area.
4 When "Air" is selected in Antenna setting:
Press / to select "Start", and then press ENTER.
When "Cable" is selected in Antenna setting:
Press / to select "Analog & Digital Search Start" to search
both analog and digital broadcasts, or to select "Analog
Search Start" to search only analog broadcasts, and then
press ENTER.
The Channel search will start automatically.
To exit the Channel search screen, select "Cancel", and
then press ENTER.
ENG 2-4