ABUS TV8682 - Manual (Page 15)

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4.4. TV -> Cable / SAT selector switch
Press this button to select whether you want to convert the video signal to a UHF channel for channels 21-69 or for the cable and SAT channels
65-135. In mode 1 (TV), pressing “01” shows the channel display and then channels 21-69.
In mode 2 (cable and SAT), pressing “02” shows the channel display and then channels 58-107.
4.5. Regulator for the video input level
The level for the video input signal is set to a standard value at the factory. Change this setting only if absolutely necessary. Changing the video
level setting changes the brightness value of the TV picture.
4.6. Regulator for the audio input level
The level for the audio input signal is set to a standard value at the factory. Change this setting only if absolutely necessary. Changing the audio
level setting changes the acoustic volume of the TV sound.