Speco Technologies SIPT5 - Manual (Page 60)

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AUTO GAIN CONTROL (AGC)
AGC is to get bright picture. Higher GAIN level, getting brighter
screen. However, you can get noise increase.
a. Press the SET button to display the SETUP menu and move
arrow indicator to ‘AGC’ using the UP or DOWN button.
b. SET ‘AGC’ to the desired mode using the LEFT or RIGHT
button.
OFF / ON