Press once to scan 2 channels per second. Press for more than 1 /2 second to scan 12 channels per second. Press the Scan key again or any other key to stop. 5. Channel Up/Down Keys - Press once to change a channel. Press more than 1 /2 second to change 8 channels per second. Release key to stop. 6. V/H Polarity Key - Press to change from horizontal to vertical or vertical to horizontal polarity. 7. Skew +/- - Adjust the skew pulse to fine-tune the television picture. Press + or — until you ge