To adjust the contrast of the display.
For single line display handsets.
Press the 'MODE' button until 'CONT' or 'CONTRAST' is displayed.
Turn the Jog Dial (big round dial) clockwise until desired setting is selected
For 3-line or large display handsets.
Press the 'SHIFT' button until 'CONT RINGOFF BGM' is displayed.
Press the button directly underneath 'CONT' and
Turn the Jog Dial (big round dial) clockwise until desired setting is selected
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