To adjust the contrast, you have to hit the store button, then the arrow keys, which are the two little keys next to the caller id screen. you will then scroll thru the menu. it will eventually come to the contrast. then you use the arrow keys to move it to a darker shade. and hit store again, to store it.
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umm...usually if it is a desk top there will be buttons either on the side, front or back or even the top, one looks like a sun and another looks like a square thats normally half white and half black. they are your brightness and contrast...push either end of the buttons to adjust more bright or less bright, more contrast or less contrast.
AT&T Corded SpeakerphoneThe AT&T 1856 Corded Speakerphone with Digital Answering System offers the home-user peace of mind thanks to its power failure operation that doesn't require batteries. The Speakerphone features three one-touch memory buttons and a 9-number speed dial. The phone is caller ID and call waiting capable with a 50 name/number caller ID history, and features a visual message waiting and new call indicator. A large, LCD display with adjustable contrast controls allows for easy.
You should be able to adjust LCD contrast when phone is idle, just use the up/down arrow button to adjust it (don't go off-hook). If you have background music set, the above procedure will adjust the music volume instead. You can turn Background music on and off by pressing <Feature>,2,6 when your phone is idle. Alternatively, you may press <Speaker> 6,0,2 and then use the UP/Down arrow key to adjust LCD contrast.