© 2016 AVAYA
15-601040 Issue 10.b.-
14:43, 26 July 2016
(adjusting_the_screen_contrast.htm)
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Last Modified: 18/07/2016
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“菜单”(MENU) 按钮。 
向上和向下 
箭头按键找到选项“对比度”(Contrast)。
向左和向右 
箭头按键可以视需要调整亮度。