NF DP420LS Instruction Manual page 202

3. In the [Contrast] item, set the contrast value.
4. Close the window.
-------- Notes ------------------------------------------------------------------------------------------------------------
 The L2 and L3 cabinets in a polyphase system accept the Shortcut operation
for this function. In this case, if other window is being displayed, that window closes and the
window for adjusting LCD opens only on the cabinet on which you performed the operation.
To open the previous window after adjusting LCD, close the window displayed in the L1
cabinet and reopen it.
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DP420LS/DP480LS
4.26 Changing the Background Color and the Contrast of the Screen
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