Sangean DDR-7 Manual page 26

Contrast
The contrast of the display can be adjusted.
1.
With your radio switched on, press and hold the Menu button to
access the menu for the current mode.
2.
Rotate the Tuning control knob to select "System Setup". Press the
Select button to enter the system settings menu.
3.
Rotate the Tuning control knob to select "Contrast". Press the Select
button to enter the setting.
4.
Rotate the Tuning control knob to adjust the contrast. The contrast
level indication on the screen will change at the same time. When you
find the setting that gives the best legibility for the location in which the
radio is used, press the Select button to confirm the setting.
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