CDA vc800 Installation, Use And Maintenance Manual page 42

Press the
the buzzer.
Press the
Adjusting Contrast
To increase or reduce the contrast of the display, proceed as follows:
Press the Settings Menu button (B2) to enter the menu then press the
"+" & "-" buttons (B7) and (B8) to select the "CONTRAST" function.
Press the "ok" button (B9) to confirm.
Press the "+" & "-" buttons (B7) and (B8) until the required display
contrast is reached. The progressive bar indicates the level of
contrast selected.
Press the "ok" button (B9) to confirm.
Press the
menu.
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button (B6) to disable or the "ok" button (B9) to enable
button (B6) to exit the menu.
button (B6) to exit the function or twice to exit the