Furuno FCV-1200LM - Manual (Page 62)

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3. Press the [!] or ["] key to close the color setting window.
4. Press the ["] key to select RED, GREEN or BLUE (level).
5. Press the [-] or [+] key to show the level setting window.
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Level setting window
6. Press the [-] or [+] key to select color strength.
The higher the number, the darker the color.
7. Press the [!] or ["] key to close the level setting window.
8. Do steps 4-7 to adjust other color..
9. To return to original color, select YES at DEFAULT SET.