DBPOWER RD-820 User Manual page 11

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4.3 Multimedia boot screen
Aſter 2-5 seconds, the multimedia screen will be displayed.
4.4 Focus & keystone correction
4.4.1 If the image is displayed as a trapezoid shape, you can adjust
it with the keystone correction function by pressing button 3.
This should normalize the display image.
SD
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