Dream Property DM800 HD PVR - Manual (Page 21)

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U s e r M a n u a l D r e a m b o x D M 8 0 0 H D P V R
Your Dreambox will now test if you TV can display
50Hz at the before set resolution. If your screen
stays black just wait 20 seconds and the picture will
be automatically returned to 60Hz.
To start the test press the OK-Button.
You can see the result on your screen.
Finally you can adjust the screen using some test
screens.
Select your desired option with the Navigation-
Buttons up and down. Press the OK-Button to
activate.
The video output should now be configured.