Motorola DCT3400 Series User Manual page 40

Problem
There are black
bars to the right
and left of the
picture
There are black
bars above and
below the picture
This Manual: http://www.manuallib.com/file/2587933
Possible Solution
Wide screen TVs display 4:3 programs in this format
unless set to Stretch. Turn on the 4:3 OVERRIDE feature
in the User Settings menu. This enables most wide
screen TVs to stretch the video to fill the screen (see
your TV manual for information about stretching 4:3
video).
If the cable terminal is connected to a wide screen TV,
verify that the TV TYPE is set to 16:9 in the User
Settings menu.
Many HD programs are broadcast in pillar-box format
with black bars to the left and right of the picture. These
programs are broadcast in 16:9 HD formats even though
the video is not 16:9.
All 4:3 HDTVs display HD programs in letterbox format
(black bars above and below the picture) because of the
shape of the display screen.
Turn on the 4:3 OVERRIDE feature in the User Settings
menu. This enables most standard screen TVs to display
a full screen picture when the cable terminal is tuned to a
4:3 program.
Set the TV TYPE to 4:3 Pan-Scan. This enables the
cable terminal to remove the black bars above and below
the picture when possible.
Some SD programs are broadcast in the letterbox format
with black bars above and below the picture. Some wide
screens TVs offer a zoom feature that may be able to
remove the black bars (see your TV manual for
information about zooming 4:3 video).
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DCT3400 User Guide