Motorola DCT3400 Series User Manual page 47

Problem
There are black
bars on all four
sides of the picture
The cable terminal
is making a
humming noise.
Possible Solution
This may occur on a 4:3 TV if the 4:3 OVERRIDE setting
is OFF. To set 4:3 SD programming to fill the screen,
depending on the capabilities of the TV, set
4:3 OVERRIDE to 480i or 480p.
This may occur on a 16:9 TV if the active video for an SD
broadcast is in letterbox format. To confirm, wait for a
commercial or look for a graphic, such as a network logo.
If the commercial fills the screen from top to bottom, or
the graphic appears below the active video, the program
is being letterboxed by the broadcaster. You can
minimize this by activating the zoom feature on the TV.
A broadcaster may include black bars on either side of a
widescreen broadcast. This is called a "hybrid" aspect
ratio and results in a black border surrounding the video
on a 4:3 TV. Because this is part of the broadcast, the
cable terminal cannot correct the video. You may be able
to minimize the border using the zoom feature on the TV.
The DCT3412 includes an integrated hard drive and a
fan for cooling. During normal operation, the DCT3412
emits a low humming noise, similar to a personal
computer. The noise varies in volume occasionally when
the speed of the internal fan adjusts to changes in the
temperature around the DCT3412. Please note the hard
drive will stay on even when the DCT3412 is turned off.
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DCT3400 Series User Guide