Motorola DCT6400 Series Installation Manual page 57

Problem
There are black bars
above and below the
picture.
There are black bars on
all four sides of the
picture.
There is a humming
noise.
Possible Solutions
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 set-top is
tuned to a 4:3 program.
Set the TV TYPE to 4:3 Pan-Scan. This enables the set-top 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 the TV manual for information about zooming
4:3 video).
This may occur on a 4:3 TV if the 4:3 OVERRIDE setting is OFF. To cause 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 wide screen 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 set-top cannot
correct the video. You may be able to minimize the border using the zoom feature
on the TV.
The DCT6400 series provides an internal fan to cool the integrated hard drive.
During normal operation, the fan emits a low humming noise, similar to a
personal computer. The volume varies occasionally when the fan speed adjusts
to changes in the temperature around the set-top. The hard drive remains on
even when the set-top is turned off.
Troubleshooting
DCT6400 Series Installation Manual
5-3