Arris DCX3510-M User Manual page 39

Troubleshooting
Problem
There is no audio from
the center and/or
surround speakers of a
home theater receiver
connected to the DCX
set-top
There is no video on the
TV screen
No graphics or program
guides appear on the TV
screen
No closed captions
display
There are black bars to
the right and left of the
picture
There are black bars
above and below the
picture
with OCAP Software DCX3510-M • User Guide
365-095-25385-x.1
Possible Solution
• Not all programs feature full Dolby Digital [5.1] or Dolby Digital Plus [7.1] surround
sound. In some cases, the programs may only contain left and right stereo audio.
• Verify that the HDMI or optical S/PDIF cable is firmly connected to the DCX set-top
and the home theater receiver.
• Verify that the home theater receiver is set to a surround sound audio mode
(Dolby Pro Logic®, Dolby Pro Logic II®, Dolby Pro Logic IIx®).
• Verify that the receiver is properly configured to work with all connected speakers.
• Verify that the TV is powered on and set to the appropriate input source for the
DCX set-top.
• Verify that the DCX set-top is powered on and tuned to an authorized cable
channel.
• Verify that all video cables between the DCX set-top and the TV are firmly
connected.
• Verify that the coaxial cable feed is firmly connected to the DCX set-top and the
wall jack.
• If the DCX set-top video output is connected to a home theater unit, verify that
the home theater unit is powered on and set to the appropriate input source.
• If the DCX set-top video output is connected to a TV through an HDMI connection,
power off the TV and then power off the DCX set-top. Wait one second and then
power on the devices.
Not all HDTVs can display every output format (1080i, 720p, 480p, or 480i) available
on the DCX set-top. Refer to your TV manufacturer's documentation to determine
the compatible format for your TV and set the corresponding output format for the
set-top on the IPG.
If you use the IEEE-1394 connection, on-screen graphics, including closed captions
and program guides, are not displayed by the DCX set-top. On-screen graphics and
captions may still be overlaid by your TV, if enabled. Use HDMI or component video
instead of IEEE-1394.
• Verify that closed captions are enabled using the IPG menu.
• If you are using the RF out connector, verify that closed captions are enabled on
the TV.
Note: Closed captioning may not be available on the current program.
Wide screen TVs display 4:3 programs in this format unless set to Stretch.
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.
Some SD programs are broadcast in the letterbox format with black bars above and
below the picture. Some widescreen 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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