Audio Switching Board Troubleshooting - AMX DGX1600-ENC Hardware Reference Manual

Audio Switching Board Troubleshooting

If the audio is not present or is not at the expected destination:
You may need to re-wire to a different connector (see the section on "Audio Routing Capability" on page 150).
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Check to be sure all the "Rules for System Setup" on page 142 have been followed.
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Verify that the Audio Switching Board is seated correctly by removing and re-seating (see page 236) and then test/check
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the board's functionality again.
If audio signal output format (2 channel L-PCM) is different than the required output format:
You may route one input to any or all outputs as Dolby TrueHD, Dolby Digital, DTS-HD Master Audio, DTS, or 2 CH through
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8 CH L-PCM format by selecting that input as the Downmix Input (see page 166).
Or
You may change the output format by disabling the extraction/insertion of the signal by Audio Switching Boards and allow
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the input signal to be passed through the system as embedded audio on a video signal (see page 178).
If audio buzzes when connected to a balanced audio input device:
Wire the Audio Switching Board (ASB) connector as follows (see wiring example on the right in FIG. 88 on page 148):
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If downmixed audio is not present or is intermittent with good video:
A signal containing both video and audio must have space for both signal portions. The audio signal portion lies in the
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blanked portion of the video signal. High Bit Rate Audio (HBRA) requires a larger than normal space in the blanked area of
the signal. Video formats with reduced blanking normally provide enough space for audio signals. In a signal that combines
a video format with reduced blanking and HBRA, the HBRA signal is truncated and can present as either no audio or as
problematic audio (static, clicking, absent, etc.). While Enova DGX hardware supports both HBRA and reduced blanking
video formats, these formats do not necessarily work with one another.
To resolve the issue, change either the audio format to non-HBRA or change the video format to a format that does not use
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reduced blanking.
If the Audio Switching Board defaults to "Embedded" rather than "Switched" audio:
Audio Switching Boards default to Switched audio but, if the system was upgraded from Enova DGX 8/16/32/64 to 100
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Series and then power cycled prior to insertion of ASB boards, the system may not recognize the correct default state.
To resolve this issue, open the System Configuration interface and toggle the Audio Routing to its correct setting (see
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page 173).
Hardware Reference Manual – Enova DGX 100 Series Digital Media Switchers
ASB L+ to device L+
ASB R+ to device R+
ASB ground not connected
ASB R- to device R-
Jumper from ASB R- to ASB L-
Enova DGX Audio Switching Boards
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