Audio: No signal is present at analog to digital converter in the fiber box
Topic
- How do I troubleshoot no signal present in the fiber box?
Environment
- SSR-100, SSR-200, SSR-300
- 500HD, 1500HD, 2000HD
Steps
- SSR-200 Make sure that the PFL Active light is off by unselecting any PFL buttons on the mixer channels.
- SSR-300
- Gen I Make sure that the Solo light is off by pressing the Solo Clear button.
- Gen II make sure that the CLEAR CUE light/button is off by pressing the CLEAR CUE button
- The SSR-100
- Gen I only has an Overload indicator for the output and no actual meter.
- Gen II has an output meter
- Gen III has an output meter for each output
- The Announcer's console meter only shows output.
- If there is no signal present at the mixer output meter, verify mixer setup and input source is working correctly
- If signal is present at the mixer output meter, with signal still playing:
- Verify the rack signal switch is turned on if present.
- Check the output AC voltage between the + and - pins, this should be between .5 Volt AC and 1 Volt AC. Adjust the mixer level accordingly:
- Test the signal level at the output of the rack:
- For the SSR-100
- Gen I, this is the MAIN OUT (B) jack.
- Gen II, this is the MAIN OUT (B) jack.
- Gen III, this is the MAIN OUTPUT (OUT 1) jack.
- For the SSR-200 this is the AUDIO OUT Jack.
- For the SSR-300
- Gen I, this can be done at the System Out card BOP1, ST OUT L in the back of the rack.
- Gen II, this can be done at the output of the mixer snake
- For the SSR-100
- If there is no voltage at the output of the rack, check the pins on the mixer output:
- If there is no output voltage at the mixer output, while the meters show signal out and the pfl/solo light is off(if present), replace the mixer.
- If there is output voltage at the mixer output, check the wiring in the rack and make sure all the connectors are firmly seated.
- Reconnect the harness cable to the mixer output.
- Test the signal level at the output of the rack:
- Connect the cable from the control rack output to the fiber box and confirm it is firmly seated.
- Check the AC voltage at the analog to digital converter.
- For the EMOD, check that the signal LEDs on input A show incoming signal:
- If not, take out the XLR and measure and see if voltage matches the voltage at the mixer.
- If there is voltage at the XLR but it doesn't show signal on the signal LEDs:
- Check that the input gain on the EMOD is turned up to approximately 1 o'clock.
- If there is still no signal on the signal LEDs, but there is voltage at the XLR, replace the EMOD.
- For the Biamp, measure the input and see if voltage matches the voltage at the mixer.
- For the EMOD, check that the signal LEDs on input A show incoming signal:
- Check if audio starts working when the analog backup switch is set to ANALOG/ON:
- If so, see Audio System Only Works With Analog Backup Turned On, Incorrect Fiber Box Wiring to check the fiber box switch wiring.
- Test the cable between the rack output and fiber box:
- If this cable tests bad, replace the cable.
- Check terminations and cabling in the fiber box and replace as needed.
KB ID: 000024867
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