How do I fault-find a panel with no loudspeaker audio?

Owned by Graham Balchin
May 31, 2018

If a panel connected to the matrix has functioning keys and displays but when the key is selected to listen and a solid yellow tally is shown but no audio is heard at the loudspeaker or headset ear try the following tests to fault-find the possible cause.


If it is connected to a Gemini matrix try the tests 1 to 3. For a Messenger, skip test 2.

Step-by-step guide


  1. Check the panel volume control is not turned down. If the panel cut switch is assigned to cut the panel loudspeaker, check the panel cut switch is not enabled and the cut indicator is not illuminated.
  2. On the Gemini front panel, select Tools > Monitor.
  3. When in the monitor menu make sure the ‘Outputs’ option is showing in the bottom right corner. Now select the port number the panel is connected to and then choose ‘Levels’ The level meter is now displaying the audio from the matrix to the panel.

  5. If another panel now speaks to this panel, it should show around 0dB level on the meter whilst the caller is speaking.

  7. If audio is seen on the meter or the host is an MIU move to test 3. If no audio is on the meter then check the configuration; the crosspoint could be set to a low gain level or dimming may be being applied.

  8. Swap this panel with a known working panel, use the same cable between the panel and matrix. Does the fault follow the panel or is the known working panel now showing the same defect when plugged to the same matrix port? If the new panel loudspeaker audio now works this would suggest a panel fault- go to test 10. If the new panel does not work this would suggest a cable fault- go to test 9 to confirm.
  9. Swap the cables on the AEB port connections on the rear of the matrix. Take another cable from a matrix AEB port with a known working cable and known working panel connected and plug this into the AEB port with the no audio fault.
  10. Take an RJ45 patch lead and cut off one connector around 15 cm from the end. Then strip back the wires and make two soldered connections.


    1. Join the Blue wire to the Brown wire.
    2. Join the Blue/White wire to the Brown/White wire.


    With this you now have a short RJ45 cable with two loopback connections. If you plug this cable into the ‘Matrix’ connector on the panel this will now route the audio from the panel’s mic to the panel’s speaker. If no audio is heard, then this would indicate a defect with the panel, if audio is present, the fault is either matrix related or the cable between the panel and the matrix.




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