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Unidentified device next to 13A sockets

Harry Macdonald

I have been investigating a church organ that suddenly stopped working. This was rebuilt about 20 years ago using a data cable between the keyboard and the pipe section.

I have found two 13A sockets unused which are live and, just above them, two more which are not. All the electronic equipment is plugged in into the two which are not. Between the two is a box with the device small device in it

Can anyone identify it and advise its purpose. I am thinking some sort of surge protection but cannot identify any similar photos on google of find any identifying marks.

I'll post a photo when I can find out how. Copy/paste, drag n drop and insert don't work. It seems to want a URL but my photos don't have URLs.

Harry

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  • 0

    Let's apply a little logic. The data between the keyboard console and the rest of the organ has probably only 2 possibilities : Madi or Ethernet.

    If the electronic box requires the SSR (I am pretty sure it is one due to the general packaging) to be on to power it the communication must also have a control pair to the SSR, as in neither case is the data continuous. Ethernet uses 4 wires of 8 in a Cat5 (or whatever) cable and Madi the same. The test is to plug the "controlled" plugs into the live sockets and see what happens, the whole lot will probably burst into life. If so you need to trace the control wires which will go back to the console. These SSRs have opto-isolated control, but as Mike says a range of control voltages, but if the control is in the data cable, probably 5V. If you find the SSR is faulty give me a call, I have some stock!

  • 0 in reply to David Stone

    That should say Midi not Madi! Madi is multichannel digital audio, but the acronyms get a bit mixed up, there are now so many (hundreds).

  • 0 in reply to David Stone

    Join the the society for the removal of acronyms. Have Acronyms Terminally Extracted. (H.A.T.E.).

  • 0 in reply to David Stone

    Note that MIDI (at least the 5 Pin DIN version) does provide a steady 5V out to operate opto- couplers and so on, though on newer models it  can be 3V. also seen on stereo jack plugs with the data and the power on the tip and the ring, and 0V on the body

    It would make sense if they had used the 5V out from the organist console to provide a start-up enable the mains to the rest of it to give a single point switch on.
    (MIDI pinout here)

    The 3-30V type SSRs take about 10mA on the input side and can be turned on by a 9V battery and series resistor to test the SSR function in isolation (or if you are lucky the multi- meter on the ohms range might put out enough voltage to act as a test source and fire the thing, but I'd not like to bank on that.)

    Mike

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  • 0 in reply to David Stone

    Note that MIDI (at least the 5 Pin DIN version) does provide a steady 5V out to operate opto- couplers and so on, though on newer models it  can be 3V. also seen on stereo jack plugs with the data and the power on the tip and the ring, and 0V on the body

    It would make sense if they had used the 5V out from the organist console to provide a start-up enable the mains to the rest of it to give a single point switch on.
    (MIDI pinout here)

    The 3-30V type SSRs take about 10mA on the input side and can be turned on by a 9V battery and series resistor to test the SSR function in isolation (or if you are lucky the multi- meter on the ohms range might put out enough voltage to act as a test source and fire the thing, but I'd not like to bank on that.)

    Mike

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