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On the ZR-76 keyboard, no output on main or aux output jacks ok on headphone

On the ZR-76 keyboard, we have no output on the main or aux output jacks. It is normal on the headphone jacks.

We need a schematic of the output pcb to troubleshoot the loss of signals.

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  • culldeda Jan 12, 2009

    No outputs on main and aux outs, headphones okay.

  • Anonymous Mar 13, 2014

    Sound died during session. While trying to connect external speaker to test it I discovered a jumper from headphone jack to external speaker jack produces sound. Go figure. Local electronics tech could not find anything without schematic very confusing. HELP.

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Ensoniq zr-76 no output signal on the main and aux, but i have output on headphone jack?

Posted on Jan 17, 2010

  • stane_sotlar
    stane_sotlar Sep 24, 2012

    HELLO;I HAVE THE SAME ISSUE WITH ENSONIQ MR 76 AND FREEZES OFTEN TOO,CAN ANYBODY HELP ME ? STANLEY

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Why does my lowrey organ not make a sound after I have switched it on?


This is a generic answer for this kind of question.
When there is no sound
Check the obvious.
Is there a light on the organ indicating it is on?
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Sometimes a sustain pedal plugged into a volume pedal socket will mute the output, check this.
Headphones out, most headphones will turn speakers off, sometimes the headphone switch can be dodgy, work the headphone plug in an out a few times
There maybe a switch that turns off the speakers, look near the output sockets
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Can you hear anything from the speakers?
Hiss or hum usually means the speaker is ok
Total silence may indicate speaker failure, but only if there is one speaker, as in older home organs, or smaller keyboards
Try headphones next, TURN Down master volume first just in case!
If there is some sound, very quiet and gross distortion then possible power amplifier failure.
If your instrument has any kind of line out as well as a headphone jack, try these.
The line output will likely be a pair of phono sockets,like you have on HiFi equipment, 1/4 inch, 6.35mm jacks, like the bigger headphone connector, a 3.5mm socket like the smaller headphone connector, or even a DIN connector on older equipment.
Connect these to the aux (or Line or CD) input on your HiFi, guitar amp or similar. (some times these outputs will drive headphones, usually you will only hear anything in the left side). If this works then it is very likely the power amplifier.
Further tests on MIDI equipped keyboards would be to see if the MIDI does anything.
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If MIDI out doesn't work then the failure is likely to be internal power supply or something else critical (not nnecessarily major).
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Cost of repair will be down to the time it takes to get to the fault, taking these to bits and putting them back can take a lot longer than the repair.!
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Generally mono outputs on this kind of mixer are usually balanced. This means all three poles of the connector are connected. The hot or plus signal (tip) will go to the left of your phones, the cold or minus (ring) will go to the right. This will be ok from a sound point of view But it may not have enough drive to make the phones loud enough.
If you only hear a signal in the left then the output is unbalanced.
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Some keyboards use the amp output sockets for headphone use.
You might need some adapters for your headphones.
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I suspect the problem is bad switch contacts in the headphone jack that cut off the speaker line outputs when headphones are plugged into the pro keys. These jacks are, to put it bluntly, JUNK... they are EASILY damaged by pulling the cable plugged into them sideways. You will need to service the unit.

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ok, the snake is simple, each xlr (3 prong mic) connector on the snake is labeled, so, just plug each xlr jack into the corresponding channel on the board, and plug the first 2 1/4 inch ends of the snake into the "C/R out balanced" outputs on the board, located on the rear panel, up and to the left a bit.

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If you headphones work, chances are the moxer biss es are OK which probably focuses the problem on the output drivers.

Use headphones to see what jacks work... Remember that a stereo headphone will only have sound on one side for the mono jacks you test.

If your mains have a dedicated slider, one half of the slider could be bad. Usually you can tell those by a rougness as you slide them.

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Ensoniq zr-76 no output signal on main and aux, but have output on headphone jacks?


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More important than your keyboard for this question is the mixer you are using.

Put the metronome on a channel and only pot it up in an Aux send. Set up the mix for your phones using that same aux send. Use the main outs for PA.

That would be one way to do it. The idea is, you want to set up a mix for you, and a separate mix for everyone else. Mixers are capable of having several different mixes sent on their various outputs, so pick one to use for your headphones, and use a different set of outputs for the other mix.

A mixer does exactly that. It mixes. If you think of a graph, the X side would be your inputs, the Y side is your outputs. You can mix different versions of X at each Y.


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