Allen & Heat, Xone 92 - Dj Mixer - Leaking signal from any channel to all others.

[BrainKaos]

Hello,

I have a friend who is experiencing a problem on his "Allen & Heath Xone 92" dj mixer.



So the problem is when he turns up the fader of any channel that is playing music, all the other channels in the mixer start lighting their audio VU meters like if you were playing from the same source, blinking the red led's up to -30db. I mean the other channels seems to receive the same signal of whatever the channel that is playing music.

I leave a video showing the problem: https://www.youtube.com/watch?v=HKD_-Lzfi84

The mixer is 2 years old, and has been powered on for about 3 hours per day but just in the weekends, and in a studio, so no "abuse".

We have found the full set of schematics (which I also attached here), but we don't know really where to start looking for the problem, so any kind of help will be very appreciated.

This model is now manufactured in China and delivers Samwha capacitors, which are different from the ones used in the units that were built in the UK.

UK vs China:



Thank you very much,

Best regards,



PD: I'm sorry for my bad English.

[budm]

Re: Allen & Heat, Xone 92 - Dj Mixer - Leaking signal from any channel to all others.

So it has crosstalk problem? Did it just start doing this?

[BrainKaos]

Re: Allen & Heat, Xone 92 - Dj Mixer - Leaking signal from any channel to all others.

Thank you vey much for your reply, budm

So it has crosstalk problem?

Yes, it seems.

Did it just start doing this?

yes, you are rigth, It started suddenly...

PD: another thing we noticed is when you saturate the signal in the channel that has music, and you press the PFL/CUE button of any other channel that has no audio on it, you can hear some crackle/click/noise on the channel that is playing music, and the VU meter at the top of the mixer starts to illuminate as as if he were receiving an input signal.

This VU meter:


PD2: I found a PDF file (attached) made by Allen & Heat to fix a crosstalk problem in other of his mixers. (It may help, I don't know).

[BrainKaos]

Re: Allen & Heat, Xone 92 - Dj Mixer - Leaking signal from any channel to all others.

ok, we are going to start checking voltages in the power supply.

[BrainKaos]

Re: Allen & Heat, Xone 92 - Dj Mixer - Leaking signal from any channel to all others.

ok, we are going to start checking voltages in the power supply.

Here's a video showing the power supply. It seems to be in good shape.

https://www.youtube.com/watch?v=DDeRopyNzZc

We have noticed this PSU comes with Aishi, CapXon and Jamicon capacitors.

So, are this crapcaps? shall we replace them?

[BrainKaos]

Re: Allen & Heat, Xone 92 - Dj Mixer - Leaking signal from any channel to all others.

well, I found another user with the same problem and says that ""This is fault that Allen&Heath can't fix. I have the same problem. They exchange the mixer and is still the same so they blame my setup. The problem is related to grounding system...""

Video: https://www.youtube.com/watch?v=CDETEHTkkLk



if possible... thanks!