Odd crosstalk issue **SOLVED**

[kilmister]

Hello all.


I have weird crosstalk issue in my clients 4056G/G+ console.
Console has 24 channels at left side of master section and 28 at right side. There's 4 empty slots (channels 45-48)


Crosstalk happens in mix bus (LF/RF) only at right side channels 25-56. We injected 1kHz tone in to line inputs at various channels and when hard panned to the left channel tone leaks to the right channel around -50dB. Vice versa when channel is hard panned to right. If tone is driven through small fader and matrix to the mix bus everything is just fine.

I have absolutely no idea where to start looking this 

All ideas are more than highly appreciated!

Cheers,
Paavo

[radardoug]

Faulty panpots. And -50 is not that bad.

[kilmister]

Solved it.

Classical bad ribbon connection issue.

-Paavo

[xmax]

Awesome! These problems can get very creepy with virtual earth summing! Thanks so much for sharing
even after the problem was solved! 

[Josh Moran]

Hey Paavo,

Having a similar issue, which ribbon did it end up being for you?

Thanks,

Josh