I have a Behringer Eurorack MX 1604A Mixer I bought about 9 years ago. I mostly use it as a headphone amp/monitor mixer in my home studio setup.
Recently I noticed the smell of magic smoke, but couldn't tell where it was coming from, but then a coupe of days later I noticed that the area on the mixer right above the headphone jack (where the logo, voltage regulators, etc., are) was very hot. The mixer was still working. So I powered it off, and let it cool down, and powered it back up, and as I expected that area got hot again.
It was warm enough to be uncomfortable to touch. I didn't try powering it up with the case open, but I'd expect that part might get visibly hot.
So I powered it down and after it cooled, I opened it up. No easy feat with all the knobs, screws and nuts that need to be removed!
I can see where there was smoke in the case, and one of the three voltage regulators (the one on the right side closest to the corner when looking from the top) has a brown spot under it on the circuit board where it had gotten hot. The part itself does not looked burned.
So, my question is; would replacing that part be enough, or should I expect that it either took some parts with it, or was triggered into failure by other parts? The diodes and electrolytic caps look OK, but one of the caps might have a slightly swollen vent cap. I'd imagine it could stand to have some higher rated parts in there.
Any one have any experience with these mixers or a schematic?
I could just replace it with a headphone amp, but if it just needs a new regulator, that would be cheaper, and it does still function.
Recently I noticed the smell of magic smoke, but couldn't tell where it was coming from, but then a coupe of days later I noticed that the area on the mixer right above the headphone jack (where the logo, voltage regulators, etc., are) was very hot. The mixer was still working. So I powered it off, and let it cool down, and powered it back up, and as I expected that area got hot again.
It was warm enough to be uncomfortable to touch. I didn't try powering it up with the case open, but I'd expect that part might get visibly hot.
So I powered it down and after it cooled, I opened it up. No easy feat with all the knobs, screws and nuts that need to be removed!
I can see where there was smoke in the case, and one of the three voltage regulators (the one on the right side closest to the corner when looking from the top) has a brown spot under it on the circuit board where it had gotten hot. The part itself does not looked burned.
So, my question is; would replacing that part be enough, or should I expect that it either took some parts with it, or was triggered into failure by other parts? The diodes and electrolytic caps look OK, but one of the caps might have a slightly swollen vent cap. I'd imagine it could stand to have some higher rated parts in there.
Any one have any experience with these mixers or a schematic?
I could just replace it with a headphone amp, but if it just needs a new regulator, that would be cheaper, and it does still function.
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