Hi guys.
I just received a Yamaha EMX-3000 powered mixer for servicing.
This mixer had its power transformer changed from 240VAC to 120VAC. It is kind of a crappy conversion: the original toroidal transformer was replaced with a square one that is a little bit to big for this mixer. So someone made it fit, cutting out a square piece of the metal shielding between the console and the amp section, right above the trafo and squeezed it inside the enclose.
Issue #1: The mixer has developed a strange noise. With all faders down (no volume), a tone starts at about 1000hz and gradually moves down to about 100hz, then goes away and after about 5 seconds starts over. This goes on and on.
Issue #2: The digital effects built into the unit is not working.
Issue #3: 2 input channels out of 8 have more gain than the others. Im not yet sure if these two are overdriven or the other 6 channels are "underdriven"...
Any idea how to approach these issues?
Thanks in advance!
I just received a Yamaha EMX-3000 powered mixer for servicing.
This mixer had its power transformer changed from 240VAC to 120VAC. It is kind of a crappy conversion: the original toroidal transformer was replaced with a square one that is a little bit to big for this mixer. So someone made it fit, cutting out a square piece of the metal shielding between the console and the amp section, right above the trafo and squeezed it inside the enclose.
Issue #1: The mixer has developed a strange noise. With all faders down (no volume), a tone starts at about 1000hz and gradually moves down to about 100hz, then goes away and after about 5 seconds starts over. This goes on and on.
Issue #2: The digital effects built into the unit is not working.
Issue #3: 2 input channels out of 8 have more gain than the others. Im not yet sure if these two are overdriven or the other 6 channels are "underdriven"...
Any idea how to approach these issues?
Thanks in advance!
Statistics: Posted by Phantombox — Thu Jan 30, 2025 2:45 am