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!
sounds like a hot mess with the mods to accommodate a replacement transformer...
with the effects not working and the sweeping noise you mentioned i would unplug CN101 and CN102 from that pcb to see if that removes your noise. simple to do to start sorting things out.
there's no switchable pads on the EMX so that doesn't help with the gain differences...which channels i particular?
with the effects not working and the sweeping noise you mentioned i would unplug CN101 and CN102 from that pcb to see if that removes your noise. simple to do to start sorting things out.
there's no switchable pads on the EMX so that doesn't help with the gain differences...which channels i particular?
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You were right, turk182. Once I unplugged CN102, the pumping noise dissapears. Now I have to figure out why the digital effects (DSP) doesn't work. The 5V regulator on this board was defective and I switched it for a new one, still not working. The checking continues...
the thing that usually kills the FX module is severe feedback(from an open mic)...as i don't have a hot air rework station i don't even attempt things like replacing the MCU and ZFX chips and replace the entire board. not cheap, i know...but you can still route to external outboard FX that are much better.
i hope tracing down the gain differences will be easier!
i hope tracing down the gain differences will be easier!
If I had a hot air reflow station, where could I buy these dammaged parts? Or where do you get the complete DSP (XZ633), in any case? I searched Yamaha, Zoom and eBay and these are nowhere to find.
There is one Yamaha guy in Caracas who can get any part, from the latest synth to an amp from 1967. But he charges a lot. I mean a whole lot.
XZ633 is the part number on the DSP assy for the Yamaha EMX300 mixer. The EMX5016 for example has the DSP X7574 which is different.
XZ633 is the part number on the DSP assy for the Yamaha EMX300 mixer. The EMX5016 for example has the DSP X7574 which is different.
I downloaded the service manual from Electrotanya. Now that you mention "old servikce manual", I'm not sure what year this mixer was made.
Now that you say "old service manual", I really don´t know the manufacturing year of this console...
Of cause. Still cannot find a replacement board nowhere online. And I've tried every combination of serial numbers and description, about a 1001 different ways....
Sad face emoji... Well, I guess my customer is better off using an external processor, since the replacement is expensive. You allready said this before.
Now I figuring out why some channels do sound louder then the others. With all pots at minimum (except faders), channels 6 and 8 have the most output, the rest do sound somehow attenuated
Now I figuring out why some channels do sound louder then the others. With all pots at minimum (except faders), channels 6 and 8 have the most output, the rest do sound somehow attenuated
i'd look for a loss of ground on the gain controls perhaps cracked solder joints on those channels
we always want more but have to live with less...
we always want more but have to live with less...
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