I replaced the transformer and fuse which is in a sealed compartment above the power supply connection in djx 700 (behringer) and still have humming in the new transformer

Actually, you may be in luck. A burned cap means that it has done exactly what it's supposed to do. So...you might stick an identical one in there -- it's a 0.1 uF cap, and you can find these at Radio Shack (0.1 uF 50V) or online. They are cheap, so give it a shot.

If you have the polarity correct for the connector, and adequate output from the transformer with adequate regulation and filterning, there should be little problem with constructing one or hacking the cord off the dead supply and wiring it to a new one.

The question you need to ask yourself is whether that wait is worth it? If you need it to make money with it right now- then just use care in wiring the new supply up. I have lost track to how many times I have rewired a supply to make it work on something it was not originally on. As long as the specs on the new supply match those of the old one- no problem..

You are probably overdriving the inputs. You haven't told us the source of the inputs and we can't guess where they may come from. You need to read the manual and make sure your source outputs are within range of what this unit requires.

Transformers RARELY fail. It is likely that either one side of the amplifier has shorted or there is a failure in the rectifier/filter circuit of the power supply. Take it for repair unless you are adept at electronic repair. Do NOT continue to replace the fuse as you MAY cause futher damage. Use a 25 or 40 watt lamp in series with your power cord to limit current while troubleshooting.

The internals run on +/-15 Volts and +5 volts. While schematics show the audio and digital circuits they fail to show the power supply. I suspect the supply uses regulators such as the 7815 family so one would want around 18 to 20 volts DC of each polarity.A transformer would likely be about a 28 to 30 VAC centertapped. HOWEVER transformers rarely fail. There should be fuses to protect the transformer. Some Behringer equipment uses a switching supply. Common failures in those is the switching transistor. When testing these units, it is useful to place a 25 watt incandescent lamp in series with the power cord to save fuses and act as a resetable fuse that will send a limited current into the unit for testing.

Sounds expensive. How did the Canadian plug fit a UK socket? The fuse won't have blown fast enough to avoid all damage. Their coucld be an internal fuse - see instruction book. It won't be a home repair job it its not the internal fuse - sorry.

Suspect a ground problem someplace in the system.

Make sure your system is plugged into exact same recepacle that anything else you connect to is plugged into.

Also make sure a spot light is not heating it.

This is a wild educated guess.

I repaired a Behringer guitar amp that had a DSP effects in it (BX1200 I believe).

The effects were on a seperate board and the board had its own 5 volt power supply. The filter capacitor for the 5 volt power on the board was UNDERSIZED and it had degraded causing the 5 volts to drop out of regulation, dipping to 4 volts. This caused the DSP effects to fail.

YOUR device MAY use the same DSP OR design.

Check the 5 volt power with an OSCILLOSCOPE to look for dips below the 5 volt operating point that occur at 120 HZ.

Behringer only gives schematics to their authorized service people.

I find I can usually trace stuff out as needed as the mixers are a very symetrical repeating circuitry.

Most components are readily available from other sources.

Hi. I have an 2 ADA 8000 and one went down with the same fault after 7 years.
Firstly, there is a slow blow fuse in the back above where the kettle lead goes in. CHECK THIS FIRST!
If, like me, you change it and it blows again, change it a second time and it maeks a "crackling noise internally. There is a problem with the internal transformer.
From a lot of talking and searching, I've found out what you need to do. Either yourself or and electronics expert needs to do this.
First of all, you need to order a NEW transformer. You need the specific one from Behringer.. I am in the UK and obtained it from EMS. Their number is 01702 613 172. While waiting for this to be delivered, you need to check the power regulator and the 100Nf capp and the 10Nf caps as these can go faulty and cause the transformer to "over work", meaning that as soon as you put in the new transformer, it could go again pretty soon.
These caps I'm told are generic and do not need to be obtained from Behringer. THE TRANSFORMER DOES.

I Hope this helps you all out as I could not find this information online, this is from genuine experience, from people "in the know". Please spread this info about to help others like us who are stuck in a tight place.