Djx 700 Assign not working and kill key - Behringer DJx700 5-Channel Pro DJ Mixer with Digital Effects & Bpm Counter

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.

The first thing I would look at is the kill switches on each side, make sure these are not pressed. Also make sure the master fader is up. I would disconnect anything that may be plugged into the effects loop send and return. Make sure the main outs are plugged in correctly, the main master outs should go to a power amp, this unit appears to be a unpowered unit. Make sure you are using the proper cables to avoid damage, lookup and understand the difference in speaker cords and instrument cords and place them properly. Also make sure the "assign A" and "assign B" are positioned correctly. Hope this helps but, if you give me a little info on how you are using this unit, I could help you further, please.

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... you wasted money on that... Likely one of the rectifier diodes/module or filter caps has shorted. Continued use will burn out the transformer. It is humming because it is overloaded with failing components.

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.

It is NOT likely the keyboard is "killing the speakers"... OR the headphones for that matter.

I suspect the problem is bad switch contacts in the headphone jack that cut off the speaker line outputs when headphones are plugged into the pro keys. These jacks are, to put it bluntly, JUNK... they are EASILY damaged by pulling the cable plugged into them sideways. You will need to service the unit.

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.

1200 ma provides more power than the 700 ma, and would not be affected by using it on a device that draws 700 ma. The voltage of the charger makes a difference as well as the polarity of the plug. (if it is dc)

If the 700 ma charger is not working, most likely the 700 ma charger is not working

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.