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Behringer mixer UB 1622 fx pro

I turned on mixer no"power on" light but flick the phantom power switch and that comes on.ive had the mixer in bits to no avail....has it got an internal fuse and if so where the heck is it?????? ps....product list is a bit vague!!!!!!!

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  • mike_imhoff
    mike_imhoff Mar 27, 2012

    From my experience with these mixers the power supply has failed... The 48 volts part that runs the phantom power seems to be working... If your effects numeric LED is on then the +5 volts part is OK... If the little power LED is off and the mixer is silent then the +15, -15 volt section has likely failed...


1 Answer

I've seen inside these mixers (euroracks) and they have a recurring problem.
Next to each op-amp there are small decoupling caps from the power supply rails to ground. These caps, due to 'cost constraints' have 1 volt of headroom- the rails are at 15 volts and the caps rated 16v.
This means they have about a 65% chance of failure.

Also, the psu. is connected via a connector. If you disconnect this and see if the psu powers up with a meter you can figure out if the psu is broken or if the circuit board is 'dragging it down'.

Hope that helps.

Posted on May 28, 2008

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