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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...

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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.
Bernie

Posted on May 28, 2008

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I hear a white noise when I connect microphone with mixer (Behringer DX2000)


You posted this in questions about the Shure PG42 mic. That mic comes in two versions. There's the USB version which connects direct to a PC. Then there's the standard version which is used with a mixer. I presume you have the standard version as the Behringer doesn't have inputs for USB mics.

The standard version is a condenser mic. It needs power. The power is supplied by the mixer. It is known as phantom power because it travels up the mic cable from the mixer to the mic.

  • Make sure your mixer has phantom power switched on.
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  • Check the setting on the mic for attenuation. 0dB is no reduction in signal level. 20dB is a large reduction

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Most times there's an issue with no sound from a mic, it's usually down to a poor quality or broken cable; or no power; or the settings on the mixer.

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No power on the mixer


There is a power connector in the back right corner. You need to plug in a good power cord to a good electrical outlet. There are two switches, one is for phantom the other is power, turn the power on, it should light up. If not check your cord.

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1202 fx phantom power swith will not stay engaged


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When the phantom power is on, some channels decide to come and to. Particularly with the SM57 mic


Don't know what you are saying. Phantom power is only used for Condenser mics and a few DI boxes. Make sure you ONLY use TRS or XLR cables into ANY/ALL inputs when using Phantom power. Please describe what you mean by :some channels decide to come". ONLY change Phantom power when system is off as you will get loud noise often by switching phantom while live.

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Behringer xenyx 2442fx : I need to know the correct voltages out of power-supply. Mixer has been seen by a previous tech and now FX area and mixer level leds are off (I've been a user of this mixer...


You should find pwer supply voltages of +/- 15 volts going to most of the op-amps.
You should find 48 volts for the phantom power source.
You should find 5 volts for the FX DSP or any other logic circuits.
You should find a +12 volt.

Here is a manual close to your unit (yours is an expansion of it):

http://elektrotanya.com/behringer_xenyx-1222fx_v1000_dpm5m_ub-spsu2_sch.zip/download.html

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I have an Behringer Xenyx 1222FX that won't power on but when switching on the phantom power light does illuminate. Checked all fuses and those are fine


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My Behringer XENYX 2442FX Mixer does not power up, the only light that comes on is the phantom power light. I opened it up and noticed that the switching power supply has multiple voltage outputs. We...


You should find +/-15 volts and +5 volts as well as the phantom power... but that light can come on at much lower than desired voltage.

Note that the regulators are current limited so a short on the mixer board can kill one of the voltages.... but you are not getting any input from teh switching portion of the regulator so the switching part of the supply is apparently dead. To replace the supply you would have to call Behringer at 1-425-672-0816 to get the part number and an incident number and then call FullCompass which is their part distributor now.

When working on a switching power supply, use an isolation transformer for safety and use a 60 watt lamp in series with the power cord to limit current during testing.

The circuitry will be SIMILAR to the power supply found on page 9 of schematic you can download at:

http://elektrotanya.com/behringer_ub1204fx_pro.pdf/download.html

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Behringer XENYX 1622FX, won't power on. Phantom power works(?)


After reviewing the schematic, I don't understand how the Phantom power can REMAIN on with the power switch off... this CANNOT occur except for what energy is left in the 48 volt supply filter cap... This might last for minutes after the fuse went... UNLESS you have devices connected which are backfeeding the 48 volts. (which would be a disaster)

The 48 volts, +/- 12 volts and +/- 15 volts and the +5 volts ALL come from the SAME switching power supply. I suspect one of the filter caps went or the primary switching regulator a TDP245Y chip.

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To do testing, one replaces the fuse and puts a 60 Watt light bulb in series with the hot side of the inout line. The lamp "acts" as a resetable fuse and limits the current for testing. When all is well again, the lamp will remain out with the power flowing through it.

The D1 diode bridge and C7 input rectifier and filter are first things to check. You can do those with an ohmmeter.

I will caution you to ALWAYS power any and all equipment from the SAME power source. Plugging in devices from across the room will set up ground loops and any ground fault will fry equipment.

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Block diagram available here:
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