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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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1 Answer

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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I brought a gxl1200 the sound dont come out


Two words..."phantom power." Condenser mic's like yours require 48 volts of phantom power to operate correctly. Look for a "phantom power" OFF/ON switch located somewhere on your audio mixer or if you're not using a mixer, buy a in-line phantom power supply like this...http://www.amazon.com/b?ie=UTF8&node=11974571.

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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.

Jun 07, 2011 | Behringer XENYX 2442FX Mixer

1 Answer

I have the CAD ST100 microphone i need to know the power to supply this and pin outs.


The ST 100 microphone is a phantom powered unit. So, it receives its power by the same terminals used for its connection, not needing a separated power supply.

In general, most mixing consoles offer the option to feed the balanced microphones with 48 volt via a switch that can turn on or off its internal phantom power supply.

If you are going to use the ST100 microphone with a common amplifier or mixer, you will need to buy a separated phantom power supply. Searching the Internet for "phantom power supplies", you will find many available models and brands.

To know a little bit more about these power supplies, please check the following link:

http://en.wikipedia.org/wiki/Phantom_power

Good luck!

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1 Answer

What is the switch for on the Phantom power unit at the end of my AKG C747?


Hi,the switch for the phantom power on the microphone is to activation of the mic.Without the phantom being activated, the mic will not work.

It can only be activated with a mixer console that has a phantom activation on it. After connecting the mic to the mixer,activate the phantompoweronthe mixer and switch on the phantom power on the mic,and problem solved.

Note: Mic will not work if no phantom activated on the mixer.

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1 Answer

I'm buying a Rode NT1A, it comes with a shock mount, pop filter, xlr cable etc. What else besides a USB converter cable to I need to have this mic work it's full potential on a PC?


Hi, what else do you do think you will need? I don't think you will need any other thing except that before you use the mic, the switch for the phantom power on the microphone is to be activated .Without the phantom being activated, the mic will not work.

It can only be activated with a mixer console that has a phantom activation on it. After connecting the mic to the mixer,activate the phantom power on the mixer and switch on the phantom power on the mic,and problem solved.

Note: Mic will not work if no phantom activated on the mixer.

That all you will need .

Thanks for using fixya....

Oct 20, 2010 | Rode NT1A Professional Microphone

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I have a rode mic. it doesnt work thru my bhrngr pmx 2000. i have been told i need phantom power. but doesnt the mixer come with that? ric


Yes this unit comes with Phantom power, but you must turn it on. The switch for this is located next to the XLR connector for channel 9 and the bottom of channel 10. Make sure that it is turned on. The LED should be lit with phantom on.

Dan

Aug 26, 2010 | Audio Players & Recorders

1 Answer

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.

You should ONLY work on the line side of this using an ISOLATION transformer since the line side has lethal voltages.

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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2 Answers

Sennheiser em100 g2 receiver passes major static to mixer


This is a well known problem with the EW100 series that is easily solved.
You will need to run this reciever into a line input via a mono(TS) jack to jack lead. this will bypass the phantom power.
Make sure that you set the AV OUT to +18 in the reciever menu to get optimum level.
Phantom power is only present in the microphone inputs XLR3.
Hope this helps.
Rus.

Mar 01, 2009 | Sennheiser EM100G2 RACK MOUNT G2 RECEIVER...

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