Question about Behringer VAmp 2 Power Supply

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I have no power to my V-amp. How can I test the poewr supply?

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Why does it keep going into protection mode?

There are several circuits that can prevent start up, not the least of which is the power supply itself. Check the owners manual, it may tell you about conditions that could cause this. The next step is to open it up. There may be something obviously wrong, burnt, disconnected or stressed. Barring that, we'd be into board and component level testing. If you know what your doing, the output stages of these high power amps are a good place to start.

Mar 01, 2016 | QSC RMX 5050 5,000 Watt Power Amp

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Mackie thump powered speaker. Traced AC to rectifier, no Dc at out put ,nouthing,? Power rectifier replace but look at regulators as source?

These must be one of the most fault prone speakers ever made. Disconnect the power supply from the amp and see if you can get it working then connect it back up but don't hold your breath, they regularly fail taking out the output stage which in turn takes out the PSU so check the amp with a limited and robust PSU or use a variac on the mains to test.

Apr 30, 2015 | Mackie Music

1 Answer

Fuse power amp is good I have power on power supply but the amp does not turn on what meaning is this?

Probably a bad transformer? Do you have power on the secondary side? Power in is one thing power out is another, hope this helps?

Mar 02, 2015 | Fender Frontman 212R 100W 2x12 Guitar...

2 Answers

I have a behringer eurolive b212d no power no lights on when I push the button I hear a clike in the speaker but no power. tested the fuse its ok. could there be a fuse inside the power unit .any help...


Eurolive Active speakers from Behringer suffers of bad power supply/Amp design, if you open up the back of your speaker you will probably find that the AC connector has a burnt or loose connection as well as a black spot, if not, check the power supply/power amp coils for cracked connections, let me know for improve help.

Sep 20, 2013 | Behringer B212D Powered Speaker (550...

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My Musical Fidelity Musical Fidelity XA-2 has suddenly lost some of it's depth and transparency of sound.

First is to check to make sure the power supply is putting out enough power.

From your description, it sounds like the classic signal "clipping" situation.

Since I tend to work from experience repairing a wide range of things, and I am not finding any references to your amp, not even in Russian sources, not even a picture, I have to make some assumptions for the moment, but this will help locate the problem.

Solder some test leads to an impedance matching transformer and the other winding to a plug that will fit your good headphones.

With chassis underside exposed, power up the amp, and apply a song you know well to the input. Use the test leads to check the 4558 IC's that are most likely to be found in the preamp stage(s) of the amp. and follow down the audio chain until you reach the power hybrids. If you happen to have the discrete transistors, those are better to work with and much easier to test.

If I am testing an amp in this way, I am listening for a dead spot, or a spot where the signal is very distorted. Being careful not to touch the power buss. Simply putting a test clip on one lead and attaching it to chassis ground is the easiest and fastest way to run through an amp.

if I am checking discrete transistors, I am just checking at the base lead of each one, or the gate if it is a FET until I find a distorted stage.

If you have power hybrid IC's, check at the website of the manufacturer of the IC for data sheets on that chip. Use those as a guide for checking voltages for the hybrid, as well as to help potential shorted components such as a capacitor or a resistor that may have failed.

If I know more details of the chips the amp uses, discrete transistors, or even if it happens to be a tube amp I can be much more specific.
Other things to check that are not always apparent- make sure there is a +15 colt supply and a -15 volt supply with respect to chassis ground when dealing with 4558 amp chips.

Feb 03, 2012 | Music

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Hi, I need the pmp5000 schematic or service manual. Because my mixer smps is faulty.. (On the smps pcb following parts are problem : T12 - D24 and 25? R11 open - D6 and D9 are short - TOP221 ? ) Best...

Oh yeah... know them well The IGBT transistors fail, the sand coated resistors blow open... replace as a pair. The driver transistors get blown... 2SA1020's and 2SC2655-Y's. One or more of the gate speedup diodes for the IGBT's get blown. The switching reg chips, IR2153 is usually gone. and more...

Here is your service manual:

Scroll down to "get manual" and click to download. Ignore other "download links".

You will likely find that one of the power amps has shorted... been there, done that several times. Usually the channel A (rearmost) power amp shorts takeing out the 9140 Mosfets and other parts. Often an internal short between an interior and upper layer of the amp circuit board is the fault that causes all this. Use a light bulb (150 watt) in series with the power input when testing after repair. Use an isolation transformer when working on the supply for personal safety. When supply is running again, discharge the 70 volt source caps before plugging onto the amp to avoid welding arcs at the connectors. I have seen the supply hold charge for several days.

Jun 29, 2011 | Behringer Europower Pmp5000 Powered Mixer...

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The amp was working fine and than just stoped , it wont turn on and all power is working.

The most likely problem in this instance is damage to the power supply, probably caused by a power surge. The second most likely cause is damage to the power cord. If you can take it to a shop that has similar amps on display, you can probably test it on one of there power cords. If the power supply is damaged, it will be a bit more challenging. At this point, if you know a bit about circuit boards and soldering, you might be able to fix it. If not, you will probably have to pay someone, or simply replace the amp.

Mar 14, 2011 | Line 6 Spider Iii 75 Guitar Combo...

1 Answer

My Roland will not power up at all. Not sure if it is the power supply or the handsonic itself.

Test the power supply with a meter. It should be 9 volts DC and it rated at 2 to 2.5 amps (2000 to 2500 ma)

Jan 20, 2011 | Roland HandSonic 10 Percussion Controller

1 Answer

When i power up the amp it makes a loud fuzzy wave sound then dies down a bit and you can play over it but the sound is weak and clunky. i took out the pre amp tubes and jiggled them around/cleaned some...

It sounds like your amp has one or more bad capacitors in the power supply. The AC mains input isn't being filtered properly, allowing hum and robbing the amp of the clean power it needs. It may be a case of bad solder connections, which is a very common problem in today's equipment. Another common trouble is capacitor failure due to under-rating the parts to keep cost down, leading to over-stressing and early failure. The shop you took the amp to should be able to check the caps and power supply operation, and replace any parts that aren't up to snuff.

Nov 23, 2010 | Peavey 6505 Plus 120W Guitar Amp Head

1 Answer

Hi, I want to repair BEHRINGER PMP3000power supply and I need the pinout diagram. Where I can find it?..

Those are a tough supply to fix. There are two power supplies on the board. A small switching one first starts and then when the input caps are charged a relay shorts out two large limiting resistors. Then the main power supply starts to generate the +/- used by the power amps.

When overcurrent is sensed, the supply shuts down... that is IF parts have not blown. Arcing within the power amp takes these out... the rear-most power amp arcs near the heatsink and wipes out parts there and sometimes in the power supply.

You cannot run this supply without a load on the small ofline switching supply that generates most of the smaller voltages. WARNING there are no bleeders on the capacitors on the big supply. If you don't bleed them and try to connect one of the power amps, you will get a NICE arc.

HINT: put a series light bulb like 100 Watts in series with the power input... saves fuses, the limiting resistors, transistors, etc.

Disconnect the audio line coaxes to the power amp and prop the face still connected to the supply to work on it.

The first thing is to weed out shorted transistors in the main supply (leave them out) and verify that the small supply is operating. If it is not, then likely the two sand coated limiting resistors have been blown... this is just a start on a typical repair of this.

Dec 29, 2009 | Behringer Pmp3000 16 Channel Audio Mixer

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