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No phantom voltage on XR1600F. Any suggestions?

Is this repairable without a schematic?

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Potentially. Capacitors are what prevent the DC component from flowing through the amplifier where you want only AC, so it is pretty brutish and easy to find.

It likely is a failed zener diode, or a failed bridge rectifier, or single rectifier depending how they chose to do it. Since it is isolated to the inputs, that is where it will attach. Either to pin 2 or 3 on the XLR. It will be isoalted from the preamp by a capacitor on the order of 0.1 microfarad to 0.01 microfarad. It might be higher, but not likely.

If replacing a Zener, match for voltage, but go to a higher current type. If replacing a 1 amp bridge rectifier, go with a 3 amp if there is room. If replacing an 1N4001/1S4001 go to a 1N5403 or higher voltage rating even.

Posted on Feb 13, 2012

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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.


You should find +/-15 volts and probably +12 volts an +5 volts as well as the +48 phantom supply. If only one of these is missing, check the regulator for it... most are three terminal regulators. If the one that is missing has a hot regulator you have a short someplace and this requires skill to locate Probably the fastest way is to use a thermal imaging camera... however I have often used a millivoltmeter to find where the supply drops tpo near zero. Using a "calibrated" finger and search for a hot component on the circuit board can be very effective. Likely one of the surface mounted chips has shorted. Replacing these requires skill so best leave board repair to a skilled repair person as you can easily damage the board permanently.

Oct 04, 2011 | Behringer XENYX 2442FX Mixer

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Every input channel has a green light on when all the buttons are disconnected. This is with nothing plugged into the system at all.


Just worked on one of these. What causes this is when one of the 16 volt plus or minus supplies is shorted out or low. Check the supply voltage and PRAY that the fault is NOT on the main board... takes a lot of time to pull all the knobs and unscrew the main board and the headphone jack to get the board out. The one I fixed had the MAIN insert driver blown causing no main output. Here is your service schematics... note there are SLIGHT discrepancies depending on the vintage of your unit.:
http://elektrotanya.com/mackie_1604vlz.pdf/download.html

Scroll down to "get manual" and click to download. IGNORE other download links.
You can access the power cable to the main board by removing the bottom access panel. You will find the voltages reading across the connector from left end as +16, grd,-16 and then several others including one at about 9.5 volts and then the phantom power at around +48 volts... You may find the -16 or +16 pulled to the opposite polarity if one of the regulators has failed. This supply runs very hot and seems to be enclosed in a mu-metal magnetic shield as well... or at least the one I repaired had that.

Aug 02, 2011 | Mackie 1604 VLZ 3 16 channel Analog Mixer

1 Answer

Behringer XENYX 1620FX, won't power on. Phantom power works(?)


Here is a schematic close to your unit:

http://elektrotanya.com/behringer_xenyx_1622fx.pdf/download.html

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

The phantom power is a separate rectifier and regulator. See page 11 of the download service manual for the power supply. Be careful when working on line operated switching supplies. I suspect you will find one of the other supplies is dead. If the phantom is OK, then the switcher is working and one of the rectifier/filter/regulators is bad. Check if an electrolytic cap is shorted.

Jul 21, 2011 | Behringer Xenyx 1002fx Mixer 10 Input 2...

1 Answer

+48 volt in power supply is not working. All other voltages are present


Download the schematic at:

http://elektrotanya.com/mackie_1604-vlz_mixer.pdf/download.html

Scroll down to the link to download that says "Get Manual"

This is for the 1604 unit which is just a truncated version of yours. When downloaded, find the phantom power supply on page 18.

There are too many components to guess which one so best just to troubleshoot.

I would even suspect the phantom switch since they have POOR design with no inrush current limiting when charging the input capacitor. Since the 48 is not individually fused, if the inpout cap C3 shorts, it probably will take out the switch or the diodes.

Another user had the Zener D9 fail which would cause the problem. Meter the voltage across C3 (probably about 60 volts) and D9 and C4 (47 volts). First check C4 as that cap is run TOO close to the rating of 50 volts... poor design... C5 would also be suspect... or Q1 and Q2.

Then it gets dicey as there are UNDOUBTEDLY many bypass caps in the mixer portion of the board.

Apr 02, 2011 | Mackie 2404-VLZ3 Mixer

1 Answer

Behringer Xenyx 2222fx doesn't power up. I've replaced the fuse and power cord, still nothing. When you flip the phantom power switch, the red +48V indicator light comes on on the front. Other than that,...


The Phantom power comes from a seperate winding on the switching power supply.Likely one or more of the other voltages are not present due to a failure of one or more components. The supplies are current limited so a short anyplace on the board may cause the problem. I had one of these short betwen the +/- 15 volt busses because somebody spilled liquid into it.

Here is a close schematic... a slightly different model with less channels, but circuoitry is the same, just more copies of it in yours: I believe it is zipped with four files... the last is the power supply.

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

Feb 19, 2011 | Behringer Xenyx 2222fx Premium 22 Input...

2 Answers

I've owned a Roland AC-90 acoustic guitar amp for 8 months and am having problems with the XLR mic preamp. There is some very low-level output with the volume fully advanced, and with an external...


I don't have the exact schematic... however sometimes they have RF bypass capacitors to ground on the balanced input lines and one side gets shorted. The schematic I do have is for an AC100. It shows a rather unconventional input circuit. You can download it here and it MIGHT be close to your unit:

http://elektrotanya.com/roland_ac-100ut.pdf/download.html

I note that this unit does NOT have Phantom power so you CANNOT use a condenser type mic with it unless you use a preamp with Phantom power... Maybe that is the problem?

Feb 16, 2011 | Roland Ac-90 Acoustic Chorus Guitar Amp...

1 Answer

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

Dec 15, 2010 | Behringer XENYX 2442FX Mixer

1 Answer

What is the likely cause of the phantom power of a samson 900 mixer to go bad?


The phantom power is used for condenser mics. MAKE SURE you do not plug in other mics or devices that do NOT have balanced, isolated outputs as they will short out the phantom power to others.

You should find between 15 and 48 volts between BOTH pins 2 and 3 of each mic connector when measured to pin 1 of the connector. There is about 6K ohms impedance from the phantom supply to pins 2 and 3.

IF you have an accident and connected high voltage to pin 2 or 3 it COULD back up and blow the bypass cap for the 48 volts.

Please note: ALWAYS power ANY interconnected equipment from teh SAME receptacle to avoid damage due to ground bounce in the event of a fault in a piece of equipment.

Oct 22, 2010 | Samson Xm910 8Channel Powered Mixer...

1 Answer

What is the secondary voltage of power transformer


The schematics do not show the actual voltage.

From the design, the phantom power secpndary should be around 35 to 45 volts AC.

The 16 volt supplies would require a secondary winding that will be around 26 to 32 volts center tapped.

Transformers are quite reliable and unless a voltage is missing, the transformer is likely OK.

The most suspect items are the electrolytic filter caps if the voltage is not the design 16 plus and minus values.

Jun 16, 2010 | Mackie 1202vlz3 12 Channel Mixer

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