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Where can I purchase a replacement power supply for a Behringer PMH5000 mixer desk.

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Fred Yearian

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SOURCE: Need Behringer Eurorack mixer power supply connector

Those were used for mic connectors at one time,,, they are related to the Amp 91-MC3F family of connectors and those are out of production and they are demanding $20 to $50 for one connector.

That is a ridiculous price and I would be tempted to swap out the connector for a more available design.

On eBay item 250401122616 is one but they want $13 pus $11 shipping which is a rip off.

These were used on some OLD CD radio mics.

Posted on Dec 15, 2009

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Fred Yearian

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SOURCE: Behringer Xenyx 1622FX. Power supply has failed,

Suspect a broken circuit trace or broken solder. If they use a 7805 three terminal regulator, check the solder around those pins...
Berhinger does NOT release schematics except to their service facilities... I know... I have tried... I repaair a lot of their stuff and have to trace out the circuits.

Power supply circuits are rather easy except for the switching regulators if they have failed totally.

If only the +5 is dead, you should be only a filter cap and a diode or two away from the problem... Transformer leads and electrolytic leads with their weight are favorite to pull out of solder... On Behringer, often the traces are narrow and can have a crack in them.

Posted on Jan 13, 2010

Fred Yearian

  • 5603 Answers

SOURCE: 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.

Posted on Apr 05, 2010

Fred Yearian

  • 5603 Answers

SOURCE: LEVEL POT ON A BEHRINGER EURORACK MX 602A-BAD

It appears that both these use a 50K pot in the identical circuit and it is UNLIKELY they re-engineered very much so it is likely they use the same pot.

Behringer parts service should be able to tell you.

Posted on Apr 28, 2010

Fred Yearian

  • 5603 Answers

SOURCE: My Behringer XENYX 2442FX Mixer does not power up,

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

Posted on Dec 15, 2010

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That , as far as I know, can only be bought through Behringer. They will probably NOT sell it to you or help you. THEY want you to buy a new one. This is one of those companies that has most of their semiconductors marked and labeled with odd numbers of their own so a technician will have no clue what values they are or where to get them. Behringer is the one main brand of equipment I have never been able to get ANY parts for other than colored resistors or diodes, some caps, switches and lights. Finding a schematic is easier done than to actually find replacement parts. Sorry, wish I could help more while being as honest as possible.

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If you have the polarity correct for the connector, and adequate output from the transformer with adequate regulation and filterning, there should be little problem with constructing one or hacking the cord off the dead supply and wiring it to a new one.

The question you need to ask yourself is whether that wait is worth it? If you need it to make money with it right now- then just use care in wiring the new supply up. I have lost track to how many times I have rewired a supply to make it work on something it was not originally on. As long as the specs on the new supply match those of the old one- no problem..

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That sounds bad! I haven't heard of a runaway supply for these... Testing of the power supply is in order. The LED's are all driven from the +15 volt supply which is secondary regulated by a three terminal regulator... probably a 7815. I have seen failures of this chip in another Behringer product so it may be a bad batch. The question now is if this has fried the main switching power supply.

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These are delivered with a power supply. If yours has failed, LIKELY there are other problems. I have repaired several supplies and can coach you through which parts to replace. Often the failure originates with a shorted MOSFET in one of the amplifier channels, usually the rearmost one. Getting parts for these is really hard as FullCompass is the Behringer parts distributor. The SPS1000 supply takes out about $25 of parts when they go. The hardest parts to replace are the IGBT transistors as the heat sinks are hard to remove to get the screws out of the transistors. All the repair parts are available using five different online sources.

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1 Answer

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That time lag would indicate a thermal problem.

Likely the power supply is a switching type that has some three terminal regulators after it such as 7805, 7815, 7915.

These have thermal protection in them and one may be shutting down.

Use circuit cooler to isolate the part that is shutting down.

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Problem is likely thermal. Open unit carefully and use freeze mist (circuit cooler) to find bad component.

With that long a time period, it is possibly a component mounted on a heatsink.

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