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Nil got sent to your link looking for a schematic for a yamaha em 150 powered mixer

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Posted on Jun 26, 2009

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Channels 1 and 2 on a Yamaha MG166cx-USB mixer seem to be burned out. They aren't working. Other channels are fine. Any idea what the issue could be?

Get the schematics. ALSO, MANY TIMES IT IS AN ISSUE OF THE INSERT JACKS BECOMING DIRTY ! Spray some cleaner and plug/unplug a plug (sic) several times. That has saved me many times. Luck !

Feb 20, 2014 | Yamaha MG166CX-USB Mixer w/ Cable and...

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Yamaha em 150

I would suggest stating your question!

Jan 05, 2014 | Yamaha EM-150 Powered Mixer For Repair...

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Can I connect only one speaker to a yamaha emx 312 sc power mixer?

First it is certain that you would not want to plug both outputs of the stereo power amp into one speaker combining both channels into the same speaker. (see image from manual below - also link to manual)

Next I would be very concerned about only using the one side of the main amp out as it could cause an unbalanced load, or you could be driving the load into dead air connection and any of these conditions are destined to cause premature failure of the power amp.

Taking a quick scan of the manual for this unit, it appears what is pretty common to most powered mixers, hook up two matched speakers/loads to each chanel of the output.

Your best bet is to shed those monster cabs, there really is no need for them especially with this sized powered mixer, and get yourself a nice pair of full range cabs like EV1202;s, EV SX300's, or some nice 2 or 3 way 15" JBL's/

Just my opinon.

Link to Yamaha EMX 312 Owner's Manual:

Yamaha EMX Series Owners Manual


Dec 06, 2013 | Yamaha Music

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Yamaha P155 wont power up, replaced power supply w correct one. Any ideas?

Double check the supply... it should be a PA301 which is 16 volt DC at 3.5 amps... fairly hefty one.

Download these schematics:


A lot of Yamaha have similar circuits between different models.

When you go to these links, scroll down the page looking for a small link "Get Manual". They will only let you download two a day without registering.

The first of these has the power entry on page 154... the second is on page 60. Both use the 16 volt power adapter. See if one of these schematics is not close enough to your unit to troubleshoot it.

Mar 26, 2011 | Yamaha P-155 Electronic Piano

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I have a Eurodesk 150 watt power supply that will not power up. It may have been struck by lightning. I am looking for a schematic and advice. Thanks, Tommy

You MAY find the schematic is close to one of these:


If the main switchers are shorted, then likely the driver transistors are also gone.

Fpr personal SAFETY please use an isolation transformer when working on this.

Hint: Use a 60 Watt light bulb in series with the power input to act as a fuse when unit is "restored" to protect it if not quite all of the blown parts are found, during troubleshooting.

Jan 09, 2011 | Behringer XENYX 2442FX Mixer

1 Answer


Please check the below link, wherein the foto explains you where the power socket exists:
Hope this helps

Nov 05, 2009 | Computers & Internet

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Connecting two powered mixers

Hi, If you have small electronics knowledge this might help you. First fine in each mixer the amplifiers line In if your mixer has two amplifiers then you have four line In. Disconnect this line from your mixer and build a circuit Line out multiflier. You can use op amp for this application this is a simple circuit. You made two input and four outputs. If you are interested i can send you a schematic diagram.

Aug 10, 2009 | Audio Players & Recorders

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Tapco MIX60 6-Channel Mixer

It does not appear to have a crossfader

Check this link for a closer look at the mixer. You can click the "larger image" link and get a really good look at it. Unless one of the knobs are a crossfader, but I always seen sliders as a crossfader. At least you can see it better here.

Jun 30, 2008 | Yamaha Mg8-2fx 8-Channel Mixer with...

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