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Leem m86t power mixer amplifier

I have no output from this mixer and the phantom power led stays red condition. I had to fit another power output relay as one was blown contacts. the 2 relays dont seem to be working either . the leds indicate from the mic input but no power output to speaker.

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Probably blew the amps or the pre amp section

Posted on Oct 08, 2008

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Everything wired right but light on amp won't come on. Took it apart an not burned anywhere. What's the problem an how to fix it?


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

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I need a service manual for a behringer pmh500 powered mixer


If LED's or other indicators are lighting, then the power supply is likely OK.

If nothing lights, then the supply has fried and LIKELY fried as a result of one of the power amps shorting.

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look at these and only these... power or ground...either your power wire has grounded out somewhere (ud be surprised) or youdont have a good enough ground....i would check the ground first....hopefully this helps

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Ive bought a Peavey 1500 pa amplifier and would like to know are the a b knobs on the front treble and bass.If they are how would I take the outputs at the back of the amp to my Soundcraft mixer.


The Peavey A/B controls are output gain controls. Your mixers stereo output goes into the amps inputs, channels A & B. The Peavey is the output stage to your speaker system. If you you connect the outputs from a power amp to the inputs of a mixer you will blow the mixers input stage, amongst many other things and possibly damage the amplifier too. The bias (Bass, Mid, Treble controls) are on the mixer, not the amplifier. Unless you are using a mixer amp, which you are not. A PA system DOES NOT work in the same way as an intergrated hi fi amp.

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1 Answer

Lightning strike to powered console.


On a generic level, without knowing the specifics of your equipment, I.E. amp & mixer make/model, you start at the mixers input stage. If an amplifiers output transistors die, they usually cause the amp to trip or blow a fuse, the weakest point in the system. If the amp is not doing this then the chances are, it's an line level problem, mixer related.  Again, you have to list the equipment you have in order for me to be more specific.

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Have you tried a 2sd6041? sometimes japanese trannys use this prefix.

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1 Answer

Hi i am matt


If the protection LED lights only after the remote voltage is applied (head unit is switched on), the amplifier likely has shorted output transistors. If the protection LED remains lit without remote voltage applied, the amp may have other problems.

Does the protection LED light with no speaker wires connected to the amp and no RCAs plugged into the amp?

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1 Answer

Amp has Red LED light on.


Disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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I believe that the actual unit may have other problems and that you will need a schematic to aid in your troubleshooting of this issue. Once you have the schematic and a multiment you can check the voltages to see if things ar as they should be and then we can look at what is happening.

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1 Answer

No Output from amp, green LED on


are you absolutely certain your subs are in good shape? have you put a meter on them and measured the ohms as you depress the cone [causing the cone to move up and down on the pole of the magnet? do the ohms stay constant? go up to infinity[ suggesting an open] or go to zero or close to zero [ suggestting a short] both of these conditions will result in a zero or a very limited output from your amplifier, while still showing a green status light, if or when a full short or open occurs on the subs, a fault led will become lit, and whet that means is that u have fried the outputs....do a bit more testing with your vom....and good luck or try another speaker for testing purposes...

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