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Soundcraftsmen MA5002A ( B channel is dead)

One channel is non functioning we do not have the service manual and we do not know what transistors to use at the power stage

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  • mitsakos Apr 27, 2009

    The transistors I am looking for are round metallic as the MJ15025 and on each side three of them have the number (5) and the fourth has number (26) and on the other side they have number (8) and the fourth has number (25). Thank you.

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Each of the output transistors should have numbers/letters silkscreened on them. Post the markings here and I can give you the entire part numbers.

Dan

Posted on Apr 15, 2009

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1 Answer

Why channel A clipping on soundcraftsmen ma5002a what's wrong


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One side dead


hi zm_16dec,

Right chanel fully dead , output transistor burnedout ,

Without knowing the make and model of your amplifier

all i can advise is to replace the unknown part number of

the transistor.


Look for the working left channel output transistors and

replace the bad transistors in "pair". These may include

other components but check on it as well.


Check the speaker system, especially where that channel

is connected.Inspect speaker wires or cable up to the speaker

itself.


Amplifier wont blow without reason.It could be from the wirings,

speaker or volume settings of the unit.

Thanks for choosing Fixya for assistance!

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Though any transistor(s) might well have gone and the capacitor could be changed, I see no reason to change any resistor unless it's burnt up or giving an incorrect resistance reading. A multi-meter will tell you if a resistor is working or not, if it's not dead or weak it won't make a lot of difference to the circuit, but replacing it will simply cost you more money!

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Make sure the three position slide switch is set correctly for the stereo usage, that is NOT the bridged OR the Mon mode.

MAKE SURE the pan pots are set to middle as they control the spit of the audio to the two channels.

This is a class "D" amplifier (switching) and there really isn't any fuse for a single channel.

MAKE SURE your speakon connections are good by swapping your speaker cables.

I repaired my unit and had to do that without schematics... Behringer will not give them out. Mine had a severe arc-over on one side power amp taking out about ten transistors and diodes and one swithcing regulator chip. Had to cut out the "cancer" of the burned board.

This unit uses a complementary output stage that is made up of one transistor on one side and a pair in parallel on the other. This drives the inductor/capacitor filter... I think the switching frequency is between 100KHz and 1 MHz as I recall. All those transistors were gonzo. It also fried the main power switching transistors in the power supply, several smaller transistors, diodes, and the switching regulator chip.
Also two 10 ohm power resistors were fried. They soft start this unit by charging the main caps via two resistors that limit the inrush current.
A small switching supply has to come up first before the main supply which sends the DC to the amp section.

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Before asuming it is the power transistors check the power on relay first as mine had the same proble and it was because of the Relay that did not switch on the one channel or amp (remember this is a power amp and consist of two mono amps)

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Sounds like the power transistor(s) on that channel burned out. Needs service.

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output stage problem, systems trips due to protection. have the power amp transistors checked. the rotating of function switch is normal, its like a routine system check

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