Question about Majestic MA4200R Car Audio Amplifier

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Transistors i need to know what type of transistors is used for this amp and i also need a wiring schamatic

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  • Islam Loma Feb 26, 2013

    2sd1065 or d1065

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Are the transistors missing?

You're unlikely to find a schematic for it. Since the amp is likely a clone, you may be able to use a schematic from another manufacturer to troubleshoot it. If you can send me a clear photo of the power supply components around the TL494, I may be able to help.

babin_perry@yahoo.com

Posted on Aug 01, 2008

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Components Q12 & Q13 (2N 3906) PNP transistors fried. Would there be anything else blown?


It is sad your having a problem with Q12 and Q13, check the regulator

that supply voltage on the transistor 's your referring to.


Q13= 2SA1478 for Mackie SWA1501 Active Subwoofer

the supply is about +15V and -15V

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Hooking up the amp i had the ground wire connected and was going to hook up the power wire and it hit the case of the amp know the amp turns on but there is no sound from the speakers other amps work on...


sadly, your amps' output MOSFETS are more than likely toast.

your amp was grounded, and you touched the amp chassis with the power line.
electricity will follow any path available to find ground. in your case, the output mosfets became your main ground-path since they are directly connected to the amps chassis (heat sink) and internally you had grounded the amp so power would flow full force through the output transistors in the serach for a ground.

open up your amp and smell the row of MOSFET transistors. you'll probably even be able to see some burnt transistor legs.

repair or replace.

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Fire under hood need under hood wiring schamatic to fix


Go to a local Partsource store and you can use their mitchell on demand every store has one and it is available for the customeers to use and print off stuff. Just type in year/make/model and click on electrical schematics and pick what you want and print it. Its free to use.

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they are so many ways to run a dvc sub, let me know what ohms the coils are, and i will give you the ultimate bass that will hurt your hearing.

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Wiring Schamatics for Coleman 7330 & model6727D709 including Fann Switch two speed for cooling & fan only Two speed.


Check this link, and put your cursor on "technical information". Scroll down & click on wiring or whatever section you require.
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I have a dual XIA3145 580 watt amp that keeps blowing fuses


Generally, this indicates that there's at least one shorted output transistor.

Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still blows the fuses, the amp almost certainly has shorted output transistors and will need to be repaired.

I'd recommend using two 10 amp fuses. The amp will power up with 10 amp fuses if there is no problem. If there is a problem, there's less of a chance of doing more damage by using the 10 amp fuses.

Let me know if you have any other questions.

babin_perry@yahoo.com

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My emachine t2882


Try this : See if you can find your motherboard model number. If so, type it into Google, go to the manufacturers site and download a manual which should have the wiring diagram you require. 
Cheers.

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1 Answer

Amp powers on, no sound from subs


the output is blown. It is in need of service.
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause.

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Wiring my subs to my alpine mrv-1000


did you read your instruction manual. does it says "it could be bridged to other amp"?. you can't make a bridge to amplifier that is not bridgeable. bridging an amp is a way which it is made through transistor type ampilfier by bridging more transistor inside and more voltage is required for bridging.
I don't know if we could do to an IC type amplifier. ask an experts about bridging IC types how to bridge maybe they know how.
and if you had an successful bridging, you may have a problem through your speakers, they may hit hard but you will experience some errors through your speakers and easy to worn.

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Amplifier not working


If the speakers are being driven in or out and remain there when the amp is on, the amplifier likely has shorted output transistors. These are not easily replaced in the Rockford amplifiers that use the MEHSA insulators. Unless you're interested in learning to do this type of work, it should be sent to Rockford for repair.

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