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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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.

May 08, 2011 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

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

Sep 04, 2009 | Dual Electronics illumiNITE XIA3145 Car...

1 Answer

The amp is on lock mode and i do not know how to take it off


Hello, Could you please specify what type of clarion amp you have and what happend prior to the problem? I don't know what you mean by lock mode unless it has some security feature or you mean it's in protect mode. If it's in protect mode more thanlikely you have power supply mosfets shorted or output transistors shorted. If all wiring and speakers are good and your head unit. Let me know.

Aug 25, 2009 | Clarion Car Audio & Video

1 Answer

Output transistor is out in car amp


Hello nymnym999,

You did not specify which Fusion amp you have but if the insides looks like the Fusion PP-AM60020 image below, you'll have to "desolder" the transistor.

8e329a2.jpg
First remove the heat sink from the transistor case. You'll need a controlled heat soldering station, a desoldering vacuum tool commonly referred to as a "solder ******", and some desoldering braid. Be careful with the heat around other components.

After removing the transistor, use the desoldering braid to clean off any remaining solder from around and in the circuit board mounting holes. Position the new transistor and solder it to the board. Put a thin film of thermal compound on the heat sink and remount it to the new transistor. Use just enough of the compound to insure an air-free join between the transistor case and the heat sink. Reassemble the case and you're finished.

Hope this helps.

Jun 03, 2009 | JBL BP300.1 PowerValve Series Car Audio...

1 Answer

401s Rockford Fosgate Amp. Not turning on. No power light. Pos+ and GR- are solid. Thought it may be remote, so tried running a wire from the POS+ to REM to test it, no luck


Amp Failure:
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. If the fuse protecting the amp is too large, if the protection circuit doesn't respond quickly enough or if the power supply is poorly designed, the power supply transistors may fail. If you see a lot of black soot on the power supply transistors (near the power transformer), the power supply transistors have failed. Soot on the board doesn't necessarily mean the transistors have failed. Sometimes, technicians don't clean up the mess from a previous failure. Transistor Failure/Checking Transistors:
In general, when a transistor fails, it will either short (common for output AND power supply transistors) or open (common for power supply transistors). Transistors act like valves. They control the current flowing through a circuit. A shorted transistor acts like a valve that's stuck open (passing too much current). In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. If you've ever seen a damaged amp that pushed or pulled the speaker cone to its limits when the amp powered up (common on some Rockford amplifiers), that was almost certainly due to a shorted output transistor. When checking transistors, you most commonly look for shorted connections inside the transistor. You do this by using a multimeter to look for low resistance connections between the transistor's terminals. Note:
I used the terms short and open on the previous paragraph. A short (short circuit) is a path through which current flows that should not be there. An open (open circuit) is a break in the circuit.

These repairs are best left to a repair tech familiar with car audio amplifiers. Check with your local shop to get a reccomendation. If the light isnt even coming on, chances are your input or power supply has been taken out.

Jan 01, 2009 | Rockford Fosgate Punch 401S Car Audio...

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.

Dec 28, 2008 | Alpine MRD-M1005 Car Audio Amplifier

2 Answers

Amp powers up (switchable) but has absolutely no output


If possible return the amp to the seller for a refund (before you tamper with it).

If that's not possible, the amp will need to be repaired. Do you want to try to repair it yourself?




For the head unit, you need to check the shield ground first. The following page will show you how to perform the test.

Shield Ground Test/Repair

Let me know if you have any other questions.

Sep 19, 2008 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Ultra linear ul-600hc


If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following. I'll assume that you've checked the amplifier's on-board fuses.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

If the voltage remains near or above 12v, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp almost certainly has shorted output transistors and will need to be repaired.

Let me know if you have any other questions.

Aug 26, 2008 | Ultra Linear UL-600HC Car Audio Amplifier

2 Answers

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.

Jan 22, 2008 | Pioneer GM-X962 Car Audio Amplifier

3 Answers

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.

Sep 09, 2007 | Rockford Fosgate P3001 Car Audio Amplifier

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