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I need a schematic for an MA 744C amp from Majestic. It has some blown transistors that I would like to fix.

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  • Alvin Barnabas
    Alvin Barnabas May 11, 2010

    On the back of the amp, on the label, where was to amp manufactured. If the is an address call info an get a number. If made outside of the USA, it going to be tough to find. did you get any type of manual or cd with the amp.

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SOURCE: Have a a7 Hc... Blown transistors.. Shematic diagram??

What are the part numbers on the transistors you replaced?

Did you replace transistors in the output section and the power supply section?

Does this amp have the defaced ICs labeled B52 and F16?

Posted on Jun 23, 2008

Zackd9184
  • 56 Answers

SOURCE: wiring installation on Majestic amplifier total 60watts 2x30 model# ma-60

To install the amp you need a amp wiring kit they range from $15 and up depends on how many watts u have.Once you have the wiring kit start with the ground wire it needs to be no longer then 24 inches long the shorter the better find a good ground in the trunk or where ever you want to install the amp make sure its metal to metal no plastic paint or any other debrie is in the way of the metal.If you can't find a paint free surface all you will need to do to fix this is sand off some of the paint and then ground the amp.The ground wire needs to be connected to the amp before any other wire once you have the ground connected then connect the battary wire make sure you have the right size inline fuse on the battary wire that also depends on the watts of the amp.once you have those 2 wires connected then u will need to pull the stereo out of the dash and hook up the remote wire to the power antanna wire if you have a factory car stereo and don't have a power antanna you can try one of these solutions 1st one Run the remote wire from the battary wire on the amp and use a toggle switch between the remote and battary wire or you can run the remote wire from the amp to the fuse box of the car and hook it up to a fuse that only works when the key is turned on.Once you have all this hooked up its time to hook up the subs/speakers on the amp it should indicate if its bridgable it will show lines from one positive and one negative and at the top of the lines it will say bridge but if not the just connect the speakers positive to positve and negative to negative.If it is a bridgeable amp i would only recommend hooking it up bridged if you are hook up subs if you are using 6x9's on the amp you don't need to bridge the amp.If u have any more ?'s just ask i can help with this i've done this alot.

Posted on Oct 11, 2008

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1 Answer

No power


For what amp, a Home stereo amp or a car stereo amp? Most car amps will not have internal fuses, but home stereo amps do have internal fuses. You will notice on car audio amps fuses are always plugged into the side of the amps or they have an inline fuse that is on the main power wire into it.
You have more than likely blown a Mosfet Power Transistor, very common in car amps, I'm fixing 3 of them right now with that problem. Class "D" Amps seem to have this problem on a regular basis and they are hard to get working again once they blow. You won't even see any evidence of the bad parts inside the amp either, old amps will fill your car with thick smoke and will have obvious damaged parts. Best bet is you will be looking at buying a new amp unless you paid over $500 dollars for it, it's not worth fixing, check the warranty to have it replaced by the manufacturer.

Apr 02, 2013 | Car Amplifiers

1 Answer

No power after i unhooked the wire from amp, left wire uncovered at ends for couple days tried hooking them back up and no power now. is amp blown


if you unhooked the wire from the amp while the amp was on, you may have possibly blown a fuse, or mayb a transistor or compacitor inside the amp! easy fix, just find new transistors and compacitors and soilder them on after removing old ones!

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Amp is in protect mode


If you have'nt fixed your amp by now I thought I'd tell ya a couple of things why it's going into protect. The basics. Blown subs, bad power suply or mosfets, and blown output transistors/mosfets. Still need help let me know. I repair amps for a living and i'm the cheapest you'll find and honest. I also give the longest warranty. I'm tired of other people rippin people off on repairs. Let me know.

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missmatched impedance, insufficient ground, blown transistor.

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My ma audio hk 4000 amp is powered on no sound coming thru subs amps brand new


If there is no protection light on, be sure the input is on. Some head units need to be turned on manually (factory set to OFF).
Verify the subwoofers are wired properly.
A list of your components would help to solve your problem.
If it is new, it should still be under warranty - worst case scenario output transistor(s) blown, or power supply bad.

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Blown resistior in a hifonics brutus bxi 1606d


If you can point it to me in the schematic diagram I might be able to help you. But I suggest you bring it to a qualified audio electronic technician if you still value it. cheers!

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1 Answer

Transistors


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

Jul 31, 2008 | Majestic MA4200R Car Audio Amplifier

1 Answer

ZX-8100


I'm not familiar with that particular amp but generally, the only transistors that burn are the ones in the power supply. If the adjacent transistors had numbers like IRFZ44, IRF3205 or similar, the burned transistor is likely the same as the ones next to it.

Confirm that the center and right-most leg of the burned transistor and the transistor next to it are directly connected by large traces on the circuit board. Also confirm that the center leg goes to the large windings of the power transformer. If it passes these tests, the transistor is one of the power supply FETs. The numbers on the adjacent (parallel connected) parts will be the same as the burned one.

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2 Answers

Have a a7 Hc... Blown transistors.. Shematic diagram??


What are the part numbers on the transistors you replaced?

Did you replace transistors in the output section and the power supply section?

Does this amp have the defaced ICs labeled B52 and F16?

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