Question about Car Audio & Video

Open Question

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

Posted by on

  • 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.

×

2 Suggested Answers

  • 631 Answers

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Samson SX1200 - Protect light on. No blown output transistors.


Have you checked the power supply section? Also look out for any IC's in the amp stages. They can go causing that kind of fault.

Oct 11, 2014 | Samson SX1200 Amplifier

1 Answer

I have a macro 2400 that needs a chip [c2527]and transistors[d6729-4][c8188-2 I want original parts the transistors in there now are not crown and sounds weak one side is crown and the blown side when it...


Your best way is google for the parts, but you need to add UP in front of the chip code (UPC2527)
and 2S in front of the transistors (2SD & 2SC), to find them.

May 04, 2011 | Crown MA 2402 Amplifier

1 Answer

HI. I've got 2 DECA 724 with one channel blown on each. I will like to fix this amps they have work great for me hate to change this amps.


The DECA amps are nice... As I recall the transistors are not easy to find but they do exist or substitutes are available. I am trying to find a schematic... I have found one that one has to purchase from Musicparts...

Jan 17, 2011 | Music

1 Answer

I need the schematics for a Marshall MG-10KK guitar amplifier in order to repair it! I'm a good technician but I don't speak english very well... rsrs Thanks!


Most of the problems with the small guitar amps are blown power amp chips. They usually use chips like the TDA2030 which look like a power transistor.
Most other problems involve broken connectors, bad solder joints or cracked circuit boards. The power supply area is so simple one doesn't need a schematic for that part which is usually just three terminal regulators for +/-15 volts. Schematics are often hard to find.
Try this site, although this is a different model, much of the schematic will likely be the same.

http://elektrotanya.com/marshall_valvestate10_10w_8001_8010.pdf/download.html

Nov 17, 2010 | Marshall 15 Watt Guitar Amp

1 Answer

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.

Apr 24, 2010 | MA Audio HK401SX Car Audio Amplifier

1 Answer

Noisy left hand power output stage. Noisy transistor? No circuit diagram.


If the speaker is not blown, there must be an output capacitor. If no output capacitor, and you have a blown transistor the speaker will blow from DC current. You can further check the transistors with a multimeter. A transistor looks like 2 diodes and you should be abobe to test with a mulimenter like a diode test.

May 12, 2009 | Audio Players & Recorders

1 Answer

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.

Jan 09, 2009 | MA Audio HK4000D Car Audio Amplifier

4 Answers

ADCOM GFA 5802 POWER AMP NO SOUND, BUT POWERS UP.


Remove the output transistors and measure each of the sets of 3 pads and report the voltage readings here. I suspect that you have either a blown driver circuit or output transistors. The voltage readings will give me an idea on where to start looking for specifics.

Thanks,
Dan

Nov 11, 2008 | Adcom GFA-5802 2-Channel Amplifier

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

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?

Jun 21, 2008 | Cadence A7 HC Car Audio Amplifier

Not finding what you are looking for?
Car Audio & Video Logo

Related Topics:

139 people viewed this question

Ask a Question

Usually answered in minutes!

Top Car Audio & Video Experts

xxxxxx xxx

Level 3 Expert

4807 Answers

yadayada
yadayada

Level 3 Expert

71162 Answers

The Knight
The Knight

Level 3 Expert

73073 Answers

Are you a Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...