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Output transistors blown

I have a ma audio hk 4000 and it comes on and has good singal showeing 12 volts and good temp but theres no sound comeing out what could b the problem could it b and output transistor and do you know were can i find a scamatic from

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

1drunkhippie
  • 8 Answers

SOURCE: hifonisc bx 1605d

i think you could but before doing that did the amp itself send the output to the line if it did then replacing the parts would be pointless. if it was a hook up problem then replace parts and don't let it happen again

Posted on Dec 15, 2007

  • 3 Answers

SOURCE: MA Audio HK4000D please help me ?

i suggest u look at the spkrs inside the box and see hw they are wire inside the box that could be one your problem[bassmasteraudio@yahoo.ca]

Posted on May 26, 2008

blueextc3221
  • 15935 Answers

SOURCE: my ma audio hk 4000

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.

Posted on Jan 09, 2009

blueextc3221
  • 15935 Answers

SOURCE: ma audio hk 4000d

you have definately blown a output channel, or power supply. Send it in for warranty.

Posted on Jan 09, 2009

etirbynnor
  • 655 Answers

SOURCE: 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.

Posted on Jun 03, 2009

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1 Answer

The 12 volt connection sparks when connected. then not even the protect light comes on. the protect light only comes on when the remote wire is connected and the power wire is not.


The 12 Volts being applied will spark initially. There are large capacitors on the input powers supply rail. Once they charge no more spark. The protect light comes on when you apply remote voltage because you are actually telling the amp to turn on and there is a problem with it like an output transistor is shorted or your power supply could have a problem. Hope this helps.

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1 Answer

My ma audio hk 898 will power on but will not push subs at all what can i do


Hello 76firebirdfo,

If there's no sound at all from the subs and you know they are good, there's probably no output from the amp. It's either wired incorrectly or it is defective.

If there's some sound but just not loud enough, then either the amp is not getting enough of an input signal from your head unit, or the amp settings are not adjusted properly. Adjust the crossover and gains for the best output to subs. LP filter on, crossover frequency at about 80-100Hz, and gain to maximum without distortion when head unit volume is at about 3/4 maximum.

Hope this helps.

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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

Ma audio hk 4000d


you have definately blown a output channel, or power supply. Send it in for warranty.

Jan 09, 2009 | MA Audio HK4000D Car Audio Amplifier

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

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

1 Answer

Power On + red LED turns on + but final relay (click) don't come so no sound


Your audio output transistors are shorted and your unit is staying in "protect " mode to protect your speakers from 40 to 60 volts that is being sent at them from the shorted outputs. If you can use a meter you won't need the schematic MOST likely because the outputs are USUALLY the only parts that short out. The output transistors( or chip ) are mounted to the large, finned heatsink. The #'s on the transistors start with "2SA-" and "2SC-" followed by numbers. There are two output transistors per channel. If your unit uses an IC for audio output then the # on the IC will be "STK-" followed by numbers. These parts are available from tritronicsinc.com. Good Luck!

barneyluc

Oct 17, 2008 | Denon PMA-2000R 2-Channel Amplifier

1 Answer

My marantz sr19ex amplifier has stopped outputting sound


I am working on one right now, it has blown output transistors and several upstream transistors and burned resistors as well. This channel of the amp will need a rebuild.

Use a volt meter and, with black lead on the chassis, check the voltages at the 3 conductor connectors going to the board at the rear speaker terminals. These are the outputs coming from the amp and if there is voltage on any of these (unit at idle, no volume), the protection circuit will keep the output from getting to the speakers. High voltage here means blown amp, most likely.

feel free to contact me regarding the repair... www.irebuildmarantz.com

Aug 27, 2008 | Audio Players & Recorders

2 Answers

MA Audio HK4000D please help me ?


Turn the system off and disconnect the speakers. Turn the system on. If the amp still goes into protection mode with no speakers connected, then most likely the output transistors are bad. If the protection light is off, hook up one sub at a time until you find the one that is causing the problem

May 21, 2008 | MA Audio HK4000D Car Audio Amplifier

1 Answer

My amp light turns on but thares no sound


problem in sound output section,please replace output I.C. or transistor.

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