Question about Directed 2150 Car Audio Amplifier

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Amplifier with visual damage

I've aquired an amplifier with considerable (visual) damage. No output. I am trying to find a schematic to troubleshoot. Is there one available?

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It's unlikely that you're going to find a schematic. If this amp uses the defaced ICs marked B52 and F16, it shouldn't be difficult to repair if you have experience doing repair work.

Let me know if you need help with it. If you do, I'll need at least a few photos of it so I can see the overall layout.

Posted on Apr 17, 2008

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Accidently had peaker connect to A side while in bridge mode wud mixer be damaged


Hi, When an two channel (stereo) amplifier is connected in bridge mode the polarity of one channel is reversed, for this example say channel B. An identical (mono) signal is applied to both channel inputs.
The output is now connected between the two channel +ve outputs. As channel A's output goes +ve , channel B's output goes -ve, thus doubling the output voltage.
On this Behringer powered mixer, the bridge switch simply connects the power amp section inputs, the required way.
The bridged output is wired to the B output between pins 1+ and 2+ of the 4 pole Speakon connector. (Because usually pins 1+ and 1- are used, stereo operation is unaffected.)
So.... If you connect a speaker from the A output alone then I would expect it to work, BUT if there is already a speaker connected from the bridge output, then what happens will depend on the amplifier design.
At best the A channel will see too smaller impedance, and hopefully shutdown.
This is a Behringer, it has digital (class D) power amps, and it does Not claim any amplifier protection !!!
If the powered mixer works in normal stereo, then it is probably OK.
If it then does Not work in bridge mode it is likely to be the connector wiring.
All the best.

Apr 07, 2014 | Behringer Pmp4000 Europower 1600-watt...

1 Answer

Yamaha ax440 left channel down


Check both your input(rca) and output connections on the inside of the amp for any looseness or damage, solder connections and so forth.. However I think your power/output transistor(s) are burnt in the left channel

Apr 08, 2013 | Audio Players & Recorders

1 Answer

Carlsbro Bass Reactor 400 bass amp - power section dead


• Could be drive transistor , output transistor or both on the main amp.

But check for power supply and in the preamps also.

• A signal tracer will come in handy when troubleshooting these kind

of symptoms.

• Measure supply voltages,

• Check offset voltage

• Check idling current

Isolate , and trace afterwards.


• Schematic is really needed when there are burnt and unrecognizable

component. But one can use similar schematics to analyze circuit

problem.

Aug 01, 2012 | Audio Players & Recorders

1 Answer

Speaker blow out with 34vts on output of amplifier .checked transistors & drivers ok.can you help me please


Well, this may take some work, but do you have a schematic for the unnamed mystery amplifier?
If so, trace the voltage back to the op-amp chip that's sitting with V+ on it's output with no input, and you`ve found the problem!
Otherwise, if you have an oscilloscope, with no speakers attached, trace the incoming signal until it turns to a DC voltage or til the signal starts riding on a high or low voltage.

Oh, another thing to check, there's usually a couple high wattage low impedance resistors between the power transistors (unless it's a hybrid chip). If one of those resistors opens up, you can have this issue.

Apr 27, 2011 | Audio Players & Recorders

1 Answer

Two redlights on my amp? The battery died on my car, and after jump starting, I'm not sure if my amp is working. Two red lights are on, but I think one of the lights used to be green. All speakers are...


If there is a red light displayed, for this particular amp, then that means the overload circuit has been activated. This is caused by excessive output current. What may have happened is that the passive crossover components have been damaged. If you know how to use a soldering iron, you may be able to visually see the damaged components on the crossover circuit board and repair them. Another possibility is either a speaker cable is exposed and touching the vehicle chassis, or a voice coil has been damaged. The most likely problem is a damaged voice coil, as that would still play music but would require more power to reach the same audio output. Smell the area around each speaker magnet for a burned scent, which would indicate a damaged voice coil. If there is no scent, visually inspect each speaker for damage. If there is nothing visible and you do not smell any burned scent, and you are sure the speaker leads are not exposed and touching the vehicle chassis, then there is probably nothing wrong.

Mar 07, 2011 | Phoenix Gold ZX400ti Car Audio Amplifier

1 Answer

AudioBahn A2300HCT no sound


Generally, if the amplifier smokes, the power supply FETs have failed.

Many times, the output transistors fail and that causes the power supply FETs to fail.

Audiobahn won't release schematics. The amplifiers are relatively simple and a schematic isn't generally required.

If you know how to check the transistors, check them to determine the severity of the damage. If you don't know how to check them, read through the following page following all links provided.

Basic Amplifier Repair

Let me know if you have any other questions.

Sep 04, 2008 | AudioBahn A2300HCT Car Audio Amplifier

1 Answer

P5002 Problem


The schematic is available from Rockford.

It's possible that the outputs have blown. They generally short from the center leg to the third leg when they fail.

Unless you have experience working with the MEHSA insulators, you may want to buy the entire MEHSA strip from Rockford. You can replace the transistors on the insulators but you have to use a torch to heat the strips.

Nov 18, 2007 | Rockford Fosgate Punch P5002 Car Audio...

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