Question about AudioBahn A2301Q Car Audio Amplifier

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AudioBahn A2301Q When the amp. powers up it goes into protect mode. I've tested the transistors (red lead on the base and black to C & E, for PNP). From B to C, open lead and from B to E .134 volts. For the NPN, B to C, .475v and B to E is .134v. Both sets read the same thing so I dont think I'm doing it right?

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  • Richard Robb
    Richard Robb May 11, 2010

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On the following page, go to the section labeled 'Checking Bipolar Transistors'. Under the two images, you will find a link to a form that will allow you to enter all of the values with the various lead configurations. Follow the instructions and send me the zipped file with the images. There's a link for my email address. Testing results are more definitive when the transistors are out of the board but initial testing in the board is reasonably reliable.

Checking Transistors

Posted on Jun 16, 2008

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I have a dub2502 amp with the red protection light on and will not go off. The amp is a 1100 watt peak amp @ 4 ohms and my sub is an Audiobahn 1100 watt peak, 4 ohm. wired perfectly. so how do I fix the...


The unit will need to be repaired by a technician. Most likely you have a bad transistor that is causing the protect mode to turn on. The only way to get the protect mode to turn off is to remove the bad part.

May 04, 2010 | AudioBahn DUB Mag Audio DUB2502 Car Audio...

2 Answers

Power up problem with alesis rs300 (ra300)


you have more than likely damaged some transistors.
the resistors have burned because of excessive current.
there are 2 typesof transistors,bipolar and mosfet
a bipolar transistor has 3 pins.1) base 2)emitter 3)collector.
an NPN is tested with the + meter lead on the base , and a PNP transistor with the - lead on the base.
TESTING
base to collector should read .5 to .6 v drop in one direction and open in the other with a digital meter on the diode check function.
base to emitter about the same,but slightly higher than the collector.
if base to collector is .5v then base to emitter is .52 or so.it is always higher than the base collector number.
between emitter and collector will read open in both directions.
if there is a short on any lead combination,the transistor is blown.
npn transistors operate on the positive rail power supply,and pnp on the negative rail.
typically a 150 watt amp will run + - 65vdc.
the transistors running on the plus side are npn and on the negative pnp.
most pnp output transistors are green.,but some are black,
so we must go by the numbers on the transistors, eg.A1076 is a pnp,B755 is a pnp and all transistors that have a C or D eg. D424 are NPN transistors. all A and B numbers are PNP and all C and D numbers are NPN.
MOSFET transistors have 3 pins 1)gate 2)drain 3)source
the source goes to power like the collector does. the drain is like the emitter,and the gate switches it on like the base does.
testing a mosfet is a different procedure.
a mosfet with k then a number e.g. k135 is a positive device like npn.
a mosfet with j and a number e.g. J50 is a negative device like pnp.
a mosfet reads open source to drain both directions.
for a positive (k number device) the plus meter lead goes on the source.,the black meter lead on the drain. on the diode test function.
jump a wire from the source to the gate for 1/2 second and remove the jumper while leaving the other two meter leads connected to the source and drain.The mosfet should switch on and the meter should show a short.that means the mosfet switched on.About 5 seconds later,the resistance from drain to source should go open.
for a p channel mosfet,it checks the same,except that the black meter lead goes on the source and gate .
a mosfet will stay switched on longer than the voltage applied to the gate,if it is driving a high impedance device such as a meter.
a bipolar transistor will not stay on when voltage is removed from the base lead.
i hope this has been of some help.

Sep 09, 2009 | Alesis RA-150 Amplifier

1 Answer

T1500-1bd burnt mosfet


First of all is the mosfet your talking about in the output section or in the power supply section? Most car amps use mosfets in the power supply section, some use them in the output section. To test the transistors in your amp, take a digital volt meter and set it to diode check. Then take the leads and put them accross the first and third legs of the transistors. Usally the red test lead on the first leg and black test lead on the third leg of transistor. If you get a reading of 000 then transistor is shorted. If you get a reading below 600 then transistor is on it's way out if not allready or it's next to a shorted transistor that is it's complimentry output transistor. comonly you will have 2 transistors working together, one NPN and one PNP per a channel, or 4 of them in a bridged type output circuit depending on the watts and how man channels your amp has. I was just looking at the specs of this amp and it's got me confused. It says it's a 2 channel but looking at all the info on different pages it says at 4ohm:200wattsx4 and at 2ohms:300wattsx4 and 1 channel mono 600watts into 4ohms. weird for a 2 channel. anyway that is how you test your transistors. Same way for the power supply section but, you will come accross a couple or more switching diodes that look like transistors and you will get a 000 reading when you test those like I specified. They rarely go out and most of the time there is only 2 of them. They will have a diagram like a diode on the front showing you which way the power flows. Let me know what you find out. Your amp should have went to protect mode if you smoked a mosfet.

Feb 08, 2009 | Audiofonics ADF-243 Car Audio Amplifier

1 Answer

I have an audiobahn A8000t amp with the protection light on


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.
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.

Dec 30, 2008 | AudioBahn A8000T Car Audio Amplifier

1 Answer

Audiobahn a8000t problem


If the protect LED is lit, the amp probably has shortedoutput transistors. To eliminate other possible causes, read throughthe following page:

Amp in Protect Mode - Troubleshooting

Let me know if you have any other questions.

Nov 23, 2008 | AudioBahn A8000T Car Audio Amplifier

1 Answer

Audiobahn DUB Mag Audio 2502 Amplifier


If the protection light is on, the amplifier likely has shorted output transistors. To eliminate other possible causes, read through the following page.

Amp in Protect Mode - Troubleshooting

Let me know if you have any other questions.

Aug 07, 2008 | AudioBahn DUB Mag Audio DUB2502 Car Audio...

1 Answer

AudioBahn A2301Q Car Audio Amp


For the most common problems, a schematic diagram isn't required. What does the amp do when you power it up?

If you're new to repair work, read through the following page. It will guide you through the most common types of repairs.

Basic Repair Primer

Let me know if you have any other questions.

Jun 14, 2008 | AudioBahn A2301Q Car Audio Amplifier

1 Answer

Audiobahn A2301Q amp, charred RCA wires


If the amp goes into protect with the wires unplugged from the board, the amp likely has more serious problems. It may have a shorted power transformer and almost certainly has shorted output transistors. If you think you may want to try to repair it yourself, read through the following page (particularly the information in the yellow box). Respond to this post if you have more questions.

Basic Repair Primer

Jun 08, 2008 | AudioBahn A2301Q Car Audio Amplifier

1 Answer

Protection mode


Driver ICs or transistors,op-amps that create the idle bias circuit,the protection circuit, the power supply. You should have a schematic of this unit and know how to check the solid state devices for shorts. GOOD lUCK

Jul 31, 2006 | AudioBahn A8000T Car Audio Amplifier

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