Question about AudioBahn A8000T Car Audio Amplifier

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Protection mode My amp goes into protection mode when I turn it on, but we just replace most of the transistors on one side and everything checks out to be okay. So what else could it be.

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  • Corey Williams Jul 31, 2006

    Could it have fried a sensor in it somewhere

  • Corey Williams Aug 01, 2006

    Where can i get a schematic at, and 1 of the numbers for the part i cant find nowhere to cross-reference it at.

  • Corey Williams Aug 01, 2006

    Where can I get a schematic at, and one of the numbers for the part I cant find nowhere to cross-reference it at.



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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

Posted on Jul 31, 2006


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1 Answer

Shut up stereo protect mode?

Protect mode is on because something in your speaker wiring is wrong, or you have a broken speaker, or it\'s too late and you already fried one or more of the amp\'s output transistors.

You gotta fix the problem. Not remove the safety guard and carry on with a busted machine.

Look for wires touching between the speaker terminals or on the backs of the speakers. If you done a half-ass job of wiring up then this is the most likely cause.

If you can\'t find bad/frayed wiring, then disconnect all the speakers out the back of the amp. Switch the amp on. Does it trip out? If no, that\'s good. Turn up the volume. Is it still okay? If yes, that\'s good. You haven\'t yet killed the output transistors. If it goes in to protect though, ut oh. It\'s Repair Shop Time.

If the amp is okay, then power off and add one speaker. Power on with the volume down. If it trips either at no volume or when you increase the sound, then you got a bad speaker and you just found it. Repeat the process, adding one speaker at a time. Make sure you put Vol to minimum and power off each time before adding the next speaker.

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My ken wood krf v5050d automatically goes back to standby what is the cause

hello! i need help with this, i have the same amp Kenwood KRF-V5050D it seems that it had a short circuit on the speaker terminals, close to the 2 12v relays wich are close to each other and the 2 transistors kia 7812 and kia 7912 was turned black, i have replaced them, and i have disconnect the 2 big IC but the amp still does go in the protection mode, but when i disconnect the 2 transistors kia 7812 and kia 7912 the amp does stay on. i have checked almost everything and it seemed to be good. i have checked every transistor and replaced some capacitors, but i have not replaced the 4 big capacitors, with all the 0.22j resistors and all the terminal relays and the 2 big ic disconnected the amp still goes on protection mode. i had this amp returned from ebay and the buyer is waiting for it to be repaired, i would aprecciate any help.
Kind Regards.

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1 Answer

Stuck in protection mode tried everything voltage good wires good ground good open/close button dosen,t help me at all love amp please help

everything you've tryed is useless(with respect) because amp has shorted output transistors one or more and amp is in protection mode to protect your amp from further damage.take it to repair shop or try to locate blown transistor yourself.good luck

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1 Answer

The amp turns on but goes to protection mode

Have you checked the REM wire, if it is the wiring may have gotten fried.

Or you may need to get new parts replaced within the amp.

Both issues happened to me.

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1 Answer

No sound coming from speakers Blaupunkt GTA470 Amp

Amp Failure:
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. Transistor Failure/Checking Transistors:
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.

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3 Answers

Sony STR-D611 receiver goes into protect mode when turned on.

I cleaned the contacts on the transistors and it's working great now. Previously, I spilled some drink on the unit and it went into protect mode and it was in the power amp section. It's all up and running again. Thanks for the info. --Steve B.

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2 Answers

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The numbers of the transistors thay you need to replaced are on the transistor themselfs. Just take out the bad transistors and get the numbers that you need. I ALWAYS replace the output, driver and bias control transistor myself. One thing to keep in mind, if the number on the transistor starts with "A or B or C or D or K" you need to add "2S" in front of that number when you order it. Now that this problem has repeated itself, double check your wire and speaker. They can cause this problem.

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2 Answers

600w legacy amp

9 times out of 10 if your amplifire is in protect mode and evrything externaly, like speakers, fuse, voltage, etc. checks out fine then
either you have shorted out output transistors or power mosfet transistors. Basicly that just about what happens with car amps.
It's easy enough to fix IF, IF you know what your doing. First you
need to check the output transistors with a digital volt meter on diode check, If they check out then check your power supply mosfet transistors. I can almost guarantee this is your problem. Very common. I buy non working amps all the time and repair them. Listen to pbabin also he has helped me out. Good luck

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Disconnect all speaker wires and signal cables from the amp. If it powers up (no protect light), the wiring needs to be checked. If it still shuts down (goes into protect), the amp likely has blown output transistors.

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