Question about Kenwood KAC-7202 Car Audio Amplifier

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Power and protect Problems

Amp powers on only about half the time and when it does power on it stays in protect mode. I thought it could be the mosfets but I don't know much about all that stuff.

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  • stev3419 May 03, 2010

    I have connected this amp just like I do Amy other one it just doesn't want to work. I have a vr3 200 watt amp that I hook up and it works great. But when I hook up the keenwood the same exact way it just don't do anything other than power on and protect or turn on then off.

  • uno_1 May 11, 2010

    have you check to make sure your ground connection is clean and solid? if you speaker is partially blown it can cause this to happen, your amp may be fine...



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Check your ground wire.

Posted on May 03, 2010


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It is normal for them to go into the protect mode, If the speakers are not hooked up to it,

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I have an xterminator xt2000d amplifier which is stuck on protection mode. It keeps on trying to switch over to full power but stays in protection mode. I unplugged speakers same thing replace fusses same...

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Autotek XS-900.4 stuck in protect mode


The amp does not go on protection only because of wiring or power source problem , but also and mainly when there is an internal fault.

Protection is started whenever an out-of range voltage value is detected from the controller circuit.

Protection can be triggered from a burnt final IC or from a speaker wiring problem.

Since you have ruled out speake, wiring and power source problems, then this Amp is probably defective

If the Amp works fine on a different vehicle, then protection mode may start either because speakers impedance is not within Amp specs, or because the amp has a too big power draw. In this last case the problem is fixed installing a capacitor on the Amp 12V line.



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My 4 channel amp keeps going into protect mode when i power on,its not a imminet light,but it blinks once then dies out,plz help

Remove all speaker inputs and outs and just have your 12volt battery, ground and radio remote connected and power up the amp. If it turns red instantly, then the amp is shorted/blown. If it stays green, then install your speaker inputs and outs one at a time. make sure your amp is on while your doing this. if the amp goes into protect mode, take note of which wire it was for it's most likely shorted. Fix that shorted wire and the unit should stay on.

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protect mode usaully means that something has disrupted the power of feed lines to the subwoofer/speakers possibly fuse is blown in amp or amp is blown in which we hope not. see if you have a warrenty if blown and send back or bring it to where you purchased it from.

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Why does my amp stay in protect mode?

The most common reason an amplifier goes into or remains in protect mode is shorted output transistors. To eliminate other possible reasons for it to go into protect, read the following page.

Troubleshooting - Amp in Protect Mode

Aug 03, 2008 | DHD NTX-2139 Car Audio Amplifier

1 Answer

Problems with power

Hi sexybeautyed

The unit is going into protection mode. It has an internal fault that is forcing the unit to shut down to protect your speakers, and the amps internals to a degree. It is not something that can be easily diagnosed here. If it is a decent amp. then you may want to get a tech to take a look at it for you. If it is more than half the replacement cost of another amp, then it is not an economic repair job to do. UNLESS it is collectable/ What make and model is it? I could advise you. :)


Jun 24, 2008 | Kenwood Audio Players & Recorders

1 Answer


Since I do not have the amp opened up on the test bench and connected to be able to take readings, I can only speculate.

It is obvious by your description that the amp is going in to protection mode. It is possible that the total impedance is too low, or that the amp is being over driven.

If there is some distortion occuring especialy at a high level, the amp should go in to protection mode. It is also possible to have some defective components that are making the amp too sensitive to go in to protection mode. I have also seen defective components intermaly in amplifier units that have caused the power supply to go in to the protect mode.

I have seen defective crossovers in speaker units also cause an amplifier to go in to protection, or even be damaged. If the crossover has the type of defect that is causing an impedance missmatch or be in a low resistance, this can cause the amplifier to go in to protection.

You will need an experienced tech who knows the model of amp very well, has the instruments, and has the service mauals in order to be able to go through it to find the exact fault.

Considering the circumstances, this is the best I can do for you.

Jerry G.

Jun 11, 2008 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

Amp staying in protection mode

No, this amp is not a heavy power consumer- matter of fact it takes very little power to run.Maybe you should check the fuses on the amp to see if they are what is recommended.Also check your fuse kit to your amp- your fuse might not be big enough.If neither works take it back where u got it.

Jan 01, 2007 | Soundstream XTA880.2 Car Audio Amplifier

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