Question about Kenwood KAC-7202 Car Audio Amplifier

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Kenwood KAC-7202 wont turn on

Hi, I've had this Kenwood KAC 7202 amp close a year. I disconnected it and put it away for about 2 days because my trunk latch broke. All i did was disconnect the subwoofer, power, grnd, the remote wire...(blue one) and the spkr wire that hooks to the sub...and i also disconnected the power cable from the battery...then when i decided to put it back on..the little red light wouldnt come on. so now i dont know what to do...i've tested the wires to the best of my ability and it says 12v....i also aquired a new fuse and fuse housing...dont know if that is what's making it not turn on/function properly...please help im going insane without my sub and amp:( thanks for ur time

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  • Anonymous Apr 23, 2008

    THE RED LIGHT WILL NOT COME ON

  • rick32 May 07, 2008

    I have had the Kenwood kac 7202 amp for about 1 1/2 years and the other day the red light went out on mine also. I checked all fuses and wires and I don't seem to ahve a problem there. What do you think it could be? Anyone????

  • Mark Skinner Feb 09, 2009

    Same problem. Bought the amp to repair along with others and I fixed 6 out of 7 and this kenwood kac-7202 gots me stumped. I have a degree in electronics, but like I said in my other post, this amp has got me stumped cause all transistors check out fine, output and power mosfets transistors. I'm thinking diodes now. Zener diodes maybe since I had an amp do this same thing kind of and it turned out to be one bad zener diode on an infinity 7541a.

  • Anonymous Feb 10, 2009

    I checked those diodes out and you are right skinnman33

    thats what it was. Thanks for the info.

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I have found the problem to my Kenwood KAC-7202. The amps fan was the only thing that would come on thats it. So I started checkin zener diodes cause all transistors checked out fine. So I remember readinf about a guy that had same problem and took it to a shop and they said it was some diodes. Well, thats what I was thinkin or the transformer. It turned out that 1 zener diode was no good, diode D9 1ss133. I took a zener out of an old vcr I use for parts and put it in and the fan came on as usual then the red light. Then I hooked my mp3 player to the rca input and hooked up some speakers and it works great. Hope this helps you other guys with the same problem. Check your zener diodes with a digital volt meter, if you get any measurement other than the reverse impedance which will read between 600 and 1200 ohms some lower or higher and then reverse the leads on your meter and if you get any reading it's no good and the reading will be 0-50 cause mine read 047 ohms.

Posted on Feb 09, 2009

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  • Mark Skinner Feb 10, 2009

    To everyboby who has a problem with the Kenwood KAC-7202, the light will not come on, the fan spins but thats it. Everything else checks out fine, transistors, fuses, any visual problems. What I found it to be is the zener diodes over by the fuses, next to the two chokes or load coils. There are 3 or 4 zener diodes over there, I can't remember if 3 or 4 and it was just yesterday that I fixed mine.

    Anyway I found one bad zener diode that was bad, one tiny little diode was keeping the amp from turning on. I allready wrote, Check these zener diodes with a volt meter on diode check, you should only get a reading measuring oneway if you turn the leads on your meter around and get a reading then that is one or one of 3 or 4 that could be bad. Probably like mine, one was bad. Replace the bad zener diode and amp will work fine as mine works great now. I bought this amp broken to begin with, it's what I do and I'll tell ya, this amp almost had me. This is the problem with everybodies amp that only the fan works and no light and everything else checks out fine.

  • Mark Skinner Feb 10, 2009

    Also to everyone this helps, please rate my solution so I can get out of this apprentice status. Thanks

  • skeskrt
    skeskrt Dec 03, 2012

    This solution was very helpful. My kac7202 had the exact same issue. I found two of the diodes bad. I found replacements in an old VCR. After soldering them in I tested them and the new diodes are giving me the same reading. Now I'm confused. Do you have a solution?

  • Mark Skinner Dec 03, 2012

    To skeskrt: I own a small business installing and repairing car audio equipment. I have 2 degrees in electronics and designed and selling 2 mono block car amps. I have over 17 years experience with car audio amplifires and home audio equipment repair. If you want some one on one help, I help people who contact me with problems they can't figure out in my off time. Perry Babbin in my opinion is one of the greatest car audio amp repair guru's around so if anything you read about what he's written, it's correct. Anyway, contact me at ampman37@gmail.com My name is Mark and my business name is Mark's Car Audio & Amp Repair hours are Mon-Fri 9am-6pm & Sat. 10:30am-3:30pm Phone is 727-247-5779. Anyone needing a repair or help are welcome to contact me. I am the cheapest amp repair in the USA. No one has or will ever beat my costs for repair and I offer warranties, some different than other amps that I repair. Thank you.

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When your amp is something of 1000 watt it need a fuse of 25A.your amp power connection have a +12v,ground and remote.remote and +12 you must connect to your battery +.ground on your body.any amp needs a power of no less than 25A

Posted on Dec 24, 2012

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With...
the head unit on
the black meter lead on the ground terminal of the amp
the meter set to DC volts...

Do you read ~12v on BOTH the remote and B+ terminals?

Are the fuses in the amp blown?

Posted on Feb 09, 2008

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1 Answer

KAC-7202 will not put out sound. Put in other amp works.


When you switch on the amp did the main amp ic produce heat. If does not change the main amp ic.

Feb 13, 2009 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

KAC-7202 Major feedback after a few minutes of running.


you might try unplugging the wires from the sub, turn it back on with the wires disconnected- if the noise comes back the amp is probably bad - if the noise doesn'tcome back -turn your head unit off and reconnect the sub- if the noise comes then your sub's voice coil could be shorted- if the noise comes back you should try a different speaker to compare- if the noise still there with the test speaker your problem is definately the amp.
If these suggestions don't help please e-mail me at Merle840@aol.com i will be glad to help. Please give me a good rating if i have been able to help you M. MERLE

Oct 12, 2008 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Kac-7201


Check the zener diodes over by the fuses, where the 2 chokes or load coils are. TThere are 3 or 4 Of the diodes, they are zener diodes. I had the same problem and found it to be one bad zener diode. Check my solution out on the 7202, same thing.

Sep 17, 2008 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Kenwood kac-7202


Nope it's not a high-to-low level converter problem, it's most likely a problem with one of two things. 1) either you've blown the output stage in the amplifier, or 2) you've hooked up your subs wrong and your amp is seeing to low of an impedance. The amp is supposed to be 1ohm stable, but we had the same problem. When the indicator light goes red it means that the amp has gone into protection mode, now you have to figure out why. If something in the amp goes bad or just disconnects from the board it will cause power protection mode. If you fry something on the board because you are running the amp to hard or at the wrong impedance it will go into thermal protection mode, however there's no simple way to figure out which has happened.

Have you tried hooking up some different subs to see if the problem remains? try this. If the problem no longer happens then you know it's your subs, if it does still happen then you'll know it's an internal problem.

Years ago I had a Kenwood KAC-821; long story short, I melted the main power wire right off of the board, everytime I turned the system up the amp would shut down.

Take you amp to an authorized dealer and have them bench test it for you.

Let me know what you find out.

Jul 14, 2008 | Kenwood KAC-7202 Car Audio Amplifier

2 Answers

Kac-7202


Since you haven't received a response, I'll try to help you through the troubleshooting. The amp probably has shorted output transistors but before you start checking components, you need to 'confirm' that you have no bad connections in the power line.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage goes below ~11 volts when the amp shuts off, you need to check the wiring feeding whichever line is too low.

If the voltage remains near or above 12v, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up normally, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

Let me know what you find.

Apr 24, 2008 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Kenwood kac-7202 amp


150/ch into 4 ohms
230/ch into 2 ohms

Spec Sheet

Jan 11, 2008 | Jensen XA2150 Car Audio Amplifier

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Kenwood 7202 Amp that is blowing fuses


If your speakers are wired for an impedance below 4 ohms mono or 2 ohms stereo, that would make it shut off. If you have a speaker wire shorted to ground, it would also cause the amp to go into protection.

 

If the speakers are not the problem, it may be shutting down because the voltage at the amp is dropping too low.

 

Oct 19, 2007 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Off and On at mid and high volumes


sounds like you have a problem with your grounding on you amplifier. check for shorts on your amplifier and the place where you have it grounded. (or check the power wire also.)

Nov 01, 2006 | Kenwood KAC-7202 Car Audio Amplifier

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