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A kenwood amp KAC-7202 comes on red light on top on but no sound what could be wrong

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There could be several problems. The following page should help youdetermine if you have a problem with the amp or something connected tothe amp.

Amplifier in Protection Mode - Troubleshooting

Posted on Dec 17, 2008

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Hi and welcome to FixYa,

Initially, that would indicate that the built-in protection system has kicked in. This prevents the system to completely power on and thus damage more parts inside including the speakers.

More often, the problem would be with the power outputs shorting while in some instances would extend even to the pre-amp section. Still in other cases, it could be a software glitch and you can try doing a reset by unplugging from the mains for an extended period and try again. it may also help to do a continuity check on the speakers to determine that they are not the culprits.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 17, 2008

  • Louie  Role
    Louie Role Dec 17, 2008

    Incidentally, the mains in this case would be the main power from the battery and the trigger from the head unit.

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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.

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