Question about Kenwood KAC-7202 Car Audio Amplifier

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Kac-7202 with flickering power light

I have a kenwood kac-7202 amplifier with a flickering power light. I also nodiced that the fan speed goes along with the flickering light. I picked it up from a friend and the only thing I knew about it is that it powered up and didn't put out sound. So, I opened her up and I nodiced that the ground trace for the speaker terminal was blown. So, I made the fix, I hooked it up and still no audio. Strangely after hooking up the speakers the power light started to flicker. What I'm thinking is that there is a short some where that is bringing the power supply down but I'm not able to find it. So far I have checked all of the transistors for a short and out of circuit I've checked the zeners that every one is talking about, the supply diodes, a couple of the output transistors and I haven't been able to find anything. Does anyone have a suggestion?

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  • Andrew Hawkins
    Andrew Hawkins Jul 04, 2009

    I have checked pretty much all components for any type of visual defect and even tested them out of circut. I'm still at a dead end here but maybe some time next week I will do more digging into it but it would be great if someone familiar with the problem could lend some advice as to where to start instead of wandering in the dark on the circuit. Thanks for your reply nnowak277

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Did u start simple with checking your connections and after that you have gone in pretty far so did you check the heat sinks and mosfets look for small dents or divits and those ane the bad ones

Posted on Jul 04, 2009

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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.

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