Question about Kenwood KAC-7202 Car Audio Amplifier

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Kac-7202 hey bowdown.. i see that you were trying to help someone fix an amp .. it looks like you would be the right person to help me (pleasee) well i have a kac 7202 and when i installed it ... lyke an idiot i decided to put the sensitivity to blast and put the bass boost on all.. it was bumping hard.. i also bridged it .. sooner or later the amp gave out.. now the amp just turns on very quickly for about a second den turns off.. power runs thru it but not all the time ... i opened it up and couldn't tell wat was burned im able to send pictures and i can follow your directions :D thanks man

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  • rx7srlife Jun 15, 2008

    I have the same problem. I aquired the amp second hand because it would not power up. I could really use the amp, but it wont work. What do the output transistors look like? Where are they located? and where can I get new ones to solder in?

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I had a similar problem, bought a KAC-7202 from e-bay to repair cause it's what I do and this amp had me stumped until I came across another guy who has the same problem and he took his to a shop and they said it was some diodes. Since my next step was to check diodes thats what it was. 1 bad zener diode 1ss133 diode d9. So any body having a problem with the 7202 the amp fan is the only thinf that comes on, no lights then it's most likely a diode, a zener diode. The little orange colored with a coloered striped at one end.

Posted on Feb 09, 2009

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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.

Posted on Apr 26, 2008

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