Question about Kenwood KAC-5203 Car Audio Amplifier

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It jus turns off an i can't figure out y?

When i go 2 hook up the power 2 the amp the littlle red light comes on for a sec then goes back off an i had't figured out why?????

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Re: it jus turns off an i can't figure out y?

Disconnect the speaker wires and signal cables from the amp and measure the voltage across the power and ground terminals with a multimeter.

With the black meter lead on the ground terminal of the amp and the red meter lead on the B+ terminal of the amp, the voltage should remain at or above 11 volts.

With the black lead again on the ground terminal of the amplifier and the red lead on the remote terminal of the amp, the voltage should again remain at or above 11 volts.

Posted on Oct 29, 2007

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Well, I have no idea why you would have two capacitors on a 500 watt amp but, did you charge the capacitors? Have you tried the amp without the capacitors? What size power wire are you using?

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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.

Let me know what you find out.

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It sounds like the output transistors have failed. Disconnect everything from the amp except for the B+, ground and remote and turn the amp on. If it goes into protect, the amp is in need of repair. If you want to repair it yourself, email power acoustic for the schematic.

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