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Re: my sons kac 848 amp just stopped working
There is an Internal Fuse on Most of these Models that will blow from time to time. You might also check the Ground Connection. A loose Ground can cause the Same Problem. Please Rate My Response! Thanks!
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If the light is out, it's not getting power or is in protect mode to prevent further damage. If you have a voltmeter, measure the voltage between GND and 12V (BAT terminal) and also between GND and REM terminal (with the car and radio on).
If neither has voltage, your ground wire has come loose. If the bat terminal has no voltage, your fuse under the hood is blown (they can blow and still look fine sometimes) or your power wire is loose or broken. If the REM terminal has no power, your wire is broke or has come loose from the back of the stereo.
If I had to guess by touching the positive and the negative terminals together it probably fried up the transistors. While back I did the same to my amp and poof amp no longer worked. Took the amp apart to find the transistors fried up. Ordered them from the manufacturer but never installed them, ended up buying a new amp. Mainly, replacing the amp doesn't mean it would fix the problem....
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.
It sounds like the amplifier is going into protection mode. This is generally due to shorted output transistors but can also be caused by shorted wiring. Disconnect all of the speaker wires and signal cables from the amp. If it still does the same thing, confirm that you have adequate voltage across the B+ and ground terminals (at least 11 volts DC). If the votlage acrosss the terminals is OK and the light still flashes with no speakers connected to it, the amplifier is in need of repair.