Hi, I've had this Kenwood KAC 7202 amp close a year. I disconnected it and put it away for about 2 days because my trunk latch broke. All i did was disconnect the subwoofer, power, grnd, the remote wire...(blue one) and the spkr wire that hooks to the sub...and i also disconnected the power cable from the battery...then when i decided to put it back on..the little red light wouldnt come on. so now i dont know what to do...i've tested the wires to the best of my ability and it says 12v....i also aquired a new fuse and fuse housing...dont know if that is what's making it not turn on/function properly...please help im going insane without my sub and amp:( thanks for ur time
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.
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To everyboby who has a problem with the Kenwood KAC-7202, the light will not come on, the fan spins but thats it. Everything else checks out fine, transistors, fuses, any visual problems. What I found it to be is the zener diodes over by the fuses, next to the two chokes or load coils. There are 3 or 4 zener diodes over there, I can't remember if 3 or 4 and it was just yesterday that I fixed mine.
Anyway I found one bad zener diode that was bad, one tiny little diode was keeping the amp from turning on. I allready wrote, Check these zener diodes with a volt meter on diode check, you should only get a reading measuring oneway if you turn the leads on your meter around and get a reading then that is one or one of 3 or 4 that could be bad. Probably like mine, one was bad. Replace the bad zener diode and amp will work fine as mine works great now. I bought this amp broken to begin with, it's what I do and I'll tell ya, this amp almost had me. This is the problem with everybodies amp that only the fan works and no light and everything else checks out fine.
Also to everyone this helps, please rate my solution so I can get out of this apprentice status. Thanks
This solution was very helpful. My kac7202 had the exact same issue. I found two of the diodes bad. I found replacements in an old VCR. After soldering them in I tested them and the new diodes are giving me the same reading. Now I'm confused. Do you have a solution?
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When your amp is something of 1000 watt it need a fuse of 25A.your amp power connection have a +12v,ground and remote.remote and +12 you must connect to your battery +.ground on your body.any amp needs a power of no less than 25A
With...
the head unit on
the black meter lead on the ground terminal of the amp
the meter set to DC volts...
Do you read ~12v on BOTH the remote and B+ terminals?
Are the fuses in the amp blown?
If your speakers are wired for an impedance below 4 ohms mono or 2 ohms stereo, that would make it shut off. If you have a speaker wire shorted to ground, it would also cause the amp to go into protection.
If the speakers are not the problem, it may be shutting down because the voltage at the amp is dropping too low.
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THE RED LIGHT WILL NOT COME ON
I have had the Kenwood kac 7202 amp for about 1 1/2 years and the other day the red light went out on mine also. I checked all fuses and wires and I don't seem to ahve a problem there. What do you think it could be? Anyone????
Same problem. Bought the amp to repair along with others and I fixed 6 out of 7 and this kenwood kac-7202 gots me stumped. I have a degree in electronics, but like I said in my other post, this amp has got me stumped cause all transistors check out fine, output and power mosfets transistors. I'm thinking diodes now. Zener diodes maybe since I had an amp do this same thing kind of and it turned out to be one bad zener diode on an infinity 7541a.
I checked those diodes out and you are right skinnman33
thats what it was. Thanks for the info.
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