Constant redlight protect mode now. had hooked up a bad speaker.
Bad speaker is disconnected, went to trash. have checked all trans,diodes and zener diodes all check good with huntron.have found one ic lm837n 2nd pin is shorted or close (vertical line)(diff) than the other lm837n's and possible q79 and cr7 trans bad. wheres protection circuit located? are schematics available?
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If you have a volt meter you may try and repair it yourself. First however disconnect the speakers and see if the set still goes into protect. If so you may have shorted output and drive transistors. There will be open resistors near them as well. You can compare the bad channel with a nearby working channel since normally only channel shorts out at a time. Always replace outputs in pairs since they in push pull configuration .
Hello Disconnect all the output wirings. Just supply the amp itself, and switch it ON. If it doesn't show any protection, make sure that the wiring to speakers have some short in between car chasis. check them, by connecting one by one, and find out which one makes the trouble. Cehck it well. If the amp does show protection even after disconnecting all the outputs, make sure that the internal circuit of the amp has some trouble, and the set needs service. OK
Wish You A Happy and Porsperous 2012 Gopakumar G, Trivandrum City, Kerala State, South India.
you can check them with a ohm meter, hook it to the wires that you hook to the reciever and if you get a reading it is good if no reading it is bad wires
Having the speaker wires hooked up backwords will not cause protect mode. If the wires were crossed (in other words shorted), that would. Disconnect all speaker wires, if the unit is still in protect mode, than the output transistors are probably shorted and the unit will again require service. Upon return from service, I would turn on the unit without speakers to insure that the unit at least works that far. Also, if you have an ohmmeter, measure across the speaker terminals. You should read either 3 or 6 ohms. If you read 0, the problem is a shorted speaker that then shorted the amp.
Check the zener diodes over by the fuses, where the 2 chokes or load coils are. TThere are 3 or 4 Of the diodes, they are zener diodes. I had the same problem and found it to be one bad zener diode. Check my solution out on the 7202, same thing.
If the amp still goes into protect mode, the easiest thing to do is disconnect the RCA cables from the amp and see if still goes into protect mode (after turning off/on). If it does, the issue lies in the amp or the wiring to/from the amp (most likely case). Check to make sure no speaker wires came loose and touched +12V or ground (car body). From the sound of it, my guess is something internal to the amp died and will need repair.
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.
Best thing to do is disconnect all the speakers with no input on the amp turn it on and if its still in protection seek help in the repair of said amp at http://performanceteknique.com.. If the protection light goes out then start to put back on each speaker with no volume and the unit off. if you get to a speaker that makes the unit go into protect then leave on that speaker and disconnect all the rest .. If the protect remains then something with that speaker or wiring is bad BUT if after disconnecting the rest of the speakers that you hooked up then theres is still a power issue with your amp
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